2022-01-04 12:21:08 +03:00
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// Copyright (c) 2019-2022 Alexander Medvednikov. All rights reserved.
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2019-11-14 10:00:22 +03:00
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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 sha256 implements the SHA224 and SHA256 hash algorithms as defined
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// in FIPS 180-4.
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// Based off: https://github.com/golang/go/tree/master/src/crypto/sha256
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// Last commit: https://github.com/golang/go/commit/3ce865d7a0b88714cc433454ae2370a105210c01
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module sha256
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import encoding.binary
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2019-12-06 15:24:53 +03:00
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pub const (
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// The size of a SHA256 checksum in bytes.
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size = 32
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// The size of a SHA224 checksum in bytes.
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size224 = 28
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// The blocksize of SHA256 and SHA224 in bytes.
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block_size = 64
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)
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const (
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chunk = 64
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init0 = 0x6A09E667
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init1 = u32(0xBB67AE85)
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init2 = 0x3C6EF372
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init3 = u32(0xA54FF53A)
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init4 = 0x510E527F
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init5 = u32(0x9B05688C)
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init6 = 0x1F83D9AB
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init7 = 0x5BE0CD19
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init0_224 = u32(0xC1059ED8)
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init1_224 = 0x367CD507
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init2_224 = 0x3070DD17
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init3_224 = u32(0xF70E5939)
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init4_224 = u32(0xFFC00B31)
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init5_224 = 0x68581511
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init6_224 = 0x64F98FA7
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init7_224 = u32(0xBEFA4FA4)
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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 []u32
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x []u8
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nx int
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len u64
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is224 bool // mark if this digest is SHA-224
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}
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2020-05-17 14:51:18 +03:00
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fn (mut d Digest) reset() {
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d.h = []u32{len: (8)}
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d.x = []u8{len: sha256.chunk}
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if !d.is224 {
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d.h[0] = u32(sha256.init0)
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d.h[1] = u32(sha256.init1)
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d.h[2] = u32(sha256.init2)
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d.h[3] = u32(sha256.init3)
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d.h[4] = u32(sha256.init4)
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d.h[5] = u32(sha256.init5)
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d.h[6] = u32(sha256.init6)
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d.h[7] = u32(sha256.init7)
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} else {
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d.h[0] = u32(sha256.init0_224)
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d.h[1] = u32(sha256.init1_224)
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d.h[2] = u32(sha256.init2_224)
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d.h[3] = u32(sha256.init3_224)
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d.h[4] = u32(sha256.init4_224)
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d.h[5] = u32(sha256.init5_224)
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d.h[6] = u32(sha256.init6_224)
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d.h[7] = u32(sha256.init7_224)
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}
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d.nx = 0
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d.len = 0
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}
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// new returns a new Digest (implementing hash.Hash) computing the SHA256 checksum.
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pub fn new() &Digest {
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mut d := &Digest{}
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d.reset()
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return d
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}
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// new224 returns a new Digest (implementing hash.Hash) computing the SHA224 checksum.
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pub fn new224() &Digest {
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mut d := &Digest{}
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d.is224 = true
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d.reset()
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return d
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}
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// write writes the contents of `p_` to the internal hash representation.
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pub fn (mut d Digest) write(p_ []u8) !int {
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unsafe {
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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(mut d.x[d.nx..], p)
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d.nx += n
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if d.nx == sha256.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 = []
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} else {
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p = p[n..]
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}
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}
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if p.len >= sha256.chunk {
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n := p.len & ~(sha256.chunk - 1)
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block(mut d, p[..n])
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if n >= p.len {
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p = []
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} else {
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p = p[n..]
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}
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}
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if p.len > 0 {
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d.nx = copy(mut d.x, p)
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}
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return nn
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}
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}
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// sum returns the SHA256 or SHA224 checksum of digest with the data.
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pub fn (d &Digest) sum(b_in []u8) []u8 {
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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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mut b_out := b_in.clone()
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if d0.is224 {
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for b in hash[..sha256.size224] {
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b_out << b
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}
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} else {
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for b in hash {
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b_out << b
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}
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}
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return b_out
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}
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// checksum returns the current byte checksum of the Digest.
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pub fn (mut d Digest) checksum() []u8 {
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mut len := d.len
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// Padding. Add a 1 bit and 0 bits until 56 bytes mod 64.
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mut tmp := []u8{len: (64)}
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tmp[0] = 0x80
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if int(len) % 64 < 56 {
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d.write(tmp[..56 - int(len) % 64]) or { panic(err) }
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} else {
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d.write(tmp[..64 + 56 - int(len) % 64]) or { panic(err) }
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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, len)
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d.write(tmp[..8]) or { panic(err) }
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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 := []u8{len: sha256.size}
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binary.big_endian_put_u32(mut digest, d.h[0])
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binary.big_endian_put_u32(mut digest[4..], d.h[1])
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binary.big_endian_put_u32(mut digest[8..], d.h[2])
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binary.big_endian_put_u32(mut digest[12..], d.h[3])
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binary.big_endian_put_u32(mut digest[16..], d.h[4])
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binary.big_endian_put_u32(mut digest[20..], d.h[5])
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binary.big_endian_put_u32(mut digest[24..], d.h[6])
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if !d.is224 {
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binary.big_endian_put_u32(mut digest[28..], d.h[7])
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}
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return digest
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}
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// sum returns the SHA256 checksum of the bytes in `data`.
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// Example: assert sha256.sum('V'.bytes()).len > 0 == true
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pub fn sum(data []u8) []u8 {
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return sum256(data)
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}
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// sum256 returns the SHA256 checksum of the data.
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pub fn sum256(data []u8) []u8 {
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mut d := new()
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d.write(data) or { panic(err) }
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return d.checksum()
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}
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// sum224 returns the SHA224 checksum of the data.
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pub fn sum224(data []u8) []u8 {
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mut d := new224()
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d.write(data) or { panic(err) }
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sum := d.checksum()
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mut sum224 := []u8{len: sha256.size224}
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copy(mut sum224, sum[..sha256.size224])
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return sum224
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}
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fn block(mut dig Digest, p []u8) {
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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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// size returns the size of the checksum in bytes.
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pub fn (d &Digest) size() int {
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if !d.is224 {
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return sha256.size
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}
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return sha256.size224
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}
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// block_size returns the block size of the checksum in bytes.
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pub fn (d &Digest) block_size() int {
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return sha256.block_size
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}
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// hexhash returns a hexadecimal SHA256 hash sum `string` of `s`.
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// Example: assert sha256.hexhash('V') == 'de5a6f78116eca62d7fc5ce159d23ae6b889b365a1739ad2cf36f925a140d0cc'
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pub fn hexhash(s string) string {
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return sum256(s.bytes()).hex()
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}
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// hexhash_224 returns a hexadecimal SHA224 hash sum `string` of `s`.
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pub fn hexhash_224(s string) string {
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return sum224(s.bytes()).hex()
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}
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