PHP写的加密函数,支持私人密钥(详细介绍)

更新时间：2013年06月09日 16:02:03 作者：

本篇文章是对PHP写的加密函数且支持私人密钥进行了详细的分析介绍，需要的朋友参考下

在开发PHP系统时,会员部分往往是一个必不可少的模块,而密码的处理又是不得不面对的问题,PHP 的 Mcrypt 加密库又需要额外设置,很多人都是直接使用md5()函数加密,这个方法的确安全,但是因为md5是不可逆加密,无法还原密码,因此也有一些不便之处,本文介绍加密函数支持私钥,用起来还是不错的.
代码如下:
PHP:

复制代码代码如下:

<ol><li class="li1"><div class="de1">&nbsp;</div>
</li>
<li class="li1"><div class="de1"><span class="kw2"><?php</span>
 </div>
</li>
<li class="li1"><div class="de1"><span class="co1">// 说明：PHP 写的加密函数,支持私人密钥 </span>
</div>
</li>
<li class="li1"><div class="de1"><span class="co1">// 整理：https://www.jb51.net </span>
</div>
</li>
<li class="li2"><div class="de2">&nbsp;</div>
</li>
<li class="li1"><div class="de1"><span class="kw2">function</span>
 keyED<span class="br0">(</span>
<span class="re0">$txt</span>
,<span class="re0">$encrypt_key</span>
<span class="br0">)</span>
   </div>
</li>
<li class="li1"><div class="de1"><span class="br0">{</span>
   </div>
</li>
<li class="li1"><div class="de1">    <span class="re0">$encrypt_key</span>
 = <span class="kw3">md5</span>
<span class="br0">(</span>
<span class="re0">$encrypt_key</span>
<span class="br0">)</span>
;   </div>
</li>
<li class="li1"><div class="de1">    <span class="re0">$ctr</span>
=<span class="nu0">0</span>
;   </div>
</li>
<li class="li2"><div class="de2">    <span class="re0">$tmp</span>
 = <span class="st0">""</span>
;   </div>
</li>
<li class="li1"><div class="de1">    <span class="kw1">for</span>
 <span class="br0">(</span>
<span class="re0">$i</span>
=<span class="nu0">0</span>
;<span class="re0">$i</span>
<strlen<span class="br0">(</span>
<span class="re0">$txt</span>
<span class="br0">)</span>
;<span class="re0">$i</span>
++<span class="br0">)</span>
   </div>
</li>
<li class="li1"><div class="de1">    <span class="br0">{</span>
   </div>
</li>
<li class="li1"><div class="de1">        <span class="kw1">if</span>
 <span class="br0">(</span>
<span class="re0">$ctr</span>
==<span class="kw3">strlen</span>
<span class="br0">(</span>
<span class="re0">$encrypt_key</span>
<span class="br0">)</span>
<span class="br0">)</span>
 <span class="re0">$ctr</span>
=<span class="nu0">0</span>
;   </div>
</li>
<li class="li1"><div class="de1">        <span class="re0">$tmp</span>
.= <span class="kw3">substr</span>
<span class="br0">(</span>
<span class="re0">$txt</span>
,<span class="re0">$i</span>
,<span class="nu0">1</span>
<span class="br0">)</span>
 ^ <span class="kw3">substr</span>
<span class="br0">(</span>
<span class="re0">$encrypt_key</span>
,<span class="re0">$ctr</span>
,<span class="nu0">1</span>
<span class="br0">)</span>
;   </div>
</li>
<li class="li2"><div class="de2">        <span class="re0">$ctr</span>
++;   </div>
</li>
<li class="li1"><div class="de1">    <span class="br0">}</span>
   </div>
</li>
<li class="li1"><div class="de1">    <span class="kw1">return</span>
 <span class="re0">$tmp</span>
;   </div>
</li>
<li class="li1"><div class="de1"><span class="br0">}</span>
   </div>
</li>
<li class="li1"><div class="de1">&nbsp;</div>
</li>
<li class="li2"><div class="de2"><span class="kw2">function</span>
 encrypt<span class="br0">(</span>
<span class="re0">$txt</span>
,<span class="re0">$key</span>
<span class="br0">)</span>
   </div>
</li>
<li class="li1"><div class="de1"><span class="br0">{</span>
   </div>
</li>
<li class="li1"><div class="de1">    <span class="kw3">srand</span>
<span class="br0">(</span>
<span class="br0">(</span>
double<span class="br0">)</span>
<span class="kw3">microtime</span>
<span class="br0">(</span>
<span class="br0">)</span>
*<span class="nu0">1000000</span>
<span class="br0">)</span>
;   </div>
</li>
<li class="li1"><div class="de1">    <span class="re0">$encrypt_key</span>
 = <span class="kw3">md5</span>
<span class="br0">(</span>
<span class="kw3">rand</span>
<span class="br0">(</span>
<span class="nu0">0</span>
,<span class="nu0">32000</span>
<span class="br0">)</span>
<span class="br0">)</span>
;   </div>
</li>
<li class="li1"><div class="de1">    <span class="re0">$ctr</span>
=<span class="nu0">0</span>
;   </div>
</li>
<li class="li2"><div class="de2">    <span class="re0">$tmp</span>
 = <span class="st0">""</span>
;   </div>
</li>
<li class="li1"><div class="de1">    <span class="kw1">for</span>
 <span class="br0">(</span>
<span class="re0">$i</span>
=<span class="nu0">0</span>
;<span class="re0">$i</span>
<strlen<span class="br0">(</span>
<span class="re0">$txt</span>
<span class="br0">)</span>
;<span class="re0">$i</span>
++<span class="br0">)</span>
   </div>
</li>
<li class="li1"><div class="de1">    <span class="br0">{</span>
   </div>
</li>
<li class="li1"><div class="de1">        <span class="kw1">if</span>
 <span class="br0">(</span>
<span class="re0">$ctr</span>
==<span class="kw3">strlen</span>
<span class="br0">(</span>
<span class="re0">$encrypt_key</span>
<span class="br0">)</span>
<span class="br0">)</span>
 <span class="re0">$ctr</span>
=<span class="nu0">0</span>
;   </div>
</li>
<li class="li1"><div class="de1">        <span class="re0">$tmp</span>
.= <span class="kw3">substr</span>
<span class="br0">(</span>
<span class="re0">$encrypt_key</span>
,<span class="re0">$ctr</span>
,<span class="nu0">1</span>
<span class="br0">)</span>
 . <span class="br0">(</span>
<span class="kw3">substr</span>
<span class="br0">(</span>
<span class="re0">$txt</span>
,<span class="re0">$i</span>
,<span class="nu0">1</span>
<span class="br0">)</span>
 ^ <span class="kw3">substr</span>
<span class="br0">(</span>
<span class="re0">$encrypt_key</span>
,<span class="re0">$ctr</span>
,<span class="nu0">1</span>
<span class="br0">)</span>
<span class="br0">)</span>
;   </div>
</li>
<li class="li2"><div class="de2">        <span class="re0">$ctr</span>
++;   </div>
</li>
<li class="li1"><div class="de1">    <span class="br0">}</span>
   </div>
</li>
<li class="li1"><div class="de1">    <span class="kw1">return</span>
 keyED<span class="br0">(</span>
<span class="re0">$tmp</span>
,<span class="re0">$key</span>
<span class="br0">)</span>
; </div>
</li>
<li class="li1"><div class="de1"><span class="br0">}</span>
   </div>
</li>
<li class="li1"><div class="de1">&nbsp;</div>
</li>
<li class="li2"><div class="de2"><span class="kw2">function</span>
 decrypt<span class="br0">(</span>
<span class="re0">$txt</span>
,<span class="re0">$key</span>
<span class="br0">)</span>
   </div>
</li>
<li class="li1"><div class="de1"><span class="br0">{</span>
   </div>
</li>
<li class="li1"><div class="de1">    <span class="re0">$txt</span>
 = keyED<span class="br0">(</span>
<span class="re0">$txt</span>
,<span class="re0">$key</span>
<span class="br0">)</span>
;   </div>
</li>
<li class="li1"><div class="de1">    <span class="re0">$tmp</span>
 = <span class="st0">""</span>
;   </div>
</li>
<li class="li1"><div class="de1">    <span class="kw1">for</span>
 <span class="br0">(</span>
<span class="re0">$i</span>
=<span class="nu0">0</span>
;<span class="re0">$i</span>
<strlen<span class="br0">(</span>
<span class="re0">$txt</span>
<span class="br0">)</span>
;<span class="re0">$i</span>
++<span class="br0">)</span>
   </div>
</li>
<li class="li2"><div class="de2">    <span class="br0">{</span>
   </div>
</li>
<li class="li1"><div class="de1">        <span class="re0">$md5</span>
 = <span class="kw3">substr</span>
<span class="br0">(</span>
<span class="re0">$txt</span>
,<span class="re0">$i</span>
,<span class="nu0">1</span>
<span class="br0">)</span>
;   </div>
</li>
<li class="li1"><div class="de1">        <span class="re0">$i</span>
++;   </div>
</li>
<li class="li1"><div class="de1">        <span class="re0">$tmp</span>
.= <span class="br0">(</span>
<span class="kw3">substr</span>
<span class="br0">(</span>
<span class="re0">$txt</span>
,<span class="re0">$i</span>
,<span class="nu0">1</span>
<span class="br0">)</span>
 ^ <span class="re0">$md5</span>
<span class="br0">)</span>
;   </div>
</li>
<li class="li1"><div class="de1">    <span class="br0">}</span>
   </div>
</li>
<li class="li2"><div class="de2">    <span class="kw1">return</span>
 <span class="re0">$tmp</span>
;   </div>
</li>
<li class="li1"><div class="de1"><span class="br0">}</span>
  </div>
</li>
<li class="li1"><div class="de1">&nbsp;</div>
</li>
<li class="li1"><div class="de1"><span class="re0">$key</span>
 = <span class="st0">"www.yitu.org"</span>
;   </div>
</li>
<li class="li1"><div class="de1"><span class="re0">$string</span>
 = <span class="st0">"我是加密字符"</span>
;   </div>
</li>
<li class="li2"><div class="de2">&nbsp;</div>
</li>
<li class="li1"><div class="de1"><span class="co1">// encrypt $string, and store it in $enc_text   </span>
</div>
</li>
<li class="li1"><div class="de1"><span class="re0">$enc_text</span>
 = encrypt<span class="br0">(</span>
<span class="re0">$string</span>
,<span class="re0">$key</span>
<span class="br0">)</span>
;   </div>
</li>
<li class="li1"><div class="de1">&nbsp;</div>
</li>
<li class="li1"><div class="de1"><span class="co1">// decrypt the encrypted text $enc_text, and store it in $dec_text   </span>
</div>
</li>
<li class="li2"><div class="de2"><span class="re0">$dec_text</span>
 = decrypt<span class="br0">(</span>
<span class="re0">$enc_text</span>
,<span class="re0">$key</span>
<span class="br0">)</span>
;   </div>
</li>
<li class="li1"><div class="de1">&nbsp;</div>
</li>
<li class="li1"><div class="de1"><span class="kw3">print</span>
 <span class="st0">"加密的 text : $enc_text <Br> "</span>
;   </div>
</li>
<li class="li1"><div class="de1"><span class="kw3">print</span>
 <span class="st0">"解密的 text : $dec_text <Br> "</span>
;   </div>
</li>
<li class="li1"><div class="de1"><span class="kw2">?></span>
 </div>
</li>
<li class="li2"><div class="de2">&nbsp;</div>
</li>
</ol>

每一次加密后的结果是不一样的,大大加强了密码的安全性.

您可能感兴趣的文章:

组合算法的PHP解答方法
有一个数组a,有N 个元素，现在要求从中找出含有任意元素的所有组合个数
2012-02-02
php验证码生成代码
这篇文章主要介绍了php验证码生成代码，仅仅只是需要4个步骤就可以轻松搞定：创建验证码底图，显示验证码内容，增加干扰元素，输出验证码，下面我们来进行步骤拆分，需要的朋友可以参考下
2015-11-11
解决GD中文乱码问题
解决GD中文乱码问题...
2007-02-02
PHP const定义常量及global定义全局常量实例解析
这篇文章主要介绍了PHP const定义常量及global定义全局常量实例解析,文中通过示例代码介绍的非常详细，对大家的学习或者工作具有一定的参考学习价值,需要的朋友可以参考下
2020-05-05
php rename错误原因的查找方法
在本篇文章里小编给大家整理的是一篇关于php rename错误原因的查找方法，有需要的朋友们可以跟着学习参考下。
2021-07-07
Laravel 5.4重新登录实现跳转到登录前页面的原理和方法
在日常开发中，我们经常遇到一个需求，就是用户登陆后存在过期时间，超时用户需重新登录，下面这篇文章主要给大家介绍了关于Laravel 5.4重新登录实现跳转到登录前页面的原理和方法，需要的朋友可以参考借鉴，下面来一起看看吧。
2017-07-07
php数组函数序列之sort() 对数组的元素值进行升序排序
sort() 函数按升序对给定数组的值排序。注释：本函数为数组中的单元赋予新的键名。原有的键名将被删除
2011-11-11
本地机apache配置基于域名的虚拟主机详解
以下是对本地机apache配置基于域名的虚拟主机进行了详细的介绍，需要的朋友可以过来参考下
2013-08-08
PHP设计模式之简单工厂和工厂模式实例分析
这篇文章主要介绍了PHP设计模式之简单工厂和工厂模式,结合实例形式分析了php设计模式中工厂模式的实现方法及相关操作注意事项,需要的朋友可以参考下
2019-03-03
php REMOTE_ADDR之获取访客IP的代码
用php获取访客ip的代码，主要到到了REMOTE_ADDR
2008-04-04