php源码分析之DZX1.5加密解密函数authcode用法
这篇文章主要介绍了php源码分析之DZX1.5加密解密函数authcode用法,实例分析了DZX1.5中authcode函数加密与解密的使用技巧,需要的朋友可以参考下。
本文实例讲述了php源码分析之DZX1.5加密解密函数authcode用法,分享给大家供大家参考,具体分析如下:
- <?php
- $authkey = '';
- /**
- * @param string $string: 输入的需要加密(或解密)的明文(或密文)
- * @param string $operation: 'DECODE'或其它,其中默认表示解密,输入其它表示加密
- * @param string $key: 加解密密钥
- * @param int $expiry: 有效期
- */
- function authcode($string, $operation = 'DECODE', $key = '', $expiry = 0) {
- global $authkey;
- $ckey_length = 4;
- $key = md5($key != '' ? $key : $authkey);
- $keya = md5(substr($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));
- }
- }
- $str = '1234';
- $key = '1234';
- echo "明文:".$str;
- echo "<br />";
- echo "密钥:".$key;
- $encode = authcode($str,'11',$key);
- echo "<br />";
- echo "加密后的密文:".$encode;
- echo "<br />";
- $decode = authcode($encode,'DECODE',$key);
- echo "解密后的明文:".$decode;
- /*End of php*/
运行结果如下:
明文:1234
密钥:1234
加密后的密文:a52f67eXZGVy0HtQBo4vOREhq3WxnL6E2zlx75JGfoJW
解密后的明文:1234