PHP mcrypt加密解密

需要安裝php的mcrypt的擴展

class AMPCrypt {
    private static function getKey(){
        return md5('exampleKey');
    }

public static function encrypt($value){
     $td = mcrypt_module_open('tripledes', '', 'ecb', '');
     $iv = mcrypt_create_iv(mcrypt_enc_get_iv_size($td), MCRYPT_DEV_RANDOM);
     $key = substr(self::getKey(), 0, mcrypt_enc_get_key_size($td));
     mcrypt_generic_init($td, $key, $iv);
     $ret = base64_encode(mcrypt_generic($td, $value));
     mcrypt_generic_deinit($td);
     mcrypt_module_close($td);
     return $ret;
}

public static function dencrypt($value){
     $td = mcrypt_module_open('tripledes', '', 'ecb', '');
     $iv = mcrypt_create_iv(mcrypt_enc_get_iv_size($td), MCRYPT_DEV_RANDOM);
     $key = substr(self::getKey(), 0, mcrypt_enc_get_key_size($td));
     $key = substr(self::getKey(), 0, mcrypt_enc_get_key_size($td));
     mcrypt_generic_init($td, $key, $iv);
     $ret = trim(mdecrypt_generic($td, base64_decode($value))) ;
     mcrypt_generic_deinit($td);
     mcrypt_module_close($td);
    return $ret;
 }

} </pre>