各种加密解密函数（URL加密解密、sha1加密解密、des加密解密）

原文:各种加密解密函数（URL加密解密、sha1加密解密、des加密解密）

普通hash函数如md5、sha1、base64等都是不可逆函数。虽然我们利用php可以利用这些函数写出可逆函数来。但是跨语言时这类可逆函数非常难搞定。所以这时尽量使用AES DES RC4 Rabbit TripleDes这些方法。

包含超时的加密解密函数

 /**
     * 加密
     * @param string $string     要加密或解密的字符串
     * @param string $operation 加密 ''  解密 DECODE
     * @param string $key        密钥，加密解密时保持一致
     * @param int    $expiry 有效时长，单位：秒
     * @return string
     */
     function encrypt_code($string, $expiry = 0, $key = 'abc12345') {
     $ckey_length = 7;
     $key = md5($key ? $key : UC_KEY); //加密解密时这个是不变的
     $keya = md5(substr($key, 0, 16)); //加密解密时这个是不变的
     $keyb = md5(substr($key, 16, 16)); //加密解密时这个是不变的
     $keyc = $ckey_length ?  substr(md5(microtime()), -$ckey_length) : '';
     $cryptkey = $keya . md5($keya . $keyc); //64
     $key_length = strlen($cryptkey); //64  
 
     $string =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; $i <= 255; $i++) { //字母表 64位后重复 数列 范围为48~122
         $rndkey[$i] = ord($cryptkey[$i % $key_length]);
     }  
 
     for ($j = $i = 0; $i < 256; $i++) { //这里是一个打乱算法
         $j = ($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++) {
         $result .= chr(ord($string[$i]) ^ ($box[$i]));  
 
     }
      $str =  $keyc . str_replace('=', '', urlsafe_b64encode($result));
                 //  $str =htmlentities($str, ENT_QUOTES, "UTF-8"); // curl 访问出错
                   return $str ;
 }  
 
    /**
     * 解密
     * @param string $string     要加密或解密的字符串
     * @param string $operation 加密 ''  解密 DECODE
     * @param string $key        密钥，加密解密时保持一致
     * @param int    $expiry 有效时长，单位：秒
     * @return string
     */
      function encrypt_decode($string, $expiry = 0,$key = 'abc12345') {
                             //  $string = html_entity_decode($string, ENT_QUOTES, "UTF-8") ; //curl 访问出错
     $ckey_length = 7;
     $key = md5($key ? $key : UC_KEY); //加密解密时这个是不变的
     $keya = md5(substr($key, 0, 16)); //加密解密时这个是不变的
     $keyb = md5(substr($key, 16, 16)); //加密解密时这个是不变的  
 
     $keyc = $ckey_length ?  substr($string, 0, $ckey_length)   : '';  
 
     $cryptkey = $keya . md5($keya . $keyc); //64
     $key_length = strlen($cryptkey); //64
     $string = urlsafe_b64decode(substr($string, $ckey_length)) ;
                $string_length = strlen($string);
     $result = '';
     $box = range(0, 255);  
 
     $rndkey = array();
     for ($i = 0; $i <= 255; $i++) { //字母表 64位后重复 数列 范围为48~122
         $rndkey[$i] = ord($cryptkey[$i % $key_length]);
     }
     for ($j = $i = 0; $i < 256; $i++) { //这里是一个打乱算法
         $j = ($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++) {
         $result .= chr(ord($string[$i]) ^ ($box[$i]));
     }
           if ((substr($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 false;
                }  
 
 }  

最简单的往往是最好用的。

URL加密解密函数

     //加密函数
     function lock_url($txt,$key='www.zhuoyuexiazai.com'){
         $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='www.zhuoyuexiazai.com'){
         $txt = urldecode($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);
     }  

用户密码可逆加密解密函数：

     <?php
     function passport_encrypt($txt, $key = 'www.zhuoyuexiazai.com') {
         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 = 'www.zhuoyuexiazai.com') {
         $txt = passport_key(base64_decode(urldecode($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;
     }
     ?>  

测试方法：

     <?php
     $txt = "1";
     $key = "testkey";
     $encrypt = passport_encrypt($txt,$key);
     $decrypt = passport_decrypt($encrypt,$key);   
 
     echo $encrypt."<br>";
     echo $decrypt."<br>";
     ?>   

SHA1的可逆加密解密函数：

     <?php
     $string = "Helloworld";
     echo $str1 = dencrypt($string, true, "www.miaohr.com");
     echo $str2 = dencrypt($str1, false, "www.miaohr.com");  
 
     function dencrypt($string, $isEncrypt = true, $key = KEY_SPACE) {
     if (!isset($string{0}) || !isset($key{0})) {
     return false;
     }  
 
     $dynKey = $isEncrypt ? hash('sha1', microtime(true)) : substr($string, 0, 40);
     $fixedKey = hash('sha1', $key);  
 
     $dynKeyPart1 = substr($dynKey, 0, 20);
     $dynKeyPart2 = substr($dynKey, 20);
     $fixedKeyPart1 = substr($fixedKey, 0, 20);
     $fixedKeyPart2 = substr($fixedKey, 20);
     $key = hash('sha1', $dynKeyPart1 . $fixedKeyPart1 . $dynKeyPart2 . $fixedKeyPart2);  
 
     $string = $isEncrypt ? $fixedKeyPart1 . $string . $dynKeyPart2 : (isset($string{339}) ? gzuncompress(base64_decode(substr($string, 40))) : base64_decode(substr($string, 40)));  
 
     $n = 0;
     $result = '';
     $len = strlen($string);  
 
     for ($n = 0; $n < $len; $n++) {
     $result .= chr(ord($string{$n}) ^ ord($key{$n % 40}));
     }
     return $isEncrypt ? $dynKey . str_replace('=', '', base64_encode($n > 299 ? gzcompress($result) : $result)) : substr($result, 20, -20);
     }  
 
     ?>  

DES的加密解密函数：

     <?php  
 
     $input ='http://mlaan2.home.xs4all.nl/ispack/isetup-5.5.3.exe';
      /**
     *加密函数
     *$input 要被加密的字符串
     *$key 密钥
     */  
 
     $key = randomkeys(8);//生成随机密匙
     function do_mencrypt($input, $key)
     {
         $input = base64_encode(trim($input));
         //$key = substr(md5($key), 0, 4);
         $td = mcrypt_module_open('des', '', 'ecb', '');
         $iv = mcrypt_create_iv(mcrypt_enc_get_iv_size($td), MCRYPT_RAND);
         mcrypt_generic_init($td, $key, $iv);
         $encrypted_data = mcrypt_generic($td, $input);
         mcrypt_generic_deinit($td);
         mcrypt_module_close($td);
         return trim(base64_encode($encrypted_data));
     }
     print_r(do_mencrypt($input, $key));
     echo "<br/>";
     /**
     *解密函数
     *$input 要被解密的字符串
     *$key 密钥
     */
     $input1 = do_mencrypt($input, $key);
     function do_mdecrypt($input1, $key)
     {
         $input1 = base64_decode(trim($input1));
         $td = mcrypt_module_open('des', '', 'ecb', '');
         //$key = substr(md5($key), 0, 4);
         $iv = mcrypt_create_iv(mcrypt_enc_get_iv_size($td), MCRYPT_RAND);
         mcrypt_generic_init($td, $key, $iv);
         $decrypted_data = mdecrypt_generic($td, $input1);
         mcrypt_generic_deinit($td);
         mcrypt_module_close($td);
         return trim(base64_decode($decrypted_data));
     }
     print_r(do_mdecrypt($input1, $key));  
 
      #2.rand key: "CWSTOAYD"：生成随机密匙，统一用字母或者数字，长度为8.
     function randomkeys($length)
     {
        $pattern = '1234567890';
         for($i=0;$i<$length;$i++)
         {
             @$key .= $pattern{rand(0,9)};    //生成php随机数
         }
         return $key;
     }
     ?>  

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