mirror of
https://github.com/vlang/v.git
synced 2023-08-10 21:13:21 +03:00
125 lines
2.6 KiB
V
125 lines
2.6 KiB
V
// Copyright (c) 2019 Alexander Medvednikov. All rights reserved.
|
|
// Use of this source code is governed by an MIT license
|
|
// that can be found in the LICENSE file.
|
|
|
|
// This is the generic version with no architecture optimizations.
|
|
// In its own file so that an architecture
|
|
// optimized verision can be substituted
|
|
|
|
module sha1
|
|
|
|
import math.bits
|
|
|
|
const (
|
|
_K0 = 0x5A827999
|
|
_K1 = 0x6ED9EBA1
|
|
_K2 = 0x8F1BBCDC
|
|
_K3 = 0xCA62C1D6
|
|
)
|
|
|
|
fn block_generic(dig mut Digest, p_ []byte) {
|
|
mut p := p_
|
|
mut w := [u32(0)].repeat(16)
|
|
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]
|
|
for p.len >= Chunk {
|
|
// Can interlace the computation of w with the
|
|
// rounds below if needed for speed.
|
|
for i := 0; i < 16; i++ {
|
|
j := i * 4
|
|
w[i] = u32(u32(p[j])<<u32(24)) | u32(u32(p[j+1])<<u32(16)) | u32(u32(p[j+2])<<u32(8)) | u32(u32(p[j+3]))
|
|
}
|
|
|
|
mut a := h0
|
|
mut b := h1
|
|
mut c := h2
|
|
mut d := h3
|
|
mut e := h4
|
|
|
|
// Each of the four 20-iteration rounds
|
|
// differs only in the computation of f and
|
|
// the choice of K (_K0, _K1, etc).
|
|
mut i := 0
|
|
for i < 16 {
|
|
f := u32(b&c | (~b)&d)
|
|
t := bits.rotate_left_32(a, 5) + f + e + w[i&0xf] + u32(_K0)
|
|
e = d
|
|
d = c
|
|
c = bits.rotate_left_32(b, 30)
|
|
b = a
|
|
a = t
|
|
i++
|
|
}
|
|
for i < 20 {
|
|
tmp := w[(i-3)&0xf] ^ w[(i-8)&0xf] ^ w[(i-14)&0xf] ^ w[(i)&0xf]
|
|
w[i&0xf] = u32(tmp<<u32(1)) | u32(tmp>>u32(32-1))
|
|
f := b&c | (~b)&d
|
|
t := bits.rotate_left_32(a, 5) + f + e + w[i&0xf] + u32(_K0)
|
|
e = d
|
|
d = c
|
|
c = bits.rotate_left_32(b, 30)
|
|
b = a
|
|
a = t
|
|
i++
|
|
}
|
|
for i < 40 {
|
|
tmp := w[(i-3)&0xf] ^ w[(i-8)&0xf] ^ w[(i-14)&0xf] ^ w[(i)&0xf]
|
|
w[i&0xf] = u32(tmp<<u32(1)) | u32(tmp>>u32(32-1))
|
|
f := b ^ c ^ d
|
|
t := bits.rotate_left_32(a, 5) + f + e + w[i&0xf] + u32(_K1)
|
|
e = d
|
|
d = c
|
|
c = bits.rotate_left_32(b, 30)
|
|
b = a
|
|
a = t
|
|
i++
|
|
}
|
|
for i < 60 {
|
|
tmp := w[(i-3)&0xf] ^ w[(i-8)&0xf] ^ w[(i-14)&0xf] ^ w[(i)&0xf]
|
|
w[i&0xf] = u32(tmp<<u32(1)) | u32(tmp>>u32(32-1))
|
|
f := ((b | c) & d) | (b & c)
|
|
t := bits.rotate_left_32(a, 5) + f + e + w[i&0xf] + u32(_K2)
|
|
e = d
|
|
d = c
|
|
c = bits.rotate_left_32(b, 30)
|
|
b = a
|
|
a = t
|
|
i++
|
|
}
|
|
for i < 80 {
|
|
tmp := w[(i-3)&0xf] ^ w[(i-8)&0xf] ^ w[(i-14)&0xf] ^ w[(i)&0xf]
|
|
w[i&0xf] = u32(tmp<<u32(1)) | u32(tmp>>u32(32-1))
|
|
f := b ^ c ^ d
|
|
t := bits.rotate_left_32(a, 5) + f + e + w[i&0xf] + u32(_K3)
|
|
e = d
|
|
d = c
|
|
c = bits.rotate_left_32(b, 30)
|
|
b = a
|
|
a = t
|
|
i++
|
|
}
|
|
|
|
h0 += a
|
|
h1 += b
|
|
h2 += c
|
|
h3 += d
|
|
h4 += e
|
|
|
|
if Chunk >= p.len {
|
|
p = []byte
|
|
} else {
|
|
p = p.right(Chunk)
|
|
}
|
|
|
|
}
|
|
|
|
dig.h[0] = h0
|
|
dig.h[1] = h1
|
|
dig.h[2] = h2
|
|
dig.h[3] = h3
|
|
dig.h[4] = h4
|
|
}
|