public function encrypt($text, $key = null)
{
if (!function_exists("mcrypt_get_iv_size")) {
throw new Exception("mcrypt extension is required");
}
if ($key === null) {
$encryptKey = $this->key;
} else {
$encryptKey = $key;
}
if (empty($encryptKey)) {
throw new Exception("Encryption key cannot be empty");
}
$ivSize = mcrypt_get_iv_size($this->cipher, $this->mode);
if (strlen($encryptKey) > $ivSize) {
throw new Exception("Size of key is too large for this algorithm");
}
$iv = strval(mcrypt_create_iv($ivSize, MCRYPT_RAND));
$blockSize = intval(mcrypt_get_block_size($this->cipher, $this->mode));
if ($this->padding != 0 && ($this->mode == MCRYPT_MODE_CBC || $this->mode == MCRYPT_MODE_ECB)) {
$padded = $this->cryptPadText($text, $this->mode, $blockSize, $this->padding);
} else {
$padded = $text;
}
return $iv . mcrypt_encrypt($this->cipher, $encryptKey, $padded, $this->mode, $iv);
} /**
* Tests the padding
*
* @author Nikolaos Dimopoulos <*****@*****.**>
* @since 2014-10-17
*/
public function testCryptPadding()
{
$this->specify("padding not return correct results", function () {
$texts = [''];
$key = '0123456789ABCDEF0123456789ABCDEF';
$modes = [MCRYPT_MODE_ECB, MCRYPT_MODE_CBC, MCRYPT_MODE_CFB];
$pads = [Crypt::PADDING_ANSI_X_923, Crypt::PADDING_PKCS7];
for ($i = 1; $i < 128; ++$i) {
$texts[] = str_repeat('A', $i);
}
$crypt = new Crypt();
$crypt->setCipher(MCRYPT_RIJNDAEL_256)->setKey(substr($key, 0, 16));
foreach ($pads as $padding) {
$crypt->setPadding($padding);
foreach ($modes as $mode) {
$crypt->setMode($mode);
foreach ($texts as $text) {
$encrypted = $crypt->encrypt($text);
expect($crypt->decrypt($encrypted))->equals($text);
}
}
}
});
}
