155 lines
2.9 KiB
V
155 lines
2.9 KiB
V
// Copyright (c) 2019-2021 Alexander Medvednikov. All rights reserved.
|
|
// Use of this source code is governed by an MIT license
|
|
// that can be found in the LICENSE file.
|
|
// SHA256 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 sha256
|
|
|
|
import math.bits
|
|
|
|
const (
|
|
_k = [
|
|
0x428a2f98,
|
|
0x71374491,
|
|
0xb5c0fbcf,
|
|
0xe9b5dba5,
|
|
0x3956c25b,
|
|
0x59f111f1,
|
|
0x923f82a4,
|
|
0xab1c5ed5,
|
|
0xd807aa98,
|
|
0x12835b01,
|
|
0x243185be,
|
|
0x550c7dc3,
|
|
0x72be5d74,
|
|
0x80deb1fe,
|
|
0x9bdc06a7,
|
|
0xc19bf174,
|
|
0xe49b69c1,
|
|
0xefbe4786,
|
|
0x0fc19dc6,
|
|
0x240ca1cc,
|
|
0x2de92c6f,
|
|
0x4a7484aa,
|
|
0x5cb0a9dc,
|
|
0x76f988da,
|
|
0x983e5152,
|
|
0xa831c66d,
|
|
0xb00327c8,
|
|
0xbf597fc7,
|
|
0xc6e00bf3,
|
|
0xd5a79147,
|
|
0x06ca6351,
|
|
0x14292967,
|
|
0x27b70a85,
|
|
0x2e1b2138,
|
|
0x4d2c6dfc,
|
|
0x53380d13,
|
|
0x650a7354,
|
|
0x766a0abb,
|
|
0x81c2c92e,
|
|
0x92722c85,
|
|
0xa2bfe8a1,
|
|
0xa81a664b,
|
|
0xc24b8b70,
|
|
0xc76c51a3,
|
|
0xd192e819,
|
|
0xd6990624,
|
|
0xf40e3585,
|
|
0x106aa070,
|
|
0x19a4c116,
|
|
0x1e376c08,
|
|
0x2748774c,
|
|
0x34b0bcb5,
|
|
0x391c0cb3,
|
|
0x4ed8aa4a,
|
|
0x5b9cca4f,
|
|
0x682e6ff3,
|
|
0x748f82ee,
|
|
0x78a5636f,
|
|
0x84c87814,
|
|
0x8cc70208,
|
|
0x90befffa,
|
|
0xa4506ceb,
|
|
0xbef9a3f7,
|
|
0xc67178f2,
|
|
]
|
|
)
|
|
|
|
fn block_generic(mut dig Digest, p_ []byte) {
|
|
unsafe {
|
|
mut p := p_
|
|
mut w := []u32{len: (64)}
|
|
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 {
|
|
// Can interlace the computation of w with the
|
|
// rounds below if needed for speed.
|
|
for i in 0 .. 16 {
|
|
j := i * 4
|
|
w[i] = u32(p[j] << 24) | u32(p[j + 1] << 16) | u32(p[j + 2] << 8) | u32(p[j + 3])
|
|
}
|
|
for i := 16; i < 64; i++ {
|
|
v1 := w[i - 2]
|
|
t1 := (bits.rotate_left_32(v1, -17)) ^ (bits.rotate_left_32(v1, -19)) ^ (v1 >> 10)
|
|
v2 := w[i - 15]
|
|
t2 := (bits.rotate_left_32(v2, -7)) ^ (bits.rotate_left_32(v2, -18)) ^ (v2 >> 3)
|
|
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 .. 64 {
|
|
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]
|
|
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))
|
|
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
|
|
}
|
|
}
|