/// <reference types="node" />
import { DataItem } from './DataItem.js';
import { Signer } from './signing/Signer.js';
export declare function getSignatureAndId(item: DataItem, signer: Signer): Promise<{
    signature: Buffer;
    id: Buffer;
}>;
export declare function sign(item: DataItem, signer: Signer): Promise<Buffer>;