标准PHP的AES加密算法类

<?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';
??? }
??? /**
???? * 加密办法
???? * @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);
??? }
??? /**
???? * 解密办法
???? * @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_RAND);
??????? $encrypt_str =? mcrypt_decrypt(MCRYPT_RIJNDAEL_128,$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,-$num);
??????? return $source;
??? }
}