|
|
// +----------------------------------------------------------------------+
// | Willko Framework |
// +----------------------------------------------------------------------+
// | Copyright (c) 2008-2009 Willko Cheng |
// +----------------------------------------------------------------------+
// | Authors: Willko Cheng <willko@foxmail.com> |
// +----------------------------------------------------------------------+
// $string 明文 或 密文
// $isEncrypt 是否加密
// $key 密匙
// 采用SHA1生成密匙簿，超過(guò)300個(gè)字符使用ZLIB壓縮
function dencrypt($string, $isEncrypt = true, $key = KEY_SPACE) {
if (!isset($string{0}) || !isset($key{0})) {
return false;
}
$dynKey = $isEncrypt ? hash('sha1', microtime(true)) : substr($string, 0, 40);
$fixedKey = hash('sha1', $key);
$dynKeyPart1 = substr($dynKey, 0, 20);
$dynKeyPart2 = substr($dynKey, 20);
$fixedKeyPart1 = substr($fixedKey, 0, 20);
$fixedKeyPart2 = substr($fixedKey, 20);
$key = hash('sha1', $dynKeyPart1 . $fixedKeyPart1 . $dynKeyPart2 . $fixedKeyPart2);
$string = $isEncrypt ? $fixedKeyPart1 . $string . $dynKeyPart2 : (isset($string{339}) ? gzuncompress(base64_decode(substr($string, 40))) : base64_decode(substr($string, 40)));
$n = 0;
$result = '';
$len = strlen($string);
for ($n = 0; $n < $len; $n++) {
$result .= chr(ord($string{$n}) ^ ord($key{$n % 40}));
}
return $isEncrypt ? $dynKey . str_replace('=', '', base64_encode($n > 299 ? gzcompress($result) : $result)) : substr($result, 20, -20);
}
php技術(shù)：PHP 加密/解密函數(shù) dencrypt(動(dòng)態(tài)密文，帶壓縮功能，支持中文)，轉(zhuǎn)載需保留來(lái)源！
鄭重聲明：本文版權(quán)歸原作者所有，轉(zhuǎn)載文章僅為傳播更多信息之目的，如作者信息標(biāo)記有誤，請(qǐng)第一時(shí)間聯(lián)系我們修改或刪除，多謝。
