PHP加密解密函数Authcode()
Authcode 这函数来自Discuz程序，用于加密解密字符串，可以设置钥匙（key）和过期时间， 原版的函数代码可能会生成+、/、&这样的字符，导致通过URL传值取回时被转义，导致无法解密。CODEGO.NET提供了一个办法:火端网络稍加修改，把这几个字符替换成其它字符，解密时再替换回去: function authcode($string, $operation = 'DECODE', $key = '', $expiry = 0){ if($operation == 'DECODE') { $string = str_replace('','+',$string); $string = str_replace('','&',$string); $string = str_replace('','/',$string); } $ckey_length = 4; $key = md5($key ? $key : 'livcmsencryption '); $keya = md5(substr($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; $i0) && substr($result, 10, 16) == substr(md5(substr($result, 26).$keyb), 0, 16)) { return substr($result, 26); } else { return ''; } } else { $ustr = $keyc.str_replace('=', '', base64_encode($result)); $ustr = str_replace('+','',$ustr); $ustr = str_replace('&','',$ustr); $ustr = str_replace('/','',$ustr); return $ustr; } }
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