lizhenqiu blog

Name: Commercial

===== LICENSE BEGIN =====
31157-D26597T
000017kWYG!tV2QVTV!fYKEYiETkfp
uYMMmhsTePgthVutczCX4PF0EoHAP7
JYFri32V7hdQkpwJJBgc!lK!o01BOQ
===== LICENSE END =====

Name: OpenSource

===== LICENSE BEGIN =====
95392-D27147T
00001mG6Lc9YBCATnMFu8EmPzMYqp7
NbTh7xIVABQpVozg0H7GxjSfBtt6f4
RO!bY4fBptyzOAfONsSc78LD!szjcN
===== LICENSE END =====

Name: Educational

===== LICENSE BEGIN =====
79489-D13780T
00000WevhuSZasfcIHRF8ne1li!gri
5pwr!"ttRDkYTk1IuWgsjyf7WJXLio
C47FZxcRcXFHn1XinQ"SldW1lUMr0q
===== LICENSE END =====

Name: Non Commercial

===== LICENSE BEGIN =====
84788-D22401T
00002ICm3tscFjOI!6D9N6"rlQzY"S
hKziDw7jv6nCn4pGY9DeKPt5k8yOVM
GbHMoZhfQ"TstQu!LkJmc7BEArnwAQ
===== LICENSE END =====

Name: Site

===== LICENSE BEGIN =====
79150-D76780T
00000MuB"Ak8tisq3UyV9q2w"kxGn2
WJRSxP4dyKklfPJLfPCByGsgU24kQu
ihxpp!!G4VP3XwmhmNbAWQc0xqkK3M
===== LICENSE END =====

Name: Personal

===== LICENSE BEGIN =====
48363-D36754T
00001Wv2qgaIOgpXEMGjgvtpxGz!M4
8QYCugxdmCGiWEHsqSfeSzyD4oNil!
oyK6rzpjhx"ykmcI4DUevGCVa!CXyx
===== LICENSE END =====

function authcode($string, $operation = 'DECODE', $key = '', $expiry = 0) {   
    // 动态密匙长度，相同的明文会生成不同密文就是依靠动态密匙   
    $ckey_length = 4;   
       
    // 密匙   
    $key = md5($key ? $key : $GLOBALS['discuz_auth_key']);   
       
    // 密匙a会参与加解密   
    $keya = md5(substr($key, 0, 16));   
    // 密匙b会用来做数据完整性验证   
    $keyb = md5(substr($key, 16, 16));   
    // 密匙c用于变化生成的密文   
    $keyc = $ckey_length ? ($operation == 'DECODE' ? substr($string, 0, $ckey_length): 
substr(md5(microtime()), -$ckey_length)) : '';   
    // 参与运算的密匙   
    $cryptkey = $keya.md5($keya.$keyc);   
    $key_length = strlen($cryptkey);   
    // 明文，前10位用来保存时间戳，解密时验证数据有效性，10到26位用来保存$keyb(密匙b)， 
//解密时会通过这个密匙验证数据完整性   
    // 如果是解码的话，会从第$ckey_length位开始，因为密文前$ckey_length位保存 动态密匙，以保证解密正确   
    $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);   
    $rndkey = array();   
    // 产生密匙簿   
    for($i = 0; $i <= 255; $i++) {   
        $rndkey[$i] = ord($cryptkey[$i % $key_length]);   
    }   
    // 用固定的算法，打乱密匙簿，增加随机性，好像很复杂，实际上对并不会增加密文的强度   
    for($j = $i = 0; $i < 256; $i++) {   
        $j = ($j + $box[$i] + $rndkey[$i]) % 256;   
        $tmp = $box[$i];   
        $box[$i] = $box[$j];   
        $box[$j] = $tmp;   
    }   
    // 核心加解密部分   
    for($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;   
        // 从密匙簿得出密匙进行异或，再转成字符   
        $result .= chr(ord($string[$i]) ^ ($box[($box[$a] + $box[$j]) % 256]));   
    }   
    if($operation == 'DECODE') {  
        // 验证数据有效性，请看未加密明文的格式   
        if((substr($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 {   
        // 把动态密匙保存在密文里，这也是为什么同样的明文，生产不同密文后能解密的原因   
        // 因为加密后的密文可能是一些特殊字符，复制过程可能会丢失，所以用base64编码   
        return $keyc.str_replace('=', '', base64_encode($result));   
    }   
}

function encrypt($string,$operation,$key=''){ 
    $key=md5($key); 
    $key_length=strlen($key); 
      $string=$operation=='D'?base64_decode($string):substr(md5($string.$key),0,8).$string; 
    $string_length=strlen($string); 
    $rndkey=$box=array(); 
    $result=''; 
    for($i=0;$i<=255;$i++){ 
           $rndkey[$i]=ord($key[$i%$key_length]); 
        $box[$i]=$i; 
    } 
    for($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($operation=='D'){ 
        if(substr($result,0,8)==substr(md5(substr($result,8).$key),0,8)){ 
            return substr($result,8); 
        }else{ 
            return''; 
        } 
    }else{ 
        return str_replace('=','',base64_encode($result)); 
    } 
}

function encrypt($data, $key)
{
	$key	=	md5($key);
    $x		=	0;
    $len	=	strlen($data);
    $l		=	strlen($key);
    for ($i = 0; $i < $len; $i++)
    {
        if ($x == $l) 
        {
        	$x = 0;
        }
        $char .= $key{$x};
        $x++;
    }
    for ($i = 0; $i < $len; $i++)
    {
        $str .= chr(ord($data{$i}) + (ord($char{$i})) % 256);
    }
    return base64_encode($str);
}

function decrypt($data, $key)
{
	$key = md5($key);
    $x = 0;
    $data = base64_decode($data);
    $len = strlen($data);
    $l = strlen($key);
    for ($i = 0; $i < $len; $i++)
    {
        if ($x == $l) 
        {
        	$x = 0;
        }
        $char .= substr($key, $x, 1);
        $x++;
    }
    for ($i = 0; $i < $len; $i++)
    {
        if (ord(substr($data, $i, 1)) < ord(substr($char, $i, 1)))
        {
            $str .= chr((ord(substr($data, $i, 1)) + 256) - ord(substr($char, $i, 1)));
        }
        else
        {
            $str .= chr(ord(substr($data, $i, 1)) - ord(substr($char, $i, 1)));
        }
    }
    return $str;
}