php-------代码加密的几种方法

代码加密，也是保护网站安全的一种方法，以下我们来介绍一下如何通过PHP的自定义函数来加密我们的PHP代码。

方法一：

<?php
 function encode_file_contents($filename) {
     $type=strtolower(substr(strrchr($filename,'.'),1));
     if ('php' == $type && is_file($filename) && is_writable($filename)) { // 如果是PHP文件 并且可写 则进行压缩编码
         $contents = file_get_contents($filename); // 判断文件是否已经被编码处理
         $contents = php_strip_whitespace($filename);   

         // 去除PHP头部和尾部标识
         $headerPos = strpos($contents,'<?php');
         $footerPos = strrpos($contents,'?>');
         $contents = substr($contents, $headerPos + 5, $footerPos - $headerPos);
         $encode = base64_encode(gzdeflate($contents)); // 开始编码
         $encode = '<?php'."\n eval(gzinflate(base64_decode("."'".$encode."'".")));\n\n?>";   

         return file_put_contents($filename, $encode);
     }
     return false;
 }   

 //调用函数
 $filename = 'dam.php';
 encode_file_contents($filename);
 echo "OK,加密完成！"
 ?>

加密方法二：

<?php  

 function RandAbc($length = "") { // 返回随机字符串
     $str = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
     return str_shuffle($str);
 }   

 $filename = 'index.php'; //要加密的文件
 $T_k1 = RandAbc(); //随机密匙1
 $T_k2 = RandAbc(); //随机密匙2
 $vstr = file_get_contents($filename);
 $v1 = base64_encode($vstr);
 $c = strtr($v1, $T_k1, $T_k2); //根据密匙替换对应字符。
 $c = $T_k1.$T_k2.$c;
 $q1 = "O00O0O";
 $q2 = "O0O000";
 $q3 = "O0OO00";
 $q4 = "OO0O00";
 $q5 = "OO0000";
 $q6 = "O00OO0";
 $s = '$'.$q6.'=urldecode("%6E1%7A%62%2F%6D%615%5C%76%740%6928%2D%70%78%75%71%79%2A6%6C%72%6B%64%679%5F%65%68%63%73%77%6F4%2B%6637%6A");$'.$q1.'=$'.$q6.'{3}.$'.$q6.'{6}.$'.$q6.'{33}.$'.$q6.'{30};$'.$q3.'=$'.$q6.'{33}.$'.$q6.'{10}.$'.$q6.'{24}.$'.$q6.'{10}.$'.$q6.'{24};$'.$q4.'=$'.$q3.'{0}.$'.$q6.'{18}.$'.$q6.'{3}.$'.$q3.'{0}.$'.$q3.'{1}.$'.$q6.'{24};$'.$q5.'=$'.$q6.'{7}.$'.$q6.'{13};$'.$q1.'.=$'.$q6.'{22}.$'.$q6.'{36}.$'.$q6.'{29}.$'.$q6.'{26}.$'.$q6.'{30}.$'.$q6.'{32}.$'.$q6.'{35}.$'.$q6.'{26}.$'.$q6.'{30};eval($'.$q1.'("'.base64_encode('$'.$q2.'="'.$c.'";eval(\'?>\'.$'.$q1.'($'.$q3.'($'.$q4.'($'.$q2.',$'.$q5.'*2),$'.$q4.'($'.$q2.',$'.$q5.',$'.$q5.'),$'.$q4.'($'.$q2.',0,$'.$q5.'))));').'"));';  

 $s = '<?php '."\n".$s."\n".' ?>';
 //echo $s;
 // 生成 加密后的PHP文件
 $fpp1 = fopen('temp_'.$filename, 'w');
 fwrite($fpp1, $s) or die('写文件错误');  

 ?>

加密方法三：

<?php  

 class text_auth
 {
     var $n_iter;  

     function text_auth()
     {
         $this->setIter(32);
     }  

     function setIter($n_iter)
     {
         $this->n_iter = $n_iter;
     }  

     function getIter()
     {
         return $this->n_iter;
     }  

     function encrypt($data, $key)
     {
         $n = $this->_resize($data, 4);  

         $data_long[0]   = $n;
         $n_data_long    = $this->_str2long(1, $data, $data_long);  

         $n = count($data_long);
         if (($n & 1) == 1) {
             $data_long[$n] = chr(0);
             $n_data_long++;
         }  

         $this->_resize($key, 16, true);
         if ( '' == $key )
             $key = '0000000000000000';  

         $n_key_long = $this->_str2long(0, $key, $key_long);  

         $enc_data   = '';
         $w          = array(0, 0);
         $j          = 0;
         $k          = array(0, 0, 0, 0);
         for ($i = 0; $i < $n_data_long; ++$i) {
             if ($j + 4 <= $n_key_long) {
                 $k[0] = $key_long[$j];
                 $k[1] = $key_long[$j + 1];
                 $k[2] = $key_long[$j + 2];
                 $k[3] = $key_long[$j + 3];
             } else {
                 $k[0] = $key_long[$j % $n_key_long];
                 $k[1] = $key_long[($j + 1) % $n_key_long];
                 $k[2] = $key_long[($j + 2) % $n_key_long];
                 $k[3] = $key_long[($j + 3) % $n_key_long];
             }
             $j = ($j + 4) % $n_key_long;  

             $this->_encipherLong($data_long[$i], $data_long[++$i], $w, $k);  

             $enc_data .= $this->_long2str($w[0]);
             $enc_data .= $this->_long2str($w[1]);
         }  

         return $enc_data;
     }  

     function decrypt($enc_data, $key)
     {
         $n_enc_data_long = $this->_str2long(0, $enc_data, $enc_data_long);  

         $this->_resize($key, 16, true);
         if ( '' == $key )
             $key = '0000000000000000';  

         $n_key_long = $this->_str2long(0, $key, $key_long);  

         $data   = '';
         $w      = array(0, 0);
         $j      = 0;
         $len    = 0;
         $k      = array(0, 0, 0, 0);
         $pos    = 0;  

         for ($i = 0; $i < $n_enc_data_long; $i += 2) {
             if ($j + 4 <= $n_key_long) {
                 $k[0] = $key_long[$j];
                 $k[1] = $key_long[$j + 1];
                 $k[2] = $key_long[$j + 2];
                 $k[3] = $key_long[$j + 3];
             } else {
                 $k[0] = $key_long[$j % $n_key_long];
                 $k[1] = $key_long[($j + 1) % $n_key_long];
                 $k[2] = $key_long[($j + 2) % $n_key_long];
                 $k[3] = $key_long[($j + 3) % $n_key_long];
             }
             $j = ($j + 4) % $n_key_long;  

             $this->_decipherLong($enc_data_long[$i], $enc_data_long[$i + 1], $w, $k);  

             if (0 == $i) {
                 $len = $w[0];
                 if (4 <= $len) {
                     $data .= $this->_long2str($w[1]);
                 } else {
                     $data .= substr($this->_long2str($w[1]), 0, $len % 4);
                 }
             } else {
                 $pos = ($i - 1) * 4;
                 if ($pos + 4 <= $len) {
                     $data .= $this->_long2str($w[0]);  

                     if ($pos + 8 <= $len) {
                         $data .= $this->_long2str($w[1]);
                     } elseif ($pos + 4 < $len) {
                         $data .= substr($this->_long2str($w[1]), 0, $len % 4);
                     }
                 } else {
                     $data .= substr($this->_long2str($w[0]), 0, $len % 4);
                 }
             }
         }
         return $data;
     }  

     function _encipherLong($y, $z, &$w, &$k)
     {
         $sum    = (integer) 0;
         $delta  = 0x9E3779B9;
         $n      = (integer) $this->n_iter;  

         while ($n-- > 0) {
             $y      = $this->_add($y,
                                   $this->_add($z << 4 ^ $this->_rshift($z, 5), $z) ^
                                     $this->_add($sum, $k[$sum & 3]));
             $sum    = $this->_add($sum, $delta);
             $z      = $this->_add($z,
                                   $this->_add($y << 4 ^ $this->_rshift($y, 5), $y) ^
                                     $this->_add($sum, $k[$this->_rshift($sum, 11) & 3]));
         }  

         $w[0] = $y;
         $w[1] = $z;
     }  

     function _decipherLong($y, $z, &$w, &$k)
     {
         $sum    = 0xC6EF3720;
         $delta  = 0x9E3779B9;
         $n      = (integer) $this->n_iter;  

         while ($n-- > 0) {
             $z      = $this->_add($z,
                                   -($this->_add($y << 4 ^ $this->_rshift($y, 5), $y) ^
                                         $this->_add($sum, $k[$this->_rshift($sum, 11) & 3])));
             $sum    = $this->_add($sum, -$delta);
             $y      = $this->_add($y,
                                   -($this->_add($z << 4 ^ $this->_rshift($z, 5), $z) ^
                                         $this->_add($sum, $k[$sum & 3])));
         }  

         $w[0] = $y;
         $w[1] = $z;
     }  

     function _resize(&$data, $size, $nonull = false)
     {
         $n      = strlen($data);
         $nmod   = $n % $size;
         if ( 0 == $nmod )
             $nmod = $size;  

         if ($nmod > 0) {
             if ($nonull) {
                 for ($i = $n; $i < $n - $nmod + $size; ++$i) {
                     $data[$i] = $data[$i % $n];
                 }
             } else {
                 for ($i = $n; $i < $n - $nmod + $size; ++$i) {
                     $data[$i] = chr(0);
                 }
             }
         }
         return $n;
     }  

     function _hex2bin($str)
     {
         $len = strlen($str);
         return pack('H' . $len, $str);
     }  

     function _str2long($start, &$data, &$data_long)
     {
         $n = strlen($data);  

         $tmp    = unpack('N*', $data);
         $j      = $start;  

         foreach ($tmp as $value)
             $data_long[$j++] = $value;  

         return $j;
     }  

     function _long2str($l)
     {
         return pack('N', $l);
     }  

     function _rshift($integer, $n)
     {
         if (0xffffffff < $integer || -0xffffffff > $integer) {
             $integer = fmod($integer, 0xffffffff + 1);
         }  

         if (0x7fffffff < $integer) {
             $integer -= 0xffffffff + 1.0;
         } elseif (-0x80000000 > $integer) {
             $integer += 0xffffffff + 1.0;
         }  

         if (0 > $integer) {
             $integer &= 0x7fffffff;
             $integer >>= $n;
             $integer |= 1 << (31 - $n);
         } else {
             $integer >>= $n;
         }  

         return $integer;
     }  

     function _add($i1, $i2)
     {
         $result = 0.0;  

         foreach (func_get_args() as $value) {
             if (0.0 > $value) {
                 $value -= 1.0 + 0xffffffff;
             }  

             $result += $value;
         }  

         if (0xffffffff < $result || -0xffffffff > $result) {
             $result = fmod($result, 0xffffffff + 1);
         }  

         if (0x7fffffff < $result) {
             $result -= 0xffffffff + 1.0;
         } elseif (-0x80000000 > $result) {
             $result += 0xffffffff + 1.0;
         }
         return $result;
     }
 }
 ?>
使用方法参考如下：
// 加密过程
view sourceprint?
 $text_file = S_ROOT . './456.php';
 $str = @file_get_contents($text_file);  

 require_once S_ROOT . "./text_auth.php";
 $text_auth = new text_auth(64);  

 $str = $text_auth->encrypt($str, "qianyunlai.com");  

 $filename = S_ROOT . './789.php'; // 加密后的文本为二进制，普通的文本编辑器无法正常查看
 file_put_contents($filename, $str);
// 解密过程
view sourceprint
?01 $text_file = S_ROOT . './789.php';
 $str = @file_get_contents($text_file);  

 require_once S_ROOT . "./text_auth.php";
 $text_auth = new text_auth(64);  

 $str = $text_auth->decrypt($str, "qianyunlai.com");  

 $filename = S_ROOT . './456.php';
 file_put_contents($filename, $str);

该方法可以对文本的内容进行 二进制加密 与 解密。

以上几种方法各有各的优点和用处，大家也选择使用。