/// <reference types="node" />
import { Stream } from 'stream';
import { PrivacyStrategy } from './privacy';
/**
 * The privacy strategy that secures data using the NEM keys (a private key and a public key).
 * This strategy encrypt and decrypt the data using both private and public keys
 */
export declare class NemPrivacyStrategy implements PrivacyStrategy {
    readonly privateKey: string;
    readonly publicKey: string;
    /**
     * Create instance of this strategy
     * @param privateKey the private key
     * @param publicKey the public key
     * @return the instance of this strategy
     */
    static create(privateKey: string, publicKey: string): NemPrivacyStrategy;
    protected constructor(privateKey: string, publicKey: string);
    /**
     * Get the privacy type which is set as NEMKEYS
     * @return the privacy type's int value
     * @see PrivacyType
     */
    getPrivacyType(): number;
    /**
     * Encrypt byte stream using the private and public keys provided
     * @param stream the byte stream to encrypt
     * @return the encrypted byte stream
     */
    encrypt(stream: Stream): Stream;
    /**
     * Encrypt byte stream using the private and public keys provided
     * @param encryptedStream the byte stream to decrypt
     * @return the decrypted byte stream
     */
    decrypt(encryptedStream: Stream): Stream;
}