libgo/go/crypto/cipher/cfb_test.go

   1 // Copyright 2010 The Go Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style
   3 // license that can be found in the LICENSE file.
   4
   5 package cipher_test
   6
   7 import (
   8         "bytes"
   9         "crypto/aes"
  10         "crypto/cipher"
  11         "crypto/rand"
  12         "testing"
  13 )
  14
  15 func TestCFB(t *testing.T) {
  16         block, err := aes.NewCipher(commonKey128)
  17         if err != nil {
  18                 t.Error(err)
  19                 return
  20         }
  21
  22         plaintext := []byte("this is the plaintext. this is the plaintext.")
  23         iv := make([]byte, block.BlockSize())
  24         rand.Reader.Read(iv)
  25         cfb := cipher.NewCFBEncrypter(block, iv)
  26         ciphertext := make([]byte, len(plaintext))
  27         copy(ciphertext, plaintext)
  28         cfb.XORKeyStream(ciphertext, ciphertext)
  29
  30         cfbdec := cipher.NewCFBDecrypter(block, iv)
  31         plaintextCopy := make([]byte, len(plaintext))
  32         copy(plaintextCopy, ciphertext)
  33         cfbdec.XORKeyStream(plaintextCopy, plaintextCopy)
  34
  35         if !bytes.Equal(plaintextCopy, plaintext) {
  36                 t.Errorf("got: %x, want: %x", plaintextCopy, plaintext)
  37         }
  38 }