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v/vlib/crypto/sha512/sha512.v
2019-08-07 13:37:07 +02:00

302 lines
7.0 KiB
Go

// Copyright (c) 2019 Alexander Medvednikov. All rights reserved.
// Use of this source code is governed by an MIT license
// that can be found in the LICENSE file.
// Package sha512 implements the SHA-384, SHA-512, SHA-512/224, and SHA-512/256
// hash algorithms as defined in FIPS 180-4.
// Based off: https://github.com/golang/go/tree/master/src/crypto/sha512
// Last commit: https://github.com/golang/go/commit/3ce865d7a0b88714cc433454ae2370a105210c01
module sha512
import (
crypto
encoding.binary
)
const (
// Size is the size, in bytes, of a SHA-512 checksum.
Size = 64
// Size224 is the size, in bytes, of a SHA-512/224 checksum.
Size224 = 28
// Size256 is the size, in bytes, of a SHA-512/256 checksum.
Size256 = 32
// Size384 is the size, in bytes, of a SHA-384 checksum.
Size384 = 48
// BlockSize is the block size, in bytes, of the SHA-512/224,
// SHA-512/256, SHA-384 and SHA-512 hash functions.
BlockSize = 128
)
const (
Chunk = 128
Init0 = 0x6a09e667f3bcc908
Init1 = 0xbb67ae8584caa73b
Init2 = 0x3c6ef372fe94f82b
Init3 = 0xa54ff53a5f1d36f1
Init4 = 0x510e527fade682d1
Init5 = 0x9b05688c2b3e6c1f
Init6 = 0x1f83d9abfb41bd6b
Init7 = 0x5be0cd19137e2179
Init0_224 = 0x8c3d37c819544da2
Init1_224 = 0x73e1996689dcd4d6
Init2_224 = 0x1dfab7ae32ff9c82
Init3_224 = 0x679dd514582f9fcf
Init4_224 = 0x0f6d2b697bd44da8
Init5_224 = 0x77e36f7304c48942
Init6_224 = 0x3f9d85a86a1d36c8
Init7_224 = 0x1112e6ad91d692a1
Init0_256 = 0x22312194fc2bf72c
Init1_256 = 0x9f555fa3c84c64c2
Init2_256 = 0x2393b86b6f53b151
Init3_256 = 0x963877195940eabd
Init4_256 = 0x96283ee2a88effe3
Init5_256 = 0xbe5e1e2553863992
Init6_256 = 0x2b0199fc2c85b8aa
Init7_256 = 0x0eb72ddc81c52ca2
Init0_384 = 0xcbbb9d5dc1059ed8
Init1_384 = 0x629a292a367cd507
Init2_384 = 0x9159015a3070dd17
Init3_384 = 0x152fecd8f70e5939
Init4_384 = 0x67332667ffc00b31
Init5_384 = 0x8eb44a8768581511
Init6_384 = 0xdb0c2e0d64f98fa7
Init7_384 = 0x47b5481dbefa4fa4
)
// digest represents the partial evaluation of a checksum.
struct Digest {
mut:
h []u64
x []byte
nx int
len u64
function crypto.Hash
}
fn (d mut Digest) reset() {
d.h = [u64(0); 8]
d.x = [byte(0); Chunk]
switch d.function {
case crypto.Hash.SHA384:
d.h[0] = Init0_384
d.h[1] = Init1_384
d.h[2] = Init2_384
d.h[3] = Init3_384
d.h[4] = Init4_384
d.h[5] = Init5_384
d.h[6] = Init6_384
d.h[7] = Init7_384
case crypto.Hash.SHA512_224:
d.h[0] = Init0_224
d.h[1] = Init1_224
d.h[2] = Init2_224
d.h[3] = Init3_224
d.h[4] = Init4_224
d.h[5] = Init5_224
d.h[6] = Init6_224
d.h[7] = Init7_224
case crypto.Hash.SHA512_256:
d.h[0] = Init0_256
d.h[1] = Init1_256
d.h[2] = Init2_256
d.h[3] = Init3_256
d.h[4] = Init4_256
d.h[5] = Init5_256
d.h[6] = Init6_256
d.h[7] = Init7_256
default:
d.h[0] = Init0
d.h[1] = Init1
d.h[2] = Init2
d.h[3] = Init3
d.h[4] = Init4
d.h[5] = Init5
d.h[6] = Init6
d.h[7] = Init7
}
d.nx = 0
d.len = u64(0)
}
fn _new(hash crypto.Hash) *Digest {
mut d := &Digest{function: hash}
d.reset()
return d
}
// new returns a new Digest (implementing hash.Hash) computing the SHA-512 checksum.
pub fn new() *Digest {
return _new(crypto.Hash.SHA512)
}
// new512_224 returns a new Digest (implementing hash.Hash) computing the SHA-512/224 checksum.
fn new512_224() *Digest {
return _new(crypto.Hash.SHA512_224)
}
// new512_256 returns a new Digest (implementing hash.Hash) computing the SHA-512/256 checksum.
fn new512_256() *Digest {
return _new(crypto.Hash.SHA512_256)
}
// new384 returns a new Digest (implementing hash.Hash) computing the SHA-384 checksum.
fn new384() *Digest {
return _new(crypto.Hash.SHA384)
}
fn (d mut Digest) write(p_ []byte) ?int {
mut p := p_
nn := p.len
d.len += u64(nn)
if d.nx > 0 {
n := copy(d.x.right(d.nx), p)
d.nx += n
if d.nx == Chunk {
block(mut d, d.x)
d.nx = 0
}
if n >= p.len {
p = []byte
} else {
p = p.right(n)
}
}
if p.len >= Chunk {
n := p.len &~ (Chunk - 1)
block(mut d, p.left(n))
if n >= p.len {
p = []byte
} else {
p = p.right(n)
}
}
if p.len > 0 {
d.nx = copy(d.x, p)
}
return nn
}
fn (d mut Digest) sum(b_in mut []byte) []byte {
// Make a copy of d so that caller can keep writing and summing.
mut d0 := *d
hash := d0.checksum()
switch d0.function {
case crypto.Hash.SHA384:
for b in hash.left(Size384) {
b_in << b
}
case crypto.Hash.SHA512_224:
for b in hash.left(Size224) {
b_in << b
}
case crypto.Hash.SHA512_256:
for b in hash.left(Size256) {
b_in << b
}
default:
for b in hash {
b_in << b
}
}
return *b_in
}
fn (d mut Digest) checksum() []byte {
// Padding. Add a 1 bit and 0 bits until 112 bytes mod 128.
mut len := d.len
mut tmp := [byte(0); 128]
tmp[0] = 0x80
if int(len)%128 < 112 {
d.write(tmp.left(112-int(len)%128))
} else {
d.write(tmp.left(128+112-int(len)%128))
}
// Length in bits.
len <<= u64(3)
binary.big_endian_put_u64(mut tmp, u64(0)) // upper 64 bits are always zero, because len variable has type u64
binary.big_endian_put_u64(mut tmp.right(8), len)
d.write(tmp.left(16))
if d.nx != 0 {
panic('d.nx != 0')
}
mut digest := [byte(0); Size]
binary.big_endian_put_u64(mut digest, d.h[0])
binary.big_endian_put_u64(mut digest.right(8), d.h[1])
binary.big_endian_put_u64(mut digest.right(16), d.h[2])
binary.big_endian_put_u64(mut digest.right(24), d.h[3])
binary.big_endian_put_u64(mut digest.right(32), d.h[4])
binary.big_endian_put_u64(mut digest.right(40), d.h[5])
if d.function != crypto.Hash.SHA384 {
binary.big_endian_put_u64(mut digest.right(48), d.h[6])
binary.big_endian_put_u64(mut digest.right(56), d.h[7])
}
return digest
}
// sum512 returns the SHA512 checksum of the data.
pub fn sum512(data []byte) []byte {
mut d := _new(crypto.Hash.SHA512)
d.write(data)
return d.checksum()
}
// sum384 returns the SHA384 checksum of the data.
pub fn sum384(data []byte) []byte {
mut d := _new(crypto.Hash.SHA384)
d.write(data)
sum := d.checksum()
mut sum384 := [byte(0); Size384]
copy(sum384, sum.left(Size384))
return sum384
}
// sum512_224 returns the Sum512/224 checksum of the data.
pub fn sum512_224(data []byte) []byte {
mut d := _new(crypto.Hash.SHA512_224)
d.write(data)
sum := d.checksum()
mut sum224 := [byte(0); Size224]
copy(sum224, sum.left(Size224))
return sum224
}
// Sum512_256 returns the Sum512/256 checksum of the data.
pub fn sum512_256(data []byte) []byte {
mut d := _new(crypto.Hash.SHA512_256)
d.write(data)
sum := d.checksum()
mut sum256 := [byte(0); Size256]
copy(sum256, sum.left(Size256))
return sum256
}
fn block(dig mut Digest, p []byte) {
// For now just use block_generic until we have specific
// architecture optimized versions
block_generic(mut dig, p)
}
pub fn (d &Digest) size() int {
switch d.function {
case crypto.Hash.SHA512_224:
return Size224
case crypto.Hash.SHA512_256:
return Size256
case crypto.Hash.SHA384:
return Size384
default:
return Size
}
}
pub fn (d &Digest) block_size() int { return BlockSize }