php实现的三个常用加密解密功能函数示例


            本文实例讲述了php实现的三个常用加密解密功能函数。分享给大家供大家参考，具体如下：

算法一：





//加密函数

function lock_url($txt,$key='www.zwyuanma.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.zwyuanma.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);

}







用法：





$str="中文源码网";

$pwd = lock_url($str);

echo "加密之后：".$pwd."<br/>";

echo "解密还原：".unlock_url($pwd);







运行结果：



算法二：





<?php

function passport_encrypt($txt, $key = 'www.zwyuanma.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.zwyuanma.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; 

} 

?>







用法：





<?php

$txt = "1";

$key = "testkey";

$encrypt = passport_encrypt($txt,$key);

$decrypt = passport_decrypt($encrypt,$key);

echo $encrypt."<br>";

echo $decrypt."<br>";

?>



运行结果：



算法三（改进第一个加密之后的算法）





//加密函数

function lock_url($txt,$key='www.zwyuanma.com')

{

  $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='www.zwyuanma.com')

{

  $txt = base64_decode(urldecode($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);

}



用法：





$str="中文源码网";

$pwd = lock_url($str);

echo "加密之后：".$pwd."<br/>";

echo "解密还原：".unlock_url($pwd);



运行结果：



PS：关于加密解密感兴趣的朋友还可以参考本站在线工具：

文字在线加密解密工具（包含AES、DES、RC4等）：

http://tools.zwyuanma.com/password/txt_encode 

MD5在线加密工具:

http://tools.zwyuanma.com/password/CreateMD5Password

在线散列/哈希算法加密工具:

http://tools.zwyuanma.com/password/hash_encrypt

在线MD5/hash/SHA-1/SHA-2/SHA-256/SHA-512/SHA-3/RIPEMD-160加密工具：

http://tools.zwyuanma.com/password/hash_md5_sha

在线sha1/sha224/sha256/sha384/sha512加密工具：

http://tools.zwyuanma.com/password/sha_encode

更多关于PHP相关内容感兴趣的读者可查看本站专题：《php加密方法总结》、《PHP编码与转码操作技巧汇总》、《PHP数学运算技巧总结》、《PHP数组(Array)操作技巧大全》、《php字符串(string)用法总结》、《PHP数据结构与算法教程》、《php程序设计算法总结》及《php正则表达式用法总结》

希望本文所述对大家PHP程序设计有所帮助。