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crypto: add an ed25519 digital signature module (#13476)
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vlib/crypto/ed25519/LICENSE
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vlib/crypto/ed25519/LICENSE
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MIT License
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Copyright (c) 2022 blackshirt
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.
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6
vlib/crypto/ed25519/README.md
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vlib/crypto/ed25519/README.md
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README
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-----
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This module implements `ed25519` public key digital signature algorithm for V Language ported </br>
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from `Go` version of `crypto.ed25519`.
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See [Ed25519](http://ed25519.cr.yp.to/) for more detail about `ed25519`.
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181
vlib/crypto/ed25519/ed25519.v
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vlib/crypto/ed25519/ed25519.v
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module ed25519
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import crypto.rand
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import crypto.sha512
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import crypto.internal.subtle
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import crypto.ed25519.internal.edwards25519
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// public_key_size is the sizeof public keys in bytes
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pub const public_key_size = 32
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// private_key_size is the sizeof private keys in bytes
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pub const private_key_size = 64
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// signature_size is the size of signatures generated and verified by this modules, in bytes.
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pub const signature_size = 64
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// seed_size is the size of private key seeds in bytes
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pub const seed_size = 32
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// `PublicKey` is Ed25519 public keys.
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pub type PublicKey = []byte
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// `equal` reports whether p and x have the same value.
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pub fn (p PublicKey) equal(x []byte) bool {
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return subtle.constant_time_compare(p, PublicKey(x)) == 1
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}
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// `PrivateKey` is Ed25519 private keys
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pub type PrivateKey = []byte
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// seed returns the private key seed corresponding to priv. RFC 8032's private keys correspond to seeds
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// in this module.
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pub fn (priv PrivateKey) seed() []byte {
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mut seed := []byte{len: ed25519.seed_size}
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copy(seed, priv[..32])
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return seed
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}
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// `public_key` returns the []byte corresponding to priv.
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pub fn (priv PrivateKey) public_key() []byte {
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assert priv.len == ed25519.private_key_size
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mut publickey := []byte{len: ed25519.public_key_size}
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copy(publickey, priv[32..])
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return PublicKey(publickey)
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}
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// currentyly x not `crypto.PrivateKey`
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pub fn (priv PrivateKey) equal(x []byte) bool {
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return subtle.constant_time_compare(priv, PrivateKey(x)) == 1
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}
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// `sign` signs the given message with priv.
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pub fn (priv PrivateKey) sign(message []byte) ?[]byte {
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/*
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if opts.HashFunc() != crypto.Hash(0) {
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return nil, errors.New("ed25519: cannot sign hashed message")
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}*/
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return sign(priv, message)
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}
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// `sign `signs the message with privatekey and returns a signature
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pub fn sign(privatekey PrivateKey, message []byte) ?[]byte {
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mut signature := []byte{len: ed25519.signature_size}
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sign_generic(signature, privatekey, message) ?
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return signature
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}
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fn sign_generic(signature []byte, privatekey []byte, message []byte) ? {
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if privatekey.len != ed25519.private_key_size {
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panic('ed25519: bad private key length: $privatekey.len')
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}
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seed, publickey := privatekey[..ed25519.seed_size], privatekey[ed25519.seed_size..]
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mut h := sha512.sum512(seed)
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mut s := edwards25519.new_scalar()
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s.set_bytes_with_clamping(h[..32]) ?
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mut prefix := h[32..]
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mut mh := sha512.new()
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mh.write(prefix) ?
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mh.write(message) ?
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mut msg_digest := []byte{cap: sha512.size}
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msg_digest = mh.sum(msg_digest)
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mut r := edwards25519.new_scalar()
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r.set_uniform_bytes(msg_digest) ?
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mut rr := edwards25519.Point{}
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rr.scalar_base_mult(mut r)
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mut kh := sha512.new()
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kh.write(rr.bytes()) ?
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kh.write(publickey) ?
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kh.write(message) ?
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mut hram_digest := []byte{cap: sha512.size}
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hram_digest = kh.sum(hram_digest)
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mut k := edwards25519.new_scalar()
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k.set_uniform_bytes(hram_digest) ?
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mut ss := edwards25519.new_scalar()
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ss.multiply_add(k, s, r)
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copy(signature[..32], rr.bytes())
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copy(signature[32..], ss.bytes())
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}
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// `verify` reports whether sig is a valid signature of message by publickey.
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pub fn verify(publickey PublicKey, message []byte, sig []byte) ?bool {
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if publickey.len != ed25519.public_key_size {
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return error('ed25519: bad public key length: $publickey.len')
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}
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if sig.len != ed25519.signature_size || sig[63] & 224 != 0 {
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return false
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}
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mut aa := edwards25519.Point{}
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aa.set_bytes(publickey) ?
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mut kh := sha512.new()
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kh.write(sig[..32]) ?
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kh.write(publickey) ?
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kh.write(message) ?
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mut hram_digest := []byte{cap: sha512.size}
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hram_digest = kh.sum(hram_digest)
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mut k := edwards25519.new_scalar()
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k.set_uniform_bytes(hram_digest) ?
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mut ss := edwards25519.new_scalar()
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ss.set_canonical_bytes(sig[32..]) ?
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// [S]B = R + [k]A --> [k](-A) + [S]B = R
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mut minus_a := edwards25519.Point{}
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minus_a.negate(aa)
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mut rr := edwards25519.Point{}
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rr.vartime_double_scalar_base_mult(k, minus_a, ss)
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return subtle.constant_time_compare(sig[..32], rr.bytes()) == 1
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}
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// `generate_key` generates a public/private key pair entropy using `crypto.rand`.
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pub fn generate_key() ?(PublicKey, PrivateKey) {
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mut seed := rand.bytes(ed25519.seed_size) ?
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privatekey := new_key_from_seed(seed)
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publickey := []byte{len: ed25519.public_key_size}
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copy(publickey, privatekey[32..])
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return publickey, privatekey
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}
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// `new_key_from_seed` calculates a private key from a seed. private keys of RFC 8032
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// correspond to seeds in this module
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pub fn new_key_from_seed(seed []byte) PrivateKey {
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// Outline the function body so that the returned key can be stack-allocated.
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privatekey := []byte{len: ed25519.private_key_size}
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new_key_from_seed_generic(privatekey, seed)
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return PrivateKey(privatekey)
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}
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fn new_key_from_seed_generic(privatekey []byte, seed []byte) {
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if seed.len != ed25519.seed_size {
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panic('ed25519: bad seed length: $seed.len')
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}
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mut h := sha512.sum512(seed)
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mut s := edwards25519.new_scalar()
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s.set_bytes_with_clamping(h[..32]) or { panic(err.msg) }
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mut aa := edwards25519.Point{}
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aa.scalar_base_mult(mut s)
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mut publickey := aa.bytes()
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copy(privatekey, seed)
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copy(privatekey[32..], publickey)
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}
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41
vlib/crypto/ed25519/examples/example.v
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vlib/crypto/ed25519/examples/example.v
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module main
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import encoding.hex
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import encoding.base64
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import crypto.ed25519
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// adapted from https://asecuritysite.com/signatures/ed25519
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fn main() {
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msg := 'Hello Girl'
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publ, priv := ed25519.generate_key() or { panic(err.msg) }
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m := msg.bytes()
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sig := ed25519.sign(priv, m) or { panic(err.msg) }
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println('=== Message ===')
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println('Msg: $msg \nHash: $m')
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println('=== Public key ===')
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println('Public key (Hex): ${hex.encode(publ)}')
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println(' Public key (Base64): ${base64.encode(publ)}')
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println('=== Private key ===')
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println('Private key: $priv.seed().hex()') // priv[0:32]
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println(' Private key (Base64): ${base64.encode(priv.seed())}') // priv[0:32]
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println(' Private key (Base64) Full key: ${base64.encode(priv)}')
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println(' Private key (Full key in Hex): ${hex.encode(priv)}')
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println('=== signature (R,s) ===')
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println('signature: R=${sig[0..32].hex()} s=${sig[32..64].hex()}')
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println(' signature (Base64)=${base64.encode(sig)}')
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rtn := ed25519.verify(publ, m, sig) or { panic(err.msg) }
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if rtn {
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println('Signature verified :$rtn')
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} else {
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println('signature does not verify :${!rtn}')
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}
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}
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203
vlib/crypto/ed25519/internal/ed25519_test.v
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vlib/crypto/ed25519/internal/ed25519_test.v
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module main
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// NB: this should be in vlib/crypto/ed25519/ed25519_test.v
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// but is currently one folder below, because of a V parser/symbol registration bug.
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// TODO: move this test back to vlib/crypto/ed25519/ed25519_test.v
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import os
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import sync.pool
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import encoding.hex
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import crypto.ed25519
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const vexe = os.getenv('VEXE')
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const vroot = os.dir(vexe)
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const testdata = os.join_path(vroot, 'vlib/crypto/ed25519/testdata')
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const contents = os.read_lines(os.join_path(testdata, 'sign.input')) or { panic(err) }
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/*
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struct ZeroReader {}
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fn (z ZeroReader) read(mut buf []byte) ?int {
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for i, _ in buf {
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buf[i] = 0
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}
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return buf.len
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}
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*/
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fn test_sign_verify() ? {
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// mut zero := ZeroReader{}
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public, private := ed25519.generate_key() ?
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message := 'test message'.bytes()
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sig := ed25519.sign(private, message) ?
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res := ed25519.verify(public, message, sig) or { false }
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assert res == true
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wrongmessage := 'wrong message'.bytes()
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res2 := ed25519.verify(public, wrongmessage, sig) ?
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assert res2 == false
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}
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fn test_equal() ? {
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public, private := ed25519.generate_key() ?
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assert public.equal(public) == true
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// This is not AVAILABLE
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/*
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if !public.Equal(crypto.Signer(private).Public()) {
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t.Errorf("private.Public() is not Equal to public: %q", public)
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}*/
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assert private.equal(private) == true
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otherpub, otherpriv := ed25519.generate_key() ?
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assert public.equal(otherpub) == false
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assert private.equal(otherpriv) == false
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}
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fn test_malleability() ? {
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// https://tools.ietf.org/html/rfc8032#section-5.1.7 adds an additional test
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// that s be in [0, order). This prevents someone from adding a multiple of
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// order to s and obtaining a second valid signature for the same message.
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msg := [byte(0x54), 0x65, 0x73, 0x74]
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sig := [byte(0x7c), 0x38, 0xe0, 0x26, 0xf2, 0x9e, 0x14, 0xaa, 0xbd, 0x05, 0x9a, 0x0f, 0x2d,
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0xb8, 0xb0, 0xcd, 0x78, 0x30, 0x40, 0x60, 0x9a, 0x8b, 0xe6, 0x84, 0xdb, 0x12, 0xf8, 0x2a,
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0x27, 0x77, 0x4a, 0xb0, 0x67, 0x65, 0x4b, 0xce, 0x38, 0x32, 0xc2, 0xd7, 0x6f, 0x8f, 0x6f,
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0x5d, 0xaf, 0xc0, 0x8d, 0x93, 0x39, 0xd4, 0xee, 0xf6, 0x76, 0x57, 0x33, 0x36, 0xa5, 0xc5,
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0x1e, 0xb6, 0xf9, 0x46, 0xb3, 0x1d]
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publickey := [byte(0x7d), 0x4d, 0x0e, 0x7f, 0x61, 0x53, 0xa6, 0x9b, 0x62, 0x42, 0xb5, 0x22,
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0xab, 0xbe, 0xe6, 0x85, 0xfd, 0xa4, 0x42, 0x0f, 0x88, 0x34, 0xb1, 0x08, 0xc3, 0xbd, 0xae,
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0x36, 0x9e, 0xf5, 0x49, 0xfa]
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// verify should fail on provided bytes
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res := ed25519.verify(publickey, msg, sig) or { false }
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assert res == false
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}
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fn works_check_on_sign_input_string(item string) bool {
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// this is core part of the tests sign input
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parts := item.split(':') // []string
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if parts.len != 5 {
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return false
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}
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// assert parts.len == 5
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privbytes := hex.decode(parts[0]) or { panic(err.msg) }
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pubkey := hex.decode(parts[1]) or { panic(err.msg) }
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msg := hex.decode(parts[2]) or { panic(err.msg) }
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mut sig := hex.decode(parts[3]) or { panic(err.msg) }
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if pubkey.len != ed25519.public_key_size {
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return false
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}
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// assert pubkey.len == public_key_size
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sig = sig[..ed25519.signature_size]
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mut priv := []byte{len: ed25519.private_key_size}
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copy(priv[..], privbytes)
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|
copy(priv[32..], pubkey)
|
||||||
|
|
||||||
|
sig2 := ed25519.sign(priv[..], msg) or { panic(err.msg) }
|
||||||
|
if sig != sig2[..] {
|
||||||
|
return false
|
||||||
|
}
|
||||||
|
|
||||||
|
res := ed25519.verify(pubkey, msg, sig2) or { panic(err.msg) }
|
||||||
|
// assert res == true
|
||||||
|
if !res {
|
||||||
|
return false
|
||||||
|
}
|
||||||
|
|
||||||
|
priv2 := ed25519.new_key_from_seed(priv[..32])
|
||||||
|
if ed25519.PrivateKey(priv[..]) != priv2 {
|
||||||
|
return false
|
||||||
|
}
|
||||||
|
|
||||||
|
pubkey2 := priv2.public_key()
|
||||||
|
if pubkey != pubkey2 {
|
||||||
|
return false
|
||||||
|
}
|
||||||
|
|
||||||
|
seed2 := priv2.seed()
|
||||||
|
if priv[0..32] != seed2 {
|
||||||
|
return false
|
||||||
|
}
|
||||||
|
|
||||||
|
return true
|
||||||
|
}
|
||||||
|
|
||||||
|
fn worker_for_string_content(p &pool.PoolProcessor, idx int, worker_id int) &SignResult {
|
||||||
|
item := p.get_item<string>(idx)
|
||||||
|
// println('worker_s worker_id: $worker_id | idx: $idx ')
|
||||||
|
res := works_check_on_sign_input_string(item)
|
||||||
|
mut sr := &SignResult{
|
||||||
|
item: item
|
||||||
|
result: res
|
||||||
|
}
|
||||||
|
return sr
|
||||||
|
}
|
||||||
|
|
||||||
|
struct SignResult {
|
||||||
|
mut:
|
||||||
|
item string
|
||||||
|
result bool
|
||||||
|
}
|
||||||
|
|
||||||
|
// This test read a lot of entries in `testdata/sign.input`
|
||||||
|
// so, maybe need a long time to finish.
|
||||||
|
// be quiet and patient
|
||||||
|
fn test_input_from_djb_ed25519_crypto_sign_input_with_syncpool() ? {
|
||||||
|
// contents := os.read_lines('testdata/sign.input') or { panic(err.msg) } //[]string
|
||||||
|
mut pool_s := pool.new_pool_processor(
|
||||||
|
callback: worker_for_string_content
|
||||||
|
maxjobs: 4
|
||||||
|
)
|
||||||
|
pool_s.work_on_items<string>(contents)
|
||||||
|
for i, x in pool_s.get_results<SignResult>() {
|
||||||
|
// println("i: $i = $x.result")
|
||||||
|
assert x.result == true
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
// same as above, but without sync.pool
|
||||||
|
/*
|
||||||
|
fn test_input_from_djb_ed25519_crypto_sign_input_without_syncpool() ? {
|
||||||
|
// contents := os.read_lines('testdata/sign.input') or { panic(err.msg) } //[]string
|
||||||
|
for i, item in ed25519.contents {
|
||||||
|
parts := item.split(':') // []string
|
||||||
|
// println(parts)
|
||||||
|
/*
|
||||||
|
if parts.len != 5 {
|
||||||
|
lg.fatal('not contains len 5')
|
||||||
|
}*/
|
||||||
|
assert parts.len == 5
|
||||||
|
privbytes := hex.decode(parts[0]) ?
|
||||||
|
pubkey := hex.decode(parts[1]) ?
|
||||||
|
msg := hex.decode(parts[2]) ?
|
||||||
|
mut sig := hex.decode(parts[3]) ?
|
||||||
|
assert pubkey.len == public_key_size
|
||||||
|
|
||||||
|
sig = sig[..signature_size]
|
||||||
|
mut priv := []byte{len: ed25519.private_key_size}
|
||||||
|
copy(priv[..], privbytes)
|
||||||
|
copy(priv[32..], pubkey)
|
||||||
|
|
||||||
|
sig2 := ed25519.sign(priv[..], msg) ?
|
||||||
|
assert sig == sig2[..]
|
||||||
|
|
||||||
|
res := ed25519.verify(pubkey, msg, sig2) ?
|
||||||
|
assert res == true
|
||||||
|
|
||||||
|
priv2 := new_key_from_seed(priv[..32])
|
||||||
|
assert priv[..] == priv2
|
||||||
|
|
||||||
|
pubkey2 := priv2.public_key()
|
||||||
|
assert pubkey == pubkey2
|
||||||
|
|
||||||
|
seed2 := priv2.seed()
|
||||||
|
assert priv[0..32] == seed2
|
||||||
|
}
|
||||||
|
}*/
|
19
vlib/crypto/ed25519/internal/edwards25519/README.md
Normal file
19
vlib/crypto/ed25519/internal/edwards25519/README.md
Normal file
@ -0,0 +1,19 @@
|
|||||||
|
README
|
||||||
|
-------
|
||||||
|
|
||||||
|
This module provides arithmetic primitives operations that are useful to implement
|
||||||
|
cryptographic schemes over curve edwards25519, includes:
|
||||||
|
1. Arithmetic functions for point addition, doubling, negation, scalar multiplication
|
||||||
|
with an arbitrary point, with the base point, etc.
|
||||||
|
2. Arithmetic functions dealing with scalars modulo the prime order L of the base point.
|
||||||
|
|
||||||
|
This modules was port of Golang `edwards25519` library from [edwards25519](https://github.com/FiloSottile/edwards25519) to the V language.
|
||||||
|
|
||||||
|
|
||||||
|
About Edwards25519
|
||||||
|
------------------
|
||||||
|
|
||||||
|
Twisted Edwards curves are a familly of elliptic curves allowing complete addition
|
||||||
|
formulas without any special case and no point at infinity.
|
||||||
|
Curve edwards25519 is based on prime 2^255 - 19 for efficient implementation.
|
||||||
|
Equation and parameters are given in RFC 7748.
|
1
vlib/crypto/ed25519/internal/edwards25519/edwards25519.v
Normal file
1
vlib/crypto/ed25519/internal/edwards25519/edwards25519.v
Normal file
@ -0,0 +1 @@
|
|||||||
|
module edwards25519
|
733
vlib/crypto/ed25519/internal/edwards25519/element.v
Normal file
733
vlib/crypto/ed25519/internal/edwards25519/element.v
Normal file
@ -0,0 +1,733 @@
|
|||||||
|
module edwards25519
|
||||||
|
|
||||||
|
import math.bits
|
||||||
|
import math.unsigned
|
||||||
|
import encoding.binary
|
||||||
|
import crypto.internal.subtle
|
||||||
|
|
||||||
|
// embedded unsigned.Uint128
|
||||||
|
struct Uint128 {
|
||||||
|
unsigned.Uint128
|
||||||
|
}
|
||||||
|
|
||||||
|
// Element represents an element of the edwards25519 GF(2^255-19). Note that this
|
||||||
|
// is not a cryptographically secure group, and should only be used to interact
|
||||||
|
// with edwards25519.Point coordinates.
|
||||||
|
//
|
||||||
|
// This type works similarly to math/big.Int, and all arguments and receivers
|
||||||
|
// are allowed to alias.
|
||||||
|
//
|
||||||
|
// The zero value is a valid zero element.
|
||||||
|
struct Element {
|
||||||
|
mut:
|
||||||
|
// An element t represents the integer
|
||||||
|
// t.l0 + t.l1*2^51 + t.l2*2^102 + t.l3*2^153 + t.l4*2^204
|
||||||
|
//
|
||||||
|
// Between operations, all limbs are expected to be lower than 2^52.
|
||||||
|
l0 u64
|
||||||
|
l1 u64
|
||||||
|
l2 u64
|
||||||
|
l3 u64
|
||||||
|
l4 u64
|
||||||
|
}
|
||||||
|
|
||||||
|
const (
|
||||||
|
mask_low_51_bits = u64((1 << 51) - 1)
|
||||||
|
fe_zero = Element{
|
||||||
|
l0: 0
|
||||||
|
l1: 0
|
||||||
|
l2: 0
|
||||||
|
l3: 0
|
||||||
|
l4: 0
|
||||||
|
}
|
||||||
|
fe_one = Element{
|
||||||
|
l0: 1
|
||||||
|
l1: 0
|
||||||
|
l2: 0
|
||||||
|
l3: 0
|
||||||
|
l4: 0
|
||||||
|
}
|
||||||
|
// sqrt_m1 is 2^((p-1)/4), which squared is equal to -1 by Euler's Criterion.
|
||||||
|
sqrt_m1 = Element{
|
||||||
|
l0: 1718705420411056
|
||||||
|
l1: 234908883556509
|
||||||
|
l2: 2233514472574048
|
||||||
|
l3: 2117202627021982
|
||||||
|
l4: 765476049583133
|
||||||
|
}
|
||||||
|
)
|
||||||
|
|
||||||
|
// mul_64 returns a * b.
|
||||||
|
fn mul_64(a u64, b u64) Uint128 {
|
||||||
|
hi, lo := bits.mul_64(a, b)
|
||||||
|
return Uint128{
|
||||||
|
lo: lo
|
||||||
|
hi: hi
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
// add_mul_64 returns v + a * b.
|
||||||
|
fn add_mul_64(v Uint128, a u64, b u64) Uint128 {
|
||||||
|
mut hi, lo := bits.mul_64(a, b)
|
||||||
|
low, carry := bits.add_64(lo, v.lo, 0)
|
||||||
|
hi, _ = bits.add_64(hi, v.hi, carry)
|
||||||
|
return Uint128{
|
||||||
|
lo: low
|
||||||
|
hi: hi
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
// shift_right_by_51 returns a >> 51. a is assumed to be at most 115 bits.
|
||||||
|
fn shift_right_by_51(a Uint128) u64 {
|
||||||
|
return (a.hi << (64 - 51)) | (a.lo >> 51)
|
||||||
|
}
|
||||||
|
|
||||||
|
fn fe_mul_generic(a Element, b Element) Element {
|
||||||
|
a0 := a.l0
|
||||||
|
a1 := a.l1
|
||||||
|
a2 := a.l2
|
||||||
|
a3 := a.l3
|
||||||
|
a4 := a.l4
|
||||||
|
|
||||||
|
b0 := b.l0
|
||||||
|
b1 := b.l1
|
||||||
|
b2 := b.l2
|
||||||
|
b3 := b.l3
|
||||||
|
b4 := b.l4
|
||||||
|
|
||||||
|
// Limb multiplication works like pen-and-paper columnar multiplication, but
|
||||||
|
// with 51-bit limbs instead of digits.
|
||||||
|
//
|
||||||
|
// a4 a3 a2 a1 a0 x
|
||||||
|
// b4 b3 b2 b1 b0 =
|
||||||
|
// ------------------------
|
||||||
|
// a4b0 a3b0 a2b0 a1b0 a0b0 +
|
||||||
|
// a4b1 a3b1 a2b1 a1b1 a0b1 +
|
||||||
|
// a4b2 a3b2 a2b2 a1b2 a0b2 +
|
||||||
|
// a4b3 a3b3 a2b3 a1b3 a0b3 +
|
||||||
|
// a4b4 a3b4 a2b4 a1b4 a0b4 =
|
||||||
|
// ----------------------------------------------
|
||||||
|
// r8 r7 r6 r5 r4 r3 r2 r1 r0
|
||||||
|
//
|
||||||
|
// We can then use the reduction identity (a * 2²⁵⁵ + b = a * 19 + b) to
|
||||||
|
// reduce the limbs that would overflow 255 bits. r5 * 2²⁵⁵ becomes 19 * r5,
|
||||||
|
// r6 * 2³⁰⁶ becomes 19 * r6 * 2⁵¹, etc.
|
||||||
|
//
|
||||||
|
// Reduction can be carried out simultaneously to multiplication. For
|
||||||
|
// example, we do not compute r5: whenever the result of a multiplication
|
||||||
|
// belongs to r5, like a1b4, we multiply it by 19 and add the result to r0.
|
||||||
|
//
|
||||||
|
// a4b0 a3b0 a2b0 a1b0 a0b0 +
|
||||||
|
// a3b1 a2b1 a1b1 a0b1 19×a4b1 +
|
||||||
|
// a2b2 a1b2 a0b2 19×a4b2 19×a3b2 +
|
||||||
|
// a1b3 a0b3 19×a4b3 19×a3b3 19×a2b3 +
|
||||||
|
// a0b4 19×a4b4 19×a3b4 19×a2b4 19×a1b4 =
|
||||||
|
// --------------------------------------
|
||||||
|
// r4 r3 r2 r1 r0
|
||||||
|
//
|
||||||
|
// Finally we add up the columns into wide, overlapping limbs.
|
||||||
|
|
||||||
|
a1_19 := a1 * 19
|
||||||
|
a2_19 := a2 * 19
|
||||||
|
a3_19 := a3 * 19
|
||||||
|
a4_19 := a4 * 19
|
||||||
|
|
||||||
|
// r0 = a0×b0 + 19×(a1×b4 + a2×b3 + a3×b2 + a4×b1)
|
||||||
|
mut r0 := mul_64(a0, b0)
|
||||||
|
r0 = add_mul_64(r0, a1_19, b4)
|
||||||
|
r0 = add_mul_64(r0, a2_19, b3)
|
||||||
|
r0 = add_mul_64(r0, a3_19, b2)
|
||||||
|
r0 = add_mul_64(r0, a4_19, b1)
|
||||||
|
|
||||||
|
// r1 = a0×b1 + a1×b0 + 19×(a2×b4 + a3×b3 + a4×b2)
|
||||||
|
mut r1 := mul_64(a0, b1)
|
||||||
|
r1 = add_mul_64(r1, a1, b0)
|
||||||
|
r1 = add_mul_64(r1, a2_19, b4)
|
||||||
|
r1 = add_mul_64(r1, a3_19, b3)
|
||||||
|
r1 = add_mul_64(r1, a4_19, b2)
|
||||||
|
|
||||||
|
// r2 = a0×b2 + a1×b1 + a2×b0 + 19×(a3×b4 + a4×b3)
|
||||||
|
mut r2 := mul_64(a0, b2)
|
||||||
|
r2 = add_mul_64(r2, a1, b1)
|
||||||
|
r2 = add_mul_64(r2, a2, b0)
|
||||||
|
r2 = add_mul_64(r2, a3_19, b4)
|
||||||
|
r2 = add_mul_64(r2, a4_19, b3)
|
||||||
|
|
||||||
|
// r3 = a0×b3 + a1×b2 + a2×b1 + a3×b0 + 19×a4×b4
|
||||||
|
mut r3 := mul_64(a0, b3)
|
||||||
|
r3 = add_mul_64(r3, a1, b2)
|
||||||
|
r3 = add_mul_64(r3, a2, b1)
|
||||||
|
r3 = add_mul_64(r3, a3, b0)
|
||||||
|
r3 = add_mul_64(r3, a4_19, b4)
|
||||||
|
|
||||||
|
// r4 = a0×b4 + a1×b3 + a2×b2 + a3×b1 + a4×b0
|
||||||
|
mut r4 := mul_64(a0, b4)
|
||||||
|
r4 = add_mul_64(r4, a1, b3)
|
||||||
|
r4 = add_mul_64(r4, a2, b2)
|
||||||
|
r4 = add_mul_64(r4, a3, b1)
|
||||||
|
r4 = add_mul_64(r4, a4, b0)
|
||||||
|
|
||||||
|
// After the multiplication, we need to reduce (carry) the five coefficients
|
||||||
|
// to obtain a result with limbs that are at most slightly larger than 2⁵¹,
|
||||||
|
// to respect the Element invariant.
|
||||||
|
//
|
||||||
|
// Overall, the reduction works the same as carryPropagate, except with
|
||||||
|
// wider inputs: we take the carry for each coefficient by shifting it right
|
||||||
|
// by 51, and add it to the limb above it. The top carry is multiplied by 19
|
||||||
|
// according to the reduction identity and added to the lowest limb.
|
||||||
|
//
|
||||||
|
// The largest coefficient (r0) will be at most 111 bits, which guarantees
|
||||||
|
// that all carries are at most 111 - 51 = 60 bits, which fits in a u64.
|
||||||
|
//
|
||||||
|
// r0 = a0×b0 + 19×(a1×b4 + a2×b3 + a3×b2 + a4×b1)
|
||||||
|
// r0 < 2⁵²×2⁵² + 19×(2⁵²×2⁵² + 2⁵²×2⁵² + 2⁵²×2⁵² + 2⁵²×2⁵²)
|
||||||
|
// r0 < (1 + 19 × 4) × 2⁵² × 2⁵²
|
||||||
|
// r0 < 2⁷ × 2⁵² × 2⁵²
|
||||||
|
// r0 < 2¹¹¹
|
||||||
|
//
|
||||||
|
// Moreover, the top coefficient (r4) is at most 107 bits, so c4 is at most
|
||||||
|
// 56 bits, and c4 * 19 is at most 61 bits, which again fits in a u64 and
|
||||||
|
// allows us to easily apply the reduction identity.
|
||||||
|
//
|
||||||
|
// r4 = a0×b4 + a1×b3 + a2×b2 + a3×b1 + a4×b0
|
||||||
|
// r4 < 5 × 2⁵² × 2⁵²
|
||||||
|
// r4 < 2¹⁰⁷
|
||||||
|
//
|
||||||
|
|
||||||
|
c0 := shift_right_by_51(r0)
|
||||||
|
c1 := shift_right_by_51(r1)
|
||||||
|
c2 := shift_right_by_51(r2)
|
||||||
|
c3 := shift_right_by_51(r3)
|
||||||
|
c4 := shift_right_by_51(r4)
|
||||||
|
|
||||||
|
rr0 := r0.lo & edwards25519.mask_low_51_bits + c4 * 19
|
||||||
|
rr1 := r1.lo & edwards25519.mask_low_51_bits + c0
|
||||||
|
rr2 := r2.lo & edwards25519.mask_low_51_bits + c1
|
||||||
|
rr3 := r3.lo & edwards25519.mask_low_51_bits + c2
|
||||||
|
rr4 := r4.lo & edwards25519.mask_low_51_bits + c3
|
||||||
|
|
||||||
|
// Now all coefficients fit into 64-bit registers but are still too large to
|
||||||
|
// be passed around as a Element. We therefore do one last carry chain,
|
||||||
|
// where the carries will be small enough to fit in the wiggle room above 2⁵¹.
|
||||||
|
mut v := Element{
|
||||||
|
l0: rr0
|
||||||
|
l1: rr1
|
||||||
|
l2: rr2
|
||||||
|
l3: rr3
|
||||||
|
l4: rr4
|
||||||
|
}
|
||||||
|
// v.carryPropagate()
|
||||||
|
// using `carry_propagate_generic()` instead
|
||||||
|
v = v.carry_propagate_generic()
|
||||||
|
return v
|
||||||
|
}
|
||||||
|
|
||||||
|
// carryPropagate brings the limbs below 52 bits by applying the reduction
|
||||||
|
// identity (a * 2²⁵⁵ + b = a * 19 + b) to the l4 carry.
|
||||||
|
fn (mut v Element) carry_propagate_generic() Element {
|
||||||
|
c0 := v.l0 >> 51
|
||||||
|
c1 := v.l1 >> 51
|
||||||
|
c2 := v.l2 >> 51
|
||||||
|
c3 := v.l3 >> 51
|
||||||
|
c4 := v.l4 >> 51
|
||||||
|
|
||||||
|
v.l0 = v.l0 & edwards25519.mask_low_51_bits + c4 * 19
|
||||||
|
v.l1 = v.l1 & edwards25519.mask_low_51_bits + c0
|
||||||
|
v.l2 = v.l2 & edwards25519.mask_low_51_bits + c1
|
||||||
|
v.l3 = v.l3 & edwards25519.mask_low_51_bits + c2
|
||||||
|
v.l4 = v.l4 & edwards25519.mask_low_51_bits + c3
|
||||||
|
return v
|
||||||
|
}
|
||||||
|
|
||||||
|
fn fe_square_generic(a Element) Element {
|
||||||
|
l0 := a.l0
|
||||||
|
l1 := a.l1
|
||||||
|
l2 := a.l2
|
||||||
|
l3 := a.l3
|
||||||
|
l4 := a.l4
|
||||||
|
|
||||||
|
// Squaring works precisely like multiplication above, but thanks to its
|
||||||
|
// symmetry we get to group a few terms together.
|
||||||
|
//
|
||||||
|
// l4 l3 l2 l1 l0 x
|
||||||
|
// l4 l3 l2 l1 l0 =
|
||||||
|
// ------------------------
|
||||||
|
// l4l0 l3l0 l2l0 l1l0 l0l0 +
|
||||||
|
// l4l1 l3l1 l2l1 l1l1 l0l1 +
|
||||||
|
// l4l2 l3l2 l2l2 l1l2 l0l2 +
|
||||||
|
// l4l3 l3l3 l2l3 l1l3 l0l3 +
|
||||||
|
// l4l4 l3l4 l2l4 l1l4 l0l4 =
|
||||||
|
// ----------------------------------------------
|
||||||
|
// r8 r7 r6 r5 r4 r3 r2 r1 r0
|
||||||
|
//
|
||||||
|
// l4l0 l3l0 l2l0 l1l0 l0l0 +
|
||||||
|
// l3l1 l2l1 l1l1 l0l1 19×l4l1 +
|
||||||
|
// l2l2 l1l2 l0l2 19×l4l2 19×l3l2 +
|
||||||
|
// l1l3 l0l3 19×l4l3 19×l3l3 19×l2l3 +
|
||||||
|
// l0l4 19×l4l4 19×l3l4 19×l2l4 19×l1l4 =
|
||||||
|
// --------------------------------------
|
||||||
|
// r4 r3 r2 r1 r0
|
||||||
|
//
|
||||||
|
// With precomputed 2×, 19×, and 2×19× terms, we can compute each limb with
|
||||||
|
// only three mul_64 and four Add64, instead of five and eight.
|
||||||
|
|
||||||
|
l0_2 := l0 * 2
|
||||||
|
l1_2 := l1 * 2
|
||||||
|
|
||||||
|
l1_38 := l1 * 38
|
||||||
|
l2_38 := l2 * 38
|
||||||
|
l3_38 := l3 * 38
|
||||||
|
|
||||||
|
l3_19 := l3 * 19
|
||||||
|
l4_19 := l4 * 19
|
||||||
|
|
||||||
|
// r0 = l0×l0 + 19×(l1×l4 + l2×l3 + l3×l2 + l4×l1) = l0×l0 + 19×2×(l1×l4 + l2×l3)
|
||||||
|
mut r0 := mul_64(l0, l0)
|
||||||
|
r0 = add_mul_64(r0, l1_38, l4)
|
||||||
|
r0 = add_mul_64(r0, l2_38, l3)
|
||||||
|
|
||||||
|
// r1 = l0×l1 + l1×l0 + 19×(l2×l4 + l3×l3 + l4×l2) = 2×l0×l1 + 19×2×l2×l4 + 19×l3×l3
|
||||||
|
mut r1 := mul_64(l0_2, l1)
|
||||||
|
r1 = add_mul_64(r1, l2_38, l4)
|
||||||
|
r1 = add_mul_64(r1, l3_19, l3)
|
||||||
|
|
||||||
|
// r2 = l0×l2 + l1×l1 + l2×l0 + 19×(l3×l4 + l4×l3) = 2×l0×l2 + l1×l1 + 19×2×l3×l4
|
||||||
|
mut r2 := mul_64(l0_2, l2)
|
||||||
|
r2 = add_mul_64(r2, l1, l1)
|
||||||
|
r2 = add_mul_64(r2, l3_38, l4)
|
||||||
|
|
||||||
|
// r3 = l0×l3 + l1×l2 + l2×l1 + l3×l0 + 19×l4×l4 = 2×l0×l3 + 2×l1×l2 + 19×l4×l4
|
||||||
|
mut r3 := mul_64(l0_2, l3)
|
||||||
|
r3 = add_mul_64(r3, l1_2, l2)
|
||||||
|
r3 = add_mul_64(r3, l4_19, l4)
|
||||||
|
|
||||||
|
// r4 = l0×l4 + l1×l3 + l2×l2 + l3×l1 + l4×l0 = 2×l0×l4 + 2×l1×l3 + l2×l2
|
||||||
|
mut r4 := mul_64(l0_2, l4)
|
||||||
|
r4 = add_mul_64(r4, l1_2, l3)
|
||||||
|
r4 = add_mul_64(r4, l2, l2)
|
||||||
|
|
||||||
|
c0 := shift_right_by_51(r0)
|
||||||
|
c1 := shift_right_by_51(r1)
|
||||||
|
c2 := shift_right_by_51(r2)
|
||||||
|
c3 := shift_right_by_51(r3)
|
||||||
|
c4 := shift_right_by_51(r4)
|
||||||
|
|
||||||
|
rr0 := r0.lo & edwards25519.mask_low_51_bits + c4 * 19
|
||||||
|
rr1 := r1.lo & edwards25519.mask_low_51_bits + c0
|
||||||
|
rr2 := r2.lo & edwards25519.mask_low_51_bits + c1
|
||||||
|
rr3 := r3.lo & edwards25519.mask_low_51_bits + c2
|
||||||
|
rr4 := r4.lo & edwards25519.mask_low_51_bits + c3
|
||||||
|
|
||||||
|
mut v := Element{
|
||||||
|
l0: rr0
|
||||||
|
l1: rr1
|
||||||
|
l2: rr2
|
||||||
|
l3: rr3
|
||||||
|
l4: rr4
|
||||||
|
}
|
||||||
|
v = v.carry_propagate_generic()
|
||||||
|
return v
|
||||||
|
}
|
||||||
|
|
||||||
|
// zero sets v = 0, and returns v.
|
||||||
|
fn (mut v Element) zero() Element {
|
||||||
|
v = edwards25519.fe_zero
|
||||||
|
return v
|
||||||
|
}
|
||||||
|
|
||||||
|
// one sets v = 1, and returns v.
|
||||||
|
fn (mut v Element) one() Element {
|
||||||
|
v = edwards25519.fe_one
|
||||||
|
return v
|
||||||
|
}
|
||||||
|
|
||||||
|
// reduce reduces v modulo 2^255 - 19 and returns it.
|
||||||
|
fn (mut v Element) reduce() Element {
|
||||||
|
v = v.carry_propagate_generic()
|
||||||
|
|
||||||
|
// After the light reduction we now have a edwards25519 element representation
|
||||||
|
// v < 2^255 + 2^13 * 19, but need v < 2^255 - 19.
|
||||||
|
|
||||||
|
// If v >= 2^255 - 19, then v + 19 >= 2^255, which would overflow 2^255 - 1,
|
||||||
|
// generating a carry. That is, c will be 0 if v < 2^255 - 19, and 1 otherwise.
|
||||||
|
mut c := (v.l0 + 19) >> 51
|
||||||
|
c = (v.l1 + c) >> 51
|
||||||
|
c = (v.l2 + c) >> 51
|
||||||
|
c = (v.l3 + c) >> 51
|
||||||
|
c = (v.l4 + c) >> 51
|
||||||
|
|
||||||
|
// If v < 2^255 - 19 and c = 0, this will be a no-op. Otherwise, it's
|
||||||
|
// effectively applying the reduction identity to the carry.
|
||||||
|
v.l0 += 19 * c
|
||||||
|
|
||||||
|
v.l1 += v.l0 >> 51
|
||||||
|
v.l0 = v.l0 & edwards25519.mask_low_51_bits
|
||||||
|
v.l2 += v.l1 >> 51
|
||||||
|
v.l1 = v.l1 & edwards25519.mask_low_51_bits
|
||||||
|
v.l3 += v.l2 >> 51
|
||||||
|
v.l2 = v.l2 & edwards25519.mask_low_51_bits
|
||||||
|
v.l4 += v.l3 >> 51
|
||||||
|
v.l3 = v.l3 & edwards25519.mask_low_51_bits
|
||||||
|
// no additional carry
|
||||||
|
v.l4 = v.l4 & edwards25519.mask_low_51_bits
|
||||||
|
|
||||||
|
return v
|
||||||
|
}
|
||||||
|
|
||||||
|
// Add sets v = a + b, and returns v.
|
||||||
|
fn (mut v Element) add(a Element, b Element) Element {
|
||||||
|
v.l0 = a.l0 + b.l0
|
||||||
|
v.l1 = a.l1 + b.l1
|
||||||
|
v.l2 = a.l2 + b.l2
|
||||||
|
v.l3 = a.l3 + b.l3
|
||||||
|
v.l4 = a.l4 + b.l4
|
||||||
|
// Using the generic implementation here is actually faster than the
|
||||||
|
// assembly. Probably because the body of this function is so simple that
|
||||||
|
// the compiler can figure out better optimizations by inlining the carry
|
||||||
|
// propagation.
|
||||||
|
return v.carry_propagate_generic()
|
||||||
|
}
|
||||||
|
|
||||||
|
// Subtract sets v = a - b, and returns v.
|
||||||
|
fn (mut v Element) subtract(a Element, b Element) Element {
|
||||||
|
// We first add 2 * p, to guarantee the subtraction won't underflow, and
|
||||||
|
// then subtract b (which can be up to 2^255 + 2^13 * 19).
|
||||||
|
v.l0 = (a.l0 + 0xFFFFFFFFFFFDA) - b.l0
|
||||||
|
v.l1 = (a.l1 + 0xFFFFFFFFFFFFE) - b.l1
|
||||||
|
v.l2 = (a.l2 + 0xFFFFFFFFFFFFE) - b.l2
|
||||||
|
v.l3 = (a.l3 + 0xFFFFFFFFFFFFE) - b.l3
|
||||||
|
v.l4 = (a.l4 + 0xFFFFFFFFFFFFE) - b.l4
|
||||||
|
return v.carry_propagate_generic()
|
||||||
|
}
|
||||||
|
|
||||||
|
// `negate` sets v = -a, and returns v.
|
||||||
|
fn (mut v Element) negate(a Element) Element {
|
||||||
|
return v.subtract(edwards25519.fe_zero, a)
|
||||||
|
}
|
||||||
|
|
||||||
|
// invert sets v = 1/z mod p, and returns v.
|
||||||
|
//
|
||||||
|
// If z == 0, invert returns v = 0.
|
||||||
|
fn (mut v Element) invert(z Element) Element {
|
||||||
|
// Inversion is implemented as exponentiation with exponent p − 2. It uses the
|
||||||
|
// same sequence of 255 squarings and 11 multiplications as [Curve25519].
|
||||||
|
mut z2 := Element{}
|
||||||
|
mut z9 := Element{}
|
||||||
|
mut z11 := Element{}
|
||||||
|
mut z2_5_0 := Element{}
|
||||||
|
mut z2_10_0 := Element{}
|
||||||
|
mut z2_20_0 := Element{}
|
||||||
|
mut z2_50_0 := Element{}
|
||||||
|
mut z2_100_0 := Element{}
|
||||||
|
mut t := Element{}
|
||||||
|
|
||||||
|
z2.square(z) // 2
|
||||||
|
t.square(z2) // 4
|
||||||
|
t.square(t) // 8
|
||||||
|
z9.multiply(t, z) // 9
|
||||||
|
z11.multiply(z9, z2) // 11
|
||||||
|
t.square(z11) // 22
|
||||||
|
z2_5_0.multiply(t, z9) // 31 = 2^5 - 2^0
|
||||||
|
|
||||||
|
t.square(z2_5_0) // 2^6 - 2^1
|
||||||
|
for i := 0; i < 4; i++ {
|
||||||
|
t.square(t) // 2^10 - 2^5
|
||||||
|
}
|
||||||
|
z2_10_0.multiply(t, z2_5_0) // 2^10 - 2^0
|
||||||
|
|
||||||
|
t.square(z2_10_0) // 2^11 - 2^1
|
||||||
|
for i := 0; i < 9; i++ {
|
||||||
|
t.square(t) // 2^20 - 2^10
|
||||||
|
}
|
||||||
|
z2_20_0.multiply(t, z2_10_0) // 2^20 - 2^0
|
||||||
|
|
||||||
|
t.square(z2_20_0) // 2^21 - 2^1
|
||||||
|
for i := 0; i < 19; i++ {
|
||||||
|
t.square(t) // 2^40 - 2^20
|
||||||
|
}
|
||||||
|
t.multiply(t, z2_20_0) // 2^40 - 2^0
|
||||||
|
|
||||||
|
t.square(t) // 2^41 - 2^1
|
||||||
|
for i := 0; i < 9; i++ {
|
||||||
|
t.square(t) // 2^50 - 2^10
|
||||||
|
}
|
||||||
|
z2_50_0.multiply(t, z2_10_0) // 2^50 - 2^0
|
||||||
|
|
||||||
|
t.square(z2_50_0) // 2^51 - 2^1
|
||||||
|
for i := 0; i < 49; i++ {
|
||||||
|
t.square(t) // 2^100 - 2^50
|
||||||
|
}
|
||||||
|
z2_100_0.multiply(t, z2_50_0) // 2^100 - 2^0
|
||||||
|
|
||||||
|
t.square(z2_100_0) // 2^101 - 2^1
|
||||||
|
for i := 0; i < 99; i++ {
|
||||||
|
t.square(t) // 2^200 - 2^100
|
||||||
|
}
|
||||||
|
t.multiply(t, z2_100_0) // 2^200 - 2^0
|
||||||
|
|
||||||
|
t.square(t) // 2^201 - 2^1
|
||||||
|
for i := 0; i < 49; i++ {
|
||||||
|
t.square(t) // 2^250 - 2^50
|
||||||
|
}
|
||||||
|
t.multiply(t, z2_50_0) // 2^250 - 2^0
|
||||||
|
|
||||||
|
t.square(t) // 2^251 - 2^1
|
||||||
|
t.square(t) // 2^252 - 2^2
|
||||||
|
t.square(t) // 2^253 - 2^3
|
||||||
|
t.square(t) // 2^254 - 2^4
|
||||||
|
t.square(t) // 2^255 - 2^5
|
||||||
|
|
||||||
|
return v.multiply(t, z11) // 2^255 - 21
|
||||||
|
}
|
||||||
|
|
||||||
|
// square sets v = x * x, and returns v.
|
||||||
|
fn (mut v Element) square(x Element) Element {
|
||||||
|
v = fe_square_generic(x)
|
||||||
|
return v
|
||||||
|
}
|
||||||
|
|
||||||
|
// multiply sets v = x * y, and returns v.
|
||||||
|
fn (mut v Element) multiply(x Element, y Element) Element {
|
||||||
|
v = fe_mul_generic(x, y)
|
||||||
|
return v
|
||||||
|
}
|
||||||
|
|
||||||
|
// mul_51 returns lo + hi * 2⁵¹ = a * b.
|
||||||
|
fn mul_51(a u64, b u32) (u64, u64) {
|
||||||
|
mh, ml := bits.mul_64(a, u64(b))
|
||||||
|
lo := ml & edwards25519.mask_low_51_bits
|
||||||
|
hi := (mh << 13) | (ml >> 51)
|
||||||
|
return lo, hi
|
||||||
|
}
|
||||||
|
|
||||||
|
// pow_22523 set v = x^((p-5)/8), and returns v. (p-5)/8 is 2^252-3.
|
||||||
|
fn (mut v Element) pow_22523(x Element) Element {
|
||||||
|
mut t0, mut t1, mut t2 := Element{}, Element{}, Element{}
|
||||||
|
|
||||||
|
t0.square(x) // x^2
|
||||||
|
t1.square(t0) // x^4
|
||||||
|
t1.square(t1) // x^8
|
||||||
|
t1.multiply(x, t1) // x^9
|
||||||
|
t0.multiply(t0, t1) // x^11
|
||||||
|
t0.square(t0) // x^22
|
||||||
|
t0.multiply(t1, t0) // x^31
|
||||||
|
t1.square(t0) // x^62
|
||||||
|
for i := 1; i < 5; i++ { // x^992
|
||||||
|
t1.square(t1)
|
||||||
|
}
|
||||||
|
t0.multiply(t1, t0) // x^1023 -> 1023 = 2^10 - 1
|
||||||
|
t1.square(t0) // 2^11 - 2
|
||||||
|
for i := 1; i < 10; i++ { // 2^20 - 2^10
|
||||||
|
t1.square(t1)
|
||||||
|
}
|
||||||
|
t1.multiply(t1, t0) // 2^20 - 1
|
||||||
|
t2.square(t1) // 2^21 - 2
|
||||||
|
for i := 1; i < 20; i++ { // 2^40 - 2^20
|
||||||
|
t2.square(t2)
|
||||||
|
}
|
||||||
|
t1.multiply(t2, t1) // 2^40 - 1
|
||||||
|
t1.square(t1) // 2^41 - 2
|
||||||
|
for i := 1; i < 10; i++ { // 2^50 - 2^10
|
||||||
|
t1.square(t1)
|
||||||
|
}
|
||||||
|
t0.multiply(t1, t0) // 2^50 - 1
|
||||||
|
t1.square(t0) // 2^51 - 2
|
||||||
|
for i := 1; i < 50; i++ { // 2^100 - 2^50
|
||||||
|
t1.square(t1)
|
||||||
|
}
|
||||||
|
t1.multiply(t1, t0) // 2^100 - 1
|
||||||
|
t2.square(t1) // 2^101 - 2
|
||||||
|
for i := 1; i < 100; i++ { // 2^200 - 2^100
|
||||||
|
t2.square(t2)
|
||||||
|
}
|
||||||
|
t1.multiply(t2, &t1) // 2^200 - 1
|
||||||
|
t1.square(t1) // 2^201 - 2
|
||||||
|
for i := 1; i < 50; i++ { // 2^250 - 2^50
|
||||||
|
t1.square(t1)
|
||||||
|
}
|
||||||
|
t0.multiply(t1, t0) // 2^250 - 1
|
||||||
|
t0.square(t0) // 2^251 - 2
|
||||||
|
t0.square(t0) // 2^252 - 4
|
||||||
|
return v.multiply(t0, x) // 2^252 - 3 -> x^(2^252-3)
|
||||||
|
}
|
||||||
|
|
||||||
|
// sqrt_ratio sets r to the non-negative square root of the ratio of u and v.
|
||||||
|
//
|
||||||
|
// If u/v is square, sqrt_ratio returns r and 1. If u/v is not square, sqrt_ratio
|
||||||
|
// sets r according to Section 4.3 of draft-irtf-cfrg-ristretto255-decaf448-00,
|
||||||
|
// and returns r and 0.
|
||||||
|
fn (mut r Element) sqrt_ratio(u Element, v Element) (Element, int) {
|
||||||
|
mut a, mut b := Element{}, Element{}
|
||||||
|
|
||||||
|
// r = (u * v3) * (u * v7)^((p-5)/8)
|
||||||
|
v2 := a.square(v)
|
||||||
|
uv3 := b.multiply(u, b.multiply(v2, v))
|
||||||
|
uv7 := a.multiply(uv3, a.square(v2))
|
||||||
|
r.multiply(uv3, r.pow_22523(uv7))
|
||||||
|
|
||||||
|
mut check := a.multiply(v, a.square(r)) // check = v * r^2
|
||||||
|
|
||||||
|
mut uneg := b.negate(u)
|
||||||
|
correct_sign_sqrt := check.equal(u)
|
||||||
|
flipped_sign_sqrt := check.equal(uneg)
|
||||||
|
flipped_sign_sqrt_i := check.equal(uneg.multiply(uneg, edwards25519.sqrt_m1))
|
||||||
|
|
||||||
|
rprime := b.multiply(r, edwards25519.sqrt_m1) // r_prime = SQRT_M1 * r
|
||||||
|
// r = CT_selected(r_prime IF flipped_sign_sqrt | flipped_sign_sqrt_i ELSE r)
|
||||||
|
r.selected(rprime, r, flipped_sign_sqrt | flipped_sign_sqrt_i)
|
||||||
|
|
||||||
|
r.absolute(r) // Choose the nonnegative square root.
|
||||||
|
return r, correct_sign_sqrt | flipped_sign_sqrt
|
||||||
|
}
|
||||||
|
|
||||||
|
// mask_64_bits returns 0xffffffff if cond is 1, and 0 otherwise.
|
||||||
|
fn mask_64_bits(cond int) u64 {
|
||||||
|
// in go, `^` operates on bit mean NOT, flip bit
|
||||||
|
// in v, its a ~ bitwise NOT
|
||||||
|
return ~(u64(cond) - 1)
|
||||||
|
}
|
||||||
|
|
||||||
|
// selected sets v to a if cond == 1, and to b if cond == 0.
|
||||||
|
fn (mut v Element) selected(a Element, b Element, cond int) Element {
|
||||||
|
// see above notes
|
||||||
|
m := mask_64_bits(cond)
|
||||||
|
v.l0 = (m & a.l0) | (~m & b.l0)
|
||||||
|
v.l1 = (m & a.l1) | (~m & b.l1)
|
||||||
|
v.l2 = (m & a.l2) | (~m & b.l2)
|
||||||
|
v.l3 = (m & a.l3) | (~m & b.l3)
|
||||||
|
v.l4 = (m & a.l4) | (~m & b.l4)
|
||||||
|
return v
|
||||||
|
}
|
||||||
|
|
||||||
|
// is_negative returns 1 if v is negative, and 0 otherwise.
|
||||||
|
fn (mut v Element) is_negative() int {
|
||||||
|
return int(v.bytes()[0] & 1)
|
||||||
|
}
|
||||||
|
|
||||||
|
// absolute sets v to |u|, and returns v.
|
||||||
|
fn (mut v Element) absolute(u Element) Element {
|
||||||
|
mut e := Element{}
|
||||||
|
mut uk := u
|
||||||
|
return v.selected(e.negate(uk), uk, uk.is_negative())
|
||||||
|
}
|
||||||
|
|
||||||
|
// set sets v = a, and returns v.
|
||||||
|
fn (mut v Element) set(a Element) Element {
|
||||||
|
v = a
|
||||||
|
return v
|
||||||
|
}
|
||||||
|
|
||||||
|
// set_bytes sets v to x, where x is a 32-byte little-endian encoding. If x is
|
||||||
|
// not of the right length, SetUniformBytes returns nil and an error, and the
|
||||||
|
// receiver is unchanged.
|
||||||
|
//
|
||||||
|
// Consistent with RFC 7748, the most significant bit (the high bit of the
|
||||||
|
// last byte) is ignored, and non-canonical values (2^255-19 through 2^255-1)
|
||||||
|
// are accepted. Note that this is laxer than specified by RFC 8032.
|
||||||
|
fn (mut v Element) set_bytes(x []byte) ?Element {
|
||||||
|
if x.len != 32 {
|
||||||
|
return error('edwards25519: invalid edwards25519 element input size')
|
||||||
|
}
|
||||||
|
|
||||||
|
// Bits 0:51 (bytes 0:8, bits 0:64, shift 0, mask 51).
|
||||||
|
v.l0 = binary.little_endian_u64(x[0..8])
|
||||||
|
v.l0 &= edwards25519.mask_low_51_bits
|
||||||
|
// Bits 51:102 (bytes 6:14, bits 48:112, shift 3, mask 51).
|
||||||
|
v.l1 = binary.little_endian_u64(x[6..14]) >> 3
|
||||||
|
v.l1 &= edwards25519.mask_low_51_bits
|
||||||
|
// Bits 102:153 (bytes 12:20, bits 96:160, shift 6, mask 51).
|
||||||
|
v.l2 = binary.little_endian_u64(x[12..20]) >> 6
|
||||||
|
v.l2 &= edwards25519.mask_low_51_bits
|
||||||
|
// Bits 153:204 (bytes 19:27, bits 152:216, shift 1, mask 51).
|
||||||
|
v.l3 = binary.little_endian_u64(x[19..27]) >> 1
|
||||||
|
v.l3 &= edwards25519.mask_low_51_bits
|
||||||
|
// Bits 204:251 (bytes 24:32, bits 192:256, shift 12, mask 51).
|
||||||
|
// Note: not bytes 25:33, shift 4, to avoid overread.
|
||||||
|
v.l4 = binary.little_endian_u64(x[24..32]) >> 12
|
||||||
|
v.l4 &= edwards25519.mask_low_51_bits
|
||||||
|
|
||||||
|
return v
|
||||||
|
}
|
||||||
|
|
||||||
|
// bytes returns the canonical 32-byte little-endian encoding of v.
|
||||||
|
pub fn (mut v Element) bytes() []byte {
|
||||||
|
// This function is outlined to make the allocations inline in the caller
|
||||||
|
// rather than happen on the heap.
|
||||||
|
// out := v.bytes_generic()
|
||||||
|
return v.bytes_generic()
|
||||||
|
}
|
||||||
|
|
||||||
|
fn (mut v Element) bytes_generic() []byte {
|
||||||
|
mut out := []byte{len: 32}
|
||||||
|
|
||||||
|
v = v.reduce()
|
||||||
|
|
||||||
|
mut buf := []byte{len: 8}
|
||||||
|
idxs := [v.l0, v.l1, v.l2, v.l3, v.l4]
|
||||||
|
for i, l in idxs {
|
||||||
|
bits_offset := i * 51
|
||||||
|
binary.little_endian_put_u64(mut buf, l << u32(bits_offset % 8))
|
||||||
|
for j, bb in buf {
|
||||||
|
off := bits_offset / 8 + j
|
||||||
|
if off >= out.len {
|
||||||
|
break
|
||||||
|
}
|
||||||
|
out[off] |= bb
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
return out
|
||||||
|
}
|
||||||
|
|
||||||
|
// equal returns 1 if v and u are equal, and 0 otherwise.
|
||||||
|
fn (mut v Element) equal(ue Element) int {
|
||||||
|
mut u := ue
|
||||||
|
sa := u.bytes()
|
||||||
|
sv := v.bytes()
|
||||||
|
return subtle.constant_time_compare(sa, sv)
|
||||||
|
}
|
||||||
|
|
||||||
|
// swap swaps v and u if cond == 1 or leaves them unchanged if cond == 0, and returns v.
|
||||||
|
fn (mut v Element) swap(mut u Element, cond int) {
|
||||||
|
// mut u := ue
|
||||||
|
m := mask_64_bits(cond)
|
||||||
|
mut t := m & (v.l0 ^ u.l0)
|
||||||
|
v.l0 ^= t
|
||||||
|
u.l0 ^= t
|
||||||
|
t = m & (v.l1 ^ u.l1)
|
||||||
|
v.l1 ^= t
|
||||||
|
u.l1 ^= t
|
||||||
|
t = m & (v.l2 ^ u.l2)
|
||||||
|
v.l2 ^= t
|
||||||
|
u.l2 ^= t
|
||||||
|
t = m & (v.l3 ^ u.l3)
|
||||||
|
v.l3 ^= t
|
||||||
|
u.l3 ^= t
|
||||||
|
t = m & (v.l4 ^ u.l4)
|
||||||
|
v.l4 ^= t
|
||||||
|
u.l4 ^= t
|
||||||
|
}
|
||||||
|
|
||||||
|
// mult_32 sets v = x * y, and returns v.
|
||||||
|
fn (mut v Element) mult_32(x Element, y u32) Element {
|
||||||
|
x0lo, x0hi := mul_51(x.l0, y)
|
||||||
|
x1lo, x1hi := mul_51(x.l1, y)
|
||||||
|
x2lo, x2hi := mul_51(x.l2, y)
|
||||||
|
x3lo, x3hi := mul_51(x.l3, y)
|
||||||
|
x4lo, x4hi := mul_51(x.l4, y)
|
||||||
|
v.l0 = x0lo + 19 * x4hi // carried over per the reduction identity
|
||||||
|
v.l1 = x1lo + x0hi
|
||||||
|
v.l2 = x2lo + x1hi
|
||||||
|
v.l3 = x3lo + x2hi
|
||||||
|
v.l4 = x4lo + x3hi
|
||||||
|
// The hi portions are going to be only 32 bits, plus any previous excess,
|
||||||
|
// so we can skip the carry propagation.
|
||||||
|
return v
|
||||||
|
}
|
||||||
|
|
||||||
|
fn swap_endianness(mut buf []byte) []byte {
|
||||||
|
for i := 0; i < buf.len / 2; i++ {
|
||||||
|
buf[i], buf[buf.len - i - 1] = buf[buf.len - i - 1], buf[i]
|
||||||
|
}
|
||||||
|
return buf
|
||||||
|
}
|
464
vlib/crypto/ed25519/internal/edwards25519/element_test.v
Normal file
464
vlib/crypto/ed25519/internal/edwards25519/element_test.v
Normal file
@ -0,0 +1,464 @@
|
|||||||
|
module edwards25519
|
||||||
|
|
||||||
|
import os
|
||||||
|
import rand
|
||||||
|
import math.bits
|
||||||
|
import math.big
|
||||||
|
import encoding.hex
|
||||||
|
|
||||||
|
const github_job = os.getenv('GITHUB_JOB')
|
||||||
|
|
||||||
|
fn testsuite_begin() {
|
||||||
|
if edwards25519.github_job != '' {
|
||||||
|
// ensure that the CI does not run flaky tests:
|
||||||
|
rand.seed([u32(0xffff24), 0xabcd])
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
fn (mut v Element) str() string {
|
||||||
|
return hex.encode(v.bytes())
|
||||||
|
}
|
||||||
|
|
||||||
|
const mask_low_52_bits = (u64(1) << 52) - 1
|
||||||
|
|
||||||
|
fn generate_field_element() Element {
|
||||||
|
return Element{
|
||||||
|
l0: rand.u64() & edwards25519.mask_low_52_bits
|
||||||
|
l1: rand.u64() & edwards25519.mask_low_52_bits
|
||||||
|
l2: rand.u64() & edwards25519.mask_low_52_bits
|
||||||
|
l3: rand.u64() & edwards25519.mask_low_52_bits
|
||||||
|
l4: rand.u64() & edwards25519.mask_low_52_bits
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
// weirdLimbs can be combined to generate a range of edge-case edwards25519 elements.
|
||||||
|
// 0 and -1 are intentionally more weighted, as they combine well.
|
||||||
|
const (
|
||||||
|
two_to_51 = u64(1) << 51
|
||||||
|
two_to_52 = u64(1) << 52
|
||||||
|
weird_limbs_51 = [
|
||||||
|
u64(0),
|
||||||
|
0,
|
||||||
|
0,
|
||||||
|
0,
|
||||||
|
1,
|
||||||
|
19 - 1,
|
||||||
|
19,
|
||||||
|
0x2aaaaaaaaaaaa,
|
||||||
|
0x5555555555555,
|
||||||
|
two_to_51 - 20,
|
||||||
|
two_to_51 - 19,
|
||||||
|
two_to_51 - 1,
|
||||||
|
two_to_51 - 1,
|
||||||
|
two_to_51 - 1,
|
||||||
|
two_to_51 - 1,
|
||||||
|
]
|
||||||
|
weird_limbs_52 = [
|
||||||
|
u64(0),
|
||||||
|
0,
|
||||||
|
0,
|
||||||
|
0,
|
||||||
|
0,
|
||||||
|
0,
|
||||||
|
1,
|
||||||
|
19 - 1,
|
||||||
|
19,
|
||||||
|
0x2aaaaaaaaaaaa,
|
||||||
|
0x5555555555555,
|
||||||
|
two_to_51 - 20,
|
||||||
|
two_to_51 - 19,
|
||||||
|
two_to_51 - 1,
|
||||||
|
two_to_51 - 1,
|
||||||
|
two_to_51 - 1,
|
||||||
|
two_to_51 - 1,
|
||||||
|
two_to_51 - 1,
|
||||||
|
two_to_51 - 1,
|
||||||
|
two_to_51,
|
||||||
|
two_to_51 + 1,
|
||||||
|
two_to_52 - 19,
|
||||||
|
two_to_52 - 1,
|
||||||
|
]
|
||||||
|
)
|
||||||
|
|
||||||
|
fn generate_weird_field_element() Element {
|
||||||
|
return Element{
|
||||||
|
l0: edwards25519.weird_limbs_52[rand.intn(edwards25519.weird_limbs_52.len)]
|
||||||
|
l1: edwards25519.weird_limbs_51[rand.intn(edwards25519.weird_limbs_51.len)]
|
||||||
|
l2: edwards25519.weird_limbs_51[rand.intn(edwards25519.weird_limbs_51.len)]
|
||||||
|
l3: edwards25519.weird_limbs_51[rand.intn(edwards25519.weird_limbs_51.len)]
|
||||||
|
l4: edwards25519.weird_limbs_51[rand.intn(edwards25519.weird_limbs_51.len)]
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
fn (e Element) generate_element() Element {
|
||||||
|
if rand.intn(2) == 0 {
|
||||||
|
return generate_weird_field_element()
|
||||||
|
}
|
||||||
|
return generate_field_element()
|
||||||
|
}
|
||||||
|
|
||||||
|
fn is_in_bounds(x Element) bool {
|
||||||
|
return bits.len_64(x.l0) <= 52 && bits.len_64(x.l1) <= 52 && bits.len_64(x.l2) <= 52
|
||||||
|
&& bits.len_64(x.l3) <= 52 && bits.len_64(x.l4) <= 52
|
||||||
|
}
|
||||||
|
|
||||||
|
fn carry_gen(a [5]u64) bool {
|
||||||
|
mut t1 := Element{a[0], a[1], a[2], a[3], a[4]}
|
||||||
|
mut t2 := Element{a[0], a[1], a[2], a[3], a[4]}
|
||||||
|
|
||||||
|
t1.carry_propagate_generic()
|
||||||
|
t2.carry_propagate_generic()
|
||||||
|
|
||||||
|
return t1 == t2 && is_in_bounds(t2)
|
||||||
|
}
|
||||||
|
|
||||||
|
fn test_carry_propagate_generic() {
|
||||||
|
// closures not supported on windows
|
||||||
|
for i := 0; i <= 10; i++ {
|
||||||
|
els := [rand.u64(), rand.u64(), rand.u64(), rand.u64(),
|
||||||
|
rand.u64()]!
|
||||||
|
p := carry_gen(els)
|
||||||
|
assert p == true
|
||||||
|
}
|
||||||
|
res := carry_gen([u64(0xffffffffffffffff), 0xffffffffffffffff, 0xffffffffffffffff,
|
||||||
|
0xffffffffffffffff, 0xffffffffffffffff]!)
|
||||||
|
assert res == true
|
||||||
|
}
|
||||||
|
|
||||||
|
fn test_fe_mul_generic() {
|
||||||
|
for i in 0 .. 20 {
|
||||||
|
el := Element{}
|
||||||
|
a := el.generate_element()
|
||||||
|
b := el.generate_element()
|
||||||
|
a1 := a
|
||||||
|
a2 := a
|
||||||
|
|
||||||
|
b1 := b
|
||||||
|
b2 := b
|
||||||
|
|
||||||
|
a1b1 := fe_mul_generic(a1, b1)
|
||||||
|
a2b2 := fe_mul_generic(a2, b2)
|
||||||
|
assert a1b1 == a2b2 && is_in_bounds(a1b1) && is_in_bounds(a2b2)
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
fn test_fe_square_generic() {
|
||||||
|
for i in 0 .. 20 {
|
||||||
|
a := generate_field_element()
|
||||||
|
|
||||||
|
a1 := a
|
||||||
|
a2 := a
|
||||||
|
|
||||||
|
a11 := fe_square_generic(a1)
|
||||||
|
a22 := fe_square_generic(a2)
|
||||||
|
assert a11 == a22 && is_in_bounds(a11) && is_in_bounds(a22)
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
struct SqrtRatioTest {
|
||||||
|
u string
|
||||||
|
v string
|
||||||
|
was_square int
|
||||||
|
r string
|
||||||
|
}
|
||||||
|
|
||||||
|
fn test_sqrt_ratio() ? {
|
||||||
|
// From draft-irtf-cfrg-ristretto255-decaf448-00, Appendix A.4.
|
||||||
|
|
||||||
|
tests := [
|
||||||
|
// If u is 0, the function is defined to return (0, TRUE), even if v
|
||||||
|
// is zero. Note that where used in this package, the denominator v
|
||||||
|
// is never zero.
|
||||||
|
SqrtRatioTest{'0000000000000000000000000000000000000000000000000000000000000000', '0000000000000000000000000000000000000000000000000000000000000000', 1, '0000000000000000000000000000000000000000000000000000000000000000'},
|
||||||
|
// 0/1 == 0²
|
||||||
|
SqrtRatioTest{'0000000000000000000000000000000000000000000000000000000000000000', '0100000000000000000000000000000000000000000000000000000000000000', 1, '0000000000000000000000000000000000000000000000000000000000000000'},
|
||||||
|
// If u is non-zero and v is zero, defined to return (0, FALSE).
|
||||||
|
SqrtRatioTest{'0100000000000000000000000000000000000000000000000000000000000000', '0000000000000000000000000000000000000000000000000000000000000000', 0, '0000000000000000000000000000000000000000000000000000000000000000'},
|
||||||
|
// 2/1 is not square in this edwards25519.
|
||||||
|
SqrtRatioTest{'0200000000000000000000000000000000000000000000000000000000000000', '0100000000000000000000000000000000000000000000000000000000000000', 0, '3c5ff1b5d8e4113b871bd052f9e7bcd0582804c266ffb2d4f4203eb07fdb7c54'},
|
||||||
|
// 4/1 == 2²
|
||||||
|
SqrtRatioTest{'0400000000000000000000000000000000000000000000000000000000000000', '0100000000000000000000000000000000000000000000000000000000000000', 1, '0200000000000000000000000000000000000000000000000000000000000000'},
|
||||||
|
// 1/4 == (2⁻¹)² == (2^(p-2))² per Euler's theorem
|
||||||
|
SqrtRatioTest{'0100000000000000000000000000000000000000000000000000000000000000', '0400000000000000000000000000000000000000000000000000000000000000', 1, 'f6ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff3f'},
|
||||||
|
]
|
||||||
|
|
||||||
|
for i, tt in tests {
|
||||||
|
mut elu := Element{}
|
||||||
|
mut elv := Element{}
|
||||||
|
mut elw := Element{}
|
||||||
|
mut elg := Element{}
|
||||||
|
|
||||||
|
u := elu.set_bytes(hex.decode(tt.u) ?) ?
|
||||||
|
v := elv.set_bytes(hex.decode(tt.v) ?) ?
|
||||||
|
want := elw.set_bytes(hex.decode(tt.r) ?) ?
|
||||||
|
mut got, was_square := elg.sqrt_ratio(u, v)
|
||||||
|
|
||||||
|
assert got.equal(want) != 0
|
||||||
|
assert was_square == tt.was_square
|
||||||
|
// if got.Equal(want) == 0 || wasSquare != tt.wasSquare {
|
||||||
|
// t.Errorf("%d: got (%v, %v), want (%v, %v)", i, got, wasSquare, want, tt.wasSquare)
|
||||||
|
// }
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
fn test_set_bytes_normal() ? {
|
||||||
|
for i in 0 .. 15 {
|
||||||
|
mut el := Element{}
|
||||||
|
mut random_inp := rand.bytes(32) ?
|
||||||
|
|
||||||
|
el = el.set_bytes(random_inp.clone()) ?
|
||||||
|
random_inp[random_inp.len - 1] &= (1 << 7) - 1
|
||||||
|
// assert f1(random_inp, el) == true
|
||||||
|
|
||||||
|
assert random_inp == el.bytes()
|
||||||
|
assert is_in_bounds(el) == true
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
fn test_set_bytes_reduced() {
|
||||||
|
mut fe := Element{}
|
||||||
|
mut r := Element{}
|
||||||
|
mut random_inp := rand.bytes(32) or { return }
|
||||||
|
|
||||||
|
fe.set_bytes(random_inp) or { return }
|
||||||
|
r.set_bytes(fe.bytes()) or { return }
|
||||||
|
|
||||||
|
assert fe == r
|
||||||
|
}
|
||||||
|
|
||||||
|
// Check some fixed vectors from dalek
|
||||||
|
struct FeRTTest {
|
||||||
|
mut:
|
||||||
|
fe Element
|
||||||
|
b []byte
|
||||||
|
}
|
||||||
|
|
||||||
|
fn test_set_bytes_from_dalek_test_vectors() ? {
|
||||||
|
mut tests := [
|
||||||
|
FeRTTest{
|
||||||
|
fe: Element{358744748052810, 1691584618240980, 977650209285361, 1429865912637724, 560044844278676}
|
||||||
|
b: [byte(74), 209, 69, 197, 70, 70, 161, 222, 56, 226, 229, 19, 112, 60, 25, 92, 187,
|
||||||
|
74, 222, 56, 50, 153, 51, 233, 40, 74, 57, 6, 160, 185, 213, 31]
|
||||||
|
},
|
||||||
|
FeRTTest{
|
||||||
|
fe: Element{84926274344903, 473620666599931, 365590438845504, 1028470286882429, 2146499180330972}
|
||||||
|
b: [byte(199), 23, 106, 112, 61, 77, 216, 79, 186, 60, 11, 118, 13, 16, 103, 15, 42,
|
||||||
|
32, 83, 250, 44, 57, 204, 198, 78, 199, 253, 119, 146, 172, 3, 122]
|
||||||
|
},
|
||||||
|
]
|
||||||
|
for _, mut tt in tests {
|
||||||
|
b := tt.fe.bytes()
|
||||||
|
mut el := Element{}
|
||||||
|
mut fe := el.set_bytes(tt.b) ?
|
||||||
|
|
||||||
|
assert b == tt.b
|
||||||
|
assert fe.equal(tt.fe) == 1
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
fn test_equal() {
|
||||||
|
mut x := Element{1, 1, 1, 1, 1}
|
||||||
|
y := Element{5, 4, 3, 2, 1}
|
||||||
|
|
||||||
|
mut eq1 := x.equal(x)
|
||||||
|
assert eq1 == 1
|
||||||
|
|
||||||
|
eq1 = x.equal(y)
|
||||||
|
assert eq1 == 0
|
||||||
|
}
|
||||||
|
|
||||||
|
fn test_invert() ? {
|
||||||
|
mut x := Element{1, 1, 1, 1, 1}
|
||||||
|
mut one := Element{1, 0, 0, 0, 0}
|
||||||
|
mut xinv := Element{}
|
||||||
|
mut r := Element{}
|
||||||
|
|
||||||
|
xinv.invert(x)
|
||||||
|
r.multiply(x, xinv)
|
||||||
|
r.reduce()
|
||||||
|
|
||||||
|
assert one == r
|
||||||
|
bytes := rand.bytes(32) or { return err }
|
||||||
|
|
||||||
|
x.set_bytes(bytes) ?
|
||||||
|
|
||||||
|
xinv.invert(x)
|
||||||
|
r.multiply(x, xinv)
|
||||||
|
r.reduce()
|
||||||
|
|
||||||
|
assert one == r
|
||||||
|
|
||||||
|
zero := Element{}
|
||||||
|
x.set(zero)
|
||||||
|
|
||||||
|
xx := xinv.invert(x)
|
||||||
|
assert xx == xinv
|
||||||
|
assert xinv.equal(zero) == 1
|
||||||
|
// s := if num % 2 == 0 { 'even' } else { 'odd' }
|
||||||
|
}
|
||||||
|
|
||||||
|
fn test_mult_32() {
|
||||||
|
for j in 0 .. 10 {
|
||||||
|
mut x := Element{}
|
||||||
|
mut t1 := Element{}
|
||||||
|
y := u32(0)
|
||||||
|
for i := 0; i < 100; i++ {
|
||||||
|
t1.mult_32(x, y)
|
||||||
|
}
|
||||||
|
mut ty := Element{}
|
||||||
|
ty.l0 = u64(y)
|
||||||
|
mut t2 := Element{}
|
||||||
|
for i := 0; i < 100; i++ {
|
||||||
|
t2.multiply(x, ty)
|
||||||
|
}
|
||||||
|
assert t1.equal(t2) == 1 && is_in_bounds(t1) && is_in_bounds(t2)
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
fn test_selected_and_swap() {
|
||||||
|
a := Element{358744748052810, 1691584618240980, 977650209285361, 1429865912637724, 560044844278676}
|
||||||
|
b := Element{84926274344903, 473620666599931, 365590438845504, 1028470286882429, 2146499180330972}
|
||||||
|
|
||||||
|
mut c := Element{}
|
||||||
|
mut d := Element{}
|
||||||
|
|
||||||
|
c.selected(a, b, 1)
|
||||||
|
d.selected(a, b, 0)
|
||||||
|
|
||||||
|
assert c.equal(a) == 1
|
||||||
|
assert d.equal(b) == 1
|
||||||
|
|
||||||
|
c.swap(mut d, 0)
|
||||||
|
assert c.equal(a) == 1
|
||||||
|
assert d.equal(b) == 1
|
||||||
|
|
||||||
|
c.swap(mut d, 1)
|
||||||
|
assert c.equal(b) == 1
|
||||||
|
assert d.equal(a) == 1
|
||||||
|
}
|
||||||
|
|
||||||
|
// Tests self-consistency between multiply and Square.
|
||||||
|
fn test_consistency_between_mult_and_square() {
|
||||||
|
mut x := Element{1, 1, 1, 1, 1}
|
||||||
|
mut x2 := Element{}
|
||||||
|
mut x2sq := Element{}
|
||||||
|
|
||||||
|
x2.multiply(x, x)
|
||||||
|
x2sq.square(x)
|
||||||
|
|
||||||
|
assert x2 == x2sq
|
||||||
|
|
||||||
|
bytes := rand.bytes(32) or { return }
|
||||||
|
x.set_bytes(bytes) or { return }
|
||||||
|
x2.multiply(x, x)
|
||||||
|
x2sq.square(x)
|
||||||
|
|
||||||
|
assert x2 == x2sq
|
||||||
|
}
|
||||||
|
|
||||||
|
// to_big_integer returns v as a big.Integer.
|
||||||
|
fn (mut v Element) to_big_integer() big.Integer {
|
||||||
|
buf := v.bytes()
|
||||||
|
return big.integer_from_bytes(buf)
|
||||||
|
}
|
||||||
|
|
||||||
|
// from_big_integer sets v = n, and returns v. The bit length of n must not exceed 256.
|
||||||
|
fn (mut v Element) from_big_integer(n big.Integer) ?Element {
|
||||||
|
if n.binary_str().len > 32 * 8 {
|
||||||
|
return error('invalid edwards25519 element input size')
|
||||||
|
}
|
||||||
|
mut bytes, _ := n.bytes()
|
||||||
|
swap_endianness(mut bytes) // SHOULD I SWAP IT?
|
||||||
|
v.set_bytes(bytes) ?
|
||||||
|
|
||||||
|
return v
|
||||||
|
}
|
||||||
|
|
||||||
|
fn (mut v Element) from_decimal_string(s string) ?Element {
|
||||||
|
num := big.integer_from_string(s) ?
|
||||||
|
|
||||||
|
v = v.from_big_integer(num) ?
|
||||||
|
return v
|
||||||
|
}
|
||||||
|
|
||||||
|
fn test_bytes_big_equivalence() ? {
|
||||||
|
mut inp := rand.bytes(32) ?
|
||||||
|
el := Element{}
|
||||||
|
mut fe := el.generate_element()
|
||||||
|
mut fe1 := el.generate_element()
|
||||||
|
|
||||||
|
fe.set_bytes(inp) or { panic(err.msg) }
|
||||||
|
inp[inp.len - 1] &= (1 << 7) - 1 // mask the most significant bit
|
||||||
|
|
||||||
|
mut b := big.integer_from_bytes(swap_endianness(mut inp)) // need swap_endianness
|
||||||
|
fe1.from_big_integer(b) or { panic(err.msg) } // do swap_endianness internally
|
||||||
|
|
||||||
|
assert fe == fe1
|
||||||
|
|
||||||
|
mut buf := []byte{len: 32} // pad with zeroes
|
||||||
|
fedtobig := fe1.to_big_integer()
|
||||||
|
mut fedbig_bytes, _ := fedtobig.bytes()
|
||||||
|
copy(buf, fedbig_bytes) // does not need to do swap_endianness
|
||||||
|
|
||||||
|
assert fe.bytes() == buf && is_in_bounds(fe) && is_in_bounds(fe1)
|
||||||
|
// assert big_equivalence(inp, fe, fe1) == true
|
||||||
|
}
|
||||||
|
|
||||||
|
fn test_decimal_constants() ? {
|
||||||
|
sqrtm1string := '19681161376707505956807079304988542015446066515923890162744021073123829784752'
|
||||||
|
mut el := Element{}
|
||||||
|
mut exp := el.from_decimal_string(sqrtm1string) ?
|
||||||
|
|
||||||
|
assert sqrt_m1.equal(exp) == 1
|
||||||
|
|
||||||
|
dstring := '37095705934669439343138083508754565189542113879843219016388785533085940283555'
|
||||||
|
exp = el.from_decimal_string(dstring) ?
|
||||||
|
mut d := d_const
|
||||||
|
|
||||||
|
assert d.equal(exp) == 1
|
||||||
|
}
|
||||||
|
|
||||||
|
fn test_mul_64_to_128() {
|
||||||
|
mut a := u64(5)
|
||||||
|
mut b := u64(5)
|
||||||
|
mut r := mul_64(a, b)
|
||||||
|
|
||||||
|
assert r.lo == 0x19
|
||||||
|
assert r.hi == 0
|
||||||
|
|
||||||
|
a = u64(18014398509481983) // 2^54 - 1
|
||||||
|
b = u64(18014398509481983) // 2^54 - 1
|
||||||
|
r = mul_64(a, b)
|
||||||
|
|
||||||
|
assert r.lo == 0xff80000000000001 && r.hi == 0xfffffffffff
|
||||||
|
|
||||||
|
a = u64(1125899906842661)
|
||||||
|
b = u64(2097155)
|
||||||
|
r = mul_64(a, b)
|
||||||
|
r = add_mul_64(r, a, b)
|
||||||
|
r = add_mul_64(r, a, b)
|
||||||
|
r = add_mul_64(r, a, b)
|
||||||
|
r = add_mul_64(r, a, b)
|
||||||
|
|
||||||
|
assert r.lo == 16888498990613035 && r.hi == 640
|
||||||
|
}
|
||||||
|
|
||||||
|
fn test_multiply_distributes_over_add() {
|
||||||
|
for i in 0 .. 10 {
|
||||||
|
el := Element{}
|
||||||
|
x := el.generate_element()
|
||||||
|
y := el.generate_element()
|
||||||
|
z := el.generate_element()
|
||||||
|
mut t1 := Element{}
|
||||||
|
t1.add(x, y)
|
||||||
|
t1.multiply(t1, z)
|
||||||
|
|
||||||
|
// Compute t2 = x*z + y*z
|
||||||
|
mut t2 := Element{}
|
||||||
|
mut t3 := Element{}
|
||||||
|
t2.multiply(x, z)
|
||||||
|
t3.multiply(y, z)
|
||||||
|
t2.add(t2, t3)
|
||||||
|
assert t1.equal(t2) == 1 && is_in_bounds(t1) && is_in_bounds(t2)
|
||||||
|
}
|
||||||
|
}
|
352
vlib/crypto/ed25519/internal/edwards25519/extra.v
Normal file
352
vlib/crypto/ed25519/internal/edwards25519/extra.v
Normal file
@ -0,0 +1,352 @@
|
|||||||
|
module edwards25519
|
||||||
|
|
||||||
|
// extended_coordinates returns v in extended coordinates (X:Y:Z:T) where
|
||||||
|
// x = X/Z, y = Y/Z, and xy = T/Z as in https://eprint.iacr.org/2008/522.
|
||||||
|
fn (mut v Point) extended_coordinates() (Element, Element, Element, Element) {
|
||||||
|
// This function is outlined to make the allocations inline in the caller
|
||||||
|
// rather than happen on the heap. Don't change the style without making
|
||||||
|
// sure it doesn't increase the inliner cost.
|
||||||
|
mut e := []Element{len: 4}
|
||||||
|
x, y, z, t := v.extended_coordinates_generic(mut e)
|
||||||
|
return x, y, z, t
|
||||||
|
}
|
||||||
|
|
||||||
|
fn (mut v Point) extended_coordinates_generic(mut e []Element) (Element, Element, Element, Element) {
|
||||||
|
check_initialized(v)
|
||||||
|
x := e[0].set(v.x)
|
||||||
|
y := e[1].set(v.y)
|
||||||
|
z := e[2].set(v.z)
|
||||||
|
t := e[3].set(v.t)
|
||||||
|
return x, y, z, t
|
||||||
|
}
|
||||||
|
|
||||||
|
// Given k > 0, set s = s**(2*i).
|
||||||
|
fn (mut s Scalar) pow2k(k int) {
|
||||||
|
for i := 0; i < k; i++ {
|
||||||
|
s.multiply(s, s)
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
// set_extended_coordinates sets v = (X:Y:Z:T) in extended coordinates where
|
||||||
|
// x = X/Z, y = Y/Z, and xy = T/Z as in https://eprint.iacr.org/2008/522.
|
||||||
|
//
|
||||||
|
// If the coordinates are invalid or don't represent a valid point on the curve,
|
||||||
|
// set_extended_coordinates returns nil and an error and the receiver is
|
||||||
|
// unchanged. Otherwise, set_extended_coordinates returns v.
|
||||||
|
fn (mut v Point) set_extended_coordinates(x Element, y Element, z Element, t Element) ?Point {
|
||||||
|
if !is_on_curve(x, y, z, t) {
|
||||||
|
return error('edwards25519: invalid point coordinates')
|
||||||
|
}
|
||||||
|
v.x.set(x)
|
||||||
|
v.y.set(y)
|
||||||
|
v.z.set(z)
|
||||||
|
v.t.set(t)
|
||||||
|
return v
|
||||||
|
}
|
||||||
|
|
||||||
|
fn is_on_curve(x Element, y Element, z Element, t Element) bool {
|
||||||
|
mut lhs := Element{}
|
||||||
|
mut rhs := Element{}
|
||||||
|
|
||||||
|
mut xx := Element{}
|
||||||
|
xx.square(x)
|
||||||
|
|
||||||
|
mut yy := Element{}
|
||||||
|
yy.square(y)
|
||||||
|
|
||||||
|
mut zz := Element{}
|
||||||
|
zz.square(z)
|
||||||
|
// zz := new(Element).Square(Z)
|
||||||
|
|
||||||
|
mut tt := Element{}
|
||||||
|
tt.square(t)
|
||||||
|
// tt := new(Element).Square(T)
|
||||||
|
// -x² + y² = 1 + dx²y²
|
||||||
|
// -(X/Z)² + (Y/Z)² = 1 + d(T/Z)²
|
||||||
|
// -X² + Y² = Z² + dT²
|
||||||
|
lhs.subtract(yy, xx)
|
||||||
|
mut d := d_const
|
||||||
|
rhs.multiply(d, tt)
|
||||||
|
rhs.add(rhs, zz)
|
||||||
|
if lhs.equal(rhs) != 1 {
|
||||||
|
return false
|
||||||
|
}
|
||||||
|
// xy = T/Z
|
||||||
|
// XY/Z² = T/Z
|
||||||
|
// XY = TZ
|
||||||
|
lhs.multiply(x, y)
|
||||||
|
rhs.multiply(t, z)
|
||||||
|
return lhs.equal(rhs) == 1
|
||||||
|
}
|
||||||
|
|
||||||
|
// `bytes_montgomery` converts v to a point on the birationally-equivalent
|
||||||
|
// Curve25519 Montgomery curve, and returns its canonical 32 bytes encoding
|
||||||
|
// according to RFC 7748.
|
||||||
|
//
|
||||||
|
// Note that bytes_montgomery only encodes the u-coordinate, so v and -v encode
|
||||||
|
// to the same value. If v is the identity point, bytes_montgomery returns 32
|
||||||
|
// zero bytes, analogously to the X25519 function.
|
||||||
|
pub fn (mut v Point) bytes_montgomery() []byte {
|
||||||
|
// This function is outlined to make the allocations inline in the caller
|
||||||
|
// rather than happen on the heap.
|
||||||
|
mut buf := [32]byte{}
|
||||||
|
return v.bytes_montgomery_generic(mut buf)
|
||||||
|
}
|
||||||
|
|
||||||
|
fn (mut v Point) bytes_montgomery_generic(mut buf [32]byte) []byte {
|
||||||
|
check_initialized(v)
|
||||||
|
|
||||||
|
// RFC 7748, Section 4.1 provides the bilinear map to calculate the
|
||||||
|
// Montgomery u-coordinate
|
||||||
|
//
|
||||||
|
// u = (1 + y) / (1 - y)
|
||||||
|
//
|
||||||
|
// where y = Y / Z.
|
||||||
|
|
||||||
|
mut y := Element{}
|
||||||
|
mut recip := Element{}
|
||||||
|
mut u := Element{}
|
||||||
|
|
||||||
|
y.multiply(v.y, y.invert(v.z)) // y = Y / Z
|
||||||
|
recip.invert(recip.subtract(fe_one, &y)) // r = 1/(1 - y)
|
||||||
|
u.multiply(u.add(fe_one, y), recip) // u = (1 + y)*r
|
||||||
|
|
||||||
|
return copy_field_element(mut buf, mut u)
|
||||||
|
}
|
||||||
|
|
||||||
|
// `mult_by_cofactor` sets v = 8 * p, and returns v.
|
||||||
|
pub fn (mut v Point) mult_by_cofactor(p Point) Point {
|
||||||
|
check_initialized(p)
|
||||||
|
mut result := ProjectiveP1{}
|
||||||
|
mut pp := ProjectiveP2{}
|
||||||
|
pp.from_p3(p)
|
||||||
|
result.double(pp)
|
||||||
|
pp.from_p1(result)
|
||||||
|
result.double(pp)
|
||||||
|
pp.from_p1(result)
|
||||||
|
result.double(pp)
|
||||||
|
return v.from_p1(result)
|
||||||
|
}
|
||||||
|
|
||||||
|
// `invert` sets s to the inverse of a nonzero scalar v, and returns s.
|
||||||
|
//
|
||||||
|
// If t is zero, invert returns zero.
|
||||||
|
pub fn (mut s Scalar) invert(t Scalar) Scalar {
|
||||||
|
// Uses a hardcoded sliding window of width 4.
|
||||||
|
mut table := [8]Scalar{}
|
||||||
|
mut tt := Scalar{}
|
||||||
|
tt.multiply(t, t)
|
||||||
|
table[0] = t
|
||||||
|
for i := 0; i < 7; i++ {
|
||||||
|
table[i + 1].multiply(table[i], tt)
|
||||||
|
}
|
||||||
|
// Now table = [t**1, t**3, t**7, t**11, t**13, t**15]
|
||||||
|
// so t**k = t[k/2] for odd k
|
||||||
|
|
||||||
|
// To compute the sliding window digits, use the following Sage script:
|
||||||
|
|
||||||
|
// sage: import itertools
|
||||||
|
// sage: def sliding_window(w,k):
|
||||||
|
// ....: digits = []
|
||||||
|
// ....: while k > 0:
|
||||||
|
// ....: if k % 2 == 1:
|
||||||
|
// ....: kmod = k % (2**w)
|
||||||
|
// ....: digits.append(kmod)
|
||||||
|
// ....: k = k - kmod
|
||||||
|
// ....: else:
|
||||||
|
// ....: digits.append(0)
|
||||||
|
// ....: k = k // 2
|
||||||
|
// ....: return digits
|
||||||
|
|
||||||
|
// Now we can compute s roughly as follows:
|
||||||
|
|
||||||
|
// sage: s = 1
|
||||||
|
// sage: for coeff in reversed(sliding_window(4,l-2)):
|
||||||
|
// ....: s = s*s
|
||||||
|
// ....: if coeff > 0 :
|
||||||
|
// ....: s = s*t**coeff
|
||||||
|
|
||||||
|
// This works on one bit at a time, with many runs of zeros.
|
||||||
|
// The digits can be collapsed into [(count, coeff)] as follows:
|
||||||
|
|
||||||
|
// sage: [(len(list(group)),d) for d,group in itertools.groupby(sliding_window(4,l-2))]
|
||||||
|
|
||||||
|
// Entries of the form (k, 0) turn into pow2k(k)
|
||||||
|
// Entries of the form (1, coeff) turn into a squaring and then a table lookup.
|
||||||
|
// We can fold the squaring into the previous pow2k(k) as pow2k(k+1).
|
||||||
|
|
||||||
|
s = table[1 / 2]
|
||||||
|
s.pow2k(127 + 1)
|
||||||
|
s.multiply(s, table[1 / 2])
|
||||||
|
s.pow2k(4 + 1)
|
||||||
|
s.multiply(s, table[9 / 2])
|
||||||
|
s.pow2k(3 + 1)
|
||||||
|
s.multiply(s, table[11 / 2])
|
||||||
|
s.pow2k(3 + 1)
|
||||||
|
s.multiply(s, table[13 / 2])
|
||||||
|
s.pow2k(3 + 1)
|
||||||
|
s.multiply(s, table[15 / 2])
|
||||||
|
s.pow2k(4 + 1)
|
||||||
|
s.multiply(s, table[7 / 2])
|
||||||
|
s.pow2k(4 + 1)
|
||||||
|
s.multiply(s, table[15 / 2])
|
||||||
|
s.pow2k(3 + 1)
|
||||||
|
s.multiply(s, table[5 / 2])
|
||||||
|
s.pow2k(3 + 1)
|
||||||
|
s.multiply(s, table[1 / 2])
|
||||||
|
s.pow2k(4 + 1)
|
||||||
|
s.multiply(s, table[15 / 2])
|
||||||
|
s.pow2k(4 + 1)
|
||||||
|
s.multiply(s, table[15 / 2])
|
||||||
|
s.pow2k(4 + 1)
|
||||||
|
s.multiply(s, table[7 / 2])
|
||||||
|
s.pow2k(3 + 1)
|
||||||
|
s.multiply(s, table[3 / 2])
|
||||||
|
s.pow2k(4 + 1)
|
||||||
|
s.multiply(s, table[11 / 2])
|
||||||
|
s.pow2k(5 + 1)
|
||||||
|
s.multiply(s, table[11 / 2])
|
||||||
|
s.pow2k(9 + 1)
|
||||||
|
s.multiply(s, table[9 / 2])
|
||||||
|
s.pow2k(3 + 1)
|
||||||
|
s.multiply(s, table[3 / 2])
|
||||||
|
s.pow2k(4 + 1)
|
||||||
|
s.multiply(s, table[3 / 2])
|
||||||
|
s.pow2k(4 + 1)
|
||||||
|
s.multiply(s, table[3 / 2])
|
||||||
|
s.pow2k(4 + 1)
|
||||||
|
s.multiply(s, table[9 / 2])
|
||||||
|
s.pow2k(3 + 1)
|
||||||
|
s.multiply(s, table[7 / 2])
|
||||||
|
s.pow2k(3 + 1)
|
||||||
|
s.multiply(s, table[3 / 2])
|
||||||
|
s.pow2k(3 + 1)
|
||||||
|
s.multiply(s, table[13 / 2])
|
||||||
|
s.pow2k(3 + 1)
|
||||||
|
s.multiply(s, table[7 / 2])
|
||||||
|
s.pow2k(4 + 1)
|
||||||
|
s.multiply(s, table[9 / 2])
|
||||||
|
s.pow2k(3 + 1)
|
||||||
|
s.multiply(s, table[15 / 2])
|
||||||
|
s.pow2k(4 + 1)
|
||||||
|
s.multiply(s, table[11 / 2])
|
||||||
|
|
||||||
|
return s
|
||||||
|
}
|
||||||
|
|
||||||
|
// `multi_scalar_mult` sets v = sum(scalars[i] * points[i]), and returns v.
|
||||||
|
//
|
||||||
|
// Execution time depends only on the lengths of the two slices, which must match.
|
||||||
|
pub fn (mut v Point) multi_scalar_mult(scalars []Scalar, points []Point) Point {
|
||||||
|
if scalars.len != points.len {
|
||||||
|
panic('edwards25519: called multi_scalar_mult with different size inputs')
|
||||||
|
}
|
||||||
|
check_initialized(...points)
|
||||||
|
|
||||||
|
mut sc := scalars.clone()
|
||||||
|
// Proceed as in the single-base case, but share doublings
|
||||||
|
// between each point in the multiscalar equation.
|
||||||
|
|
||||||
|
// Build lookup tables for each point
|
||||||
|
mut tables := []ProjLookupTable{len: points.len}
|
||||||
|
for i, _ in tables {
|
||||||
|
tables[i].from_p3(points[i])
|
||||||
|
}
|
||||||
|
// Compute signed radix-16 digits for each scalar
|
||||||
|
// digits := make([][64]int8, len(scalars))
|
||||||
|
mut digits := [][]i8{len: sc.len, init: []i8{len: 64, cap: 64}}
|
||||||
|
|
||||||
|
for j, _ in digits {
|
||||||
|
digits[j] = sc[j].signed_radix16()
|
||||||
|
}
|
||||||
|
|
||||||
|
// Unwrap first loop iteration to save computing 16*identity
|
||||||
|
mut multiple := ProjectiveCached{}
|
||||||
|
mut tmp1 := ProjectiveP1{}
|
||||||
|
mut tmp2 := ProjectiveP2{}
|
||||||
|
// Lookup-and-add the appropriate multiple of each input point
|
||||||
|
for k, _ in tables {
|
||||||
|
tables[k].select_into(mut multiple, digits[k][63])
|
||||||
|
tmp1.add(v, multiple) // tmp1 = v + x_(j,63)*Q in P1xP1 coords
|
||||||
|
v.from_p1(tmp1) // update v
|
||||||
|
}
|
||||||
|
tmp2.from_p3(v) // set up tmp2 = v in P2 coords for next iteration
|
||||||
|
for r := 62; r >= 0; r-- {
|
||||||
|
tmp1.double(tmp2) // tmp1 = 2*(prev) in P1xP1 coords
|
||||||
|
tmp2.from_p1(tmp1) // tmp2 = 2*(prev) in P2 coords
|
||||||
|
tmp1.double(tmp2) // tmp1 = 4*(prev) in P1xP1 coords
|
||||||
|
tmp2.from_p1(tmp1) // tmp2 = 4*(prev) in P2 coords
|
||||||
|
tmp1.double(tmp2) // tmp1 = 8*(prev) in P1xP1 coords
|
||||||
|
tmp2.from_p1(tmp1) // tmp2 = 8*(prev) in P2 coords
|
||||||
|
tmp1.double(tmp2) // tmp1 = 16*(prev) in P1xP1 coords
|
||||||
|
v.from_p1(tmp1) // v = 16*(prev) in P3 coords
|
||||||
|
// Lookup-and-add the appropriate multiple of each input point
|
||||||
|
for s, _ in tables {
|
||||||
|
tables[s].select_into(mut multiple, digits[s][r])
|
||||||
|
tmp1.add(v, multiple) // tmp1 = v + x_(j,i)*Q in P1xP1 coords
|
||||||
|
v.from_p1(tmp1) // update v
|
||||||
|
}
|
||||||
|
tmp2.from_p3(v) // set up tmp2 = v in P2 coords for next iteration
|
||||||
|
}
|
||||||
|
return v
|
||||||
|
}
|
||||||
|
|
||||||
|
// `vartime_multiscalar_mult` sets v = sum(scalars[i] * points[i]), and returns v.
|
||||||
|
//
|
||||||
|
// Execution time depends on the inputs.
|
||||||
|
pub fn (mut v Point) vartime_multiscalar_mult(scalars []Scalar, points []Point) Point {
|
||||||
|
if scalars.len != points.len {
|
||||||
|
panic('edwards25519: called VarTimeMultiScalarMult with different size inputs')
|
||||||
|
}
|
||||||
|
check_initialized(...points)
|
||||||
|
|
||||||
|
// Generalize double-base NAF computation to arbitrary sizes.
|
||||||
|
// Here all the points are dynamic, so we only use the smaller
|
||||||
|
// tables.
|
||||||
|
|
||||||
|
// Build lookup tables for each point
|
||||||
|
mut tables := []NafLookupTable5{len: points.len}
|
||||||
|
for i, _ in tables {
|
||||||
|
tables[i].from_p3(points[i])
|
||||||
|
}
|
||||||
|
mut sc := scalars.clone()
|
||||||
|
// Compute a NAF for each scalar
|
||||||
|
// mut nafs := make([][256]int8, len(scalars))
|
||||||
|
mut nafs := [][]i8{len: sc.len, init: []i8{len: 256, cap: 256}}
|
||||||
|
for j, _ in nafs {
|
||||||
|
nafs[j] = sc[j].non_adjacent_form(5)
|
||||||
|
}
|
||||||
|
|
||||||
|
mut multiple := ProjectiveCached{}
|
||||||
|
mut tmp1 := ProjectiveP1{}
|
||||||
|
mut tmp2 := ProjectiveP2{}
|
||||||
|
tmp2.zero()
|
||||||
|
|
||||||
|
// Move from high to low bits, doubling the accumulator
|
||||||
|
// at each iteration and checking whether there is a nonzero
|
||||||
|
// coefficient to look up a multiple of.
|
||||||
|
//
|
||||||
|
// Skip trying to find the first nonzero coefficent, because
|
||||||
|
// searching might be more work than a few extra doublings.
|
||||||
|
// k == i, l == j
|
||||||
|
for k := 255; k >= 0; k-- {
|
||||||
|
tmp1.double(tmp2)
|
||||||
|
|
||||||
|
for l, _ in nafs {
|
||||||
|
if nafs[l][k] > 0 {
|
||||||
|
v.from_p1(tmp1)
|
||||||
|
tables[l].select_into(mut multiple, nafs[l][k])
|
||||||
|
tmp1.add(v, multiple)
|
||||||
|
} else if nafs[l][k] < 0 {
|
||||||
|
v.from_p1(tmp1)
|
||||||
|
tables[l].select_into(mut multiple, -nafs[l][k])
|
||||||
|
tmp1.sub(v, multiple)
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
tmp2.from_p1(tmp1)
|
||||||
|
}
|
||||||
|
|
||||||
|
v.from_p2(tmp2)
|
||||||
|
return v
|
||||||
|
}
|
204
vlib/crypto/ed25519/internal/edwards25519/extra_test.v
Normal file
204
vlib/crypto/ed25519/internal/edwards25519/extra_test.v
Normal file
@ -0,0 +1,204 @@
|
|||||||
|
module edwards25519
|
||||||
|
|
||||||
|
import os
|
||||||
|
import rand
|
||||||
|
import encoding.hex
|
||||||
|
|
||||||
|
const github_job = os.getenv('GITHUB_JOB')
|
||||||
|
|
||||||
|
fn testsuite_begin() {
|
||||||
|
if edwards25519.github_job != '' {
|
||||||
|
// ensure that the CI does not run flaky tests:
|
||||||
|
rand.seed([u32(0xffff24), 0xabcd])
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
// test_bytes_montgomery tests the set_bytes_with_clamping+bytes_montgomery path
|
||||||
|
// equivalence to curve25519.X25519 for basepoint scalar multiplications.
|
||||||
|
//
|
||||||
|
// Note that you can't actually implement X25519 with this package because
|
||||||
|
// there is no SetBytesMontgomery, and it would not be possible to implement
|
||||||
|
// it properly: points on the twist would get rejected, and the Scalar returned
|
||||||
|
// by set_bytes_with_clamping does not preserve its cofactor-clearing properties.
|
||||||
|
//
|
||||||
|
// Disabled curve25519 not available yet, but maybe can use own curve25519
|
||||||
|
/*
|
||||||
|
fn fn_mon(scalar [32]byte) bool {
|
||||||
|
mut s := new_scalar().set_bytes_with_clamping(scalar[..])
|
||||||
|
p := (&Point{}).scalar_base_mult(s)
|
||||||
|
got := p.bytes_montgomery()
|
||||||
|
want, _ := curve25519.X25519(scalar[..], curve25519.Basepoint)
|
||||||
|
return bytes.equal(got, want)
|
||||||
|
}
|
||||||
|
|
||||||
|
fn test_bytes_montgomery() {
|
||||||
|
/* f := fn(scalar [32]byte) bool {
|
||||||
|
s := new_scalar().set_bytes_with_clamping(scalar[..])
|
||||||
|
p := (&Point{}).scalar_base_mult(s)
|
||||||
|
got := p.bytes_montgomery()
|
||||||
|
want, _ := curve25519.X25519(scalar[..], curve25519.Basepoint)
|
||||||
|
return bytes.equal(got, want)
|
||||||
|
} */
|
||||||
|
if err := quick.Check(f, nil); err != nil {
|
||||||
|
t.Error(err)
|
||||||
|
}
|
||||||
|
}*/
|
||||||
|
|
||||||
|
fn test_bytes_montgomery_sodium() ? {
|
||||||
|
// Generated with libsodium.js 1.0.18
|
||||||
|
// crypto_sign_keypair().pubkey
|
||||||
|
pubkey := '3bf918ffc2c955dc895bf145f566fb96623c1cadbe040091175764b5fde322c0'
|
||||||
|
mut p := Point{}
|
||||||
|
p.set_bytes(hex.decode(pubkey) ?) ?
|
||||||
|
|
||||||
|
// crypto_sign_ed25519_pk_to_curve25519(pubkey)
|
||||||
|
want := 'efc6c9d0738e9ea18d738ad4a2653631558931b0f1fde4dd58c436d19686dc28'
|
||||||
|
got := hex.encode(p.bytes_montgomery())
|
||||||
|
assert got == want
|
||||||
|
}
|
||||||
|
|
||||||
|
fn test_bytes_montgomery_infinity() {
|
||||||
|
mut p := new_identity_point()
|
||||||
|
want := '0000000000000000000000000000000000000000000000000000000000000000'
|
||||||
|
got := hex.encode(p.bytes_montgomery())
|
||||||
|
|
||||||
|
assert got == want
|
||||||
|
}
|
||||||
|
|
||||||
|
const (
|
||||||
|
loworder_string = '26e8958fc2b227b045c3f489f2ef98f0d5dfac05d3c63339b13802886d53fc85'
|
||||||
|
loworder_bytes = hex.decode(loworder_string) or { panic(err.msg) }
|
||||||
|
)
|
||||||
|
|
||||||
|
fn fn_cofactor(mut data []byte) bool {
|
||||||
|
if data.len != 64 {
|
||||||
|
panic('err.msg')
|
||||||
|
}
|
||||||
|
mut loworder := Point{}
|
||||||
|
loworder.set_bytes(edwards25519.loworder_bytes) or { panic(err.msg) }
|
||||||
|
|
||||||
|
mut s := new_scalar()
|
||||||
|
mut p := Point{}
|
||||||
|
mut p8 := Point{}
|
||||||
|
s.set_uniform_bytes(data) or { panic(err.msg) }
|
||||||
|
p.scalar_base_mult(mut s)
|
||||||
|
p8.mult_by_cofactor(p)
|
||||||
|
|
||||||
|
assert check_on_curve(p8) == true
|
||||||
|
|
||||||
|
// 8 * p == (8 * s) * B
|
||||||
|
mut sc := Scalar{
|
||||||
|
s: [32]byte{}
|
||||||
|
}
|
||||||
|
sc.s[0] = byte(0x08)
|
||||||
|
s.multiply(s, sc)
|
||||||
|
mut pp := Point{}
|
||||||
|
pp.scalar_base_mult(mut s)
|
||||||
|
if p8.equal(pp) != 1 {
|
||||||
|
return false
|
||||||
|
}
|
||||||
|
|
||||||
|
// 8 * p == 8 * (loworder + p)
|
||||||
|
pp.add(p, loworder)
|
||||||
|
pp.mult_by_cofactor(pp)
|
||||||
|
if p8.equal(pp) != 1 {
|
||||||
|
return false
|
||||||
|
}
|
||||||
|
|
||||||
|
// 8 * p == p + p + p + p + p + p + p + p
|
||||||
|
pp.set(new_identity_point())
|
||||||
|
for i := 0; i < 8; i++ {
|
||||||
|
pp.add(pp, p)
|
||||||
|
}
|
||||||
|
return p8.equal(pp) == 1
|
||||||
|
}
|
||||||
|
|
||||||
|
fn test_mult_by_cofactor() ? {
|
||||||
|
mut loworder := Point{}
|
||||||
|
mut data := rand.bytes(64) ?
|
||||||
|
|
||||||
|
assert fn_cofactor(mut data) == true
|
||||||
|
}
|
||||||
|
|
||||||
|
fn invert_works(mut xinv Scalar, x NotZeroScalar) bool {
|
||||||
|
xinv.invert(x)
|
||||||
|
mut check := Scalar{}
|
||||||
|
check.multiply(x, xinv)
|
||||||
|
return check == sc_one && is_reduced(xinv)
|
||||||
|
}
|
||||||
|
|
||||||
|
fn test_scalar_invert() {
|
||||||
|
nsc := generate_notzero_scalar(5) or { panic(err.msg) }
|
||||||
|
mut xsc := generate_scalar(5) or { panic(err.msg) }
|
||||||
|
assert invert_works(mut xsc, nsc) == true
|
||||||
|
|
||||||
|
mut zero := new_scalar()
|
||||||
|
mut xx := new_scalar()
|
||||||
|
xx.invert(zero)
|
||||||
|
assert xx.equal(zero) == 1
|
||||||
|
}
|
||||||
|
|
||||||
|
fn test_multiscalarmultmatchesbasemult() {
|
||||||
|
for i in 0 .. 6 {
|
||||||
|
x := generate_scalar(100) or { panic(err.msg) }
|
||||||
|
y := generate_scalar(5) or { panic(err.msg) }
|
||||||
|
z := generate_scalar(2) or { panic(err.msg) }
|
||||||
|
assert multiscalarmultmatchesbasemult(x, y, z) == true
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
fn multiscalarmultmatchesbasemult(xx Scalar, yy Scalar, zz Scalar) bool {
|
||||||
|
mut x := xx
|
||||||
|
mut y := yy
|
||||||
|
mut z := zz
|
||||||
|
|
||||||
|
mut p := Point{}
|
||||||
|
mut q1 := Point{}
|
||||||
|
mut q2 := Point{}
|
||||||
|
mut q3 := Point{}
|
||||||
|
mut check := Point{}
|
||||||
|
mut b := new_generator_point()
|
||||||
|
|
||||||
|
p.multi_scalar_mult([x, y, z], [b, b, b])
|
||||||
|
|
||||||
|
q1.scalar_base_mult(mut x)
|
||||||
|
q2.scalar_base_mult(mut y)
|
||||||
|
q3.scalar_base_mult(mut z)
|
||||||
|
check.add(q1, q2)
|
||||||
|
check.add(check, q3)
|
||||||
|
|
||||||
|
check_on_curve(p, check, q1, q2, q3)
|
||||||
|
return p.equal(check) == 1
|
||||||
|
}
|
||||||
|
|
||||||
|
fn vartime_multiscala_rmultmatches_basemult(xx Scalar, yy Scalar, zz Scalar) bool {
|
||||||
|
mut x := xx
|
||||||
|
mut y := yy
|
||||||
|
mut z := zz
|
||||||
|
mut p := Point{}
|
||||||
|
mut q1 := Point{}
|
||||||
|
mut q2 := Point{}
|
||||||
|
mut q3 := Point{}
|
||||||
|
mut check := Point{}
|
||||||
|
mut b := new_generator_point()
|
||||||
|
|
||||||
|
p.vartime_multiscalar_mult([x, y, z], [b, b, b])
|
||||||
|
|
||||||
|
q1.scalar_base_mult(mut x)
|
||||||
|
q2.scalar_base_mult(mut y)
|
||||||
|
q3.scalar_base_mult(mut z)
|
||||||
|
check.add(q1, q2)
|
||||||
|
check.add(check, q3)
|
||||||
|
|
||||||
|
check_on_curve(p, check, q1, q2, q3)
|
||||||
|
return p.equal(check) == 1
|
||||||
|
}
|
||||||
|
|
||||||
|
fn test_vartimemultiscalarmultmatchesbasemult() {
|
||||||
|
for i in 0 .. 5 {
|
||||||
|
x := generate_scalar(100) or { panic(err.msg) }
|
||||||
|
y := generate_scalar(5) or { panic(err.msg) }
|
||||||
|
z := generate_scalar(2) or { panic(err.msg) }
|
||||||
|
assert vartime_multiscala_rmultmatches_basemult(x, y, z) == true
|
||||||
|
}
|
||||||
|
}
|
551
vlib/crypto/ed25519/internal/edwards25519/point.v
Normal file
551
vlib/crypto/ed25519/internal/edwards25519/point.v
Normal file
@ -0,0 +1,551 @@
|
|||||||
|
module edwards25519
|
||||||
|
|
||||||
|
const (
|
||||||
|
// d is a constant in the curve equation.
|
||||||
|
d_bytes = [byte(0xa3), 0x78, 0x59, 0x13, 0xca, 0x4d, 0xeb, 0x75, 0xab, 0xd8, 0x41, 0x41,
|
||||||
|
0x4d, 0x0a, 0x70, 0x00, 0x98, 0xe8, 0x79, 0x77, 0x79, 0x40, 0xc7, 0x8c, 0x73, 0xfe, 0x6f,
|
||||||
|
0x2b, 0xee, 0x6c, 0x03, 0x52]
|
||||||
|
id_bytes = [byte(1), 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
|
||||||
|
0, 0, 0, 0, 0, 0, 0, 0]
|
||||||
|
gen_bytes = [byte(0x58), 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66,
|
||||||
|
0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66,
|
||||||
|
0x66, 0x66, 0x66, 0x66, 0x66]
|
||||||
|
d_const = d_const_generate() or { panic(err.msg) }
|
||||||
|
d2_const = d2_const_generate() or { panic(err.msg) }
|
||||||
|
// id_point is the point at infinity.
|
||||||
|
id_point = id_point_generate() or { panic(err.msg) }
|
||||||
|
// generator point
|
||||||
|
gen_point = generator() or { panic(err.msg) }
|
||||||
|
)
|
||||||
|
|
||||||
|
fn d_const_generate() ?Element {
|
||||||
|
mut v := Element{}
|
||||||
|
v.set_bytes(edwards25519.d_bytes) ?
|
||||||
|
return v
|
||||||
|
}
|
||||||
|
|
||||||
|
fn d2_const_generate() ?Element {
|
||||||
|
mut v := Element{}
|
||||||
|
v.add(edwards25519.d_const, edwards25519.d_const)
|
||||||
|
return v
|
||||||
|
}
|
||||||
|
|
||||||
|
// id_point_generate is the point at infinity.
|
||||||
|
fn id_point_generate() ?Point {
|
||||||
|
mut p := Point{}
|
||||||
|
p.set_bytes(edwards25519.id_bytes) ?
|
||||||
|
return p
|
||||||
|
}
|
||||||
|
|
||||||
|
// generator is the canonical curve basepoint. See TestGenerator for the
|
||||||
|
// correspondence of this encoding with the values in RFC 8032.
|
||||||
|
fn generator() ?Point {
|
||||||
|
mut p := Point{}
|
||||||
|
p.set_bytes(edwards25519.gen_bytes) ?
|
||||||
|
return p
|
||||||
|
}
|
||||||
|
|
||||||
|
// Point types.
|
||||||
|
|
||||||
|
struct ProjectiveP1 {
|
||||||
|
mut:
|
||||||
|
x Element
|
||||||
|
y Element
|
||||||
|
z Element
|
||||||
|
t Element
|
||||||
|
}
|
||||||
|
|
||||||
|
struct ProjectiveP2 {
|
||||||
|
mut:
|
||||||
|
x Element
|
||||||
|
y Element
|
||||||
|
z Element
|
||||||
|
}
|
||||||
|
|
||||||
|
// Point represents a point on the edwards25519 curve.
|
||||||
|
//
|
||||||
|
// This type works similarly to math/big.Int, and all arguments and receivers
|
||||||
|
// are allowed to alias.
|
||||||
|
//
|
||||||
|
// The zero value is NOT valid, and it may be used only as a receiver.
|
||||||
|
pub struct Point {
|
||||||
|
mut:
|
||||||
|
// The point is internally represented in extended coordinates (x, y, z, T)
|
||||||
|
// where x = x/z, y = y/z, and xy = T/z per https://eprint.iacr.org/2008/522.
|
||||||
|
x Element
|
||||||
|
y Element
|
||||||
|
z Element
|
||||||
|
t Element
|
||||||
|
// Make the type not comparable (i.e. used with == or as a map key), as
|
||||||
|
// equivalent points can be represented by different Go values.
|
||||||
|
// _ incomparable
|
||||||
|
}
|
||||||
|
|
||||||
|
fn check_initialized(points ...Point) {
|
||||||
|
for _, p in points {
|
||||||
|
if p.x == fe_zero && p.y == fe_zero {
|
||||||
|
panic('edwards25519: use of uninitialized Point')
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
struct ProjectiveCached {
|
||||||
|
mut:
|
||||||
|
ypx Element // y + x
|
||||||
|
ymx Element // y - x
|
||||||
|
z Element
|
||||||
|
t2d Element
|
||||||
|
}
|
||||||
|
|
||||||
|
struct AffineCached {
|
||||||
|
mut:
|
||||||
|
ypx Element // y + x
|
||||||
|
ymx Element // y - x
|
||||||
|
t2d Element
|
||||||
|
}
|
||||||
|
|
||||||
|
fn (mut v ProjectiveP2) zero() ProjectiveP2 {
|
||||||
|
v.x.zero()
|
||||||
|
v.y.one()
|
||||||
|
v.z.one()
|
||||||
|
return v
|
||||||
|
}
|
||||||
|
|
||||||
|
// set_bytes sets v = x, where x is a 32-byte encoding of v. If x does not
|
||||||
|
// represent a valid point on the curve, set_bytes returns nil and an error and
|
||||||
|
// the receiver is unchanged. Otherwise, set_bytes returns v.
|
||||||
|
//
|
||||||
|
// Note that set_bytes accepts all non-canonical encodings of valid points.
|
||||||
|
// That is, it follows decoding rules that match most implementations in
|
||||||
|
// the ecosystem rather than RFC 8032.
|
||||||
|
pub fn (mut v Point) set_bytes(x []byte) ?Point {
|
||||||
|
// Specifically, the non-canonical encodings that are accepted are
|
||||||
|
// 1) the ones where the edwards25519 element is not reduced (see the
|
||||||
|
// (*edwards25519.Element).set_bytes docs) and
|
||||||
|
// 2) the ones where the x-coordinate is zero and the sign bit is set.
|
||||||
|
//
|
||||||
|
// This is consistent with crypto/ed25519/internal/edwards25519. Read more
|
||||||
|
// at https://hdevalence.ca/blog/2020-10-04-its-25519am, specifically the
|
||||||
|
// "Canonical A, R" section.
|
||||||
|
mut el0 := Element{}
|
||||||
|
y := el0.set_bytes(x) or { return error('edwards25519: invalid point encoding length') }
|
||||||
|
|
||||||
|
// -x² + y² = 1 + dx²y²
|
||||||
|
// x² + dx²y² = x²(dy² + 1) = y² - 1
|
||||||
|
// x² = (y² - 1) / (dy² + 1)
|
||||||
|
|
||||||
|
// u = y² - 1
|
||||||
|
mut el1 := Element{}
|
||||||
|
y2 := el1.square(y)
|
||||||
|
mut el2 := Element{}
|
||||||
|
u := el2.subtract(y2, fe_one)
|
||||||
|
|
||||||
|
// v = dy² + 1
|
||||||
|
mut el3 := Element{}
|
||||||
|
mut vv := el3.multiply(y2, edwards25519.d_const)
|
||||||
|
vv = vv.add(vv, fe_one)
|
||||||
|
|
||||||
|
// x = +√(u/v)
|
||||||
|
mut el4 := Element{}
|
||||||
|
mut xx, was_square := el4.sqrt_ratio(u, vv)
|
||||||
|
if was_square == 0 {
|
||||||
|
return error('edwards25519: invalid point encoding')
|
||||||
|
}
|
||||||
|
|
||||||
|
// selected the negative square root if the sign bit is set.
|
||||||
|
mut el5 := Element{}
|
||||||
|
xx_neg := el5.negate(xx)
|
||||||
|
xx.selected(xx_neg, xx, int(x[31] >> 7))
|
||||||
|
|
||||||
|
v.x.set(xx)
|
||||||
|
v.y.set(y)
|
||||||
|
v.z.one()
|
||||||
|
v.t.multiply(xx, y) // xy = T / z
|
||||||
|
|
||||||
|
return v
|
||||||
|
}
|
||||||
|
|
||||||
|
// `set` sets v = u, and returns v.
|
||||||
|
pub fn (mut v Point) set(u Point) Point {
|
||||||
|
v = u
|
||||||
|
return v
|
||||||
|
}
|
||||||
|
|
||||||
|
// `new_identity_point` returns a new Point set to the identity.
|
||||||
|
pub fn new_identity_point() Point {
|
||||||
|
mut p := Point{}
|
||||||
|
return p.set(edwards25519.id_point)
|
||||||
|
}
|
||||||
|
|
||||||
|
// `new_generator_point` returns a new Point set to the canonical generator.
|
||||||
|
pub fn new_generator_point() Point {
|
||||||
|
mut p := Point{}
|
||||||
|
return p.set(edwards25519.gen_point)
|
||||||
|
}
|
||||||
|
|
||||||
|
fn (mut v ProjectiveCached) zero() ProjectiveCached {
|
||||||
|
v.ypx.one()
|
||||||
|
v.ymx.one()
|
||||||
|
v.z.one()
|
||||||
|
v.t2d.zero()
|
||||||
|
return v
|
||||||
|
}
|
||||||
|
|
||||||
|
fn (mut v AffineCached) zero() AffineCached {
|
||||||
|
v.ypx.one()
|
||||||
|
v.ymx.one()
|
||||||
|
v.t2d.zero()
|
||||||
|
return v
|
||||||
|
}
|
||||||
|
|
||||||
|
// Encoding.
|
||||||
|
|
||||||
|
// `bytes` returns the canonical 32-byte encoding of v, according to RFC 8032,
|
||||||
|
// Section 5.1.2.
|
||||||
|
pub fn (mut v Point) bytes() []byte {
|
||||||
|
// This function is outlined to make the allocations inline in the caller
|
||||||
|
// rather than happen on the heap.
|
||||||
|
mut buf := [32]byte{}
|
||||||
|
return v.bytes_generic(mut buf)
|
||||||
|
}
|
||||||
|
|
||||||
|
fn (mut v Point) bytes_generic(mut buf [32]byte) []byte {
|
||||||
|
check_initialized(v)
|
||||||
|
|
||||||
|
mut zinv := Element{}
|
||||||
|
mut x := Element{}
|
||||||
|
mut y := Element{}
|
||||||
|
zinv.invert(v.z) // zinv = 1 / z
|
||||||
|
x.multiply(v.x, zinv) // x = x / z
|
||||||
|
y.multiply(v.y, zinv) // y = y / z
|
||||||
|
|
||||||
|
mut out := copy_field_element(mut buf, mut y)
|
||||||
|
unsafe {
|
||||||
|
// out[31] |= byte(x.is_negative() << 7) //original one
|
||||||
|
out[31] |= byte(x.is_negative() * 128) // x << 7 == x * 2^7
|
||||||
|
}
|
||||||
|
return out
|
||||||
|
}
|
||||||
|
|
||||||
|
fn copy_field_element(mut buf [32]byte, mut v Element) []byte {
|
||||||
|
// this fail in test
|
||||||
|
/*
|
||||||
|
copy(buf[..], v.bytes())
|
||||||
|
return buf[..]
|
||||||
|
*/
|
||||||
|
|
||||||
|
// this pass the test
|
||||||
|
mut out := []byte{len: 32}
|
||||||
|
for i := 0; i <= buf.len - 1; i++ {
|
||||||
|
out[i] = v.bytes()[i]
|
||||||
|
}
|
||||||
|
|
||||||
|
return out
|
||||||
|
}
|
||||||
|
|
||||||
|
// Conversions.
|
||||||
|
|
||||||
|
fn (mut v ProjectiveP2) from_p1(p ProjectiveP1) ProjectiveP2 {
|
||||||
|
v.x.multiply(p.x, p.t)
|
||||||
|
v.y.multiply(p.y, p.z)
|
||||||
|
v.z.multiply(p.z, p.t)
|
||||||
|
return v
|
||||||
|
}
|
||||||
|
|
||||||
|
fn (mut v ProjectiveP2) from_p3(p Point) ProjectiveP2 {
|
||||||
|
v.x.set(p.x)
|
||||||
|
v.y.set(p.y)
|
||||||
|
v.z.set(p.z)
|
||||||
|
return v
|
||||||
|
}
|
||||||
|
|
||||||
|
fn (mut v Point) from_p1(p ProjectiveP1) Point {
|
||||||
|
v.x.multiply(p.x, p.t)
|
||||||
|
v.y.multiply(p.y, p.z)
|
||||||
|
v.z.multiply(p.z, p.t)
|
||||||
|
v.t.multiply(p.x, p.y)
|
||||||
|
return v
|
||||||
|
}
|
||||||
|
|
||||||
|
fn (mut v Point) from_p2(p ProjectiveP2) Point {
|
||||||
|
v.x.multiply(p.x, p.z)
|
||||||
|
v.y.multiply(p.y, p.z)
|
||||||
|
v.z.square(p.z)
|
||||||
|
v.t.multiply(p.x, p.y)
|
||||||
|
return v
|
||||||
|
}
|
||||||
|
|
||||||
|
fn (mut v ProjectiveCached) from_p3(p Point) ProjectiveCached {
|
||||||
|
v.ypx.add(p.y, p.x)
|
||||||
|
v.ymx.subtract(p.y, p.x)
|
||||||
|
v.z.set(p.z)
|
||||||
|
v.t2d.multiply(p.t, edwards25519.d2_const)
|
||||||
|
return v
|
||||||
|
}
|
||||||
|
|
||||||
|
fn (mut v AffineCached) from_p3(p Point) AffineCached {
|
||||||
|
v.ypx.add(p.y, p.x)
|
||||||
|
v.ymx.subtract(p.y, p.x)
|
||||||
|
v.t2d.multiply(p.t, edwards25519.d2_const)
|
||||||
|
|
||||||
|
mut invz := Element{}
|
||||||
|
invz.invert(p.z)
|
||||||
|
v.ypx.multiply(v.ypx, invz)
|
||||||
|
v.ymx.multiply(v.ymx, invz)
|
||||||
|
v.t2d.multiply(v.t2d, invz)
|
||||||
|
return v
|
||||||
|
}
|
||||||
|
|
||||||
|
// (Re)addition and subtraction.
|
||||||
|
|
||||||
|
// `add` sets v = p + q, and returns v.
|
||||||
|
pub fn (mut v Point) add(p Point, q Point) Point {
|
||||||
|
check_initialized(p, q)
|
||||||
|
mut pc := ProjectiveCached{}
|
||||||
|
mut p1 := ProjectiveP1{}
|
||||||
|
qcached := pc.from_p3(q)
|
||||||
|
|
||||||
|
result := p1.add(p, qcached)
|
||||||
|
return v.from_p1(result)
|
||||||
|
}
|
||||||
|
|
||||||
|
// `subtract` sets v = p - q, and returns v.
|
||||||
|
pub fn (mut v Point) subtract(p Point, q Point) Point {
|
||||||
|
check_initialized(p, q)
|
||||||
|
mut pc := ProjectiveCached{}
|
||||||
|
mut p1 := ProjectiveP1{}
|
||||||
|
qcached := pc.from_p3(q)
|
||||||
|
result := p1.sub(p, qcached)
|
||||||
|
return v.from_p1(result)
|
||||||
|
}
|
||||||
|
|
||||||
|
fn (mut v ProjectiveP1) add(p Point, q ProjectiveCached) ProjectiveP1 {
|
||||||
|
// var ypx, ymx, pp, mm, tt2d, zz2 edwards25519.Element
|
||||||
|
mut ypx := Element{}
|
||||||
|
mut ymx := Element{}
|
||||||
|
mut pp := Element{}
|
||||||
|
mut mm := Element{}
|
||||||
|
mut tt2d := Element{}
|
||||||
|
mut zz2 := Element{}
|
||||||
|
|
||||||
|
ypx.add(p.y, p.x)
|
||||||
|
ymx.subtract(p.y, p.x)
|
||||||
|
|
||||||
|
pp.multiply(ypx, q.ypx)
|
||||||
|
mm.multiply(ymx, q.ymx)
|
||||||
|
tt2d.multiply(p.t, q.t2d)
|
||||||
|
zz2.multiply(p.z, q.z)
|
||||||
|
|
||||||
|
zz2.add(zz2, zz2)
|
||||||
|
|
||||||
|
v.x.subtract(pp, mm)
|
||||||
|
v.y.add(pp, mm)
|
||||||
|
v.z.add(zz2, tt2d)
|
||||||
|
v.t.subtract(zz2, tt2d)
|
||||||
|
return v
|
||||||
|
}
|
||||||
|
|
||||||
|
fn (mut v ProjectiveP1) sub(p Point, q ProjectiveCached) ProjectiveP1 {
|
||||||
|
mut ypx := Element{}
|
||||||
|
mut ymx := Element{}
|
||||||
|
mut pp := Element{}
|
||||||
|
mut mm := Element{}
|
||||||
|
mut tt2d := Element{}
|
||||||
|
mut zz2 := Element{}
|
||||||
|
|
||||||
|
ypx.add(p.y, p.x)
|
||||||
|
ymx.subtract(p.y, p.x)
|
||||||
|
|
||||||
|
pp.multiply(&ypx, q.ymx) // flipped sign
|
||||||
|
mm.multiply(&ymx, q.ypx) // flipped sign
|
||||||
|
tt2d.multiply(p.t, q.t2d)
|
||||||
|
zz2.multiply(p.z, q.z)
|
||||||
|
|
||||||
|
zz2.add(zz2, zz2)
|
||||||
|
|
||||||
|
v.x.subtract(pp, mm)
|
||||||
|
v.y.add(pp, mm)
|
||||||
|
v.z.subtract(zz2, tt2d) // flipped sign
|
||||||
|
v.t.add(zz2, tt2d) // flipped sign
|
||||||
|
return v
|
||||||
|
}
|
||||||
|
|
||||||
|
fn (mut v ProjectiveP1) add_affine(p Point, q AffineCached) ProjectiveP1 {
|
||||||
|
mut ypx := Element{}
|
||||||
|
mut ymx := Element{}
|
||||||
|
mut pp := Element{}
|
||||||
|
mut mm := Element{}
|
||||||
|
mut tt2d := Element{}
|
||||||
|
mut z2 := Element{}
|
||||||
|
|
||||||
|
ypx.add(p.y, p.x)
|
||||||
|
ymx.subtract(p.y, p.x)
|
||||||
|
|
||||||
|
pp.multiply(&ypx, q.ypx)
|
||||||
|
mm.multiply(&ymx, q.ymx)
|
||||||
|
tt2d.multiply(p.t, q.t2d)
|
||||||
|
|
||||||
|
z2.add(p.z, p.z)
|
||||||
|
|
||||||
|
v.x.subtract(pp, mm)
|
||||||
|
v.y.add(pp, mm)
|
||||||
|
v.z.add(z2, tt2d)
|
||||||
|
v.t.subtract(z2, tt2d)
|
||||||
|
return v
|
||||||
|
}
|
||||||
|
|
||||||
|
fn (mut v ProjectiveP1) sub_affine(p Point, q AffineCached) ProjectiveP1 {
|
||||||
|
mut ypx := Element{}
|
||||||
|
mut ymx := Element{}
|
||||||
|
mut pp := Element{}
|
||||||
|
mut mm := Element{}
|
||||||
|
mut tt2d := Element{}
|
||||||
|
mut z2 := Element{}
|
||||||
|
|
||||||
|
ypx.add(p.y, p.x)
|
||||||
|
ymx.subtract(p.y, p.x)
|
||||||
|
|
||||||
|
pp.multiply(ypx, q.ymx) // flipped sign
|
||||||
|
mm.multiply(ymx, q.ypx) // flipped sign
|
||||||
|
tt2d.multiply(p.t, q.t2d)
|
||||||
|
|
||||||
|
z2.add(p.z, p.z)
|
||||||
|
|
||||||
|
v.x.subtract(pp, mm)
|
||||||
|
v.y.add(pp, mm)
|
||||||
|
v.z.subtract(z2, tt2d) // flipped sign
|
||||||
|
v.t.add(z2, tt2d) // flipped sign
|
||||||
|
return v
|
||||||
|
}
|
||||||
|
|
||||||
|
// Doubling.
|
||||||
|
|
||||||
|
fn (mut v ProjectiveP1) double(p ProjectiveP2) ProjectiveP1 {
|
||||||
|
// var xx, yy, zz2, xplusysq edwards25519.Element
|
||||||
|
mut xx := Element{}
|
||||||
|
mut yy := Element{}
|
||||||
|
mut zz2 := Element{}
|
||||||
|
mut xplusysq := Element{}
|
||||||
|
|
||||||
|
xx.square(p.x)
|
||||||
|
yy.square(p.y)
|
||||||
|
zz2.square(p.z)
|
||||||
|
zz2.add(zz2, zz2)
|
||||||
|
xplusysq.add(p.x, p.y)
|
||||||
|
xplusysq.square(xplusysq)
|
||||||
|
|
||||||
|
v.y.add(yy, xx)
|
||||||
|
v.z.subtract(yy, xx)
|
||||||
|
|
||||||
|
v.x.subtract(xplusysq, v.y)
|
||||||
|
v.t.subtract(zz2, v.z)
|
||||||
|
return v
|
||||||
|
}
|
||||||
|
|
||||||
|
// Negation.
|
||||||
|
|
||||||
|
// `negate` sets v = -p, and returns v.
|
||||||
|
pub fn (mut v Point) negate(p Point) Point {
|
||||||
|
check_initialized(p)
|
||||||
|
v.x.negate(p.x)
|
||||||
|
v.y.set(p.y)
|
||||||
|
v.z.set(p.z)
|
||||||
|
v.t.negate(p.t)
|
||||||
|
return v
|
||||||
|
}
|
||||||
|
|
||||||
|
// `equal` returns 1 if v is equivalent to u, and 0 otherwise.
|
||||||
|
pub fn (mut v Point) equal(u Point) int {
|
||||||
|
check_initialized(v, u)
|
||||||
|
|
||||||
|
mut t1 := Element{}
|
||||||
|
mut t2 := Element{}
|
||||||
|
mut t3 := Element{}
|
||||||
|
mut t4 := Element{}
|
||||||
|
|
||||||
|
t1.multiply(v.x, u.z)
|
||||||
|
t2.multiply(u.x, v.z)
|
||||||
|
t3.multiply(v.y, u.z)
|
||||||
|
t4.multiply(u.y, v.z)
|
||||||
|
|
||||||
|
return t1.equal(t2) & t3.equal(t4)
|
||||||
|
}
|
||||||
|
|
||||||
|
// Constant-time operations
|
||||||
|
|
||||||
|
// selected sets v to a if cond == 1 and to b if cond == 0.
|
||||||
|
fn (mut v ProjectiveCached) selected(a ProjectiveCached, b ProjectiveCached, cond int) ProjectiveCached {
|
||||||
|
v.ypx.selected(a.ypx, b.ypx, cond)
|
||||||
|
v.ymx.selected(a.ymx, b.ymx, cond)
|
||||||
|
v.z.selected(a.z, b.z, cond)
|
||||||
|
v.t2d.selected(a.t2d, b.t2d, cond)
|
||||||
|
return v
|
||||||
|
}
|
||||||
|
|
||||||
|
// selected sets v to a if cond == 1 and to b if cond == 0.
|
||||||
|
fn (mut v AffineCached) selected(a AffineCached, b AffineCached, cond int) AffineCached {
|
||||||
|
v.ypx.selected(a.ypx, b.ypx, cond)
|
||||||
|
v.ymx.selected(a.ymx, b.ymx, cond)
|
||||||
|
v.t2d.selected(a.t2d, b.t2d, cond)
|
||||||
|
return v
|
||||||
|
}
|
||||||
|
|
||||||
|
// cond_neg negates v if cond == 1 and leaves it unchanged if cond == 0.
|
||||||
|
fn (mut v ProjectiveCached) cond_neg(cond int) ProjectiveCached {
|
||||||
|
mut el := Element{}
|
||||||
|
v.ypx.swap(mut v.ymx, cond)
|
||||||
|
v.t2d.selected(el.negate(v.t2d), v.t2d, cond)
|
||||||
|
return v
|
||||||
|
}
|
||||||
|
|
||||||
|
// cond_neg negates v if cond == 1 and leaves it unchanged if cond == 0.
|
||||||
|
fn (mut v AffineCached) cond_neg(cond int) AffineCached {
|
||||||
|
mut el := Element{}
|
||||||
|
v.ypx.swap(mut v.ymx, cond)
|
||||||
|
v.t2d.selected(el.negate(v.t2d), v.t2d, cond)
|
||||||
|
return v
|
||||||
|
}
|
||||||
|
|
||||||
|
fn check_on_curve(points ...Point) bool {
|
||||||
|
for p in points {
|
||||||
|
mut xx := Element{}
|
||||||
|
mut yy := Element{}
|
||||||
|
mut zz := Element{}
|
||||||
|
mut zzzz := Element{}
|
||||||
|
xx.square(p.x)
|
||||||
|
yy.square(p.y)
|
||||||
|
zz.square(p.z)
|
||||||
|
zzzz.square(zz)
|
||||||
|
// -x² + y² = 1 + dx²y²
|
||||||
|
// -(X/Z)² + (Y/Z)² = 1 + d(X/Z)²(Y/Z)²
|
||||||
|
// (-X² + Y²)/Z² = 1 + (dX²Y²)/Z⁴
|
||||||
|
// (-X² + Y²)*Z² = Z⁴ + dX²Y²
|
||||||
|
mut lhs := Element{}
|
||||||
|
mut rhs := Element{}
|
||||||
|
lhs.subtract(yy, xx)
|
||||||
|
lhs.multiply(lhs, zz)
|
||||||
|
rhs.multiply(edwards25519.d_const, xx)
|
||||||
|
rhs.multiply(rhs, yy)
|
||||||
|
rhs.add(rhs, zzzz)
|
||||||
|
|
||||||
|
if lhs.equal(rhs) != 1 {
|
||||||
|
return false
|
||||||
|
}
|
||||||
|
/*
|
||||||
|
if lhs.equal(rhs) != 1 {
|
||||||
|
lg.error('X, Y, and Z do not specify a point on the curve\nX = $p.x \nY = $p.y\nZ = $p.z')
|
||||||
|
}*/
|
||||||
|
|
||||||
|
// xy = T/Z
|
||||||
|
lhs.multiply(p.x, p.y)
|
||||||
|
rhs.multiply(p.z, p.t)
|
||||||
|
/*
|
||||||
|
if lhs.equal(rhs) != 1 {
|
||||||
|
lg.error('point $i is not valid\nX = $p.x\nY = $p.y\nZ = $p.z')
|
||||||
|
}*/
|
||||||
|
if lhs.equal(rhs) != 1 {
|
||||||
|
return false
|
||||||
|
}
|
||||||
|
}
|
||||||
|
return true
|
||||||
|
}
|
125
vlib/crypto/ed25519/internal/edwards25519/point_test.v
Normal file
125
vlib/crypto/ed25519/internal/edwards25519/point_test.v
Normal file
@ -0,0 +1,125 @@
|
|||||||
|
module edwards25519
|
||||||
|
|
||||||
|
import encoding.hex
|
||||||
|
|
||||||
|
const zero_point = Point{fe_zero, fe_zero, fe_zero, fe_zero}
|
||||||
|
|
||||||
|
fn test_invalid_encodings() ? {
|
||||||
|
// An invalid point, that also happens to have y > p.
|
||||||
|
invalid := 'efffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff7f'
|
||||||
|
inv_bytes := hex.decode(invalid) or { panic(err) }
|
||||||
|
mut p := new_generator_point()
|
||||||
|
|
||||||
|
out := p.set_bytes(inv_bytes) or { edwards25519.zero_point }
|
||||||
|
assert out == edwards25519.zero_point
|
||||||
|
// assert p.equal(bgp) == 1 //not makes sense when error
|
||||||
|
|
||||||
|
assert check_on_curve(p) == true
|
||||||
|
}
|
||||||
|
|
||||||
|
fn test_add_sub_neg_on_basepoint() ? {
|
||||||
|
bgp := new_generator_point()
|
||||||
|
mut idp := new_identity_point()
|
||||||
|
mut checklhs := Point{}
|
||||||
|
mut checkrhs := Point{}
|
||||||
|
|
||||||
|
checklhs.add(bgp, bgp)
|
||||||
|
|
||||||
|
mut proj_p1 := ProjectiveP1{}
|
||||||
|
mut proj_p2 := ProjectiveP2{}
|
||||||
|
|
||||||
|
tmp_p2 := proj_p2.from_p3(bgp)
|
||||||
|
tmp_p1 := proj_p1.double(tmp_p2)
|
||||||
|
checkrhs.from_p1(tmp_p1)
|
||||||
|
|
||||||
|
assert checklhs.equal(checkrhs) == 1
|
||||||
|
assert check_on_curve(checklhs, checkrhs) == true
|
||||||
|
|
||||||
|
checklhs.subtract(bgp, bgp)
|
||||||
|
mut p0 := Point{}
|
||||||
|
bneg := p0.negate(bgp)
|
||||||
|
checkrhs.add(bgp, bneg)
|
||||||
|
|
||||||
|
assert checklhs.equal(checkrhs) == 1
|
||||||
|
assert idp.equal(checklhs) == 1
|
||||||
|
assert idp.equal(checkrhs) == 1
|
||||||
|
assert check_on_curve(checklhs, checkrhs, bneg) == true
|
||||||
|
}
|
||||||
|
|
||||||
|
struct NonCanonicalTest {
|
||||||
|
name string
|
||||||
|
encoding string
|
||||||
|
canonical string
|
||||||
|
}
|
||||||
|
|
||||||
|
fn test_non_canonical_points() ? {
|
||||||
|
tests := [
|
||||||
|
// Points with x = 0 and the sign bit set. With x = 0 the curve equation
|
||||||
|
// gives y² = 1, so y = ±1. 1 has two valid encodings.
|
||||||
|
NonCanonicalTest{'y=1,sign-', '0100000000000000000000000000000000000000000000000000000000000080', '0100000000000000000000000000000000000000000000000000000000000000'},
|
||||||
|
NonCanonicalTest{'y=p+1,sign-', 'eeffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff', '0100000000000000000000000000000000000000000000000000000000000000'},
|
||||||
|
NonCanonicalTest{'y=p-1,sign-', 'ecffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff', 'ecffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff7f'},
|
||||||
|
// Non-canonical y encodings with values 2²⁵⁵-19 (p) to 2²⁵⁵-1 (p+18).
|
||||||
|
NonCanonicalTest{'y=p,sign+', 'edffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff7f', '0000000000000000000000000000000000000000000000000000000000000000'},
|
||||||
|
NonCanonicalTest{'y=p,sign-', 'edffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff', '0000000000000000000000000000000000000000000000000000000000000080'},
|
||||||
|
NonCanonicalTest{'y=p+1,sign+', 'eeffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff7f', '0100000000000000000000000000000000000000000000000000000000000000'},
|
||||||
|
// "y=p+1,sign-" is already tested above.
|
||||||
|
// p+2 is not a valid y-coordinate.
|
||||||
|
NonCanonicalTest{'y=p+3,sign+', 'f0ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff7f', '0300000000000000000000000000000000000000000000000000000000000000'},
|
||||||
|
NonCanonicalTest{'y=p+3,sign-', 'f0ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff', '0300000000000000000000000000000000000000000000000000000000000080'},
|
||||||
|
NonCanonicalTest{'y=p+4,sign+', 'f1ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff7f', '0400000000000000000000000000000000000000000000000000000000000000'},
|
||||||
|
NonCanonicalTest{'y=p+4,sign-', 'f1ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff', '0400000000000000000000000000000000000000000000000000000000000080'},
|
||||||
|
NonCanonicalTest{'y=p+5,sign+', 'f2ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff7f', '0500000000000000000000000000000000000000000000000000000000000000'},
|
||||||
|
NonCanonicalTest{'y=p+5,sign-', 'f2ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff', '0500000000000000000000000000000000000000000000000000000000000080'},
|
||||||
|
NonCanonicalTest{'y=p+6,sign+', 'f3ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff7f', '0600000000000000000000000000000000000000000000000000000000000000'},
|
||||||
|
NonCanonicalTest{'y=p+6,sign-', 'f3ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff', '0600000000000000000000000000000000000000000000000000000000000080'},
|
||||||
|
// p+7 is not a valid y-coordinate.
|
||||||
|
// p+8 is not a valid y-coordinate.
|
||||||
|
NonCanonicalTest{'y=p+9,sign+', 'f6ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff7f', '0900000000000000000000000000000000000000000000000000000000000000'},
|
||||||
|
NonCanonicalTest{'y=p+9,sign-', 'f6ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff', '0900000000000000000000000000000000000000000000000000000000000080'},
|
||||||
|
NonCanonicalTest{'y=p+10,sign+', 'f7ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff7f', '0a00000000000000000000000000000000000000000000000000000000000000'},
|
||||||
|
NonCanonicalTest{'y=p+10,sign-', 'f7ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff', '0a00000000000000000000000000000000000000000000000000000000000080'},
|
||||||
|
// p+11 is not a valid y-coordinate.
|
||||||
|
// p+12 is not a valid y-coordinate.
|
||||||
|
// p+13 is not a valid y-coordinate.
|
||||||
|
NonCanonicalTest{'y=p+14,sign+', 'fbffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff7f', '0e00000000000000000000000000000000000000000000000000000000000000'},
|
||||||
|
NonCanonicalTest{'y=p+14,sign-', 'fbffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff', '0e00000000000000000000000000000000000000000000000000000000000080'},
|
||||||
|
NonCanonicalTest{'y=p+15,sign+', 'fcffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff7f', '0f00000000000000000000000000000000000000000000000000000000000000'},
|
||||||
|
NonCanonicalTest{'y=p+15,sign-', 'fcffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff', '0f00000000000000000000000000000000000000000000000000000000000080'},
|
||||||
|
NonCanonicalTest{'y=p+16,sign+', 'fdffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff7f', '1000000000000000000000000000000000000000000000000000000000000000'},
|
||||||
|
NonCanonicalTest{'y=p+16,sign-', 'fdffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff', '1000000000000000000000000000000000000000000000000000000000000080'},
|
||||||
|
// p+17 is not a valid y-coordinate.
|
||||||
|
NonCanonicalTest{'y=p+18,sign+', 'ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff7f', '1200000000000000000000000000000000000000000000000000000000000000'},
|
||||||
|
NonCanonicalTest{'y=p+18,sign-', 'ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff', '1200000000000000000000000000000000000000000000000000000000000080'},
|
||||||
|
]
|
||||||
|
for tt in tests {
|
||||||
|
// t.Run(tt.name, func(t *testing.T) {
|
||||||
|
// p1, err := new(Point).SetBytes(decodeHex(tt.encoding))
|
||||||
|
mut p1 := Point{}
|
||||||
|
p1.set_bytes(hex.decode(tt.encoding) ?) ?
|
||||||
|
|
||||||
|
// p2, err := new(Point).SetBytes(decodeHex(tt.canonical))
|
||||||
|
mut p2 := Point{}
|
||||||
|
p2.set_bytes(hex.decode(tt.canonical) ?) ?
|
||||||
|
|
||||||
|
assert p1.equal(p2) == 1
|
||||||
|
assert p1.bytes() == p2.bytes()
|
||||||
|
assert hex.encode(p1.bytes()) == tt.canonical // NEED FIX!
|
||||||
|
|
||||||
|
assert check_on_curve(p1, p2) == true
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
fn test_generator() {
|
||||||
|
// These are the coordinates of B from RFC 8032, Section 5.1, converted to
|
||||||
|
// little endian hex.
|
||||||
|
x := '1ad5258f602d56c9b2a7259560c72c695cdcd6fd31e2a4c0fe536ecdd3366921'
|
||||||
|
y := '5866666666666666666666666666666666666666666666666666666666666666'
|
||||||
|
mut b := new_generator_point()
|
||||||
|
|
||||||
|
assert hex.encode(b.x.bytes()) == x
|
||||||
|
assert hex.encode(b.y.bytes()) == y
|
||||||
|
assert b.z.equal(fe_one) == 1
|
||||||
|
// Check that t is correct.
|
||||||
|
assert check_on_curve(b) == true
|
||||||
|
}
|
1173
vlib/crypto/ed25519/internal/edwards25519/scalar.v
Normal file
1173
vlib/crypto/ed25519/internal/edwards25519/scalar.v
Normal file
File diff suppressed because it is too large
Load Diff
106
vlib/crypto/ed25519/internal/edwards25519/scalar_alias_test.v
Normal file
106
vlib/crypto/ed25519/internal/edwards25519/scalar_alias_test.v
Normal file
@ -0,0 +1,106 @@
|
|||||||
|
module edwards25519
|
||||||
|
|
||||||
|
fn check_aliasing_onearg(f fn (mut v Scalar, x Scalar) Scalar, mut v Scalar, x Scalar) bool {
|
||||||
|
x1, mut v1 := x, x
|
||||||
|
|
||||||
|
// Calculate a reference f(x) without aliasing.
|
||||||
|
mut out := f(mut v, x)
|
||||||
|
if out != v || !is_reduced(out) {
|
||||||
|
return false
|
||||||
|
}
|
||||||
|
|
||||||
|
// Test aliasing the argument and the receiver.
|
||||||
|
out2 := f(mut v1, v1)
|
||||||
|
if out2 != v1 || v1 != v || !is_reduced(out2) {
|
||||||
|
return false
|
||||||
|
}
|
||||||
|
|
||||||
|
// Ensure the arguments was not modified.
|
||||||
|
return x == x1
|
||||||
|
}
|
||||||
|
|
||||||
|
fn negate_aliasing(mut v Scalar, x Scalar) Scalar {
|
||||||
|
// mut t := v
|
||||||
|
return v.negate(x)
|
||||||
|
}
|
||||||
|
|
||||||
|
fn test_check_aliasing_oneargs() ? {
|
||||||
|
x := generate_notzero_scalar(10) ?
|
||||||
|
mut v := generate_notzero_scalar(10) ?
|
||||||
|
out := check_aliasing_onearg(negate_aliasing, mut v, x)
|
||||||
|
assert out == true
|
||||||
|
}
|
||||||
|
|
||||||
|
fn multiply_aliasing(mut v Scalar, x Scalar, y Scalar) Scalar {
|
||||||
|
return v.multiply(x, y)
|
||||||
|
}
|
||||||
|
|
||||||
|
fn add_aliasing(mut v Scalar, x Scalar, y Scalar) Scalar {
|
||||||
|
return v.add(x, y)
|
||||||
|
}
|
||||||
|
|
||||||
|
fn subtract_aliasing(mut v Scalar, x Scalar, y Scalar) Scalar {
|
||||||
|
return v.subtract(x, y)
|
||||||
|
}
|
||||||
|
|
||||||
|
fn test_check_aliasing_twoargs() ? {
|
||||||
|
fn_with_twoargs := [add_aliasing, multiply_aliasing, subtract_aliasing]
|
||||||
|
for f in fn_with_twoargs {
|
||||||
|
mut v := generate_notzero_scalar(10) ?
|
||||||
|
x := generate_notzero_scalar(10) ?
|
||||||
|
y := generate_notzero_scalar(10) ?
|
||||||
|
out := check_aliasing_twoargs(f, mut v, x, y)
|
||||||
|
assert out == true
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
fn check_aliasing_twoargs(f fn (mut v Scalar, x Scalar, y Scalar) Scalar, mut v Scalar, x Scalar, y Scalar) bool {
|
||||||
|
x1, y1, mut v1 := x, y, Scalar{}
|
||||||
|
|
||||||
|
// Calculate a reference f(x, y) without aliasing.
|
||||||
|
mut out := f(mut v, x, y)
|
||||||
|
if out != v || !is_reduced(out) {
|
||||||
|
return false
|
||||||
|
}
|
||||||
|
|
||||||
|
// Test aliasing the first argument and the receiver.
|
||||||
|
v1 = x
|
||||||
|
out2 := f(mut v1, v1, y)
|
||||||
|
if out2 != v1 || v1 != v || !is_reduced(out2) {
|
||||||
|
return false
|
||||||
|
}
|
||||||
|
// Test aliasing the second argument and the receiver.
|
||||||
|
v1 = y
|
||||||
|
out3 := f(mut v1, x, v1)
|
||||||
|
if out3 != v1 || v1 != v || !is_reduced(out3) {
|
||||||
|
return false
|
||||||
|
}
|
||||||
|
|
||||||
|
// Calculate a reference f(x, x) without aliasing.
|
||||||
|
out4 := f(mut v, x, x)
|
||||||
|
if out4 != v || !is_reduced(out4) {
|
||||||
|
return false
|
||||||
|
}
|
||||||
|
|
||||||
|
// Test aliasing the first argument and the receiver.
|
||||||
|
v1 = x
|
||||||
|
out5 := f(mut v1, v1, x)
|
||||||
|
if out5 != v1 || v1 != v || !is_reduced(out5) {
|
||||||
|
return false
|
||||||
|
}
|
||||||
|
// Test aliasing the second argument and the receiver.
|
||||||
|
v1 = x
|
||||||
|
out6 := f(mut v1, x, v1)
|
||||||
|
if out6 != v1 || v1 != v || !is_reduced(out6) {
|
||||||
|
return false
|
||||||
|
}
|
||||||
|
// Test aliasing both arguments and the receiver.
|
||||||
|
v1 = x
|
||||||
|
out7 := f(mut v1, v1, v1)
|
||||||
|
if out7 != v1 || v1 != v || !is_reduced(out7) {
|
||||||
|
return false
|
||||||
|
}
|
||||||
|
|
||||||
|
// Ensure the arguments were not modified.
|
||||||
|
return x == x1 && y == y1
|
||||||
|
}
|
210
vlib/crypto/ed25519/internal/edwards25519/scalar_test.v
Normal file
210
vlib/crypto/ed25519/internal/edwards25519/scalar_test.v
Normal file
@ -0,0 +1,210 @@
|
|||||||
|
module edwards25519
|
||||||
|
|
||||||
|
import os
|
||||||
|
import rand
|
||||||
|
import encoding.hex
|
||||||
|
import math.big
|
||||||
|
|
||||||
|
const github_job = os.getenv('GITHUB_JOB')
|
||||||
|
|
||||||
|
fn testsuite_begin() {
|
||||||
|
if edwards25519.github_job != '' {
|
||||||
|
// ensure that the CI does not run flaky tests:
|
||||||
|
rand.seed([u32(0xffff24), 0xabcd])
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
fn test_scalar_equal() {
|
||||||
|
assert sc_one.equal(sc_minus_one) != 1
|
||||||
|
|
||||||
|
assert sc_minus_one.equal(sc_minus_one) != 0
|
||||||
|
}
|
||||||
|
|
||||||
|
fn test_scalar_non_adjacent_form() {
|
||||||
|
mut s := Scalar{
|
||||||
|
s: [byte(0x1a), 0x0e, 0x97, 0x8a, 0x90, 0xf6, 0x62, 0x2d, 0x37, 0x47, 0x02, 0x3f, 0x8a,
|
||||||
|
0xd8, 0x26, 0x4d, 0xa7, 0x58, 0xaa, 0x1b, 0x88, 0xe0, 0x40, 0xd1, 0x58, 0x9e, 0x7b,
|
||||||
|
0x7f, 0x23, 0x76, 0xef, 0x09]!
|
||||||
|
}
|
||||||
|
expected_naf := [i8(0), 13, 0, 0, 0, 0, 0, 0, 0, 7, 0, 0, 0, 0, 0, 0, -9, 0, 0, 0, 0, -11,
|
||||||
|
0, 0, 0, 0, 3, 0, 0, 0, 0, 1, 0, 0, 0, 0, 9, 0, 0, 0, 0, -5, 0, 0, 0, 0, 0, 0, 3, 0, 0,
|
||||||
|
0, 0, 11, 0, 0, 0, 0, 11, 0, 0, 0, 0, 0, -9, 0, 0, 0, 0, 0, -3, 0, 0, 0, 0, 9, 0, 0, 0,
|
||||||
|
0, 0, 1, 0, 0, 0, 0, 0, 0, -1, 0, 0, 0, 0, 0, 9, 0, 0, 0, 0, -15, 0, 0, 0, 0, -7, 0, 0,
|
||||||
|
0, 0, -9, 0, 0, 0, 0, 0, 5, 0, 0, 0, 0, 13, 0, 0, 0, 0, 0, -3, 0, 0, 0, 0, -11, 0, 0, 0,
|
||||||
|
0, -7, 0, 0, 0, 0, -13, 0, 0, 0, 0, 11, 0, 0, 0, 0, -9, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0,
|
||||||
|
-15, 0, 0, 0, 0, 1, 0, 0, 0, 0, 7, 0, 0, 0, 0, 0, 0, 0, 0, 5, 0, 0, 0, 0, 0, 13, 0, 0,
|
||||||
|
0, 0, 0, 0, 11, 0, 0, 0, 0, 0, 15, 0, 0, 0, 0, 0, -9, 0, 0, 0, 0, 0, 0, 0, -1, 0, 0, 0,
|
||||||
|
0, 0, 0, 0, 7, 0, 0, 0, 0, 0, -15, 0, 0, 0, 0, 0, 15, 0, 0, 0, 0, 15, 0, 0, 0, 0, 15, 0,
|
||||||
|
0, 0, 0, 0, 1, 0, 0, 0, 0]
|
||||||
|
|
||||||
|
snaf := s.non_adjacent_form(5)
|
||||||
|
for i := 0; i < 256; i++ {
|
||||||
|
assert expected_naf[i] == snaf[i]
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
fn addlike_subneg(x Scalar, y Scalar) bool {
|
||||||
|
// Compute t1 = x - y
|
||||||
|
mut t1 := Scalar{}
|
||||||
|
t1.subtract(x, y)
|
||||||
|
|
||||||
|
// Compute t2 = -y + x
|
||||||
|
mut t2 := Scalar{}
|
||||||
|
t2.negate(y)
|
||||||
|
t2.add(t2, x)
|
||||||
|
|
||||||
|
return t1 == t2 && is_reduced(t1)
|
||||||
|
}
|
||||||
|
|
||||||
|
fn test_scalar_add_like_subneg() {
|
||||||
|
for i in 0 .. 15 {
|
||||||
|
x := generate_scalar(1000) or { panic(err.msg) }
|
||||||
|
y := generate_scalar(1000) or { panic(err.msg) }
|
||||||
|
assert addlike_subneg(x, y) == true
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
fn fg(sc Scalar) bool {
|
||||||
|
return is_reduced(sc)
|
||||||
|
}
|
||||||
|
|
||||||
|
fn test_scalar_generate() ? {
|
||||||
|
for i in 0 .. 15 {
|
||||||
|
sc := generate_scalar(1000) or { panic(err.msg) }
|
||||||
|
|
||||||
|
assert fg(sc) == true
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
//
|
||||||
|
fn test_scalar_set_canonical_bytes() ? {
|
||||||
|
for i in 0 .. 10 {
|
||||||
|
mut buf := rand.bytes(32) or { panic(err.msg) }
|
||||||
|
mut sc := generate_scalar(1000) or { panic(err.msg) }
|
||||||
|
buf[buf.len - 1] &= (1 << 4) - 1
|
||||||
|
sc = sc.set_canonical_bytes(buf) or { panic(err.msg) }
|
||||||
|
|
||||||
|
assert buf[..] == sc.bytes()
|
||||||
|
assert is_reduced(sc)
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
fn test_scalar_set_canonical_bytes_round_trip() ? {
|
||||||
|
for i in 0 .. 10 {
|
||||||
|
mut sc1 := generate_scalar(2) ?
|
||||||
|
mut sc2 := generate_scalar(6) ?
|
||||||
|
sc2.set_canonical_bytes(sc1.bytes()) or { panic(err.msg) }
|
||||||
|
|
||||||
|
assert sc1 == sc2
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
const (
|
||||||
|
sc_error = Scalar{
|
||||||
|
s: [32]byte{init: (byte(-1))}
|
||||||
|
}
|
||||||
|
)
|
||||||
|
|
||||||
|
fn test_scalar_set_canonical_bytes_on_noncanonical_value() ? {
|
||||||
|
mut b := sc_minus_one.s
|
||||||
|
b[31] += 1
|
||||||
|
|
||||||
|
mut s := sc_one
|
||||||
|
out := s.set_canonical_bytes(b[..]) or { edwards25519.sc_error } // set_canonical_bytes shouldn't worked on a non-canonical value"
|
||||||
|
assert out == edwards25519.sc_error
|
||||||
|
assert s == sc_one
|
||||||
|
}
|
||||||
|
|
||||||
|
fn test_scalar_set_uniform_bytes() ? {
|
||||||
|
// mod, _ := new(big.Integer).SetString("27742317777372353535851937790883648493", 10)
|
||||||
|
mut mod := big.integer_from_string('27742317777372353535851937790883648493') ?
|
||||||
|
// mod.Add(mod, new(big.Integer).Lsh(big.NewInt(1), 252))
|
||||||
|
mod = mod + big.integer_from_i64(1).lshift(252)
|
||||||
|
|
||||||
|
mut sc := generate_scalar(100) ?
|
||||||
|
inp := rand.bytes(64) ?
|
||||||
|
|
||||||
|
sc.set_uniform_bytes(inp[..]) ?
|
||||||
|
assert is_reduced(sc) == true
|
||||||
|
|
||||||
|
scbig := bigint_from_le_bytes(sc.s[..])
|
||||||
|
inbig := bigint_from_le_bytes(inp)
|
||||||
|
// return inbig.Mod(inbig, mod).Cmp(scbig) == 0
|
||||||
|
_, m := inbig.div_mod(mod)
|
||||||
|
assert m.abs_cmp(scbig) == 0 // NEED FIX
|
||||||
|
}
|
||||||
|
|
||||||
|
fn bigint_from_le_bytes(b []byte) big.Integer {
|
||||||
|
mut bc := b.clone()
|
||||||
|
buf := swap_endianness(mut bc) // WITHOUT THIS, some test would fail
|
||||||
|
bg := big.integer_from_bytes(buf)
|
||||||
|
return bg
|
||||||
|
}
|
||||||
|
|
||||||
|
fn test_scalar_set_bytes_with_clamping() {
|
||||||
|
// Generated with libsodium.js 1.0.18 crypto_scalarmult_ed25519_base.
|
||||||
|
/*
|
||||||
|
random := "633d368491364dc9cd4c1bf891b1d59460face1644813240a313e61f2c88216e"
|
||||||
|
s, _ := new(Scalar).SetBytesWithClamping(decodeHex(random))
|
||||||
|
p := new(Point).ScalarBaseMult(s)
|
||||||
|
want := "1d87a9026fd0126a5736fe1628c95dd419172b5b618457e041c9c861b2494a94"
|
||||||
|
if got := hex.EncodeToString(p.Bytes()); got != want {
|
||||||
|
t.Errorf("random: got %q, want %q", got, want)
|
||||||
|
}*/
|
||||||
|
random := '633d368491364dc9cd4c1bf891b1d59460face1644813240a313e61f2c88216e'
|
||||||
|
random_bytes := hex.decode(random) or { panic(err.msg) }
|
||||||
|
|
||||||
|
mut s0 := Scalar{}
|
||||||
|
s0.set_bytes_with_clamping(random_bytes) or { panic(err.msg) }
|
||||||
|
|
||||||
|
mut p0 := Point{}
|
||||||
|
p0.scalar_base_mult(mut s0)
|
||||||
|
|
||||||
|
want0 := '1d87a9026fd0126a5736fe1628c95dd419172b5b618457e041c9c861b2494a94'
|
||||||
|
got0 := hex.encode(p0.bytes())
|
||||||
|
|
||||||
|
assert got0 == want0
|
||||||
|
|
||||||
|
zero := '0000000000000000000000000000000000000000000000000000000000000000'
|
||||||
|
mut s1 := Scalar{}
|
||||||
|
zero_bytes := hex.decode(zero) or { panic(err.msg) }
|
||||||
|
s1.set_bytes_with_clamping(zero_bytes) or { panic(err.msg) }
|
||||||
|
mut p1 := Point{}
|
||||||
|
p1.scalar_base_mult(mut s1)
|
||||||
|
|
||||||
|
want1 := '693e47972caf527c7883ad1b39822f026f47db2ab0e1919955b8993aa04411d1'
|
||||||
|
got1 := hex.encode(p1.bytes())
|
||||||
|
assert want1 == got1
|
||||||
|
|
||||||
|
one := 'ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff'
|
||||||
|
mut s2 := Scalar{}
|
||||||
|
mut one_bytes := hex.decode(one) or { panic(err.msg) }
|
||||||
|
s2.set_bytes_with_clamping(one_bytes) or { panic(err.msg) }
|
||||||
|
mut p2 := Point{}
|
||||||
|
p2.scalar_base_mult(mut s2)
|
||||||
|
|
||||||
|
want2 := '12e9a68b73fd5aacdbcaf3e88c46fea6ebedb1aa84eed1842f07f8edab65e3a7'
|
||||||
|
got2 := hex.encode(p2.bytes())
|
||||||
|
|
||||||
|
assert want2 == got2
|
||||||
|
}
|
||||||
|
|
||||||
|
fn test_scalar_multiply_distributes_over_add() ? {
|
||||||
|
x := generate_scalar(100) ?
|
||||||
|
y := generate_scalar(100) ?
|
||||||
|
z := generate_scalar(100) ?
|
||||||
|
|
||||||
|
// Compute t1 = (x+y)*z
|
||||||
|
mut t1 := Scalar{}
|
||||||
|
t1.add(x, y)
|
||||||
|
t1.multiply(t1, z)
|
||||||
|
|
||||||
|
// Compute t2 = x*z + y*z
|
||||||
|
mut t2 := Scalar{}
|
||||||
|
mut t3 := Scalar{}
|
||||||
|
t2.multiply(x, z)
|
||||||
|
t3.multiply(y, z)
|
||||||
|
t2.add(t2, t3)
|
||||||
|
|
||||||
|
assert t1 == t2 && is_reduced(t1) && is_reduced(t3)
|
||||||
|
}
|
229
vlib/crypto/ed25519/internal/edwards25519/scalarmult.v
Normal file
229
vlib/crypto/ed25519/internal/edwards25519/scalarmult.v
Normal file
@ -0,0 +1,229 @@
|
|||||||
|
module edwards25519
|
||||||
|
|
||||||
|
import sync
|
||||||
|
|
||||||
|
struct BasepointTablePrecomp {
|
||||||
|
mut:
|
||||||
|
table []AffineLookupTable
|
||||||
|
initonce sync.Once
|
||||||
|
}
|
||||||
|
|
||||||
|
// `basepoint_table` is a set of 32 affineLookupTables, where table i is generated
|
||||||
|
// from 256i * basepoint. It is precomputed the first time it's used.
|
||||||
|
fn basepoint_table() []AffineLookupTable {
|
||||||
|
mut bpt := &BasepointTablePrecomp{
|
||||||
|
table: []AffineLookupTable{len: 32}
|
||||||
|
initonce: sync.new_once()
|
||||||
|
}
|
||||||
|
|
||||||
|
// replaced to use do_with_param on newest sync lib
|
||||||
|
/*
|
||||||
|
bpt.initonce.do(fn [mut bpt] () {
|
||||||
|
mut p := new_generator_point()
|
||||||
|
for i := 0; i < 32; i++ {
|
||||||
|
bpt.table[i].from_p3(p)
|
||||||
|
for j := 0; j < 8; j++ {
|
||||||
|
p.add(p, p)
|
||||||
|
}
|
||||||
|
}
|
||||||
|
})*/
|
||||||
|
bpt.initonce.do_with_param(fn (mut o BasepointTablePrecomp) {
|
||||||
|
mut p := new_generator_point()
|
||||||
|
for i := 0; i < 32; i++ {
|
||||||
|
o.table[i].from_p3(p)
|
||||||
|
for j := 0; j < 8; j++ {
|
||||||
|
p.add(p, p)
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}, bpt)
|
||||||
|
return bpt.table
|
||||||
|
}
|
||||||
|
|
||||||
|
// `scalar_base_mult` sets v = x * B, where B is the canonical generator, and
|
||||||
|
// returns v.
|
||||||
|
//
|
||||||
|
// The scalar multiplication is done in constant time.
|
||||||
|
pub fn (mut v Point) scalar_base_mult(mut x Scalar) Point {
|
||||||
|
mut bpt_table := basepoint_table()
|
||||||
|
|
||||||
|
// Write x = sum(x_i * 16^i) so x*B = sum( B*x_i*16^i )
|
||||||
|
// as described in the Ed25519 paper
|
||||||
|
//
|
||||||
|
// Group even and odd coefficients
|
||||||
|
// x*B = x_0*16^0*B + x_2*16^2*B + ... + x_62*16^62*B
|
||||||
|
// + x_1*16^1*B + x_3*16^3*B + ... + x_63*16^63*B
|
||||||
|
// x*B = x_0*16^0*B + x_2*16^2*B + ... + x_62*16^62*B
|
||||||
|
// + 16*( x_1*16^0*B + x_3*16^2*B + ... + x_63*16^62*B)
|
||||||
|
//
|
||||||
|
// We use a lookup table for each i to get x_i*16^(2*i)*B
|
||||||
|
// and do four doublings to multiply by 16.
|
||||||
|
digits := x.signed_radix16()
|
||||||
|
|
||||||
|
mut multiple := AffineCached{}
|
||||||
|
mut tmp1 := ProjectiveP1{}
|
||||||
|
mut tmp2 := ProjectiveP2{}
|
||||||
|
|
||||||
|
// Accumulate the odd components first
|
||||||
|
v.set(new_identity_point())
|
||||||
|
for i := 1; i < 64; i += 2 {
|
||||||
|
bpt_table[i / 2].select_into(mut multiple, digits[i])
|
||||||
|
tmp1.add_affine(v, multiple)
|
||||||
|
v.from_p1(tmp1)
|
||||||
|
}
|
||||||
|
|
||||||
|
// Multiply by 16
|
||||||
|
tmp2.from_p3(v) // tmp2 = v in P2 coords
|
||||||
|
tmp1.double(tmp2) // tmp1 = 2*v in P1xP1 coords
|
||||||
|
tmp2.from_p1(tmp1) // tmp2 = 2*v in P2 coords
|
||||||
|
tmp1.double(tmp2) // tmp1 = 4*v in P1xP1 coords
|
||||||
|
tmp2.from_p1(tmp1) // tmp2 = 4*v in P2 coords
|
||||||
|
tmp1.double(tmp2) // tmp1 = 8*v in P1xP1 coords
|
||||||
|
tmp2.from_p1(tmp1) // tmp2 = 8*v in P2 coords
|
||||||
|
tmp1.double(tmp2) // tmp1 = 16*v in P1xP1 coords
|
||||||
|
v.from_p1(tmp1) // now v = 16*(odd components)
|
||||||
|
|
||||||
|
// Accumulate the even components
|
||||||
|
for j := 0; j < 64; j += 2 {
|
||||||
|
bpt_table[j / 2].select_into(mut multiple, digits[j])
|
||||||
|
tmp1.add_affine(v, multiple)
|
||||||
|
v.from_p1(tmp1)
|
||||||
|
}
|
||||||
|
|
||||||
|
return v
|
||||||
|
}
|
||||||
|
|
||||||
|
// `scalar_mult` sets v = x * q, and returns v.
|
||||||
|
//
|
||||||
|
// The scalar multiplication is done in constant time.
|
||||||
|
pub fn (mut v Point) scalar_mult(mut x Scalar, q Point) Point {
|
||||||
|
check_initialized(q)
|
||||||
|
|
||||||
|
mut table := ProjLookupTable{}
|
||||||
|
table.from_p3(q)
|
||||||
|
|
||||||
|
// Write x = sum(x_i * 16^i)
|
||||||
|
// so x*Q = sum( Q*x_i*16^i )
|
||||||
|
// = Q*x_0 + 16*(Q*x_1 + 16*( ... + Q*x_63) ... )
|
||||||
|
// <------compute inside out---------
|
||||||
|
//
|
||||||
|
// We use the lookup table to get the x_i*Q values
|
||||||
|
// and do four doublings to compute 16*Q
|
||||||
|
digits := x.signed_radix16()
|
||||||
|
|
||||||
|
// Unwrap first loop iteration to save computing 16*identity
|
||||||
|
mut multiple := ProjectiveCached{}
|
||||||
|
mut tmp1 := ProjectiveP1{}
|
||||||
|
mut tmp2 := ProjectiveP2{}
|
||||||
|
table.select_into(mut multiple, digits[63])
|
||||||
|
|
||||||
|
v.set(new_identity_point())
|
||||||
|
tmp1.add(v, multiple) // tmp1 = x_63*Q in P1xP1 coords
|
||||||
|
for i := 62; i >= 0; i-- {
|
||||||
|
tmp2.from_p1(tmp1) // tmp2 = (prev) in P2 coords
|
||||||
|
tmp1.double(tmp2) // tmp1 = 2*(prev) in P1xP1 coords
|
||||||
|
tmp2.from_p1(tmp1) // tmp2 = 2*(prev) in P2 coords
|
||||||
|
tmp1.double(tmp2) // tmp1 = 4*(prev) in P1xP1 coords
|
||||||
|
tmp2.from_p1(tmp1) // tmp2 = 4*(prev) in P2 coords
|
||||||
|
tmp1.double(tmp2) // tmp1 = 8*(prev) in P1xP1 coords
|
||||||
|
tmp2.from_p1(tmp1) // tmp2 = 8*(prev) in P2 coords
|
||||||
|
tmp1.double(tmp2) // tmp1 = 16*(prev) in P1xP1 coords
|
||||||
|
v.from_p1(tmp1) // v = 16*(prev) in P3 coords
|
||||||
|
table.select_into(mut multiple, digits[i])
|
||||||
|
tmp1.add(v, multiple) // tmp1 = x_i*Q + 16*(prev) in P1xP1 coords
|
||||||
|
}
|
||||||
|
v.from_p1(tmp1)
|
||||||
|
return v
|
||||||
|
}
|
||||||
|
|
||||||
|
struct BasepointNaftablePrecomp {
|
||||||
|
mut:
|
||||||
|
table NafLookupTable8
|
||||||
|
initonce sync.Once
|
||||||
|
}
|
||||||
|
|
||||||
|
fn basepoint_naf_table() NafLookupTable8 {
|
||||||
|
mut bnft := &BasepointNaftablePrecomp{}
|
||||||
|
bnft.initonce.do_with_param(fn (mut o BasepointNaftablePrecomp) {
|
||||||
|
o.table.from_p3(new_generator_point())
|
||||||
|
}, bnft)
|
||||||
|
return bnft.table
|
||||||
|
}
|
||||||
|
|
||||||
|
// `vartime_double_scalar_base_mult` sets v = a * A + b * B, where B is the canonical
|
||||||
|
// generator, and returns v.
|
||||||
|
//
|
||||||
|
// Execution time depends on the inputs.
|
||||||
|
pub fn (mut v Point) vartime_double_scalar_base_mult(xa Scalar, aa Point, xb Scalar) Point {
|
||||||
|
check_initialized(aa)
|
||||||
|
|
||||||
|
// Similarly to the single variable-base approach, we compute
|
||||||
|
// digits and use them with a lookup table. However, because
|
||||||
|
// we are allowed to do variable-time operations, we don't
|
||||||
|
// need constant-time lookups or constant-time digit
|
||||||
|
// computations.
|
||||||
|
//
|
||||||
|
// So we use a non-adjacent form of some width w instead of
|
||||||
|
// radix 16. This is like a binary representation (one digit
|
||||||
|
// for each binary place) but we allow the digits to grow in
|
||||||
|
// magnitude up to 2^{w-1} so that the nonzero digits are as
|
||||||
|
// sparse as possible. Intuitively, this "condenses" the
|
||||||
|
// "mass" of the scalar onto sparse coefficients (meaning
|
||||||
|
// fewer additions).
|
||||||
|
|
||||||
|
mut bp_naftable := basepoint_naf_table()
|
||||||
|
mut atable := NafLookupTable5{}
|
||||||
|
atable.from_p3(aa)
|
||||||
|
// Because the basepoint is fixed, we can use a wider NAF
|
||||||
|
// corresponding to a bigger table.
|
||||||
|
mut a := xa
|
||||||
|
mut b := xb
|
||||||
|
anaf := a.non_adjacent_form(5)
|
||||||
|
bnaf := b.non_adjacent_form(8)
|
||||||
|
|
||||||
|
// Find the first nonzero coefficient.
|
||||||
|
mut i := 255
|
||||||
|
for j := i; j >= 0; j-- {
|
||||||
|
if anaf[j] != 0 || bnaf[j] != 0 {
|
||||||
|
break
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
mut multa := ProjectiveCached{}
|
||||||
|
mut multb := AffineCached{}
|
||||||
|
mut tmp1 := ProjectiveP1{}
|
||||||
|
mut tmp2 := ProjectiveP2{}
|
||||||
|
tmp2.zero()
|
||||||
|
|
||||||
|
// Move from high to low bits, doubling the accumulator
|
||||||
|
// at each iteration and checking whether there is a nonzero
|
||||||
|
// coefficient to look up a multiple of.
|
||||||
|
for ; i >= 0; i-- {
|
||||||
|
tmp1.double(tmp2)
|
||||||
|
|
||||||
|
// Only update v if we have a nonzero coeff to add in.
|
||||||
|
if anaf[i] > 0 {
|
||||||
|
v.from_p1(tmp1)
|
||||||
|
atable.select_into(mut multa, anaf[i])
|
||||||
|
tmp1.add(v, multa)
|
||||||
|
} else if anaf[i] < 0 {
|
||||||
|
v.from_p1(tmp1)
|
||||||
|
atable.select_into(mut multa, -anaf[i])
|
||||||
|
tmp1.sub(v, multa)
|
||||||
|
}
|
||||||
|
|
||||||
|
if bnaf[i] > 0 {
|
||||||
|
v.from_p1(tmp1)
|
||||||
|
bp_naftable.select_into(mut multb, bnaf[i])
|
||||||
|
tmp1.add_affine(v, multb)
|
||||||
|
} else if bnaf[i] < 0 {
|
||||||
|
v.from_p1(tmp1)
|
||||||
|
bp_naftable.select_into(mut multb, -bnaf[i])
|
||||||
|
tmp1.sub_affine(v, multb)
|
||||||
|
}
|
||||||
|
|
||||||
|
tmp2.from_p1(tmp1)
|
||||||
|
}
|
||||||
|
|
||||||
|
v.from_p2(tmp2)
|
||||||
|
return v
|
||||||
|
}
|
185
vlib/crypto/ed25519/internal/edwards25519/scalarmult_test.v
Normal file
185
vlib/crypto/ed25519/internal/edwards25519/scalarmult_test.v
Normal file
@ -0,0 +1,185 @@
|
|||||||
|
module edwards25519
|
||||||
|
|
||||||
|
const (
|
||||||
|
dalek_scalar = Scalar{[byte(219), 106, 114, 9, 174, 249, 155, 89, 69, 203, 201, 93, 92, 116,
|
||||||
|
234, 187, 78, 115, 103, 172, 182, 98, 62, 103, 187, 136, 13, 100, 248, 110, 12, 4]!}
|
||||||
|
dsc_basepoint = [byte(0xf4), 0xef, 0x7c, 0xa, 0x34, 0x55, 0x7b, 0x9f, 0x72, 0x3b, 0xb6, 0x1e,
|
||||||
|
0xf9, 0x46, 0x9, 0x91, 0x1c, 0xb9, 0xc0, 0x6c, 0x17, 0x28, 0x2d, 0x8b, 0x43, 0x2b, 0x5,
|
||||||
|
0x18, 0x6a, 0x54, 0x3e, 0x48]
|
||||||
|
)
|
||||||
|
|
||||||
|
fn dalek_scalar_basepoint() Point {
|
||||||
|
mut p := Point{}
|
||||||
|
p.set_bytes(edwards25519.dsc_basepoint) or { panic(err.msg) }
|
||||||
|
return p
|
||||||
|
}
|
||||||
|
|
||||||
|
fn test_scalar_mult_small_scalars() {
|
||||||
|
mut z := Scalar{}
|
||||||
|
mut p := Point{}
|
||||||
|
mut b := new_generator_point()
|
||||||
|
mut i := new_identity_point()
|
||||||
|
p.scalar_mult(mut z, b)
|
||||||
|
|
||||||
|
assert i.equal(p) == 1
|
||||||
|
assert check_on_curve(p) == true
|
||||||
|
|
||||||
|
z = Scalar{[byte(1), 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
|
||||||
|
0, 0, 0, 0, 0, 0, 0]!}
|
||||||
|
p.scalar_mult(mut z, b)
|
||||||
|
|
||||||
|
assert b.equal(p) == 1
|
||||||
|
assert check_on_curve(p) == true
|
||||||
|
}
|
||||||
|
|
||||||
|
fn test_scalar_mult_vs_dalek() {
|
||||||
|
mut p := Point{}
|
||||||
|
mut b := new_generator_point()
|
||||||
|
mut dsc := edwards25519.dalek_scalar
|
||||||
|
p.scalar_mult(mut dsc, b)
|
||||||
|
mut ds := dalek_scalar_basepoint()
|
||||||
|
assert ds.equal(p) == 1
|
||||||
|
|
||||||
|
assert check_on_curve(p) == true
|
||||||
|
}
|
||||||
|
|
||||||
|
fn test_scalar_base_mult_vs_dalek() {
|
||||||
|
mut p := Point{}
|
||||||
|
mut dsc := edwards25519.dalek_scalar
|
||||||
|
p.scalar_base_mult(mut dsc)
|
||||||
|
mut ds := dalek_scalar_basepoint()
|
||||||
|
assert ds.equal(p) == 1
|
||||||
|
|
||||||
|
assert check_on_curve(p)
|
||||||
|
}
|
||||||
|
|
||||||
|
fn test_vartime_double_basemult_vs_dalek() {
|
||||||
|
mut p := Point{}
|
||||||
|
mut z := Scalar{}
|
||||||
|
b := new_generator_point()
|
||||||
|
p.vartime_double_scalar_base_mult(edwards25519.dalek_scalar, b, z)
|
||||||
|
|
||||||
|
mut ds := dalek_scalar_basepoint()
|
||||||
|
assert ds.equal(p) == 1
|
||||||
|
assert check_on_curve(p)
|
||||||
|
|
||||||
|
p.vartime_double_scalar_base_mult(z, b, edwards25519.dalek_scalar)
|
||||||
|
|
||||||
|
assert ds.equal(p) == 1
|
||||||
|
assert check_on_curve(p)
|
||||||
|
}
|
||||||
|
|
||||||
|
fn test_scalar_mult_distributes_over_add() {
|
||||||
|
mut x := generate_scalar(100) or { panic(err.msg) }
|
||||||
|
mut y := generate_scalar(100) or { panic(err.msg) }
|
||||||
|
mut z := Scalar{}
|
||||||
|
|
||||||
|
z.add(x, y)
|
||||||
|
|
||||||
|
mut p := Point{}
|
||||||
|
mut q := Point{}
|
||||||
|
mut r := Point{}
|
||||||
|
mut check := Point{}
|
||||||
|
mut b := new_generator_point()
|
||||||
|
|
||||||
|
p.scalar_mult(mut x, b)
|
||||||
|
q.scalar_mult(mut y, b)
|
||||||
|
r.scalar_mult(mut z, b)
|
||||||
|
check.add(p, q)
|
||||||
|
|
||||||
|
assert check_on_curve(p, q, r, check) == true
|
||||||
|
assert check.equal(r) == 1
|
||||||
|
}
|
||||||
|
|
||||||
|
fn test_scalarmult_non_identity_point() ? {
|
||||||
|
// Check whether p.ScalarMult and q.ScalaBaseMult give the same,
|
||||||
|
// when p and q are originally set to the base point.
|
||||||
|
|
||||||
|
mut x := generate_scalar(5000) ?
|
||||||
|
|
||||||
|
mut p := Point{}
|
||||||
|
mut q := Point{}
|
||||||
|
mut b := new_generator_point()
|
||||||
|
p.set(b)
|
||||||
|
q.set(b)
|
||||||
|
|
||||||
|
p.scalar_mult(mut x, b)
|
||||||
|
q.scalar_base_mult(mut x)
|
||||||
|
|
||||||
|
assert check_on_curve(p, q) == true
|
||||||
|
|
||||||
|
assert p.equal(q) == 1
|
||||||
|
}
|
||||||
|
|
||||||
|
fn test_basepoint_table_generation() {
|
||||||
|
// The basepoint table is 32 affineLookupTables,
|
||||||
|
// corresponding to (16^2i)*B for table i.
|
||||||
|
bptable := basepoint_table()
|
||||||
|
b := new_generator_point()
|
||||||
|
mut tmp1 := ProjectiveP1{}
|
||||||
|
mut tmp2 := ProjectiveP2{}
|
||||||
|
mut tmp3 := Point{}
|
||||||
|
tmp3.set(b)
|
||||||
|
mut table := []AffineLookupTable{len: 32}
|
||||||
|
for i := 0; i < 32; i++ {
|
||||||
|
// Build the table
|
||||||
|
table[i].from_p3(tmp3)
|
||||||
|
|
||||||
|
// Assert equality with the hardcoded one
|
||||||
|
assert table[i] == bptable[i]
|
||||||
|
|
||||||
|
// Set p = (16^2)*p = 256*p = 2^8*p
|
||||||
|
tmp2.from_p3(tmp3)
|
||||||
|
for j := 0; j < 7; j++ {
|
||||||
|
tmp1.double(tmp2)
|
||||||
|
tmp2.from_p1(tmp1)
|
||||||
|
}
|
||||||
|
tmp1.double(tmp2)
|
||||||
|
tmp3.from_p1(tmp1)
|
||||||
|
|
||||||
|
assert check_on_curve(tmp3) == true
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
fn test_scalar_mult_matches_base_mult() {
|
||||||
|
mut x := generate_scalar(100) or { panic(err.msg) }
|
||||||
|
b := new_generator_point()
|
||||||
|
mut p := Point{}
|
||||||
|
mut q := Point{}
|
||||||
|
|
||||||
|
p.scalar_mult(mut x, b)
|
||||||
|
q.scalar_base_mult(mut x)
|
||||||
|
|
||||||
|
assert check_on_curve(p, q) == true
|
||||||
|
assert p.equal(q) == 1
|
||||||
|
}
|
||||||
|
|
||||||
|
fn test_basepoint_naf_table_generation() {
|
||||||
|
mut table := NafLookupTable8{}
|
||||||
|
b := new_generator_point()
|
||||||
|
|
||||||
|
table.from_p3(b)
|
||||||
|
|
||||||
|
bnt := basepoint_naf_table()
|
||||||
|
assert table == bnt
|
||||||
|
}
|
||||||
|
|
||||||
|
fn test_vartime_double_scalar_base_mult() {
|
||||||
|
mut x := generate_scalar(100) or { panic(err.msg) }
|
||||||
|
mut y := generate_scalar(100) or { panic(err.msg) }
|
||||||
|
b := new_generator_point()
|
||||||
|
|
||||||
|
mut p := Point{}
|
||||||
|
mut q1 := Point{}
|
||||||
|
mut q2 := Point{}
|
||||||
|
mut check := Point{}
|
||||||
|
|
||||||
|
p.vartime_double_scalar_base_mult(x, b, y)
|
||||||
|
|
||||||
|
q1.scalar_base_mult(mut x)
|
||||||
|
q2.scalar_base_mult(mut y)
|
||||||
|
check.add(q1, q2)
|
||||||
|
|
||||||
|
assert check_on_curve(p, check, q1, q2) == true
|
||||||
|
assert p.equal(check) == 1
|
||||||
|
}
|
127
vlib/crypto/ed25519/internal/edwards25519/table.v
Normal file
127
vlib/crypto/ed25519/internal/edwards25519/table.v
Normal file
@ -0,0 +1,127 @@
|
|||||||
|
module edwards25519
|
||||||
|
|
||||||
|
import crypto.internal.subtle
|
||||||
|
|
||||||
|
// A precomputed lookup table for fixed-base, constant-time scalar muls.
|
||||||
|
struct AffineLookupTable {
|
||||||
|
mut:
|
||||||
|
points [8]AffineCached
|
||||||
|
}
|
||||||
|
|
||||||
|
// A dynamic lookup table for variable-base, constant-time scalar muls.
|
||||||
|
struct ProjLookupTable {
|
||||||
|
mut:
|
||||||
|
points [8]ProjectiveCached
|
||||||
|
}
|
||||||
|
|
||||||
|
// A dynamic lookup table for variable-base, variable-time scalar muls.
|
||||||
|
struct NafLookupTable5 {
|
||||||
|
mut:
|
||||||
|
points [8]ProjectiveCached
|
||||||
|
}
|
||||||
|
|
||||||
|
// A precomputed lookup table for fixed-base, variable-time scalar muls.
|
||||||
|
struct NafLookupTable8 {
|
||||||
|
mut:
|
||||||
|
points [64]AffineCached
|
||||||
|
}
|
||||||
|
|
||||||
|
// Constructors.
|
||||||
|
|
||||||
|
// Builds a lookup table at runtime. Fast.
|
||||||
|
fn (mut v ProjLookupTable) from_p3(q Point) {
|
||||||
|
// Goal: v.points[i] = (i+1)*Q, i.e., Q, 2Q, ..., 8Q
|
||||||
|
// This allows lookup of -8Q, ..., -Q, 0, Q, ..., 8Q
|
||||||
|
v.points[0].from_p3(q)
|
||||||
|
mut tmp_p3 := Point{}
|
||||||
|
mut tmp_p1 := ProjectiveP1{}
|
||||||
|
for i := 0; i < 7; i++ {
|
||||||
|
// Compute (i+1)*Q as Q + i*Q and convert to a ProjCached
|
||||||
|
// This is needlessly complicated because the API has explicit
|
||||||
|
// recievers instead of creating stack objects and relying on RVO
|
||||||
|
v.points[i + 1].from_p3(tmp_p3.from_p1(tmp_p1.add(q, v.points[i])))
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
// This is not optimised for speed; fixed-base tables should be precomputed.
|
||||||
|
fn (mut v AffineLookupTable) from_p3(q Point) {
|
||||||
|
// Goal: v.points[i] = (i+1)*Q, i.e., Q, 2Q, ..., 8Q
|
||||||
|
// This allows lookup of -8Q, ..., -Q, 0, Q, ..., 8Q
|
||||||
|
v.points[0].from_p3(q)
|
||||||
|
mut tmp_p3 := Point{}
|
||||||
|
mut tmp_p1 := ProjectiveP1{}
|
||||||
|
for i := 0; i < 7; i++ {
|
||||||
|
// Compute (i+1)*Q as Q + i*Q and convert to AffineCached
|
||||||
|
v.points[i + 1].from_p3(tmp_p3.from_p1(tmp_p1.add_affine(q, v.points[i])))
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
// Builds a lookup table at runtime. Fast.
|
||||||
|
fn (mut v NafLookupTable5) from_p3(q Point) {
|
||||||
|
// Goal: v.points[i] = (2*i+1)*Q, i.e., Q, 3Q, 5Q, ..., 15Q
|
||||||
|
// This allows lookup of -15Q, ..., -3Q, -Q, 0, Q, 3Q, ..., 15Q
|
||||||
|
v.points[0].from_p3(q)
|
||||||
|
mut q2 := Point{}
|
||||||
|
q2.add(q, q)
|
||||||
|
mut tmp_p3 := Point{}
|
||||||
|
mut tmp_p1 := ProjectiveP1{}
|
||||||
|
for i := 0; i < 7; i++ {
|
||||||
|
v.points[i + 1].from_p3(tmp_p3.from_p1(tmp_p1.add(q2, v.points[i])))
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
// This is not optimised for speed; fixed-base tables should be precomputed.
|
||||||
|
fn (mut v NafLookupTable8) from_p3(q Point) {
|
||||||
|
v.points[0].from_p3(q)
|
||||||
|
mut q2 := Point{}
|
||||||
|
q2.add(q, q)
|
||||||
|
mut tmp_p3 := Point{}
|
||||||
|
mut tmp_p1 := ProjectiveP1{}
|
||||||
|
for i := 0; i < 63; i++ {
|
||||||
|
v.points[i + 1].from_p3(tmp_p3.from_p1(tmp_p1.add_affine(q2, v.points[i])))
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
// Selectors.
|
||||||
|
|
||||||
|
// Set dest to x*Q, where -8 <= x <= 8, in constant time.
|
||||||
|
fn (mut v ProjLookupTable) select_into(mut dest ProjectiveCached, x i8) {
|
||||||
|
// Compute xabs = |x|
|
||||||
|
xmask := x >> 7
|
||||||
|
xabs := byte((x + xmask) ^ xmask)
|
||||||
|
|
||||||
|
dest.zero()
|
||||||
|
for j := 1; j <= 8; j++ {
|
||||||
|
// Set dest = j*Q if |x| = j
|
||||||
|
cond := subtle.constant_time_byte_eq(xabs, byte(j))
|
||||||
|
dest.selected(&v.points[j - 1], dest, cond)
|
||||||
|
}
|
||||||
|
// Now dest = |x|*Q, conditionally negate to get x*Q
|
||||||
|
dest.cond_neg(int(xmask & 1))
|
||||||
|
}
|
||||||
|
|
||||||
|
// Set dest to x*Q, where -8 <= x <= 8, in constant time.
|
||||||
|
fn (mut v AffineLookupTable) select_into(mut dest AffineCached, x i8) {
|
||||||
|
// Compute xabs = |x|
|
||||||
|
xmask := x >> 7
|
||||||
|
xabs := byte((x + xmask) ^ xmask)
|
||||||
|
|
||||||
|
dest.zero()
|
||||||
|
for j := 1; j <= 8; j++ {
|
||||||
|
// Set dest = j*Q if |x| = j
|
||||||
|
cond := subtle.constant_time_byte_eq(xabs, byte(j))
|
||||||
|
dest.selected(v.points[j - 1], dest, cond)
|
||||||
|
}
|
||||||
|
// Now dest = |x|*Q, conditionally negate to get x*Q
|
||||||
|
dest.cond_neg(int(xmask & 1))
|
||||||
|
}
|
||||||
|
|
||||||
|
// Given odd x with 0 < x < 2^4, return x*Q (in variable time).
|
||||||
|
fn (mut v NafLookupTable5) select_into(mut dest ProjectiveCached, x i8) {
|
||||||
|
dest = v.points[x / 2]
|
||||||
|
}
|
||||||
|
|
||||||
|
// Given odd x with 0 < x < 2^7, return x*Q (in variable time).
|
||||||
|
fn (mut v NafLookupTable8) select_into(mut dest AffineCached, x i8) {
|
||||||
|
dest = v.points[x / 2]
|
||||||
|
}
|
121
vlib/crypto/ed25519/internal/edwards25519/table_test.v
Normal file
121
vlib/crypto/ed25519/internal/edwards25519/table_test.v
Normal file
@ -0,0 +1,121 @@
|
|||||||
|
module edwards25519
|
||||||
|
|
||||||
|
fn test_proj_lookup_table() {
|
||||||
|
mut table := ProjLookupTable{}
|
||||||
|
b := new_generator_point()
|
||||||
|
table.from_p3(b)
|
||||||
|
|
||||||
|
mut tmp1 := ProjectiveCached{}
|
||||||
|
mut tmp2 := ProjectiveCached{}
|
||||||
|
mut tmp3 := ProjectiveCached{}
|
||||||
|
|
||||||
|
table.select_into(mut tmp1, 6)
|
||||||
|
table.select_into(mut tmp2, -2)
|
||||||
|
table.select_into(mut tmp3, -4)
|
||||||
|
|
||||||
|
// Expect T1 + T2 + T3 = identity
|
||||||
|
mut acc_p1 := ProjectiveP1{}
|
||||||
|
mut acc_p3 := new_identity_point()
|
||||||
|
|
||||||
|
acc_p1.add(acc_p3, tmp1)
|
||||||
|
acc_p3.from_p1(acc_p1)
|
||||||
|
acc_p1.add(acc_p3, tmp2)
|
||||||
|
acc_p3.from_p1(acc_p1)
|
||||||
|
acc_p1.add(acc_p3, tmp3)
|
||||||
|
acc_p3.from_p1(acc_p1)
|
||||||
|
|
||||||
|
assert acc_p3.equal(id_point) == 1
|
||||||
|
}
|
||||||
|
|
||||||
|
fn test_affine_lookup_table() {
|
||||||
|
mut table := AffineLookupTable{}
|
||||||
|
b := new_generator_point()
|
||||||
|
table.from_p3(b)
|
||||||
|
|
||||||
|
mut tmp1 := AffineCached{}
|
||||||
|
mut tmp2 := AffineCached{}
|
||||||
|
mut tmp3 := AffineCached{}
|
||||||
|
|
||||||
|
table.select_into(mut tmp1, 3)
|
||||||
|
table.select_into(mut tmp2, -7)
|
||||||
|
table.select_into(mut tmp3, 4)
|
||||||
|
// Expect T1 + T2 + T3 = identity
|
||||||
|
|
||||||
|
mut acc_p1 := ProjectiveP1{}
|
||||||
|
mut acc_p3 := new_identity_point()
|
||||||
|
|
||||||
|
acc_p1.add_affine(acc_p3, tmp1)
|
||||||
|
acc_p3.from_p1(acc_p1)
|
||||||
|
acc_p1.add_affine(acc_p3, tmp2)
|
||||||
|
acc_p3.from_p1(acc_p1)
|
||||||
|
acc_p1.add_affine(acc_p3, tmp3)
|
||||||
|
acc_p3.from_p1(acc_p1)
|
||||||
|
|
||||||
|
assert acc_p3.equal(id_point) == 1
|
||||||
|
}
|
||||||
|
|
||||||
|
fn test_naf_lookup_table5() {
|
||||||
|
mut table := NafLookupTable5{}
|
||||||
|
b := new_generator_point()
|
||||||
|
table.from_p3(b)
|
||||||
|
|
||||||
|
mut tmp1 := ProjectiveCached{}
|
||||||
|
mut tmp2 := ProjectiveCached{}
|
||||||
|
mut tmp3 := ProjectiveCached{}
|
||||||
|
mut tmp4 := ProjectiveCached{}
|
||||||
|
|
||||||
|
table.select_into(mut tmp1, 9)
|
||||||
|
table.select_into(mut tmp2, 11)
|
||||||
|
table.select_into(mut tmp3, 7)
|
||||||
|
table.select_into(mut tmp4, 13)
|
||||||
|
// Expect T1 + T2 = T3 + T4
|
||||||
|
|
||||||
|
mut acc_p1 := ProjectiveP1{}
|
||||||
|
mut lhs := new_identity_point()
|
||||||
|
mut rhs := new_identity_point()
|
||||||
|
|
||||||
|
acc_p1.add(lhs, tmp1)
|
||||||
|
lhs.from_p1(acc_p1)
|
||||||
|
acc_p1.add(lhs, tmp2)
|
||||||
|
lhs.from_p1(acc_p1)
|
||||||
|
|
||||||
|
acc_p1.add(rhs, tmp3)
|
||||||
|
rhs.from_p1(acc_p1)
|
||||||
|
acc_p1.add(rhs, tmp4)
|
||||||
|
rhs.from_p1(acc_p1)
|
||||||
|
|
||||||
|
assert lhs.equal(rhs) == 1
|
||||||
|
}
|
||||||
|
|
||||||
|
fn test_naf_lookup_table8() {
|
||||||
|
mut table := NafLookupTable8{}
|
||||||
|
b := new_generator_point()
|
||||||
|
table.from_p3(b)
|
||||||
|
|
||||||
|
mut tmp1 := AffineCached{}
|
||||||
|
mut tmp2 := AffineCached{}
|
||||||
|
mut tmp3 := AffineCached{}
|
||||||
|
mut tmp4 := AffineCached{}
|
||||||
|
|
||||||
|
table.select_into(mut tmp1, 49)
|
||||||
|
table.select_into(mut tmp2, 11)
|
||||||
|
table.select_into(mut tmp3, 35)
|
||||||
|
table.select_into(mut tmp4, 25)
|
||||||
|
// Expect T1 + T2 = T3 + T4
|
||||||
|
|
||||||
|
mut acc_p1 := ProjectiveP1{}
|
||||||
|
mut lhs := new_identity_point()
|
||||||
|
mut rhs := new_identity_point()
|
||||||
|
|
||||||
|
acc_p1.add_affine(lhs, tmp1)
|
||||||
|
lhs.from_p1(acc_p1)
|
||||||
|
acc_p1.add_affine(lhs, tmp2)
|
||||||
|
lhs.from_p1(acc_p1)
|
||||||
|
|
||||||
|
acc_p1.add_affine(rhs, tmp3)
|
||||||
|
rhs.from_p1(acc_p1)
|
||||||
|
acc_p1.add_affine(rhs, tmp4)
|
||||||
|
rhs.from_p1(acc_p1)
|
||||||
|
|
||||||
|
assert lhs.equal(rhs) == 1
|
||||||
|
}
|
128
vlib/crypto/ed25519/testdata/sign.input
vendored
Normal file
128
vlib/crypto/ed25519/testdata/sign.input
vendored
Normal file
@ -0,0 +1,128 @@
|
|||||||
|
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|
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575f8fb6c7465e92c250caeec1786224bc3eed729e463953a394c9849cba908f71bfa98f5bea790ff183d924e6655cea08d0aafb617f46d23a17a657f0a9b8b2:71bfa98f5bea790ff183d924e6655cea08d0aafb617f46d23a17a657f0a9b8b2:2cc372e25e53a138793064610e7ef25d9d7422e18e249675a72e79167f43baf452cbacb50182faf80798cc38597a44b307a536360b0bc1030f8397b94cbf147353dd2d671cb8cab219a2d7b9eb828e9635d2eab6eb08182cb03557783fd282aaf7b471747c84acf72debe4514524f8447bafccccec0a840feca9755ff9adb60301c2f25d4e3ba621df5ad72100c45d7a4b91559c725ab56bb29830e35f5a6faf87db23001f11ffba9c0c15440302065827a7d7aaaeab7b446abce333c0d30c3eae9c9da63eb1c0391d4269b12c45b660290611ac29c91dbd80dc6ed302a4d191f2923922f032ab1ac10ca7323b5241c5751c3c004ac39eb1267aa10017ed2dac6c934a250dda8cb06d5be9f563b827bf3c8d95fd7d2a7e7cc3acbee92538bd7ddfba3ab2dc9f791fac76cdf9cd6a6923534cf3e067108f6aa03e320d954085c218038a70cc768b972e49952b9fe171ee1be2a52cd469b8d36b84ee902cd9410db2777192e90070d2e7c56cb6a45f0a839c78c219203b6f1b33cb4504c6a7996427741e6874cf45c5fa5a38765a1ebf1796ce16e63ee509612c40f088cbceffa3affbc13b75a1b9c02c61a180a7e83b17884fe0ec0f2fe57c47e73a22f753eaf50fca655ebb19896b827a3474911c67853c58b4a78fd085a23239b9737ef8a7baff11ddce5f2cae0543f8b45d144ae6918b9a75293ec78ea618cd2cd08c971301cdfa0a9275c1bf441d4c1f878a2e733ce0a33b6ecdacbbf0bdb5c3643fa45a013979cd01396962897421129a88757c0d88b5ac7e44fdbd938ba4bc37de4929d53751fbb43d4e09a80e735244acada8e6749f77787f33763c7472df52934591591fb226c503c8be61a920a7d37eb1686b62216957844c43c484e58745775553: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:
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Reference in New Issue
Block a user