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// 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 subtle_test
import (
"bytes"
"crypto/rand"
. "crypto/subtle"
"fmt"
"io"
"testing"
)
func TestXORBytes(t *testing.T) {
for n := 1; n <= 1024; n++ {
if n > 16 && testing.Short() {
n += n >> 3
}
for alignP := 0; alignP < 8; alignP++ {
for alignQ := 0; alignQ < 8; alignQ++ {
for alignD := 0; alignD < 8; alignD++ {
p := make([]byte, alignP+n, alignP+n+10)[alignP:]
q := make([]byte, alignQ+n, alignQ+n+10)[alignQ:]
if n&1 != 0 {
p = p[:n]
} else {
q = q[:n]
}
if _, err := io.ReadFull(rand.Reader, p); err != nil {
t.Fatal(err)
}
if _, err := io.ReadFull(rand.Reader, q); err != nil {
t.Fatal(err)
}
d := make([]byte, alignD+n, alignD+n+10)
for i := range d {
d[i] = 0xdd
}
want := make([]byte, len(d), cap(d))
copy(want[:cap(want)], d[:cap(d)])
for i := 0; i < n; i++ {
want[alignD+i] = p[i] ^ q[i]
}
if XORBytes(d[alignD:], p, q); !bytes.Equal(d, want) {
t.Fatalf("n=%d alignP=%d alignQ=%d alignD=%d:\n\tp = %x\n\tq = %x\n\td = %x\n\twant %x\n", n, alignP, alignQ, alignD, p, q, d, want)
}
}
}
}
}
}
func TestXorBytesPanic(t *testing.T) {
mustPanic(t, "subtle.XORBytes: dst too short", func() {
XORBytes(nil, make([]byte, 1), make([]byte, 1))
})
mustPanic(t, "subtle.XORBytes: dst too short", func() {
XORBytes(make([]byte, 1), make([]byte, 2), make([]byte, 3))
})
}
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++ {
XORBytes(dst, s0, s1)
}
})
}
}
func mustPanic(t *testing.T, expected string, f func()) {
t.Helper()
defer func() {
switch msg := recover().(type) {
case nil:
t.Errorf("expected panic(%q), but did not panic", expected)
case string:
if msg != expected {
t.Errorf("expected panic(%q), but got panic(%q)", expected, msg)
}
default:
t.Errorf("expected panic(%q), but got panic(%T%v)", expected, msg, msg)
}
}()
f()
}
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