Мы используем mcrypt в наших проектах для достижения шифрования. Ниже приведен пример кода на основе содержимого, найденного в Интернете:
<?php
class MyProjCrypt {
private $td;
private $iv;
private $ks;
private $salt;
private $encStr;
private $decStr;
/**
* The constructor initializes the cryptography library
* @param $salt string The encryption key
* @return void
*/
function __construct($salt) {
$this->td = mcrypt_module_open('rijndael-256', '', 'ofb', ''); // algorithm
$this->ks = mcrypt_enc_get_key_size($this->td); // key size needed for the algorithm
$this->salt = substr(md5($salt), 0, $this->ks);
}
/**
* Generates a hex string of $src
* @param $src string String to be encrypted
* @return void
*/
function encrypt($src) {
srand(( double) microtime() * 1000000); //for sake of MCRYPT_RAND
$this->iv = mcrypt_create_iv($this->ks, MCRYPT_RAND);
mcrypt_generic_init($this->td, $this->salt, $this->iv);
$tmpStr = mcrypt_generic($this->td, $src);
mcrypt_generic_deinit($this->td);
mcrypt_module_close($this->td);
//convert the encrypted binary string to hex
//$this->iv is needed to decrypt the string later. It has a fixed length and can easily
//be seperated out from the encrypted String
$this->encStr = bin2hex($this->iv.$tmpStr);
}
/**
* Decrypts a hex string
* @param $src string String to be decrypted
* @return void
*/
function decrypt($src) {
//convert the hex string to binary
$corrected = preg_replace("[^0-9a-fA-F]", "", $src);
$binenc = pack("H".strlen($corrected), $corrected);
//retrieve the iv from the encrypted string
$this->iv = substr($binenc, 0, $this->ks);
//retrieve the encrypted string alone(minus iv)
$binstr = substr($binenc, $this->ks);
/* Initialize encryption module for decryption */
mcrypt_generic_init($this->td, $this->salt, $this->iv);
/* Decrypt encrypted string */
$decrypted = mdecrypt_generic($this->td, $binstr);
/* Terminate decryption handle and close module */
mcrypt_generic_deinit($this->td);
mcrypt_module_close($this->td);
$this->decStr = trim($decrypted);
}
}