import { Keypair } from 'stellar-sdk';
export declare function encrypt(keys: Keypair, to: string, input: Uint8Array, nonce: Uint8Array | null, authenticate?: Boolean): Promise<Uint8Array>;
export declare function decrypt(keys: Keypair, from: string, input: Uint8Array, nonce: Uint8Array | null, authenticate?: Boolean): Promise<Uint8Array>;