import { Writer } from 'protobufjs/minimal';
import { PacketHeader } from './models/PacketHeader';
export declare type Encodable<T> = {
    encode(message: T, writer?: Writer): Writer;
};
export declare type Decodable<T> = {
    decode(input: Uint8Array): T;
};
export declare function encrypt(body: Uint8Array, key: CryptoKey): Promise<Uint8Array>;
export declare function decrypt(body: Uint8Array, key: CryptoKey): Promise<Uint8Array>;
export declare function encode(header: PacketHeader, body: Uint8Array, key: CryptoKey): Promise<Uint8Array>;
export declare function decode<T>(type: Decodable<T>, buf: Uint8Array, serviceKey: CryptoKey, sessionKey: CryptoKey): Promise<[PacketHeader, T]>;