public static function decrypt($string, $key = null, $salt = null, $iv = null)
{
$config = ConfigManager::getConfig('Crypto', 'AES256')->AuxConfig;
if ($key === null) {
$key = $config->key;
}
if ($salt === null) {
$salt = $config->salt;
}
if ($iv === null) {
$iv = $config->iv;
}
$td = mcrypt_module_open('rijndael-128', '', MCRYPT_MODE_CBC, '');
$ks = mcrypt_enc_get_key_size($td);
$bs = mcrypt_enc_get_block_size($td);
$iv = substr(hash("sha256", $iv), 0, $bs);
// Create key
$key = Crypto::pbkdf2("sha512", $key, $salt, $config->pbkdfRounds, $ks);
// Initialize encryption module for decryption
mcrypt_generic_init($td, $key, $iv);
$decryptedString = "";
// Decrypt encrypted string
try {
if (ctype_xdigit($string)) {
$decryptedString = trim(mdecrypt_generic($td, pack("H*", $string)));
}
} catch (ErrorException $e) {
}
// Terminate decryption handle and close module
mcrypt_generic_deinit($td);
mcrypt_module_close($td);
// Show string
return $decryptedString;
}
/**
* Get user passwowrd hash using plain password and salt
*
* @param string $password
* @param string $salt
*/
public static function getUserPasswordHash($password, $salt)
{
$config = ConfigManager::getConfig("Users", "Users")->AuxConfig;
return Crypto::byte2hex(Crypto::pbkdf2("SHA512", $password, $config->siteSalt . $salt, $config->pbdkf2IterationCount, 64));
}
