| // Copyright 2022 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 subtle |
| |
| // XORBytes sets dst[i] = x[i] ^ y[i] for all i < n = min(len(x), len(y)), |
| // returning n, the number of bytes written to dst. |
| // If dst does not have length at least n, |
| // XORBytes panics without writing anything to dst. |
| func XORBytes(dst, x, y []byte) int { |
| n := len(x) |
| if len(y) < n { |
| n = len(y) |
| } |
| if n == 0 { |
| return 0 |
| } |
| if n > len(dst) { |
| panic("subtle.XORBytes: dst too short") |
| } |
| xorBytes(&dst[0], &x[0], &y[0], n) // arch-specific |
| return n |
| } |
