/**
 *
 * 2key-ratchet
 * Copyright (c) 2016 Peculiar Ventures, Inc
 * Based on https://whispersystems.org/docs/specifications/doubleratchet/ and
 * https://whispersystems.org/docs/specifications/x3dh/ by Open Whisper Systems
 *
 */
import { ECPublicKey } from "../crypto";
import { PreKeyProtocol } from "./prekey";
export declare class PreKeySignedProtocol extends PreKeyProtocol {
    signature: ArrayBuffer;
    sign(key: CryptoKey): Promise<void>;
    verify(key: ECPublicKey): PromiseLike<boolean>;
}