php实现加密解密的算法，如下代码：
51shop 网上商城系统
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51shop 由 PHP 语言开发, 使用快速的 MySQL 数据库保存数据 ,为中小型网站实现网上电子商务提供一个完美的解决方案.一、用户模块1. 用户注册：用户信息包括：用户ID、用户名、用户密码、性别、邮箱、省份、城市、 联系电话等信息，用户注册后不能立即使用，需由管理员激活账号，才可使用（此功能管理员可设置）2. 登录功能3. 资料修改：用户可修改除账号以后的所有资料4. 忘记密码：要求用
<ol class="dp-c"><li class="alt"><span><span><?php </span></span></li><li><span><span class="keyword">class</span><span> Mcrypt </span></span></li><li class="alt"><span>{ </span></li><li><span> <span class="comment">/** </span> </span></li><li class="alt"><span><span class="comment"> * 解密 </span> </span></li><li><span><span class="comment"> * </span> </span></li><li class="alt"><span><span class="comment"> * @param string $encryptedText 已加密字符串 </span> </span></li><li><span><span class="comment"> * @param string $key 密钥 </span> </span></li><li class="alt"><span><span class="comment"> * @return string </span> </span></li><li><span><span class="comment"> */</span><span> </span></span></li><li class="alt"><span> <span class="keyword">public</span><span> </span><span class="keyword">static</span><span> </span><span class="keyword">function</span><span> _decrypt(</span><span class="vars">$encryptedText</span><span>,</span><span class="vars">$key</span><span> = null) </span></span></li><li><span> { </span></li><li class="alt"><span> <span class="vars">$key</span><span> = </span><span class="vars">$key</span><span> === null ? Config::get(</span><span class="string">'secret_key'</span><span>) : </span><span class="vars">$key</span><span>; </span></span></li><li><span> <span class="vars">$cryptText</span><span> = </span><span class="func">base64_decode</span><span>(</span><span class="vars">$encryptedText</span><span>); </span></span></li><li class="alt"><span> <span class="vars">$ivSize</span><span> = mcrypt_get_iv_size(MCRYPT_RIJNDAEL_256, MCRYPT_MODE_ECB); </span></span></li><li><span> <span class="vars">$iv</span><span> = mcrypt_create_iv(</span><span class="vars">$ivSize</span><span>, MCRYPT_RAND); </span></span></li><li class="alt"><span> <span class="vars">$decryptText</span><span> = mcrypt_decrypt(MCRYPT_RIJNDAEL_256, </span><span class="vars">$key</span><span>, </span><span class="vars">$cryptText</span><span>, MCRYPT_MODE_ECB, </span><span class="vars">$iv</span><span>); </span></span></li><li><span> <span class="keyword">return</span><span> trim(</span><span class="vars">$decryptText</span><span>); </span></span></li><li class="alt"><span> } </span></li><li><span> </span></li><li class="alt"><span> <span class="comment">/** </span> </span></li><li><span><span class="comment"> * 加密 </span> </span></li><li class="alt"><span><span class="comment"> * </span> </span></li><li><span><span class="comment"> * @param string $plainText 未加密字符串 </span> </span></li><li class="alt"><span><span class="comment"> * @param string $key 密钥 </span> </span></li><li><span><span class="comment"> */</span><span> </span></span></li><li class="alt"><span> <span class="keyword">public</span><span> </span><span class="keyword">static</span><span> </span><span class="keyword">function</span><span> _encrypt(</span><span class="vars">$plainText</span><span>,</span><span class="vars">$key</span><span> = null) </span></span></li><li><span> { </span></li><li class="alt"><span> <span class="vars">$key</span><span> = </span><span class="vars">$key</span><span> === null ? Config::get(</span><span class="string">'secret_key'</span><span>) : </span><span class="vars">$key</span><span>; </span></span></li><li><span> <span class="vars">$ivSize</span><span> = mcrypt_get_iv_size(MCRYPT_RIJNDAEL_256, MCRYPT_MODE_ECB); </span></span></li><li class="alt"><span> <span class="vars">$iv</span><span> = mcrypt_create_iv(</span><span class="vars">$ivSize</span><span>, MCRYPT_RAND); </span></span></li><li><span> <span class="vars">$encryptText</span><span> = mcrypt_encrypt(MCRYPT_RIJNDAEL_256, </span><span class="vars">$key</span><span>, </span><span class="vars">$plainText</span><span>, MCRYPT_MODE_ECB, </span><span class="vars">$iv</span><span>); </span></span></li><li class="alt"><span> <span class="keyword">return</span><span> trim(</span><span class="func">base64_encode</span><span>(</span><span class="vars">$encryptText</span><span>)); </span></span></li><li><span> } </span></li><li class="alt"><span>} </span></li><li><span> </span></li><li class="alt"><span><span class="comment">//调用</span><span> </span></span></li><li><span><span class="keyword">class</span><span> Cookie </span><span class="keyword">extends</span><span> Mcrypt </span></span></li><li class="alt"><span>{ </span></li><li><span> <span class="comment">/** </span> </span></li><li class="alt"><span><span class="comment"> * 删除cookie </span> </span></li><li><span><span class="comment"> * </span> </span></li><li class="alt"><span><span class="comment"> * @param array $args </span> </span></li><li><span><span class="comment"> * @return boolean </span> </span></li><li class="alt"><span><span class="comment"> */</span><span> </span></span></li><li><span> <span class="keyword">public</span><span> </span><span class="keyword">static</span><span> </span><span class="keyword">function</span><span> del(</span><span class="vars">$args</span><span>) </span></span></li><li class="alt"><span> { </span></li><li><span> <span class="vars">$name</span><span> = </span><span class="vars">$args</span><span>[</span><span class="string">'name'</span><span>]; </span></span></li><li class="alt"><span> <span class="vars">$domain</span><span> = isset(</span><span class="vars">$args</span><span>[</span><span class="string">'domain'</span><span>]) ? </span><span class="vars">$args</span><span>[</span><span class="string">'domain'</span><span>] : null; </span></span></li><li><span> <span class="keyword">return</span><span> isset(</span><span class="vars">$_COOKIE</span><span>[</span><span class="vars">$name</span><span>]) ? setcookie(</span><span class="vars">$name</span><span>, </span><span class="string">''</span><span>, time() - 86400, </span><span class="string">'/'</span><span>, </span><span class="vars">$domain</span><span>) : true; </span></span></li><li class="alt"><span> } </span></li><li><span> </span></li><li class="alt"><span> <span class="comment">/** </span> </span></li><li><span><span class="comment"> * 得到指定cookie的值 </span> </span></li><li class="alt"><span><span class="comment"> * </span> </span></li><li><span><span class="comment"> * @param string $name </span> </span></li><li class="alt"><span><span class="comment"> */</span><span> </span></span></li><li><span> <span class="keyword">public</span><span> </span><span class="keyword">static</span><span> </span><span class="keyword">function</span><span> get(</span><span class="vars">$name</span><span>) </span></span></li><li class="alt"><span> { </span></li><li><span> <span class="keyword">return</span><span> isset(</span><span class="vars">$_COOKIE</span><span>[</span><span class="vars">$name</span><span>]) ? parent::_decrypt(</span><span class="vars">$_COOKIE</span><span>[</span><span class="vars">$name</span><span>]) : null; </span></span></li><li class="alt"><span> } </span></li><li><span> </span></li><li class="alt"><span> <span class="comment">/** </span> </span></li><li><span><span class="comment"> * 设置cookie </span> </span></li><li class="alt"><span><span class="comment"> * </span> </span></li><li><span><span class="comment"> * @param array $args </span> </span></li><li class="alt"><span><span class="comment"> * @return boolean </span> </span></li><li><span><span class="comment"> */</span><span> </span></span></li><li class="alt"><span> <span class="keyword">public</span><span> </span><span class="keyword">static</span><span> </span><span class="keyword">function</span><span> set(</span><span class="vars">$args</span><span>) </span></span></li><li><span> { </span></li><li class="alt"><span> <span class="vars">$name</span><span> = </span><span class="vars">$args</span><span>[</span><span class="string">'name'</span><span>]; </span></span></li><li><span> <span class="vars">$value</span><span>= parent::_encrypt(</span><span class="vars">$args</span><span>[</span><span class="string">'value'</span><span>]); </span></span></li><li class="alt"><span> <span class="vars">$expire</span><span> = isset(</span><span class="vars">$args</span><span>[</span><span class="string">'expire'</span><span>]) ? </span><span class="vars">$args</span><span>[</span><span class="string">'expire'</span><span>] : null; </span></span></li><li><span> <span class="vars">$path</span><span> = isset(</span><span class="vars">$args</span><span>[</span><span class="string">'path'</span><span>]) ? </span><span class="vars">$args</span><span>[</span><span class="string">'path'</span><span>] : </span><span class="string">'/'</span><span>; </span></span></li><li class="alt"><span> <span class="vars">$domain</span><span> = isset(</span><span class="vars">$args</span><span>[</span><span class="string">'domain'</span><span>]) ? </span><span class="vars">$args</span><span>[</span><span class="string">'domain'</span><span>] : null; </span></span></li><li><span> <span class="vars">$secure</span><span> = isset(</span><span class="vars">$args</span><span>[</span><span class="string">'secure'</span><span>]) ? </span><span class="vars">$args</span><span>[</span><span class="string">'secure'</span><span>] : 0; </span></span></li><li class="alt"><span> <span class="keyword">return</span><span> setcookie(</span><span class="vars">$name</span><span>, </span><span class="vars">$value</span><span>, </span><span class="vars">$expire</span><span>, </span><span class="vars">$path</span><span>, </span><span class="vars">$domain</span><span>, </span><span class="vars">$secure</span><span>); </span></span></li><li><span> } </span></li><li class="alt"><span>} </span></li></ol>
