浏览 UCenter 源代码的时候发现这个函数, 刚好有需要, 就记录一下
代码如下:
- function authcode($string, $operation = 'DECODE', $key = '', $expiry = 0) {
- $ckey_length = 4; // 随机密钥长度 取值 0-32;
- // 加入随机密钥, 可以令密文无任何规律, 即便是原文和密钥完全相同, 加密结果也会每次不同, 增大破解难度
- // 取值越大, 密文变动规律越大, 密文变化 = 16 的 $ckey_length 次方
- // 当此值为 0 时, 则不产生随机密钥
- $key = md5($key ? $key: UC_KEY);
- $keya = md5(substr($key, 0, 16));
- $keyb = md5(substr($key, 16, 16));
- $keyc = $ckey_length ? ($operation == 'DECODE' ? substr($string, 0, $ckey_length) : substr(md5(microtime()), -$ckey_length)) : '';
- $cryptkey = $keya.md5($keya.$keyc);
- $key_length = strlen($cryptkey);
- $string = $operation == 'DECODE' ? base64_decode(substr($string, $ckey_length)) : sprintf('%010d', $expiry ? $expiry + time() : 0).substr(md5($string.$keyb), 0, 16).$string;
- $string_length = strlen($string);
- $result = '';
- $box = range(0, 255);
- $rndkey = array();
- for ($i = 0; $i <= 255; $i++) {
- $rndkey[$i] = ord($cryptkey[$i % $key_length]);
- }
- for ($j = $i = 0; $i < 256; $i++) {
- $j = ($j + $box[$i] + $rndkey[$i]) % 256;
- $tmp = $box[$i];
- $box[$i] = $box[$j];
- $box[$j] = $tmp;
- }
- for ($a = $j = $i = 0; $i < $string_length; $i++) {
- $a = ($a + 1) % 256;
- $j = ($j + $box[$a]) % 256;
- $tmp = $box[$a];
- $box[$a] = $box[$j];
- $box[$j] = $tmp;
- $result. = chr(ord($string[$i]) ^ ($box[($box[$a] + $box[$j]) % 256]));
- }
- if ($operation == 'DECODE') {
- if ((substr($result, 0, 10) == 0 || substr($result, 0, 10) - time() > 0) && substr($result, 10, 16) == substr(md5(substr($result, 26).$keyb), 0, 16)) {
- return substr($result, 26);
- } else {
- return '';
- }
- } else {
- return $keyc.str_replace('=', '', base64_encode($result));
- }
- }
- /***************************************************************************/
- $string = authcode("Hello", "ENCODE", "html_TCCJ_AUTH");
- echo $string,
- '
- ';
- echo authcode($string, "DECODE", "HTML_TCCJ_AUTH"),
- '
- ';
来源: https://www.php1.cn/detail/php-857c139db4.html