1 files changed, 75 insertions, 0 deletions
diff --git a/src/crypto/cipher/xor_test.go b/src/crypto/cipher/xor_test.go
new file mode 100644
index 0000000..4f829e9
--- /dev/null
+++ b/src/crypto/cipher/xor_test.go
@@ -0,0 +1,75 @@
+// Copyright 2013 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_test
+
+import (
+	"bytes"
+	"crypto/cipher"
+	"crypto/rand"
+	"fmt"
+	"io"
+	"testing"
+)
+
+func TestXOR(t *testing.T) {
+	for j := 1; j <= 1024; j++ {
+		if testing.Short() && j > 16 {
+			break
+		}
+		for alignP := 0; alignP < 2; alignP++ {
+			for alignQ := 0; alignQ < 2; alignQ++ {
+				for alignD := 0; alignD < 2; alignD++ {
+					p := make([]byte, j)[alignP:]
+					q := make([]byte, j)[alignQ:]
+					d1 := make([]byte, j+alignD)[alignD:]
+					d2 := make([]byte, j+alignD)[alignD:]
+					if _, err := io.ReadFull(rand.Reader, p); err != nil {
+						t.Fatal(err)
+					}
+					if _, err := io.ReadFull(rand.Reader, q); err != nil {
+						t.Fatal(err)
+					}
+					cipher.XorBytes(d1, p, q)
+					n := min(p, q)
+					for i := 0; i < n; i++ {
+						d2[i] = p[i] ^ q[i]
+					}
+					if !bytes.Equal(d1, d2) {
+						t.Logf("p: %#v", p)
+						t.Logf("q: %#v", q)
+						t.Logf("expect: %#v", d2)
+						t.Logf("result: %#v", d1)
+						t.Fatal("not equal")
+					}
+				}
+			}
+		}
+	}
+}
+
+func min(a, b []byte) int {
+	n := len(a)
+	if len(b) < n {
+		n = len(b)
+	}
+	return n
+}
+
+func BenchmarkXORBytes(b *testing.B) {
+	dst := make([]byte, 1<<15)
+	data0 := make([]byte, 1<<15)
+	data1 := make([]byte, 1<<15)
+	sizes := []int64{1 << 3, 1 << 7, 1 << 11, 1 << 15}
+	for _, size := range sizes {
+		b.Run(fmt.Sprintf("%dBytes", size), func(b *testing.B) {
+			s0 := data0[:size]
+			s1 := data1[:size]
+			b.SetBytes(int64(size))
+			for i := 0; i < b.N; i++ {
+				cipher.XorBytes(dst, s0, s1)
+			}
+		})
+	}
+}