You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
88 lines
2.2 KiB
88 lines
2.2 KiB
10 years ago
|
// +build amd64
|
||
|
|
|
||
|
|
package sha1
|
||
|
|
|
||
|
|
const (
|
||
|
|
_K0 = 0x5A827999
|
||
|
|
_K1 = 0x6ED9EBA1
|
||
|
|
_K2 = 0x8F1BBCDC
|
||
|
|
_K3 = 0xCA62C1D6
|
||
|
|
)
|
||
|
|
|
||
|
|
// blockGeneric is a portable, pure Go version of the SHA1 block step.
|
||
|
|
// It's used by sha1block_generic.go and tests.
|
||
|
|
func blockGeneric(dig *digest, p []byte) {
|
||
|
|
var w [16]uint32
|
||
|
|
|
||
|
|
h0, h1, h2, h3, h4 := dig.h[0], dig.h[1], dig.h[2], dig.h[3], dig.h[4]
|
||
|
|
for len(p) >= 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] = uint32(p[j])<<24 | uint32(p[j+1])<<16 | uint32(p[j+2])<<8 | uint32(p[j+3])
|
||
|
|
}
|
||
|
|
|
||
|
|
a, b, c, d, e := h0, h1, h2, h3, h4
|
||
|
|
|
||
|
|
// Each of the four 20-iteration rounds
|
||
|
|
// differs only in the computation of f and
|
||
|
|
// the choice of K (_K0, _K1, etc).
|
||
|
|
i := 0
|
||
|
|
for ; i < 16; i++ {
|
||
|
|
f := b&c | (^b)&d
|
||
|
|
a5 := a<<5 | a>>(32-5)
|
||
|
|
b30 := b<<30 | b>>(32-30)
|
||
|
|
t := a5 + f + e + w[i&0xf] + _K0
|
||
|
|
a, b, c, d, e = t, a, b30, c, d
|
||
|
|
}
|
||
|
|
for ; i < 20; i++ {
|
||
|
|
tmp := w[(i-3)&0xf] ^ w[(i-8)&0xf] ^ w[(i-14)&0xf] ^ w[(i)&0xf]
|
||
|
|
w[i&0xf] = tmp<<1 | tmp>>(32-1)
|
||
|
|
|
||
|
|
f := b&c | (^b)&d
|
||
|
|
a5 := a<<5 | a>>(32-5)
|
||
|
|
b30 := b<<30 | b>>(32-30)
|
||
|
|
t := a5 + f + e + w[i&0xf] + _K0
|
||
|
|
a, b, c, d, e = t, a, b30, c, d
|
||
|
|
}
|
||
|
|
for ; i < 40; i++ {
|
||
|
|
tmp := w[(i-3)&0xf] ^ w[(i-8)&0xf] ^ w[(i-14)&0xf] ^ w[(i)&0xf]
|
||
|
|
w[i&0xf] = tmp<<1 | tmp>>(32-1)
|
||
|
|
f := b ^ c ^ d
|
||
|
|
a5 := a<<5 | a>>(32-5)
|
||
|
|
b30 := b<<30 | b>>(32-30)
|
||
|
|
t := a5 + f + e + w[i&0xf] + _K1
|
||
|
|
a, b, c, d, e = t, a, b30, c, d
|
||
|
|
}
|
||
|
|
for ; i < 60; i++ {
|
||
|
|
tmp := w[(i-3)&0xf] ^ w[(i-8)&0xf] ^ w[(i-14)&0xf] ^ w[(i)&0xf]
|
||
|
|
w[i&0xf] = tmp<<1 | tmp>>(32-1)
|
||
|
|
f := ((b | c) & d) | (b & c)
|
||
|
|
|
||
|
|
a5 := a<<5 | a>>(32-5)
|
||
|
|
b30 := b<<30 | b>>(32-30)
|
||
|
|
t := a5 + f + e + w[i&0xf] + _K2
|
||
|
|
a, b, c, d, e = t, a, b30, c, d
|
||
|
|
}
|
||
|
|
for ; i < 80; i++ {
|
||
|
|
tmp := w[(i-3)&0xf] ^ w[(i-8)&0xf] ^ w[(i-14)&0xf] ^ w[(i)&0xf]
|
||
|
|
w[i&0xf] = tmp<<1 | tmp>>(32-1)
|
||
|
|
f := b ^ c ^ d
|
||
|
|
a5 := a<<5 | a>>(32-5)
|
||
|
|
b30 := b<<30 | b>>(32-30)
|
||
|
|
t := a5 + f + e + w[i&0xf] + _K3
|
||
|
|
a, b, c, d, e = t, a, b30, c, d
|
||
|
|
}
|
||
|
|
|
||
|
|
h0 += a
|
||
|
|
h1 += b
|
||
|
|
h2 += c
|
||
|
|
h3 += d
|
||
|
|
h4 += e
|
||
|
|
|
||
|
|
p = p[chunk:]
|
||
|
|
}
|
||
|
|
dig.h[0], dig.h[1], dig.h[2], dig.h[3], dig.h[4] = h0, h1, h2, h3, h4
|
||
|
|
}
|