PHP实现的AES加密、解密封装类与用法示例

更新时间：2020-03-29 11:58:12 作者：startmvc

本文实例讲述了PHP实现的AES加密、解密封装类与用法。分享给大家供大家参考，具体如下：

本文实例讲述了PHP实现的AES加密、解密封装类与用法。分享给大家供大家参考，具体如下：


<?php
/**
 * Class AES
 * 用于AES加解密数据
 * time:2018-04-27
 */
class AES
{
 protected $cipher = MCRYPT_RIJNDAEL_256; //AES加密算法
 protected $mode = MCRYPT_MODE_CBC; //采用cbc加密模式
 protected $key; //密钥
 protected $iv; //cbc模式加密向量，如为空将采用密钥代替
 /**
 * AES constructor.
 *
 * @param $key 密钥
 * @param null $iv 向量 可选 如为空将采用密钥代替
 *
 * @throws Exception
 */
 public function __construct($key, $iv = NULL)
 {
 if (!extension_loaded("mcrypt")) {
// throw new \Exception("mcrypt extension do not exist. it was DEPRECATED in PHP 7.1.0, and REMOVED in PHP 7.2.0. use OpenSSL instead");
 }
 $this->key = $key;
 $this->iv = $iv;
 }
 /**
 * 加密数据
 * @param $data
 *
 * @return string
 */
 public function encrypt($data)
 {
 $td = mcrypt_module_open($this->cipher, '', $this->mode, '');
 $key = hash("sha256", $this->key, true);
 $iv = isset($this->iv) ? hash("sha256", $this->iv, true) : $key;
 $data = $this->padding($data);
 mcrypt_generic_init($td, $key, $iv);
 $encryptedData = base64_encode(mcrypt_generic($td, $data));
 mcrypt_generic_deinit($td);
 mcrypt_module_close($td);
 return $encryptedData;
 }
 /**
 * 解密数据
 * @param $data
 *
 * @return bool|string
 */
 public function decrypt($data)
 {
 $td = mcrypt_module_open($this->cipher, '', $this->mode, '');
 $key = hash("sha256", $this->key, true);
 $iv = isset($this->iv) ? hash("sha256", $this->iv, true) : $key;
 mcrypt_generic_init($td, $key, $iv);
 $decrypted_data = mdecrypt_generic($td, base64_decode($data));
 mcrypt_generic_deinit($td);
 mcrypt_module_close($td);
 return $this->unPadding($decrypted_data);
 }
 /**
 * 填充数据到分组大小的整数倍
 * @param null $data
 *
 * @return string
 */
 protected function padding($data = null)
 {
 $blockSize = 32; //MCRYPT_RIJNDAEL_256算法的分组大小是32字节
 $pad = $blockSize - (strlen($data) % $blockSize);
 return $data . str_repeat(chr($pad), $pad);
 }
 /**
 * 去掉填充的数据
 * @param null $data
 *
 * @return bool|string
 */
 protected function unPadding($data = null)
 {
 $pad = ord($data[strlen($data) - 1]);
 if ($pad > strlen($data)) {
 return false;
 }
 if (strspn($data, chr($pad), strlen($data) - $pad) != $pad) {
 return false;
 }
 return substr($data, 0, -1 * $pad);
 }
 /**
 * @return mixed
 */
 public function getSecretKey()
 {
 return $this->key;
 }
 /**
 * @param mixed $key
 */
 public function setSecretKey($key)
 {
 $this->key = $key;
 }
 /**
 * @return null
 */
 public function getIv()
 {
 return $this->iv;
 }
 /**
 * @param null $iv
 */
 public function setIv($iv)
 {
 $this->iv = $iv;
 }
}
//使用方法：
$keyStr = 'sq8f77fwhksk';
$aes = new AES($keyStr);
$str = 'www.jb51.net';
$chgstr = $aes->encrypt($str);
echo $chgstr;
echo "<br/>";
$rstr = $aes->decrypt($chgstr);
echo $rstr;
?>

运行结果：