php实现的三个常用加密解密功能函数示例

算法一：
算法二:
算法三（改进第一个加密之后的算法）

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.jb51.net')

{

  $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.jb51.net')

{

  $txt = urldecode($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="脚本之家";

$pwd = lock_url($str);

echo "加密之后：".$pwd."<br/>";

echo "解密还原：".unlock_url($pwd);

运行结果：

加密之后:7MI21MNFgbrlr

解密之后:脚本之家

算法二:

<?php

function passport_encrypt($txt, $key = 'www.jb51.net')

{

  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.jb51.net')

{

  $txt = passport_key(base64_decode(urldecode($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：

ADE%3D

1

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.jb51.net')

{

  $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.jb51.net')

{

  $txt = base64_decode(urldecode($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="脚本之家";

$pwd = lock_url($str);

echo "加密之后：".$pwd."<br/>";

echo "解密还原：".unlock_url($pwd);

运行结果：

加密之后:clNBeVRPSS04VHhzYj0otMHNadjJWUTR5ME4%3D

解密之后:脚本之家

巴特西

php实现的三个常用加密解密功能函数示例

算法一：

算法二:

算法三（改进第一个加密之后的算法）

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