六种php加密解密方法实例讲解

代码演示如下：

方法一

<?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);
?> 

方法二

<?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);
}
?>

方法三

<?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);
} 

?>

方法四

<?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>"; 

?> 

方法五

<?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 

?>

方法六

<?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); 

?>

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