import { Header } from './header';
import { type Label } from './map';
import { Key, type MACer } from './key';
/**
 * Mac0Message represents a COSE_Mac0 object.
 *
 * Use this structure when the MAC key is known implicitly. The tag covers the
 * protected header bytes, optional externalData, and payload through the RFC
 * 9052 MAC_structure.
 *
 * @example
 * ```ts
 * const key = HMACKey.generate(iana.AlgorithmHMAC_256_256)
 * const aad = utf8ToBytes('profile:v1')
 * const cose = new Mac0Message(payload).toBytes(key, aad)
 * const verified = Mac0Message.fromBytes(key, cose, aad)
 * ```
 *
 * Reference https://datatracker.ietf.org/doc/html/rfc9052#name-maced-messages-with-implici.
 */
export declare class Mac0Message {
    payload: Uint8Array;
    protected: Header | null;
    unprotected: Header | null;
    private static macBytes;
    static fromBytes(key: Key & MACer, coseData: Uint8Array, externalData?: Uint8Array, understoodCriticalLabels?: Iterable<Label>): Mac0Message;
    static withTag(coseData: Uint8Array): Uint8Array;
    /**
     * @param payload - The payload bytes to authenticate.
     * @param protectedHeader - Optional protected (authenticated) header. When
     *   omitted, `toBytes` creates one and sets `alg` from the MAC key.
     * @param unprotected - Optional unprotected header. When omitted, `toBytes`
     *   creates one and copies the key's `kid` if present.
     */
    constructor(payload: Uint8Array, protectedHeader?: Header, unprotected?: Header);
    toBytes(key: Key & MACer, externalData?: Uint8Array): Uint8Array;
}