164 lines
3.5 KiB
V
164 lines
3.5 KiB
V
// Copyright (c) 2019-2020 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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// SHA512 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 sha512
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import math.bits
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const (
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_k = [0x428a2f98d728ae22,
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0x7137449123ef65cd,
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0xb5c0fbcfec4d3b2f,
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0xe9b5dba58189dbbc,
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0x3956c25bf348b538,
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0x59f111f1b605d019,
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0x923f82a4af194f9b,
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0xab1c5ed5da6d8118,
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0xd807aa98a3030242,
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0x12835b0145706fbe,
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0x243185be4ee4b28c,
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0x550c7dc3d5ffb4e2,
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0x72be5d74f27b896f,
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0x80deb1fe3b1696b1,
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0x9bdc06a725c71235,
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0xc19bf174cf692694,
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0xe49b69c19ef14ad2,
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0xefbe4786384f25e3,
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0x0fc19dc68b8cd5b5,
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0x240ca1cc77ac9c65,
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0x2de92c6f592b0275,
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0x4a7484aa6ea6e483,
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0x5cb0a9dcbd41fbd4,
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0x76f988da831153b5,
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0x983e5152ee66dfab,
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0xa831c66d2db43210,
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0xb00327c898fb213f,
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0xbf597fc7beef0ee4,
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0xc6e00bf33da88fc2,
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0xd5a79147930aa725,
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0x06ca6351e003826f,
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0x142929670a0e6e70,
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0x27b70a8546d22ffc,
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0x2e1b21385c26c926,
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0x4d2c6dfc5ac42aed,
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0x53380d139d95b3df,
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0x650a73548baf63de,
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0x766a0abb3c77b2a8,
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0x81c2c92e47edaee6,
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0x92722c851482353b,
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0xa2bfe8a14cf10364,
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0xa81a664bbc423001,
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0xc24b8b70d0f89791,
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0xc76c51a30654be30,
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0xd192e819d6ef5218,
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0xd69906245565a910,
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0xf40e35855771202a,
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0x106aa07032bbd1b8,
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0x19a4c116b8d2d0c8,
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0x1e376c085141ab53,
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0x2748774cdf8eeb99,
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0x34b0bcb5e19b48a8,
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0x391c0cb3c5c95a63,
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0x4ed8aa4ae3418acb,
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0x5b9cca4f7763e373,
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0x682e6ff3d6b2b8a3,
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0x748f82ee5defb2fc,
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0x78a5636f43172f60,
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0x84c87814a1f0ab72,
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0x8cc702081a6439ec,
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0x90befffa23631e28,
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0xa4506cebde82bde9,
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0xbef9a3f7b2c67915,
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0xc67178f2e372532b,
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0xca273eceea26619c,
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0xd186b8c721c0c207,
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0xeada7dd6cde0eb1e,
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0xf57d4f7fee6ed178,
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0x06f067aa72176fba,
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0x0a637dc5a2c898a6,
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0x113f9804bef90dae,
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0x1b710b35131c471b,
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0x28db77f523047d84,
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0x32caab7b40c72493,
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0x3c9ebe0a15c9bebc,
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0x431d67c49c100d4c,
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0x4cc5d4becb3e42b6,
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0x597f299cfc657e2a,
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0x5fcb6fab3ad6faec,
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0x6c44198c4a475817,
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]
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)
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fn block_generic(dig mut Digest, p_ []byte) {
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mut p := p_
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mut w := [u64(0)].repeat(80)
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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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for i in 0..16 {
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j := i * 8
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w[i] = (u64(p[j])<<56) | (u64(p[j + 1])<<48) | (u64(p[j + 2])<<40) | (u64(p[j + 3])<<32) | (u64(p[j + 4])<<24) | (u64(p[j + 5])<<16) | (u64(p[j + 6])<<8) | u64(p[j + 7])
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}
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for i := 16; i < 80; i++ {
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v1 := w[i - 2]
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t1 := bits.rotate_left_64(v1, -19) ^ bits.rotate_left_64(v1, -61) ^ (v1>>6)
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v2 := w[i - 15]
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t2 := bits.rotate_left_64(v2, -1) ^ bits.rotate_left_64(v2, -8) ^ (v2>>7)
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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 in 0..80 {
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t1 := h + (bits.rotate_left_64(e, -14) ^ bits.rotate_left_64(e, -18) ^ bits.rotate_left_64(e, -41)) + ((e & f) ^ (~e & g)) + _k[i] + w[i]
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t2 := (bits.rotate_left_64(a, -28) ^ bits.rotate_left_64(a, -34) ^ bits.rotate_left_64(a, -39)) + ((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 = []
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}
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else {
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p = p[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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