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Perform keccak-f in-place.

master
magical 2014-12-31 15:17:55 -08:00
parent 5ee886a4b3
commit e40b3562fb
2 changed files with 6 additions and 9 deletions
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8
keccak.go
View File

@ -1,10 +1,10 @@
package keccak package keccak
// roundGeneric implements one round of the keccak-f[1600] permutation. // roundGeneric implements one round of the keccak-f[1600] permutation.
func roundGeneric(a [5][5]uint64) [5][5]uint64 { func roundGeneric(a *[5][5]uint64) {
// Theta // Theta
var c [5]uint64 var c [5]uint64
for x := range a { for x := range *a {
c[x] = a[0][x] ^ a[1][x] ^ a[2][x] ^ a[3][x] ^ a[4][x] c[x] = a[0][x] ^ a[1][x] ^ a[2][x] ^ a[3][x] ^ a[4][x]
} }
for x := range a[0] { for x := range a[0] {
@ -18,7 +18,7 @@ func roundGeneric(a [5][5]uint64) [5][5]uint64 {
// Rho and pi // Rho and pi
var b [5][5]uint64 var b [5][5]uint64
for y := range a { for y := range *a {
for x := range a[0] { for x := range a[0] {
x0 := y x0 := y
y0 := (x*2 + y*3) % 5 y0 := (x*2 + y*3) % 5
@ -35,8 +35,6 @@ func roundGeneric(a [5][5]uint64) [5][5]uint64 {
a[y][3] = b[y][3] ^ ^c[4] & c[0] a[y][3] = b[y][3] ^ ^c[4] & c[0]
a[y][4] = b[y][4] ^ ^c[0] & c[1] a[y][4] = b[y][4] ^ ^c[0] & c[1]
} }
return a
} }

7
sponge.go
View File

@ -49,16 +49,15 @@ loop:
b = b[8:] b = b[8:]
} }
} }
d.a = keccakf(d.a) keccakf(&d.a)
d.len = 0 d.len = 0
} }
func keccakf(a [5][5]uint64) [5][5]uint64 { func keccakf(a *[5][5]uint64) {
for i := 0; i < 24; i++ { for i := 0; i < 24; i++ {
a = roundGeneric(a) roundGeneric(a)
a[0][0] ^= RC[i] a[0][0] ^= RC[i]
} }
return a
} }
func (d0 *digest) Sum(b []byte) []byte { func (d0 *digest) Sum(b []byte) []byte {