/**
   * 拼接需要签名的内容
   * Author: Tao.
   *
   * @param array $data 需签名的字段内容
   * 
   * @return string
   */   
  public static function getSign($data)
  {
    foreach ($data as $k => $v) {
      $Parameters[$k] = $v;
    }
    //按字典序排序参数
    ksort($Parameters);
    $sign = '';
    foreach ($Parameters as $k => $v) {
      $sign .= $k . "=" . $v . "&";
    }
    $sign = '&' . rtrim($sign, '&');
    return $sign;
  }

/**
   * 秘钥加密
   * Author: Tao.
   *
   * @param string $data 之前生成好的需加密内容
   * @param $key 私钥证书位置(.pfx文件)
   * @param string $pwd 证书密码
   *
   * @return string
   */
  public static function SHA1withRSA($data, $key,$pwd)
  {
    openssl_pkcs12_read(file_get_contents($key), $certs, $pwd); 
    if (!$certs) return;
    $signature = '';
    openssl_sign($data, $signature, $certs['pkey']);
    return bin2hex($signature); 
  }

/**
   * 获取公钥
   * Author: Tao.
   *
   * @param $path //公钥证书位置 (.cer文件)
   *
   * @return mixed
   * @throws \Exception
   */
  public static function loadCert($path)
  {
    $file = file_get_contents($path);
    if (!$file) {
      throw new \Exception('loadx509Cert::file_get_contents ERROR');
    }

    $cert = chunk_split(base64_encode($file), 64, "\n");
    $cert = "-----BEGIN CERTIFICATE-----\n" . $cert . "-----END CERTIFICATE-----\n";

    $res = openssl_pkey_get_public($cert);
    $detail = openssl_pkey_get_details($res);
    openssl_free_key($res);

    if (!$detail) {
      throw new \Exception('loadX509Cert::openssl_pkey_get_details ERROR');
    }
    return $detail['key'];
  }

  /**
   * 公钥加密
   * Author: Tao.
   * 
   * @param $pubPath //公钥证书位置 (.cer文件)
   * @param string $bankCode //银行卡号
   * 
   * @return string
   */
  public static function rsa_encode($bankCode,$pubPath)
  {
    $pubkey = self::loadCert($pubPath);
    $encrypt_data = '';
    openssl_public_encrypt($bankCode, $encrypt_data, $pubkey);
    $encrypt_data = base64_encode($encrypt_data);
    return $encrypt_data;
  }

/**
   * 验证返回的签名是否正确
   *
   * @param string $data 要验证的签名原文
   * @param string $signature 签名内容
   *@param $pubPath 公钥证书位置 (.cer文件)
   *
   * @return bool
   */
  public static function verifyRespondSign($data, $signature,$pubPath)
  {
    $keys = self::loadCert($pubPath);
    $signature = hex2bin($signature);
    $ok = openssl_verify($data, $signature, $keys);
    if ($ok == 1) {
      return true;
    }
    return false;
  }