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<?php
namespace PayPal\Security;
/**
* Class Cipher
*
* Helper class to encrypt/decrypt data with secret key
*
* @package PayPal\Security
*/
class Cipher
{
private $secretKey;
/**
* Fixed IV Size
*/
const IV_SIZE = 16;
public function __construct($secretKey)
{
$this->secretKey = $secretKey;
}
/**
* Encrypts the input text using the cipher key
*
* @param $input
* @return string
*/
public function encrypt($input)
{
// Create a random IV. Not using mcrypt to generate one, as to not have a dependency on it.
$iv = substr(uniqid("", true), 0, Cipher::IV_SIZE);
// Encrypt the data
$encrypted = openssl_encrypt($input, "AES-256-CBC", $this->secretKey, 0, $iv);
// Encode the data with IV as prefix
return base64_encode($iv . $encrypted);
}
/**
* Decrypts the input text from the cipher key
*
* @param $input
* @return string
*/
public function decrypt($input)
{
// Decode the IV + data
$input = base64_decode($input);
// Remove the IV
$iv = substr($input, 0, Cipher::IV_SIZE);
// Return Decrypted Data
return openssl_decrypt(substr($input, Cipher::IV_SIZE), "AES-256-CBC", $this->secretKey, 0, $iv);
}
}