6种php加密解密方法

<?php  
function encryptDecrypt($key, $string, $decrypt){   
    if($decrypt){   
        $decrypted = rtrim(mcrypt_decrypt(MCRYPT_RIJNDAEL_256, md5($key), base64_decode($string), MCRYPT_MODE_CBC, md5(md5($key))), "12");   
        return $decrypted;   
    }else{   
        $encrypted = base64_encode(mcrypt_encrypt(MCRYPT_RIJNDAEL_256, md5($key), $string, MCRYPT_MODE_CBC, md5(md5($key))));   
        return $encrypted;   
    }   
}   

//加密:"z0JAx4qMwcF+db5TNbp/xwdUM84snRsXvvpXuaCa4Bk="  
echo encryptDecrypt('password', 'Helloweba欢迎您',0);   
//解密:"Helloweba欢迎您"  
echo encryptDecrypt('password', 'z0JAx4qMwcF+db5TNbp/xwdUM84snRsXvvpXuaCa4Bk=',1);  
?>  

<?php  
//加密函数  
function lock_url($txt,$key='liiu'){  
    $chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-=+";  
    $nh = rand(0,64);  
    $ch = $chars[$nh];  
    $mdKey = md5($key.$ch);  
    $mdKey = substr($mdKey,$nh%8, $nh%8+7);  
    $txt = base64_encode($txt);  
    $tmp = '';  
    $i=0;$j=0;$k = 0;  
    for ($i=0; $i<strlen($txt); $i++) {  
        $k = $k == strlen($mdKey) ? 0 : $k;  
        $j = ($nh+strpos($chars,$txt[$i])+ord($mdKey[$k++]))%64;  
        $tmp .= $chars[$j];  
    }  
    return urlencode($ch.$tmp);  
}  
//解密函数  
function unlock_url($txt,$key='liiu'){  
    $txt = urldecode($txt);  
    $chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-=+";  
    $ch = $txt[0];  
    $nh = strpos($chars,$ch);  
    $mdKey = md5($key.$ch);  
    $mdKey = substr($mdKey,$nh%8, $nh%8+7);  
    $txt = substr($txt,1);  
    $tmp = '';  
    $i=0;$j=0; $k = 0;  
    for ($i=0; $i<strlen($txt); $i++) {  
        $k = $k == strlen($mdKey) ? 0 : $k;  
        $j = strpos($chars,$txt[$i])-$nh - ord($mdKey[$k++]);  
        while ($j<0) $j+=64;  
        $tmp .= $chars[$j];  
    }  
    return base64_decode($tmp);  
}  
?>  

<?php  
//改进后的算法  
//加密函数  
function lock_url($txt,$key='str'){  
    $txt = $txt.$key;  
    $chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-=+";  
    $nh = rand(0,64);  
    $ch = $chars[$nh];  
    $mdKey = md5($key.$ch);  
    $mdKey = substr($mdKey,$nh%8, $nh%8+7);  
    $txt = base64_encode($txt);  
    $tmp = '';  
    $i=0;$j=0;$k = 0;  
    for ($i=0; $i<strlen($txt); $i++) {  
        $k = $k == strlen($mdKey) ? 0 : $k;  
        $j = ($nh+strpos($chars,$txt[$i])+ord($mdKey[$k++]))%64;  
        $tmp .= $chars[$j];  
    }  
    return urlencode(base64_encode($ch.$tmp));  
}  
//解密函数  
function unlock_url($txt,$key='str'){  
    $txt = base64_decode(urldecode($txt));  
    $chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-=+";  
    $ch = $txt[0];  
    $nh = strpos($chars,$ch);  
    $mdKey = md5($key.$ch);  
    $mdKey = substr($mdKey,$nh%8, $nh%8+7);  
    $txt = substr($txt,1);  
    $tmp = '';  
    $i=0;$j=0; $k = 0;  
    for ($i=0; $i<strlen($txt); $i++) {  
        $k = $k == strlen($mdKey) ? 0 : $k;  
        $j = strpos($chars,$txt[$i])-$nh - ord($mdKey[$k++]);  
        while ($j<0) $j+=64;  
        $tmp .= $chars[$j];  
    }  
    return trim(base64_decode($tmp),$key);  
}  

?> 

<?php  

function passport_encrypt($txt, $key = 'liiu') {   
    srand((double)microtime() * 1000000);   
    $encrypt_key = md5(rand(0, 32000));   
    $ctr = 0;   
    $tmp = '';   
    for($i = 0;$i < strlen($txt); $i++) {   
    $ctr = $ctr == strlen($encrypt_key) ? 0 : $ctr;   
    $tmp .= $encrypt_key[$ctr].($txt[$i] ^ $encrypt_key[$ctr++]);   
    }   
    return urlencode(base64_encode(passport_key($tmp, $key)));   
}   

function passport_decrypt($txt, $key = 'liiu') {   
    $txt = passport_key(base64_decode(urldecode($txt)), $key);   
    $tmp = '';   
    for($i = 0;$i < strlen($txt); $i++) {   
    $md5 = $txt[$i];   
    $tmp .= $txt[++$i] ^ $md5;   
    }   
    return $tmp;   
}   

function passport_key($txt, $encrypt_key) {   
    $encrypt_key = md5($encrypt_key);   
    $ctr = 0;   
    $tmp = '';   
    for($i = 0; $i < strlen($txt); $i++) {   
    $ctr = $ctr == strlen($encrypt_key) ? 0 : $ctr;   
    $tmp .= $txt[$i] ^ $encrypt_key[$ctr++];   
    }   
    return $tmp;   
}   


$txt = "1";   
$key = "testkey";   
$encrypt = passport_encrypt($txt,$key);   
$decrypt = passport_decrypt($encrypt,$key);   

echo $encrypt."<br>";   
echo $decrypt."<br>";   

?>   

<?php //非常给力的authcode加密函数,Discuz!经典代码(带详解) //函数authcode($string, $operation, $key, $expiry)中的$string：字符串，明文或密文；$operation：DECODE表示解密，其它表示加密；$key：密匙；$expiry：密文有效期。 function authcode($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)); } } $str = 'abcdef'; $key = 'www.helloweba.com'; echo authcode($str,'ENCODE',$key,0); //加密 $str = '56f4yER1DI2WTzWMqsfPpS9hwyoJnFP2MpC8SOhRrxO7BOk'; echo authcode($str,'DECODE',$key,0); //解密 ?> 

<?php //函数encrypt($string,$operation,$key)中$string：需要加密解密的字符串；$operation：判断是加密还是解密，E表示加密，D表示解密；$key：密匙。 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)); } } $str = 'abc'; $key = 'www.helloweba.com'; $token = encrypt($str, 'E', $key); echo '加密:'.encrypt($str, 'E', $key); echo '解密：'.encrypt($str, 'D', $key); ?>