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<?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));
}
?>
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