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// Copyright 2018 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.
package cipher
// xorBytes xors the bytes in a and b. The destination should have enough
// space, otherwise xorBytes will panic. Returns the number of bytes xor'd.
func xorBytes(dst, a, b []byte) int {
n := len(a)
if len(b) < n {
n = len(b)
if n == 0 {
return 0
_ = dst[n-1]
xorBytesSSE2(&dst[0], &a[0], &b[0], n) // amd64 must have SSE2
return n
func xorWords(dst, a, b []byte) {
xorBytes(dst, a, b)
func xorBytesSSE2(dst, a, b *byte, n int)