/// <reference types="node" />
import { Stream } from 'stream';
/**
 * The abstract class privacy strategy
 * <br>
 * <br>
 * Privacy strategy handles the encrypting and decrypting of data
 * <br>
 * <br>
 * When creating a custom Privacy Strategy, implement CustomPrivacyStrategy
 */
export declare abstract class PrivacyStrategy {
    /**
     * Get the privacy type's int value
     * @return the privacy type's int value
     */
    abstract getPrivacyType(): number;
    /**
     * Encrypt byte stream
     * @param stream the byte stream to encrypt
     * @return encrypted byte stream
     */
    abstract encrypt(stream: Stream): Stream;
    /**
     * Encrypt byte stream
     * @param encryptedStream the byte stream to decrypt
     * @return the decrypted data
     */
    abstract decrypt(encryptedStream: Stream): Stream;
}