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// 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(sha256._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
}
}
|
