90 lines
2.5 KiB
PHP
90 lines
2.5 KiB
PHP
<?php
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/* $Id$ */
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// vim: expandtab sw=4 ts=4 sts=4:
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/**
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* Initialization
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*/
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// Store the initialization vector because it will be needed for
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// further decryption. I don't think necessary to have one iv
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// per server so I don't put the server number in the cookie name.
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if (!isset($_COOKIE['pma_mcrypt_iv'])) {
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srand((double) microtime() * 1000000);
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$iv = mcrypt_create_iv(mcrypt_get_iv_size(MCRYPT_BLOWFISH, MCRYPT_MODE_CBC), MCRYPT_RAND);
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PMA_setCookie('pma_mcrypt_iv', base64_encode($iv));
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} else {
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$iv = base64_decode($_COOKIE['pma_mcrypt_iv']);
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}
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/**
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* String padding
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*
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* @param string input string
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* @param integer length of the result
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* @param string the filling string
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* @param integer padding mode
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*
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* @return string the padded string
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*
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* @access public
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*/
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function full_str_pad($input, $pad_length, $pad_string = '', $pad_type = 0) {
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$str = '';
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$length = $pad_length - strlen($input);
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if ($length > 0) { // str_repeat doesn't like negatives
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if ($pad_type == STR_PAD_RIGHT) { // STR_PAD_RIGHT == 1
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$str = $input.str_repeat($pad_string, $length);
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} elseif ($pad_type == STR_PAD_BOTH) { // STR_PAD_BOTH == 2
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$str = str_repeat($pad_string, floor($length/2));
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$str .= $input;
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$str .= str_repeat($pad_string, ceil($length/2));
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} else { // defaults to STR_PAD_LEFT == 0
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$str = str_repeat($pad_string, $length).$input;
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}
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} else { // if $length is negative or zero we don't need to do anything
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$str = $input;
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}
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return $str;
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}
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/**
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* Encryption using blowfish algorithm (mcrypt)
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*
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* @param string original data
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* @param string the secret
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*
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* @return string the encrypted result
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*
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* @access public
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*
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* @author lem9
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*/
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function PMA_blowfish_encrypt($data, $secret) {
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global $iv;
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// Seems we don't need the padding. Anyway if we need it,
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// we would have to replace 8 by the next 8-byte boundary.
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//$data = full_str_pad($data, 8, "\0", STR_PAD_RIGHT);
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return base64_encode(mcrypt_encrypt(MCRYPT_BLOWFISH, $secret, $data, MCRYPT_MODE_CBC, $iv));
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}
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/**
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* Decryption using blowfish algorithm (mcrypt)
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*
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* @param string encrypted data
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* @param string the secret
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*
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* @return string original data
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*
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* @access public
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*
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* @author lem9
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*/
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function PMA_blowfish_decrypt($encdata, $secret) {
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global $iv;
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return trim(mcrypt_decrypt(MCRYPT_BLOWFISH, $secret, base64_decode($encdata), MCRYPT_MODE_CBC, $iv));
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}
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?>
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