mcrypt.lib.php

一个用PHP编写的

<?php

/* $Id: mcrypt.lib.php,v 2.3 2005/02/07 16:46:02 rabus Exp $ */
// vim: expandtab sw=4 ts=4 sts=4:

/**
 * Initialization
 */

// Store the initialization vector because it will be needed for
// further decryption. I don't think necessary to have one iv
// per server so I don't put the server number in the cookie name.

if (!isset($_COOKIE['pma_mcrypt_iv'])) {
    srand((double) microtime() * 1000000);
    $iv = mcrypt_create_iv(mcrypt_get_iv_size(MCRYPT_BLOWFISH, MCRYPT_MODE_CBC), MCRYPT_RAND);
    setcookie('pma_mcrypt_iv',
        base64_encode($iv),
        time() + (60 * 60 * 24 * 30),
        $GLOBALS['cookie_path'], '',
        $GLOBALS['is_https']);
} else {
    $iv = base64_decode($_COOKIE['pma_mcrypt_iv']);
}

/**
 * String padding
 *
 * @param   string  input string
 * @param   integer length of the result
 * @param   string  the filling string
 * @param   integer padding mode
 *
 * @return  string  the padded string
 *
 * @access  public
 */
function full_str_pad($input, $pad_length, $pad_string = '', $pad_type = 0) {
    $str = '';
    $length = $pad_length - strlen($input);
    if ($length > 0) { // str_repeat doesn't like negatives
        if ($pad_type == STR_PAD_RIGHT) { // STR_PAD_RIGHT == 1
            $str = $input.str_repeat($pad_string, $length);
        } elseif ($pad_type == STR_PAD_BOTH) { // STR_PAD_BOTH == 2
            $str = str_repeat($pad_string, floor($length/2));
            $str .= $input;
            $str .= str_repeat($pad_string, ceil($length/2));
        } else { // defaults to STR_PAD_LEFT == 0
            $str = str_repeat($pad_string, $length).$input;
        }
    } else { // if $length is negative or zero we don't need to do anything
        $str = $input;
    }
    return $str;
}
/**
 * Encryption using blowfish algorithm (mcrypt)
 *
 * @param   string  original data
 * @param   string  the secret
 *
 * @return  string  the encrypted result
 *
 * @access  public
 *
 * @author  lem9
 */
function PMA_blowfish_encrypt($data, $secret) {
    global $iv;
    // Seems we don't need the padding. Anyway if we need it,
    // we would have to replace 8 by the next 8-byte boundary.
    //$data = full_str_pad($data, 8, "\0", STR_PAD_RIGHT);
    return base64_encode(mcrypt_encrypt(MCRYPT_BLOWFISH, $secret, $data, MCRYPT_MODE_CBC, $iv));
}

/**
 * Decryption using blowfish algorithm (mcrypt)
 *
 * @param   string  encrypted data
 * @param   string  the secret
 *
 * @return  string  original data
 *
 * @access  public
 *
 * @author  lem9
 */
function PMA_blowfish_decrypt($encdata, $secret) {
    global $iv;
    return trim(mcrypt_decrypt(MCRYPT_BLOWFISH, $secret, base64_decode($encdata), MCRYPT_MODE_CBC, $iv));
}

?>