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