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// 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/rand"
"encoding/hex"
"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)
}
}