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v/vlib/crypto/sha512/sha512block_generic.v
2020-02-24 17:55:16 +01:00

164 lines
3.5 KiB
V

// Copyright (c) 2019-2020 Alexander Medvednikov. All rights reserved.
// Use of this source code is governed by an MIT license
// that can be found in the LICENSE file.
// SHA512 block step.
// This is the generic version with no architecture optimizations.
// In its own file so that an architecture
// optimized verision can be substituted
module sha512
import math.bits
const (
_k = [0x428a2f98d728ae22,
0x7137449123ef65cd,
0xb5c0fbcfec4d3b2f,
0xe9b5dba58189dbbc,
0x3956c25bf348b538,
0x59f111f1b605d019,
0x923f82a4af194f9b,
0xab1c5ed5da6d8118,
0xd807aa98a3030242,
0x12835b0145706fbe,
0x243185be4ee4b28c,
0x550c7dc3d5ffb4e2,
0x72be5d74f27b896f,
0x80deb1fe3b1696b1,
0x9bdc06a725c71235,
0xc19bf174cf692694,
0xe49b69c19ef14ad2,
0xefbe4786384f25e3,
0x0fc19dc68b8cd5b5,
0x240ca1cc77ac9c65,
0x2de92c6f592b0275,
0x4a7484aa6ea6e483,
0x5cb0a9dcbd41fbd4,
0x76f988da831153b5,
0x983e5152ee66dfab,
0xa831c66d2db43210,
0xb00327c898fb213f,
0xbf597fc7beef0ee4,
0xc6e00bf33da88fc2,
0xd5a79147930aa725,
0x06ca6351e003826f,
0x142929670a0e6e70,
0x27b70a8546d22ffc,
0x2e1b21385c26c926,
0x4d2c6dfc5ac42aed,
0x53380d139d95b3df,
0x650a73548baf63de,
0x766a0abb3c77b2a8,
0x81c2c92e47edaee6,
0x92722c851482353b,
0xa2bfe8a14cf10364,
0xa81a664bbc423001,
0xc24b8b70d0f89791,
0xc76c51a30654be30,
0xd192e819d6ef5218,
0xd69906245565a910,
0xf40e35855771202a,
0x106aa07032bbd1b8,
0x19a4c116b8d2d0c8,
0x1e376c085141ab53,
0x2748774cdf8eeb99,
0x34b0bcb5e19b48a8,
0x391c0cb3c5c95a63,
0x4ed8aa4ae3418acb,
0x5b9cca4f7763e373,
0x682e6ff3d6b2b8a3,
0x748f82ee5defb2fc,
0x78a5636f43172f60,
0x84c87814a1f0ab72,
0x8cc702081a6439ec,
0x90befffa23631e28,
0xa4506cebde82bde9,
0xbef9a3f7b2c67915,
0xc67178f2e372532b,
0xca273eceea26619c,
0xd186b8c721c0c207,
0xeada7dd6cde0eb1e,
0xf57d4f7fee6ed178,
0x06f067aa72176fba,
0x0a637dc5a2c898a6,
0x113f9804bef90dae,
0x1b710b35131c471b,
0x28db77f523047d84,
0x32caab7b40c72493,
0x3c9ebe0a15c9bebc,
0x431d67c49c100d4c,
0x4cc5d4becb3e42b6,
0x597f299cfc657e2a,
0x5fcb6fab3ad6faec,
0x6c44198c4a475817,
]
)
fn block_generic(dig mut Digest, p_ []byte) {
mut p := p_
mut w := [u64(0)].repeat(80)
mut h0 := dig.h[0]
mut h1 := dig.h[1]
mut h2 := dig.h[2]
mut h3 := dig.h[3]
mut h4 := dig.h[4]
mut h5 := dig.h[5]
mut h6 := dig.h[6]
mut h7 := dig.h[7]
for p.len >= Chunk {
for i in 0..16 {
j := i * 8
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])
}
for i := 16; i < 80; i++ {
v1 := w[i - 2]
t1 := bits.rotate_left_64(v1, -19) ^ bits.rotate_left_64(v1, -61) ^ (v1>>6)
v2 := w[i - 15]
t2 := bits.rotate_left_64(v2, -1) ^ bits.rotate_left_64(v2, -8) ^ (v2>>7)
w[i] = t1 + w[i - 7] + t2 + w[i - 16]
}
mut a := h0
mut b := h1
mut c := h2
mut d := h3
mut e := h4
mut f := h5
mut g := h6
mut h := h7
for i in 0..80 {
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]
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))
h = g
g = f
f = e
e = d + t1
d = c
c = b
b = a
a = t1 + t2
}
h0 += a
h1 += b
h2 += c
h3 += d
h4 += e
h5 += f
h6 += g
h7 += h
if Chunk >= p.len {
p = []
}
else {
p = p[Chunk..]
}
}
dig.h[0] = h0
dig.h[1] = h1
dig.h[2] = h2
dig.h[3] = h3
dig.h[4] = h4
dig.h[5] = h5
dig.h[6] = h6
dig.h[7] = h7
}