/*! Copyright (c) Microsoft. All rights reserved.
 *! Licensed under the MIT license. See LICENSE file in the project root for full license information.
 */
/// <reference types="node" />
/**
 * Returns the seconds elapsed since 1 January 1970 00:00:00 UTC until one
 * hour from now.
 *
 * @function anHourFromNow
 */
export declare function anHourFromNow(): number;
export declare function encodeUriComponentStrict(str: string): string;
export declare function stringToSign(resourceUri: string, expiry: string): string;
export declare function hmacHash(password: string, stringToSign: string): string;
/**
 * Configuration structure used by transports and `AuthenticationProvider` objects to store and exchange credentials.
 *
 */
export interface TransportConfig {
    /**
     * Hostname of the Azure IoT hub instance.
     */
    host: string;
    /**
     * Device unique identifier.
     */
    deviceId: string;
    /**
     * Module unique identifier.
     */
    moduleId?: string;
    /**
     * Shared access signature security token used to authenticate a device when token-based authentication is used.
     */
    sharedAccessSignature?: string;
    /**
     * Name of the policy which shared access key is used to sign security tokens.
     */
    sharedAccessKeyName?: string;
    /**
     * Shared access key is used to sign security tokens.
     */
    sharedAccessKey?: string;
    /**
     * Object containing the certificate and key used by the device to connect and authenticate with the Azure IoT hub instance.
     */
    x509?: X509;
    /**
     * IP address or internet name of the host machine working as a device or protocol gateway.  Used when communicating with Azure Edge devices.
     */
    gatewayHostName?: string;
}
/**
 * Object used to store an X509 certificate and key for transports to use.
 *
 * This is passed directly down to the low-level objects used by Node.js to connect the TLS socket.
 * https://nodejs.org/api/tls.html#tls_tls_connect_options_callback
 */
export interface X509 {
    /**
     * X509 Certificate.
     */
    cert?: string | string[] | Buffer | Buffer[];
    /**
     * Key associated with the X509 certificate.
     */
    key?: string | Buffer;
    /**
     * Passphrase used to decode the key associated with the X509 certificate.
     */
    passphrase?: string;
    /**
     * Name of an OpenSSL engine which can provide the client certificate.
     */
    clientCertEngine?: string;
    /**
     * @private
     */
    certFile?: string;
    /**
     * @private
     */
    keyFile?: string;
}