/// <reference types="node" />
/// <reference types="node" />
import { JsonWebKey } from '../../../jwk/jsonwebkey';
import { SupportedJsonWebEncryptionKeyWrapAlgorithm } from './types/supported-jsonwebencryption-keywrap-algorithm';
import { JsonWebEncryptionContentEncryptionAlgorithm } from '../enc/jsonwebencryption-content-encryption.algorithm';
import { JsonWebEncryptionKeyWrapAlgorithm } from './jsonwebencryption-key-wrap.algorithm';
/**
 * Implementation of the JSON Web Encryption AES-GCM Key Wrap Algorithm.
 *
 * @see https://www.rfc-editor.org/rfc/rfc7518.html#section-4.7
 */
declare class GcmAlgorithm extends JsonWebEncryptionKeyWrapAlgorithm {
    /**
     * Size of the Initialization Vector in bits.
     */
    private readonly ivSize;
    /**
     * Size of the Authentication Tag in bytes.
     */
    private readonly authTagLength;
    /**
     * Size of the Content Encryption Key in bits.
     */
    private readonly keySize;
    /**
     * Name of the Cipher Algorithm.
     */
    private readonly cipher;
    /**
     * Instantiates a new JSON Web Encryption AES-GCM Key Wrap Algorithm to Wrap and Unwrap Content Encryption Keys.
     *
     * @param algorithm Name of the JSON Web Encryption Key Wrap Algorithm.
     */
    constructor(algorithm: SupportedJsonWebEncryptionKeyWrapAlgorithm);
    /**
     * Wraps the provided Content Encryption Key using the provide JSON Web Key.
     *
     * @param enc JSON Web Encryption Content Encryption Algorithm.
     * @param key JSON Web Key used to Wrap the provided Content Encryption Key.
     * @returns Wrapped Content Encryption Key and optional additional JSON Web Encryption Header Parameters.
     */
    wrap(enc: JsonWebEncryptionContentEncryptionAlgorithm, key: JsonWebKey): Promise<[Buffer, Buffer, NodeJS.Dict<any>]>;
    /**
     * Unwraps the provided Encrypted Key using the provided JSON Web Key.
     *
     * @param enc JSON Web Encryption Content Encryption Algorithm.
     * @param key JSON Web Key used to Unwrap the Wrapped Content Encryption Key.
     * @param ek Wrapped Content Encryption Key.
     * @param header JSON Web Encryption Header containing the additional Parameters.
     * @returns Unwrapped Content Encryption Key.
     */
    unwrap(enc: JsonWebEncryptionContentEncryptionAlgorithm, key: JsonWebKey, ek: Buffer, header: NodeJS.Dict<any>): Promise<Buffer>;
    /**
     * Checks if the provided JSON Web Key can be used by the requesting JSON Web Encryption AES-GCM Key Wrap Algorithm.
     *
     * @param key JSON Web Key to be checked.
     * @throws {InvalidJsonWebKeyException} The provided JSON Web Key is invalid.
     */
    protected validateJsonWebKey(key: JsonWebKey): void;
}
/**
 * Key wrapping with AES GCM using 128-bit key.
 */
export declare const A128GCMKW: GcmAlgorithm;
/**
 * Key wrapping with AES GCM using 192-bit key.
 */
export declare const A192GCMKW: GcmAlgorithm;
/**
 * Key wrapping with AES GCM using 256-bit key.
 */
export declare const A256GCMKW: GcmAlgorithm;
export {};