PHP 加密/解密函数 dencrypt(动态密文，带压缩功能，支持中文)

<div class="codetitle"><a style="CURSOR: pointer" data="20940" class="copybut" id="copybut20940" onclick="doCopy('code20940')"> 代码如下:<div class="codebody" id="code20940">
// +----------------------------------------------------------------------+
// | 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
// $key 密匙
// 采用SHA1生成密匙簿，超过300个字符使用ZLIB压缩
function dencrypt($string,$isEncrypt = true,$key = KEY_SPACE) {
if (!isset($string{0}) || !isset($key{0})) {
return false;
} $dynKey = $isEncrypt ? hash('sha1',microtime(true)) : substr($string,40);
$fixedKey = hash('sha1',$key); $dynKeyPart1 = substr($dynKey,20);
$dynKeyPart2 = substr($dynKey,20);
$fixedKeyPart1 = substr($fixedKey,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);
}

（编辑：李大同）

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