159 lines
3.0 KiB
Go
159 lines
3.0 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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// SHA256 block step.
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// This is the generic version with no architecture optimizations.
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// In its own file so that an architecture
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// optimized verision can be substituted
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module sha256
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import math.bits
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const (
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_K = [
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0x428a2f98,
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0x71374491,
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0xb5c0fbcf,
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0xe9b5dba5,
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0x3956c25b,
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0x59f111f1,
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0x923f82a4,
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0xab1c5ed5,
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0xd807aa98,
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0x12835b01,
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0x243185be,
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0x550c7dc3,
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0x72be5d74,
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0x80deb1fe,
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0x9bdc06a7,
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0xc19bf174,
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0xe49b69c1,
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0xefbe4786,
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0x0fc19dc6,
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0x240ca1cc,
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0x2de92c6f,
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0x4a7484aa,
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0x5cb0a9dc,
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0x76f988da,
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0x983e5152,
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0xa831c66d,
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0xb00327c8,
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0xbf597fc7,
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0xc6e00bf3,
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0xd5a79147,
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0x06ca6351,
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0x14292967,
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0x27b70a85,
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0x2e1b2138,
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0x4d2c6dfc,
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0x53380d13,
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0x650a7354,
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0x766a0abb,
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0x81c2c92e,
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0x92722c85,
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0xa2bfe8a1,
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0xa81a664b,
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0xc24b8b70,
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0xc76c51a3,
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0xd192e819,
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0xd6990624,
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0xf40e3585,
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0x106aa070,
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0x19a4c116,
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0x1e376c08,
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0x2748774c,
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0x34b0bcb5,
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0x391c0cb3,
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0x4ed8aa4a,
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0x5b9cca4f,
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0x682e6ff3,
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0x748f82ee,
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0x78a5636f,
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0x84c87814,
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0x8cc70208,
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0x90befffa,
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0xa4506ceb,
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0xbef9a3f7,
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0xc67178f2,
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]
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)
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fn block_generic(dig &Digest, p []byte) {
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mut w := [u32(0); 64]
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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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mut h5 := dig.h[5]
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mut h6 := dig.h[6]
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mut h7 := dig.h[7]
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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(p[j+3])
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}
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for i := 16; i < 64; i++ {
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v1 := w[i-2]
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t1 := (bits.rotate_left_32(v1, -17)) ^ (bits.rotate_left_32(v1, -19)) ^ u32((v1 >> u32(10)))
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v2 := w[i-15]
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t2 := (bits.rotate_left_32(v2, -7)) ^ (bits.rotate_left_32(v2, -18)) ^ u32((v2 >> u32(3)))
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w[i] = t1 + w[i-7] + t2 + w[i-16]
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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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mut f := h5
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mut g := h6
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mut h := h7
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for i := 0; i < 64; i++ {
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t1 := h + ((bits.rotate_left_32(e, -6)) ^ (bits.rotate_left_32(e, -11)) ^ (bits.rotate_left_32(e, -25))) + ((e & f) ^ (~e & g)) + u32(_K[i]) + w[i]
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t2 := ((bits.rotate_left_32(a, -2)) ^ (bits.rotate_left_32(a, -13)) ^ (bits.rotate_left_32(a, -22))) + ((a & b) ^ (a & c) ^ (b & c))
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h = g
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g = f
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f = e
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e = d + t1
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d = c
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c = b
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b = a
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a = t1 + t2
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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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h5 += f
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h6 += g
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h7 += h
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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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dig.h[5] = h5
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dig.h[6] = h6
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dig.h[7] = h7
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}
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