这段代码不是挺复杂,其实如果你细看是可以看得到discuz中的authcode的影子的。如果你有兴趣,你可以看看:
/*加密函数内部调用函数*/ function keyED($txt,$encrypt_key) { $encrypt_key = md5($encrypt_key); $ctr=0; $tmp = ""; for ($i=0;$i<strlen($txt);$i++) { if ($ctr==strlen($encrypt_key)) $ctr=0; $tmp.= substr($txt,$i,1) ^ substr($encrypt_key,$ctr,1); $ctr++; } return $tmp; } /*发送邮件中连接地址的加密函数*/ function inner_DYEncrypt( $encryptstr ){ return urlencode(inner_DYEncrypt_subfun($encryptstr)); } function inner_DYEncrypt_subfun($encryptstr){ srand((double)microtime()*1000000); $encrypt_key = md5(rand(0,32000)); $ctr=0; $tmpstr = ""; for ($i=0;$i<strlen($encryptstr);$i++){ if ($ctr==strlen($encrypt_key)) $ctr=0; $tmpstr.= substr($encrypt_key,$ctr,1) . (substr($encryptstr,$i,1) ^ substr($encrypt_key,$ctr,1)); $ctr++; } $returninfo = base64_encode(keyED($tmpstr,ENCRYPTKEY)); if (strrpos($returninfo,"/") or strrpos($returninfo,'') or strrpos($returninfo,'+')) return inner_DYEncrypt_subfun( $encryptstr ); return $returninfo; } /*发送邮件中连接地址的解密函数*/ function inner_DYDecrypt( $decryptstr ){ $decryptstr = urldecode($decryptstr); $decryptstr = keyED(base64_decode($decryptstr),ENCRYPTKEY); $tmpstr = ""; for ($i=0;$i<strlen($decryptstr);$i++){ $md5 = substr($decryptstr,$i,1); $i++; $tmpstr.= (substr($decryptstr,$i,1) ^ $md5); } return $tmpstr; } /*演示*/ $key = "rdid=5135"; //待加密的字符串 echo "待加密的字符串:".$key.""; $key = inner_DYEncrypt($key); echo "加密后的字符串:".$key.""; echo "解密后的字符串:".inner_DYDecrypt($key); ?>
发完这个贴子的时候突然发现。我好久没有写博客了。倒不是不坚持,而是发现我实在没有什么东西好写了。一直吃老本,还能写什么?