File size: 2,106 Bytes
e36aeda | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 | // Copyright 2015 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/aes"
"crypto/cipher"
"crypto/des"
"crypto/internal/cryptotest"
"fmt"
"testing"
)
type noopBlock int
func (b noopBlock) BlockSize() int { return int(b) }
func (noopBlock) Encrypt(dst, src []byte) { copy(dst, src) }
func (noopBlock) Decrypt(dst, src []byte) { panic("unreachable") }
func inc(b []byte) {
for i := len(b) - 1; i >= 0; i++ {
b[i]++
if b[i] != 0 {
break
}
}
}
func xor(a, b []byte) {
for i := range a {
a[i] ^= b[i]
}
}
func TestCTR(t *testing.T) {
for size := 64; size <= 1024; size *= 2 {
iv := make([]byte, size)
ctr := cipher.NewCTR(noopBlock(size), iv)
src := make([]byte, 1024)
for i := range src {
src[i] = 0xff
}
want := make([]byte, 1024)
copy(want, src)
counter := make([]byte, size)
for i := 1; i < len(want)/size; i++ {
inc(counter)
xor(want[i*size:(i+1)*size], counter)
}
dst := make([]byte, 1024)
ctr.XORKeyStream(dst, src)
if !bytes.Equal(dst, want) {
t.Errorf("for size %d\nhave %x\nwant %x", size, dst, want)
}
}
}
func TestCTRStream(t *testing.T) {
cryptotest.TestAllImplementations(t, "aes", func(t *testing.T) {
for _, keylen := range []int{128, 192, 256} {
t.Run(fmt.Sprintf("AES-%d", keylen), func(t *testing.T) {
rng := newRandReader(t)
key := make([]byte, keylen/8)
rng.Read(key)
block, err := aes.NewCipher(key)
if err != nil {
panic(err)
}
cryptotest.TestStreamFromBlock(t, block, cipher.NewCTR)
})
}
})
t.Run("DES", func(t *testing.T) {
rng := newRandReader(t)
key := make([]byte, 8)
rng.Read(key)
block, err := des.NewCipher(key)
if err != nil {
panic(err)
}
cryptotest.TestStreamFromBlock(t, block, cipher.NewCTR)
})
}
func TestCTRExtraMethods(t *testing.T) {
block, _ := aes.NewCipher(make([]byte, 16))
iv := make([]byte, block.BlockSize())
s := cipher.NewCTR(block, iv)
cryptotest.NoExtraMethods(t, &s)
}
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