Source file src/pkg/crypto/cipher/xor_amd64.go

     1	// Copyright 2018 The Go Authors. All rights reserved.
     2	// Use of this source code is governed by a BSD-style
     3	// license that can be found in the LICENSE file.
     4	
     5	package cipher
     6	
     7	// xorBytes xors the bytes in a and b. The destination should have enough
     8	// space, otherwise xorBytes will panic. Returns the number of bytes xor'd.
     9	func xorBytes(dst, a, b []byte) int {
    10		n := len(a)
    11		if len(b) < n {
    12			n = len(b)
    13		}
    14		if n == 0 {
    15			return 0
    16		}
    17		_ = dst[n-1]
    18		xorBytesSSE2(&dst[0], &a[0], &b[0], n) // amd64 must have SSE2
    19		return n
    20	}
    21	
    22	func xorWords(dst, a, b []byte) {
    23		xorBytes(dst, a, b)
    24	}
    25	
    26	//go:noescape
    27	func xorBytesSSE2(dst, a, b *byte, n int)
    28	

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