PHP实现的AES加密、解密封装类与用法示例

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;?>