mirror of
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122 lines
2.5 KiB
Go
122 lines
2.5 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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// This is a generic implementation with no arch optimizations
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module sha1
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import math.bits
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const (
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_K0 = 0x5A827999
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_K1 = 0x6ED9EBA1
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_K2 = 0x8F1BBCDC
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_K3 = 0xCA62C1D6
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)
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fn block_generic(dig &Digest, p []byte) {
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mut w := [u32(0); 16]
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mut h0 := dig.h[0]
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mut h1 := dig.h[1]
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mut h2 := dig.h[2]
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mut h3 := dig.h[3]
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mut h4 := dig.h[4]
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for p.len >= Chunk {
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// Can interlace the computation of w with the
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// rounds below if needed for speed.
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for i := 0; i < 16; i++ {
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j := i * 4
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w[i] = u32(u32(p[j])<<u32(24)) | u32(u32(p[j+1])<<u32(16)) | u32(u32(p[j+2])<<u32(8)) | u32(u32(p[j+3]))
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}
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mut a := h0
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mut b := h1
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mut c := h2
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mut d := h3
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mut e := h4
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// Each of the four 20-iteration rounds
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// differs only in the computation of f and
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// the choice of K (_K0, _K1, etc).
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mut i := 0
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for i < 16 {
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f := u32(b&c | (~b)&d)
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t := bits.rotate_left_32(a, 5) + f + e + w[i&0xf] + u32(_K0)
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e = d
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d = c
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c = bits.rotate_left_32(b, 30)
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b = a
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a = t
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i++
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}
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for i < 20 {
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tmp := w[(i-3)&0xf] ^ w[(i-8)&0xf] ^ w[(i-14)&0xf] ^ w[(i)&0xf]
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w[i&0xf] = u32(tmp<<u32(1)) | u32(tmp>>u32(32-1))
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f := b&c | (~b)&d
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t := bits.rotate_left_32(a, 5) + f + e + w[i&0xf] + u32(_K0)
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e = d
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d = c
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c = bits.rotate_left_32(b, 30)
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b = a
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a = t
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i++
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}
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for i < 40 {
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tmp := w[(i-3)&0xf] ^ w[(i-8)&0xf] ^ w[(i-14)&0xf] ^ w[(i)&0xf]
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w[i&0xf] = u32(tmp<<u32(1)) | u32(tmp>>u32(32-1))
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f := b ^ c ^ d
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t := bits.rotate_left_32(a, 5) + f + e + w[i&0xf] + u32(_K1)
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e = d
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d = c
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c = bits.rotate_left_32(b, 30)
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b = a
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a = t
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i++
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}
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for i < 60 {
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tmp := w[(i-3)&0xf] ^ w[(i-8)&0xf] ^ w[(i-14)&0xf] ^ w[(i)&0xf]
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w[i&0xf] = u32(tmp<<u32(1)) | u32(tmp>>u32(32-1))
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f := ((b | c) & d) | (b & c)
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t := bits.rotate_left_32(a, 5) + f + e + w[i&0xf] + u32(_K2)
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e = d
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d = c
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c = bits.rotate_left_32(b, 30)
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b = a
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a = t
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i++
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}
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for i < 80 {
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tmp := w[(i-3)&0xf] ^ w[(i-8)&0xf] ^ w[(i-14)&0xf] ^ w[(i)&0xf]
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w[i&0xf] = u32(tmp<<u32(1)) | u32(tmp>>u32(32-1))
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f := b ^ c ^ d
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t := bits.rotate_left_32(a, 5) + f + e + w[i&0xf] + u32(_K3)
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e = d
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d = c
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c = bits.rotate_left_32(b, 30)
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b = a
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a = t
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i++
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}
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h0 += a
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h1 += b
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h2 += c
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h3 += d
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h4 += e
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if Chunk >= p.len {
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p = []byte
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} else {
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p = p.right(Chunk)
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}
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}
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dig.h[0] = h0
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dig.h[1] = h1
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dig.h[2] = h2
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dig.h[3] = h3
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dig.h[4] = h4
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}
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