<?php
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/**
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* Class AES
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* 用于AES加解密数据
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* by:云客 【云游天下，做客四方】,微信号：php-world，欢迎转载，但须注明出处，讨论请加qq群203286137
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* time:2018-04-27
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*/
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class AES
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{
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protected $cipher = MCRYPT_RIJNDAEL_256; //AES加密算法
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protected $mode = MCRYPT_MODE_CBC; //采用cbc加密模式
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protected $key; //密钥
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protected $iv; //cbc模式加密向量，如为空将采用密钥代替
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/**
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* AES constructor.
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*
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* @param $key 密钥
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* @param null $iv 向量 可选 如为空将采用密钥代替
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*
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* @throws Exception
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*/
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public function __construct($key, $iv = NULL)
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{
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if (!extension_loaded("mcrypt")) {
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throw new \Exception("mcrypt extension do not exist. it was DEPRECATED in PHP 7.1.0, and REMOVED in PHP 7.2.0. use OpenSSL instead");
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}
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$this->key = $key;
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$this->iv = $iv;
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}
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/**
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* 加密数据
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* @param $data
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*
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* @return string
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*/
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public function encrypt($data)
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{
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$td = mcrypt_module_open($this->cipher, '', $this->mode, '');
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$key = hash("sha256", $this->key, true);
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$iv = isset($this->iv) ? hash("sha256", $this->iv, true) : $key;
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$data = $this->padding($data);
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mcrypt_generic_init($td, $key, $iv);
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$encryptedData = base64_encode(mcrypt_generic($td, $data));
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mcrypt_generic_deinit($td);
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mcrypt_module_close($td);
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return $encryptedData;
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}
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/**
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* 解密数据
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* @param $data
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*
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* @return bool|string
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*/
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public function decrypt($data)
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{
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$td = mcrypt_module_open($this->cipher, '', $this->mode, '');
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$key = hash("sha256", $this->key, true);
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$iv = isset($this->iv) ? hash("sha256", $this->iv, true) : $key;
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mcrypt_generic_init($td, $key, $iv);
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$decrypted_data = mdecrypt_generic($td, base64_decode($data));
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mcrypt_generic_deinit($td);
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mcrypt_module_close($td);
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return $this->unPadding($decrypted_data);
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}
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/**
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* 填充数据到分组大小的整数倍
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* @param null $data
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*
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* @return string
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*/
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protected function padding($data = null)
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{
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$blockSize = 32; //MCRYPT_RIJNDAEL_256算法的分组大小是32字节
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$pad = $blockSize - (strlen($data) % $blockSize);
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return $data . str_repeat(chr($pad), $pad);
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}
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/**
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* 去掉填充的数据
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* @param null $data
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*
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* @return bool|string
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*/
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protected function unPadding($data = null)
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{
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$pad = ord($data[strlen($data) - 1]);
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if ($pad > strlen($data)) {
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return false;
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}
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if (strspn($data, chr($pad), strlen($data) - $pad) != $pad) {
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return false;
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}
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return substr($data, 0, -1 * $pad);
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}
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/**
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* @return mixed
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*/
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public function getSecretKey()
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{
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return $this->key;
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}
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/**
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* @param mixed $key
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*/
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public function setSecretKey($key)
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{
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$this->key = $key;
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}
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/**
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* @return null
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*/
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public function getIv()
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{
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return $this->iv;
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}
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/**
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* @param null $iv
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*/
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public function setIv($iv)
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{
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$this->iv = $iv;
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}
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}
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?>
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