/**
* Decrypt
*
* @param string $data
* @throws Exception\InvalidArgumentException
* @return string
*/
public function decrypt($data)
{
if (empty($data)) {
throw new Exception\InvalidArgumentException('The data to decrypt cannot be empty');
}
if (null === $this->getKey()) {
throw new Exception\InvalidArgumentException('No key specified for the decryption');
}
if (null === $this->getPadding()) {
throw new Exception\InvalidArgumentException('You have to specify a padding method');
}
$iv = substr($data, 0, $this->getSaltSize());
$ciphertext = substr($data, $this->getSaltSize());
$result = mcrypt_decrypt($this->supportedAlgos[$this->algo], $this->getKey(), $ciphertext, $this->supportedModes[$this->mode], $iv);
// unpadding
return $this->padding->strip($result);
}
/**
* Decrypt
*
* @param string $data
* @throws Exception\InvalidArgumentException
* @return string
*/
public function decrypt($data)
{
if (empty($data)) {
throw new Exception\InvalidArgumentException('The data to decrypt cannot be empty');
}
if (null === $this->getKey()) {
throw new Exception\InvalidArgumentException('No decryption key specified');
}
if (null === $this->getPadding()) {
throw new Exception\InvalidArgumentException('You must specify a padding method');
}
$iv = mb_substr($data, 0, $this->getSaltSize(), '8bit');
$ciphertext = mb_substr($data, $this->getSaltSize(), null, '8bit');
$result = openssl_decrypt($ciphertext, strtoupper($this->encryptionAlgos[$this->algo] . '-' . $this->mode), $this->getKey(), OPENSSL_RAW_DATA | OPENSSL_ZERO_PADDING, $iv);
if (false === $result) {
$errMsg = '';
while ($msg = openssl_error_string()) {
$errMsg .= $msg;
}
throw new Exception\RuntimeException(sprintf('OpenSSL error: %s', $errMsg));
}
// unpadding
return $this->padding->strip($result);
}
