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v/vlib/crypto/sha512/sha512.v
Alexander Medvednikov 5946f67328 final switch => match
2019-10-27 12:38:50 +03:00

313 lines
7.2 KiB
V

// 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
// block_size is the block size, in bytes, of the SHA-512/224,
// SHA-512/256, SHA-384 and SHA-512 hash functions.
block_size = 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)].repeat(8)
d.x = [byte(0)].repeat(Chunk)
match d.function {
.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
}
.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
}
.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
}
else {
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 = 0
}
// internal
fn new_digest(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_digest(crypto.Hash.sha512)
}
// new512_224 returns a new Digest (implementing hash.Hash) computing the SHA-512/224 checksum.
fn new512_224() &Digest {
return new_digest(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_digest(crypto.Hash.sha512_256)
}
// new384 returns a new Digest (implementing hash.Hash) computing the SHA-384 checksum.
fn new384() &Digest {
return new_digest(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[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[n..]
}
}
if p.len >= Chunk {
n := p.len &~ (Chunk - 1)
block(mut d, p[..n])
if n >= p.len {
p = []byte
} else {
p = p[n..]
}
}
if p.len > 0 {
d.nx = copy(d.x, p)
}
return nn
}
fn (d mut Digest) sum(b_in []byte) []byte {
// Make a copy of d so that caller can keep writing and summing.
mut d0 := *d
hash := d0.checksum()
mut b_out := b_in.clone()
match d0.function {
.sha384 {
for b in hash[..size384] {
b_out << b
}
}
.sha512_224 {
for b in hash[..size224] {
b_out << b
}
}
.sha512_256 {
for b in hash[..size256] {
b_out << b
}
}
else {
for b in hash {
b_out << b
}
}
}
return b_out
}
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)].repeat(128)
tmp[0] = 0x80
if int(len)%128 < 112 {
d.write(tmp[..112-int(len)%128])
} else {
d.write(tmp[..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[8..], len)
d.write(tmp[..16])
if d.nx != 0 {
panic('d.nx != 0')
}
mut digest := [byte(0)].repeat(size)
binary.big_endian_put_u64(mut digest, d.h[0])
binary.big_endian_put_u64(mut digest[8..], d.h[1])
binary.big_endian_put_u64(mut digest[16..], d.h[2])
binary.big_endian_put_u64(mut digest[24..], d.h[3])
binary.big_endian_put_u64(mut digest[32..], d.h[4])
binary.big_endian_put_u64(mut digest[40..], d.h[5])
if d.function != crypto.Hash.sha384 {
binary.big_endian_put_u64(mut digest[48..], d.h[6])
binary.big_endian_put_u64(mut digest[56..], d.h[7])
}
return digest
}
// sum512 returns the SHA512 checksum of the data.
pub fn sum512(data []byte) []byte {
mut d := new_digest(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_digest(crypto.Hash.sha384)
d.write(data)
sum := d.checksum()
mut sum384 := [byte(0)].repeat(size384)
copy(sum384, sum[..size384])
return sum384
}
// sum512_224 returns the Sum512/224 checksum of the data.
pub fn sum512_224(data []byte) []byte {
mut d := new_digest(crypto.Hash.sha512_224)
d.write(data)
sum := d.checksum()
mut sum224 := [byte(0)].repeat(size224)
copy(sum224, sum[..size224])
return sum224
}
// Sum512_256 returns the Sum512/256 checksum of the data.
pub fn sum512_256(data []byte) []byte {
mut d := new_digest(crypto.Hash.sha512_256)
d.write(data)
sum := d.checksum()
mut sum256 := [byte(0)].repeat(size256)
copy(sum256, sum[..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 {
match d.function {
.sha512_224 { return size224 }
.sha512_256 { return size256 }
.sha384 { return size384 }
else { return size }
}
}
pub fn (d &Digest) block_size() int { return block_size }
pub fn hexhash(s string) string { return sum512(s.bytes()).hex() }
pub fn hexhash_384(s string) string { return sum384(s.bytes()).hex() }
pub fn hexhash_512_224(s string) string { return sum512_224(s.bytes()).hex() }
pub fn hexhash_512_256(s string) string { return sum512_256(s.bytes()).hex() }