// new returns a fresh instance of the given cipher.
func (cipher CipherFunction) new(key []byte) (block cipher.Block) {
switch cipher {
case Cipher3DES:
block, _ = des.NewTripleDESCipher(key)
case CipherCAST5:
block, _ = cast5.NewCipher(key)
case CipherAES128, CipherAES192, CipherAES256:
block, _ = aes.NewCipher(key)
}
return
}
func (o ctrVerifier) validate(count string, key, iv, plaintext, expectedCiphertext []byte) {
block, err := cast5.NewCipher(key)
if err != nil {
panic(err)
}
ciphertext := make([]byte, len(plaintext))
stream := cipher.NewCTR(block, iv)
stream.XORKeyStream(ciphertext, plaintext)
if !bytes.Equal(ciphertext, expectedCiphertext) {
panic(fmt.Errorf("vector mismatch @ COUNT = %s:\n %s != %s\n",
count,
hex.EncodeToString(expectedCiphertext),
hex.EncodeToString(ciphertext)))
}
}
func (o cbcVerifier) validate(count string, key, iv, plaintext, expected_ciphertext []byte) {
block, err := cast5.NewCipher(key)
if err != nil {
panic(err)
}
ciphertext := make([]byte, len(plaintext))
mode := cipher.NewCBCEncrypter(block, iv)
mode.CryptBlocks(ciphertext, plaintext)
if !bytes.Equal(ciphertext, expected_ciphertext) {
panic(fmt.Errorf("vector mismatch @ COUNT = %s:\n %s != %s\n",
count,
hex.EncodeToString(expected_ciphertext),
hex.EncodeToString(ciphertext)))
}
}
func newCast5Stream(key, iv []byte, doe DecOrEnc) (cipher.Stream, error) {
block, err := cast5.NewCipher(key)
return newStream(block, err, key, iv, doe)
}
func newCast5Cipher(key []byte) (cipher.Block, error) {
return cast5.NewCipher(key)
}