<?php/**
* AES128加解密类
* @author dy
*
*/class Aes{
//密钥
private $_secrect_key; public function __construct(){
$this->_secrect_key =md5("password");
} /**
* 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 $source
* @return string
*/
private function addPKCS7Padding($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 $source
* @return string
*/
private function stripPKSC7Padding($source){
$source = trim($source); $char = substr($source, -1); $num = ord($char); if($num==62)return $source; $source = substr($source,0,-$num); return $source;
}
}$c=new Aes();echo $c->encrypt("sdsadadsa555444");echo '<hr>';echo $c->decrypt("dT3Fb9SfHkoOQpXeHxzJwQ==");echo '<hr>';
