forked from golang/hotime
166 lines
4.3 KiB
Go
166 lines
4.3 KiB
Go
// Copyright 2010 The Go Authors. All rights reserved.
|
|
// Use of this source code is governed by a BSD-style
|
|
// license that can be found in the LICENSE file.
|
|
|
|
// RIPEMD-160 block step.
|
|
// In its own file so that a faster assembly or C version
|
|
// can be substituted easily.
|
|
|
|
package ripemd160
|
|
|
|
import (
|
|
"math/bits"
|
|
)
|
|
|
|
// work buffer indices and roll amounts for one line
|
|
var _n = [80]uint{
|
|
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
|
|
7, 4, 13, 1, 10, 6, 15, 3, 12, 0, 9, 5, 2, 14, 11, 8,
|
|
3, 10, 14, 4, 9, 15, 8, 1, 2, 7, 0, 6, 13, 11, 5, 12,
|
|
1, 9, 11, 10, 0, 8, 12, 4, 13, 3, 7, 15, 14, 5, 6, 2,
|
|
4, 0, 5, 9, 7, 12, 2, 10, 14, 1, 3, 8, 11, 6, 15, 13,
|
|
}
|
|
|
|
var _r = [80]uint{
|
|
11, 14, 15, 12, 5, 8, 7, 9, 11, 13, 14, 15, 6, 7, 9, 8,
|
|
7, 6, 8, 13, 11, 9, 7, 15, 7, 12, 15, 9, 11, 7, 13, 12,
|
|
11, 13, 6, 7, 14, 9, 13, 15, 14, 8, 13, 6, 5, 12, 7, 5,
|
|
11, 12, 14, 15, 14, 15, 9, 8, 9, 14, 5, 6, 8, 6, 5, 12,
|
|
9, 15, 5, 11, 6, 8, 13, 12, 5, 12, 13, 14, 11, 8, 5, 6,
|
|
}
|
|
|
|
// same for the other parallel one
|
|
var n_ = [80]uint{
|
|
5, 14, 7, 0, 9, 2, 11, 4, 13, 6, 15, 8, 1, 10, 3, 12,
|
|
6, 11, 3, 7, 0, 13, 5, 10, 14, 15, 8, 12, 4, 9, 1, 2,
|
|
15, 5, 1, 3, 7, 14, 6, 9, 11, 8, 12, 2, 10, 0, 4, 13,
|
|
8, 6, 4, 1, 3, 11, 15, 0, 5, 12, 2, 13, 9, 7, 10, 14,
|
|
12, 15, 10, 4, 1, 5, 8, 7, 6, 2, 13, 14, 0, 3, 9, 11,
|
|
}
|
|
|
|
var r_ = [80]uint{
|
|
8, 9, 9, 11, 13, 15, 15, 5, 7, 7, 8, 11, 14, 14, 12, 6,
|
|
9, 13, 15, 7, 12, 8, 9, 11, 7, 7, 12, 7, 6, 15, 13, 11,
|
|
9, 7, 15, 11, 8, 6, 6, 14, 12, 13, 5, 14, 13, 13, 7, 5,
|
|
15, 5, 8, 11, 14, 14, 6, 14, 6, 9, 12, 9, 12, 5, 15, 8,
|
|
8, 5, 12, 9, 12, 5, 14, 6, 8, 13, 6, 5, 15, 13, 11, 11,
|
|
}
|
|
|
|
func _Block(md *digest, p []byte) int {
|
|
n := 0
|
|
var x [16]uint32
|
|
var alpha, beta uint32
|
|
for len(p) >= BlockSize {
|
|
a, b, c, d, e := md.s[0], md.s[1], md.s[2], md.s[3], md.s[4]
|
|
aa, bb, cc, dd, ee := a, b, c, d, e
|
|
j := 0
|
|
for i := 0; i < 16; i++ {
|
|
x[i] = uint32(p[j]) | uint32(p[j+1])<<8 | uint32(p[j+2])<<16 | uint32(p[j+3])<<24
|
|
j += 4
|
|
}
|
|
|
|
// round 1
|
|
i := 0
|
|
for i < 16 {
|
|
alpha = a + (b ^ c ^ d) + x[_n[i]]
|
|
s := int(_r[i])
|
|
alpha = bits.RotateLeft32(alpha, s) + e
|
|
beta = bits.RotateLeft32(c, 10)
|
|
a, b, c, d, e = e, alpha, b, beta, d
|
|
|
|
// parallel line
|
|
alpha = aa + (bb ^ (cc | ^dd)) + x[n_[i]] + 0x50a28be6
|
|
s = int(r_[i])
|
|
alpha = bits.RotateLeft32(alpha, s) + ee
|
|
beta = bits.RotateLeft32(cc, 10)
|
|
aa, bb, cc, dd, ee = ee, alpha, bb, beta, dd
|
|
|
|
i++
|
|
}
|
|
|
|
// round 2
|
|
for i < 32 {
|
|
alpha = a + (b&c | ^b&d) + x[_n[i]] + 0x5a827999
|
|
s := int(_r[i])
|
|
alpha = bits.RotateLeft32(alpha, s) + e
|
|
beta = bits.RotateLeft32(c, 10)
|
|
a, b, c, d, e = e, alpha, b, beta, d
|
|
|
|
// parallel line
|
|
alpha = aa + (bb&dd | cc&^dd) + x[n_[i]] + 0x5c4dd124
|
|
s = int(r_[i])
|
|
alpha = bits.RotateLeft32(alpha, s) + ee
|
|
beta = bits.RotateLeft32(cc, 10)
|
|
aa, bb, cc, dd, ee = ee, alpha, bb, beta, dd
|
|
|
|
i++
|
|
}
|
|
|
|
// round 3
|
|
for i < 48 {
|
|
alpha = a + (b | ^c ^ d) + x[_n[i]] + 0x6ed9eba1
|
|
s := int(_r[i])
|
|
alpha = bits.RotateLeft32(alpha, s) + e
|
|
beta = bits.RotateLeft32(c, 10)
|
|
a, b, c, d, e = e, alpha, b, beta, d
|
|
|
|
// parallel line
|
|
alpha = aa + (bb | ^cc ^ dd) + x[n_[i]] + 0x6d703ef3
|
|
s = int(r_[i])
|
|
alpha = bits.RotateLeft32(alpha, s) + ee
|
|
beta = bits.RotateLeft32(cc, 10)
|
|
aa, bb, cc, dd, ee = ee, alpha, bb, beta, dd
|
|
|
|
i++
|
|
}
|
|
|
|
// round 4
|
|
for i < 64 {
|
|
alpha = a + (b&d | c&^d) + x[_n[i]] + 0x8f1bbcdc
|
|
s := int(_r[i])
|
|
alpha = bits.RotateLeft32(alpha, s) + e
|
|
beta = bits.RotateLeft32(c, 10)
|
|
a, b, c, d, e = e, alpha, b, beta, d
|
|
|
|
// parallel line
|
|
alpha = aa + (bb&cc | ^bb&dd) + x[n_[i]] + 0x7a6d76e9
|
|
s = int(r_[i])
|
|
alpha = bits.RotateLeft32(alpha, s) + ee
|
|
beta = bits.RotateLeft32(cc, 10)
|
|
aa, bb, cc, dd, ee = ee, alpha, bb, beta, dd
|
|
|
|
i++
|
|
}
|
|
|
|
// round 5
|
|
for i < 80 {
|
|
alpha = a + (b ^ (c | ^d)) + x[_n[i]] + 0xa953fd4e
|
|
s := int(_r[i])
|
|
alpha = bits.RotateLeft32(alpha, s) + e
|
|
beta = bits.RotateLeft32(c, 10)
|
|
a, b, c, d, e = e, alpha, b, beta, d
|
|
|
|
// parallel line
|
|
alpha = aa + (bb ^ cc ^ dd) + x[n_[i]]
|
|
s = int(r_[i])
|
|
alpha = bits.RotateLeft32(alpha, s) + ee
|
|
beta = bits.RotateLeft32(cc, 10)
|
|
aa, bb, cc, dd, ee = ee, alpha, bb, beta, dd
|
|
|
|
i++
|
|
}
|
|
|
|
// combine results
|
|
dd += c + md.s[1]
|
|
md.s[1] = md.s[2] + d + ee
|
|
md.s[2] = md.s[3] + e + aa
|
|
md.s[3] = md.s[4] + a + bb
|
|
md.s[4] = md.s[0] + b + cc
|
|
md.s[0] = dd
|
|
|
|
p = p[BlockSize:]
|
|
n += BlockSize
|
|
}
|
|
return n
|
|
}
|