diff options
Diffstat (limited to 'libgo/go/crypto/sha1/sha1block.go')
| -rw-r--r-- | libgo/go/crypto/sha1/sha1block.go | 42 |
1 files changed, 28 insertions, 14 deletions
diff --git a/libgo/go/crypto/sha1/sha1block.go b/libgo/go/crypto/sha1/sha1block.go index b9fe21d9e3d..1c9507c68e5 100644 --- a/libgo/go/crypto/sha1/sha1block.go +++ b/libgo/go/crypto/sha1/sha1block.go @@ -16,7 +16,7 @@ const ( ) func block(dig *digest, p []byte) { - var w [80]uint32 + 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 { @@ -26,42 +26,56 @@ func block(dig *digest, p []byte) { j := i * 4 w[i] = uint32(p[j])<<24 | uint32(p[j+1])<<16 | uint32(p[j+2])<<8 | uint32(p[j+3]) } - for i := 16; i < 80; i++ { - tmp := w[i-3] ^ w[i-8] ^ w[i-14] ^ w[i-16] - w[i] = tmp<<1 | tmp>>(32-1) - } 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). - for i := 0; i < 20; i++ { + 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] + _K0 + t := a5 + f + e + w[i&0xf] + _K0 a, b, c, d, e = t, a, b30, c, d } - for i := 20; i < 40; i++ { + 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] + _K1 + t := a5 + f + e + w[i&0xf] + _K1 a, b, c, d, e = t, a, b30, c, d } - for i := 40; i < 60; i++ { - f := b&c | b&d | 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] + _K2 + t := a5 + f + e + w[i&0xf] + _K2 a, b, c, d, e = t, a, b30, c, d } - for i := 60; i < 80; i++ { + 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] + _K3 + t := a5 + f + e + w[i&0xf] + _K3 a, b, c, d, e = t, a, b30, c, d } |