Adding upstream version 1.21.8.upstream/1.21.8

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 24 insertions, 0 deletions

diff --git a/src/crypto/subtle/xor.go b/src/crypto/subtle/xor.go
new file mode 100644
index 0000000..a8805ac
--- /dev/null
+++ b/src/crypto/subtle/xor.go
@@ -0,0 +1,24 @@
+// 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
+}