/// <reference types="node" />
import { Stream } from 'stream';
import { PrivacyStrategy } from './privacy';
/**
 * The abstract class to be used when creating custom privacy strategy
 * <br>
 * <br>
 * This fixes the privacy type as CUSTOM
 * @see PrivacyType
 */
export declare abstract class CustomPrivacyStrategy implements PrivacyStrategy {
    /**
     * Get the privacy type which is set as CUSTOM
     * @return the privacy type's int value
     * @see PrivacyType
     */
    getPrivacyType(): number;
    abstract decrypt(encryptedStream: Stream): Stream;
    abstract encrypt(stream: Stream): Stream;
}