PHP的AES加密算法完整实例

本文实例讲述了PHP的AES加密算法。分享给大家供大家参考，具体如下：

    <?php
    class MCrypt {
      private $hex_iv = '00000000000000000000000000000000'; # converted JAVA byte code in to HEX and placed it here
      private $key = 'U1MjU1M0FDOUZ.Qz'; #Same as in JAVA
      function __construct() {
        $this->key = hash('sha256', $this->key, true);
        //echo $this->key.'<br/>';
      }
      function encrypt($str) {
        $td = mcrypt_module_open(MCRYPT_RIJNDAEL_128, '', MCRYPT_MODE_CBC, '');
        mcrypt_generic_init($td, $this->key, $this->hexToStr($this->hex_iv));
        $block = mcrypt_get_block_size(MCRYPT_RIJNDAEL_128, MCRYPT_MODE_CBC);
        $pad = $block - (strlen($str) % $block);
        $str .= str_repeat(chr($pad), $pad);
        $encrypted = mcrypt_generic($td, $str);
        mcrypt_generic_deinit($td);
        mcrypt_module_close($td);
        return base64_encode($encrypted);
      }
      function decrypt($code) {
        $td = mcrypt_module_open(MCRYPT_RIJNDAEL_128, '', MCRYPT_MODE_CBC, '');
        mcrypt_generic_init($td, $this->key, $this->hexToStr($this->hex_iv));
        $str = mdecrypt_generic($td, base64_decode($code));
        $block = mcrypt_get_block_size(MCRYPT_RIJNDAEL_128, MCRYPT_MODE_CBC);
        mcrypt_generic_deinit($td);
        mcrypt_module_close($td);
        return $this->strippadding($str);
      }
      /*
       For PKCS7 padding
       */
      private function addpadding($string, $blocksize = 16) {
        $len = strlen($string);
        $pad = $blocksize - ($len % $blocksize);
        $string .= str_repeat(chr($pad), $pad);
        return $string;
      }
      private function strippadding($string) {
        $slast = ord(substr($string, -1));
        $slastc = chr($slast);
        $pcheck = substr($string, -$slast);
        if (preg_match("/$slastc{" . $slast . "}/", $string)) {
          $string = substr($string, 0, strlen($string) - $slast);
          return $string;
        } else {
          return false;
        }
      }
      function hexToStr($hex)
      {
        $string='';
        for ($i=0; $i < strlen($hex)-1; $i+=2)
        {
          $string .= chr(hexdec($hex[$i].$hex[$i+1]));
        }
        return $string;
      }
    }
    $encryption = new MCrypt();
    echo $encryption->encrypt('123456') . "<br/>";
    echo $encryption->decrypt('tpyxISJ83dqEs3uw8bN/+w==');
    ?>

PS：关于加密解密感兴趣的朋友还可以参考本站在线工具：

密码安全性在线检测：
http://tools.jb51.net/password/my_password_safe

高强度密码生成器：
http://tools.jb51.net/password/CreateStrongPassword

MD5在线加密工具：
http://tools.jb51.net/password/CreateMD5Password

迅雷、快车、旋风URL加密/解密工具：
http://tools.jb51.net/password/urlrethunder

在线散列/哈希算法加密工具：
http://tools.jb51.net/password/hash_encrypt

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面向对象程序设计入门教程》、《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》、《php正则表达式用法总结》、及《php常见数据库操作技巧汇总》

希望本文所述对大家PHP程序设计有所帮助。