File size: 3,846 Bytes
4bcc2be | 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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 | // Copyright 2010 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"
"crypto/rand"
"encoding/hex"
"fmt"
"testing"
)
// cfbTests contains the test vectors from
// https://csrc.nist.gov/publications/nistpubs/800-38a/sp800-38a.pdf, section
// F.3.13.
var cfbTests = []struct {
key, iv, plaintext, ciphertext string
}{
{
"2b7e151628aed2a6abf7158809cf4f3c",
"000102030405060708090a0b0c0d0e0f",
"6bc1bee22e409f96e93d7e117393172a",
"3b3fd92eb72dad20333449f8e83cfb4a",
},
{
"2b7e151628aed2a6abf7158809cf4f3c",
"3B3FD92EB72DAD20333449F8E83CFB4A",
"ae2d8a571e03ac9c9eb76fac45af8e51",
"c8a64537a0b3a93fcde3cdad9f1ce58b",
},
{
"2b7e151628aed2a6abf7158809cf4f3c",
"C8A64537A0B3A93FCDE3CDAD9F1CE58B",
"30c81c46a35ce411e5fbc1191a0a52ef",
"26751f67a3cbb140b1808cf187a4f4df",
},
{
"2b7e151628aed2a6abf7158809cf4f3c",
"26751F67A3CBB140B1808CF187A4F4DF",
"f69f2445df4f9b17ad2b417be66c3710",
"c04b05357c5d1c0eeac4c66f9ff7f2e6",
},
}
func TestCFBVectors(t *testing.T) {
for i, test := range cfbTests {
key, err := hex.DecodeString(test.key)
if err != nil {
t.Fatal(err)
}
iv, err := hex.DecodeString(test.iv)
if err != nil {
t.Fatal(err)
}
plaintext, err := hex.DecodeString(test.plaintext)
if err != nil {
t.Fatal(err)
}
expected, err := hex.DecodeString(test.ciphertext)
if err != nil {
t.Fatal(err)
}
block, err := aes.NewCipher(key)
if err != nil {
t.Fatal(err)
}
ciphertext := make([]byte, len(plaintext))
cfb := cipher.NewCFBEncrypter(block, iv)
cfb.XORKeyStream(ciphertext, plaintext)
if !bytes.Equal(ciphertext, expected) {
t.Errorf("#%d: wrong output: got %x, expected %x", i, ciphertext, expected)
}
cfbdec := cipher.NewCFBDecrypter(block, iv)
plaintextCopy := make([]byte, len(ciphertext))
cfbdec.XORKeyStream(plaintextCopy, ciphertext)
if !bytes.Equal(plaintextCopy, plaintext) {
t.Errorf("#%d: wrong plaintext: got %x, expected %x", i, plaintextCopy, plaintext)
}
}
}
func TestCFBInverse(t *testing.T) {
block, err := aes.NewCipher(commonKey128)
if err != nil {
t.Error(err)
return
}
plaintext := []byte("this is the plaintext. this is the plaintext.")
iv := make([]byte, block.BlockSize())
rand.Reader.Read(iv)
cfb := cipher.NewCFBEncrypter(block, iv)
ciphertext := make([]byte, len(plaintext))
copy(ciphertext, plaintext)
cfb.XORKeyStream(ciphertext, ciphertext)
cfbdec := cipher.NewCFBDecrypter(block, iv)
plaintextCopy := make([]byte, len(plaintext))
copy(plaintextCopy, ciphertext)
cfbdec.XORKeyStream(plaintextCopy, plaintextCopy)
if !bytes.Equal(plaintextCopy, plaintext) {
t.Errorf("got: %x, want: %x", plaintextCopy, plaintext)
}
}
func TestCFBStream(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)
}
t.Run("Encrypter", func(t *testing.T) {
cryptotest.TestStreamFromBlock(t, block, cipher.NewCFBEncrypter)
})
t.Run("Decrypter", func(t *testing.T) {
cryptotest.TestStreamFromBlock(t, block, cipher.NewCFBDecrypter)
})
})
}
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)
}
t.Run("Encrypter", func(t *testing.T) {
cryptotest.TestStreamFromBlock(t, block, cipher.NewCFBEncrypter)
})
t.Run("Decrypter", func(t *testing.T) {
cryptotest.TestStreamFromBlock(t, block, cipher.NewCFBDecrypter)
})
})
}
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