/// <reference types="node" />
import { SupportedJsonWebKeyAlgorithm } from '../../jwk/algorithms/types/supported-jsonwebkey-algorithm';
import { JsonWebKey } from '../../jwk/jsonwebkey';
import { SupportedJsonWebSignatureAlgorithm } from './types/supported-jsonwebsignature-algorithm';
/**
 * Abstract Base Class for the JSON Web Signature Algorithm.
 *
 * All JSON Web Signature Algorithms **MUST** extend this base class and implement its abstract methods.
 *
 * @see https://www.rfc-editor.org/rfc/rfc7518.html#section-3
 */
export declare abstract class JsonWebSignatureAlgorithm {
    /**
     * Name of the JSON Web Signature Algorithm.
     */
    protected readonly algorithm: SupportedJsonWebSignatureAlgorithm;
    /**
     * Hash Algorithm used to Sign and Verify Messages.
     */
    protected readonly hash?: string;
    /**
     * Type of JSON Web Key supported by this JSON Web Signature Algorithm.
     */
    protected readonly keyType?: SupportedJsonWebKeyAlgorithm;
    /**
     * Instantiates a new JSON Web Signature Algorithm to Sign and Verify Messages.
     *
     * @param algorithm Name of the JSON Web Signature Algorithm.
     * @param hash Hash Algorithm used to Sign and Verify Messages.
     * @param keyType Type of JSON Web Key supported by this JSON Web Signature Algorithm.
     */
    constructor(algorithm: SupportedJsonWebSignatureAlgorithm, hash?: string, keyType?: SupportedJsonWebKeyAlgorithm);
    /**
     * Signs a Message with the provided JSON Web Key.
     *
     * @param message Message to be Signed.
     * @param key JSON Web Key used to Sign the provided Message.
     * @returns Resulting Signature of the provided Message.
     */
    abstract sign(message: Buffer, key?: JsonWebKey): Promise<Buffer>;
    /**
     * Checks if the provided Signature matches the provided Message based on the provided JSON Web Key.
     *
     * @param signature Signature to be matched against the provided Message.
     * @param message Message to be matched against the provided Signature.
     * @param key JSON Web Key used to verify the Signature and Message.
     */
    abstract verify(signature: Buffer, message: Buffer, key?: JsonWebKey): Promise<void>;
    /**
     * Checks if the provided JSON Web Key can be used by the requesting JSON Web Signature Algorithm.
     *
     * @param key JSON Web Key to be checked.
     * @throws {InvalidJsonWebKeyException} The provided JSON Web Key is invalid.
     */
    protected validateJsonWebKey(key: JsonWebKey): void;
}