1
2
3
4
5 package cipher_test
6
7 import (
8 "bytes"
9 "crypto/cipher"
10 "crypto/rand"
11 "fmt"
12 "io"
13 "testing"
14 )
15
16 func TestXOR(t *testing.T) {
17 for j := 1; j <= 1024; j++ {
18 if testing.Short() && j > 16 {
19 break
20 }
21 for alignP := 0; alignP < 2; alignP++ {
22 for alignQ := 0; alignQ < 2; alignQ++ {
23 for alignD := 0; alignD < 2; alignD++ {
24 p := make([]byte, j)[alignP:]
25 q := make([]byte, j)[alignQ:]
26 d1 := make([]byte, j+alignD)[alignD:]
27 d2 := make([]byte, j+alignD)[alignD:]
28 if _, err := io.ReadFull(rand.Reader, p); err != nil {
29 t.Fatal(err)
30 }
31 if _, err := io.ReadFull(rand.Reader, q); err != nil {
32 t.Fatal(err)
33 }
34 cipher.XorBytes(d1, p, q)
35 n := min(p, q)
36 for i := 0; i < n; i++ {
37 d2[i] = p[i] ^ q[i]
38 }
39 if !bytes.Equal(d1, d2) {
40 t.Logf("p: %#v", p)
41 t.Logf("q: %#v", q)
42 t.Logf("expect: %#v", d2)
43 t.Logf("result: %#v", d1)
44 t.Fatal("not equal")
45 }
46 }
47 }
48 }
49 }
50 }
51
52 func min(a, b []byte) int {
53 n := len(a)
54 if len(b) < n {
55 n = len(b)
56 }
57 return n
58 }
59
60 func BenchmarkXORBytes(b *testing.B) {
61 dst := make([]byte, 1<<15)
62 data0 := make([]byte, 1<<15)
63 data1 := make([]byte, 1<<15)
64 sizes := []int64{1 << 3, 1 << 7, 1 << 11, 1 << 15}
65 for _, size := range sizes {
66 b.Run(fmt.Sprintf("%dBytes", size), func(b *testing.B) {
67 s0 := data0[:size]
68 s1 := data1[:size]
69 b.SetBytes(int64(size))
70 for i := 0; i < b.N; i++ {
71 cipher.XorBytes(dst, s0, s1)
72 }
73 })
74 }
75 }
76
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