PHP 標準AES加密算法類

 
<?php
/**


AES128加解密類
@author dy
/
defined('InEjbuy') or exit('Access Invalid!');
class Aes{
 //密鑰
 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模式加密數據
 $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模式加密數據
 $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;
}
}
</pre>