PHP 标准AES加密算法类

分享一个标准PHP的AES加密算法类，其中mcrypt_get_block_size('rijndael-128', 'ecb');，如果在不明白原理的情况下比较容易搞错，可以通过mcrypt_list_algorithms函数查看你需要的加密算法标识。

 

<?php

/**

 * AES128加解密类

 * @author dy

 *

 */

defined('InEjbuy') or exit('Access Invalid!');

class Aes{

    //密钥

    private $_secrect_key;

      

    public function __construct(){

        $this->_secrect_key = 'MYgGnQE2jDFADSFFDSEWsdD';

    }

    /**

     * 加密方法

     * @param string $str

     * @return string

     */

    public function encrypt($str){

        //AES, 128 ECB模式加密数据

        $screct_key = $this->_secrect_key;

        $screct_key = base64_decode($screct_key);

        $str = trim($str);

        $str = $this->addPKCS7Padding($str);

        $iv = mcrypt_create_iv(mcrypt_get_iv_size(MCRYPT_RIJNDAEL_128,MCRYPT_MODE_ECB),MCRYPT_RAND);

        $encrypt_str =  mcrypt_encrypt(MCRYPT_RIJNDAEL_128, $screct_key, $str, MCRYPT_MODE_ECB, $iv);

        return base64_encode($encrypt_str);

    }

      

    /**

     * 解密方法

     * @param string $str

     * @return string

     */

    public function decrypt($str){

        //AES, 128 ECB模式加密数据

        $screct_key = $this->_secrect_key;

        $str = base64_decode($str);

        $screct_key = base64_decode($screct_key);

        $iv = mcrypt_create_iv(mcrypt_get_iv_size(MCRYPT_RIJNDAEL_128,MCRYPT_MODE_ECB),MCRYPT_RAND);

        $encrypt_str =  mcrypt_decrypt(MCRYPT_RIJNDAEL_128, $screct_key, $str, MCRYPT_MODE_ECB, $iv);

        $encrypt_str = trim($encrypt_str);

        $encrypt_str = $this->stripPKSC7Padding($encrypt_str);

        return $encrypt_str;

      

    }

      

    /**

     * 填充算法

     * @param string $source

     * @return string

     */

    function addPKCS7Padding($source){

        $source = trim($source);

        $block = mcrypt_get_block_size('rijndael-128', 'ecb');

        $pad = $block - (strlen($source) % $block);

        if ($pad <= $block) {

            $char = chr($pad);

            $source .= str_repeat($char, $pad);

        }

        return $source;

    }

    /**

     * 移去填充算法

     * @param string $source

     * @return string

     */

    function stripPKSC7Padding($source){

        $source = trim($source);

        $char = substr($source, -1);

        $num = ord($char);

        if($num==62)return $source;

        $source = substr($source,0,-$num);

        return $source;

    }

}