path: root/crypto/sha3/xor_unaligned.go

// Copyright 2015 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.

// +build amd64 386
// +build !appengine

package sha3

import "unsafe"

func xorInUnaligned(d *state, buf []byte) {
    bw := (*[maxRate / 8]uint64)(unsafe.Pointer(&buf[0]))
    n := len(buf)
    if n >= 72 {
        d.a[0] ^= bw[0]
        d.a[1] ^= bw[1]
        d.a[2] ^= bw[2]
        d.a[3] ^= bw[3]
        d.a[4] ^= bw[4]
        d.a[5] ^= bw[5]
        d.a[6] ^= bw[6]
        d.a[7] ^= bw[7]
        d.a[8] ^= bw[8]
    }
    if n >= 104 {
        d.a[9] ^= bw[9]
        d.a[10] ^= bw[10]
        d.a[11] ^= bw[11]
        d.a[12] ^= bw[12]
    }
    if n >= 136 {
        d.a[13] ^= bw[13]
        d.a[14] ^= bw[14]
        d.a[15] ^= bw[15]
        d.a[16] ^= bw[16]
    }
    if n >= 144 {
        d.a[17] ^= bw[17]
    }
    if n >= 168 {
        d.a[18] ^= bw[18]
        d.a[19] ^= bw[19]
        d.a[20] ^= bw[20]
    }
}

func copyOutUnaligned(d *state, buf []byte) {
    ab := (*[maxRate]uint8)(unsafe.Pointer(&d.a[0]))
    copy(buf, ab[:])
}

var (
    xorIn   = xorInUnaligned
    copyOut = copyOutUnaligned
)

const xorImplementationUnaligned = "unaligned"