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<?php
/**
* Helper library for CryptoJS AES encryption/decryption
* Allow you to use AES encryption on client side and server side vice versa
*
* @author BrainFooLong (bfldev.com)
* @link https://github.com/brainfoolong/cryptojs-aes-php
*/
/**
* Decrypt data from a CryptoJS json encoding string
*
* @param mixed $passphrase
* @param mixed $jsonString
* @return mixed
*/
if(!function_exists('cryptoJsAesDecrypt')) {
function cryptoJsAesDecrypt($jsonString)
{
$passphrase = cryptoJSPW();
$jsondata = json_decode($jsonString, true);
try {
$salt = hex2bin($jsondata["s"]);
$iv = hex2bin($jsondata["iv"]);
} catch (Exception $e) {
return null;
}
$ct = base64_decode($jsondata["ct"]);
$concatedPassphrase = $passphrase . $salt;
$md5 = array();
$md5[0] = md5($concatedPassphrase, true);
$result = $md5[0];
for ($i = 1; $i < 3; $i++) {
$md5[$i] = md5($md5[$i - 1] . $concatedPassphrase, true);
$result .= $md5[$i];
}
$key = substr($result, 0, 32);
// return ($iv);
$data = openssl_decrypt($ct, 'aes-256-cbc', $key, true, $iv);
return json_decode($data, true);
}
}
/**
* Encrypt value to a cryptojs compatiable json encoding string
*
* @param mixed $passphrase
* @param mixed $value
* @return string
*/
if(!function_exists('cryptoJsAesEncrypt')) {
function cryptoJsAesEncrypt($value)
{
$passphrase = cryptoJSPW();
$salt = openssl_random_pseudo_bytes(8);
$salted = '';
$dx = '';
while (strlen($salted) < 48) {
$dx = md5($dx . $passphrase . $salt, true);
$salted .= $dx;
}
$key = substr($salted, 0, 32);
$iv = substr($salted, 32, 16);
$encrypted_data = openssl_encrypt(json_encode($value), 'aes-256-cbc', $key, true, $iv);
$data = array("ct" => base64_encode($encrypted_data), "iv" => bin2hex($iv), "s" => bin2hex($salt));
return json_encode($data);
}
}
if(!function_exists('cryptoJSPW')){
function cryptoJSPW(){
return 'aGm9Ss20rCZHnnnpZzoX6zWL246jkHHt4Vi9if4qWHiaqo6oqZJrdYyKZDMmxGM4';
}
}
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