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AES Encryption with PKCS7 padding in PHP
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<?php | |
/** | |
* AES Encryption with PKCS7 padding http://en.wikipedia.org/wiki/Padding_(cryptography)#PKCS7 | |
* https://gist.github.com/RiANOl/1077723 | |
* http://php.net/manual/en/function.mcrypt-encrypt.php | |
* http://stackoverflow.com/questions/7448763/proper-php-mcrypt-encryption-methods | |
* | |
* User: martinhalamicek | |
* Date: 7/8/13 | |
* Time: 3:06 PM | |
*/ | |
namespace Keboola\Encryption; | |
class AES128Encryptor implements EncryptorInterface | |
{ | |
private $_cipher = MCRYPT_RIJNDAEL_128; | |
private $_mode = MCRYPT_MODE_CBC; | |
private $_key; | |
private $_initializationVectorSize; | |
public function __construct($key) | |
{ | |
$this->_key = $key; | |
$this->_initializationVectorSize = mcrypt_get_iv_size($this->_cipher, $this->_mode); | |
if (strlen($key) > ($keyMaxLength = mcrypt_get_key_size($this->_cipher, $this->_mode))) { | |
throw new \InvalidArgumentException("The key length must be less or equal than $keyMaxLength."); | |
} | |
} | |
public function encrypt($data) | |
{ | |
$blockSize = mcrypt_get_block_size($this->_cipher, $this->_mode); | |
$pad = $blockSize - (strlen($data) % $blockSize); | |
$iv = mcrypt_create_iv($this->_initializationVectorSize, MCRYPT_DEV_URANDOM); | |
return $iv . mcrypt_encrypt( | |
$this->_cipher, | |
$this->_key, | |
$data . str_repeat(chr($pad), $pad), | |
$this->_mode, | |
$iv | |
); | |
} | |
public function decrypt($encryptedData) | |
{ | |
$initializationVector = substr($encryptedData, 0, $this->_initializationVectorSize); | |
$data = mcrypt_decrypt( | |
$this->_cipher, | |
$this->_key, | |
substr($encryptedData, $this->_initializationVectorSize), | |
$this->_mode, | |
$initializationVector | |
); | |
$pad = ord($data[strlen($data) - 1]); | |
return substr($data, 0, -$pad); | |
} | |
} |
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