mcrypt 암호화 모듈

/**
 * encrypt, decrypt 관련 함수
 *
 * @author     Yongseok Kang <wyseburn(at)gmail.com>
 * @since       2011. 7. 13.
 * @category   
 * @version     1.0
 */

define('ENC_KEY', 'enckey!@#$'); //키 값

/**
 * hex2bin
 * @param string $hexdata
 */
function hex2bin($hexdata) {
    $bindata="";
    for ($i=0,$cnt=strlen($hexdata);$i<$cnt;$i+=2) {
        $bindata .= chr(hexdec(substr($hexdata,$i,2)));
    }
    return $bindata;
}
/**
 * 키를 통해 암호화
 * @param string $str
 */
function m_encrypt($str) {
    return bin2hex(gzcompress(mcrypt_ecb(MCRYPT_RIJNDAEL_192, md5(ENC_KEY), $str, MCRYPT_ENCRYPT)));
}
/**
 * 키를 통해 복호화
 * @param string $str
 */
function m_decrypt($str) {
    return trim(mcrypt_ecb(MCRYPT_RIJNDAEL_192, md5(ENC_KEY), gzuncompress(hex2bin($str)), MCRYPT_DECRYPT));
}