import * as pkcs11 from "pkcs11js";
import * as core from "../core";
import { MechanismType } from "../mech";
import { Session } from "../session";
import { Key } from '../objects';
/**
 * Represents decryption operation
 */
export declare class Decipher extends core.BaseObject {
    /**
     * Session
     */
    protected session: Session;
    /**
     * Block size
     */
    protected blockSize: number;
    /**
     * Creates a new instance of {@link Decipher}
     * @param session Session
     * @param alg The decryption mechanism
     * @param key The decryption key
     * @param blockSize Block size
     * @param lib PKCS#11 library
     */
    constructor(session: Session, alg: MechanismType, key: Key, blockSize: number, lib: pkcs11.PKCS11);
    /**
     * Continues a multiple-part decryption operation
     * @param data Encrypted data
     * @returns Decrypted block
     */
    update(data: Buffer): Buffer;
    /**
     * Finishes a multiple-part decryption operation
     * @returns Final decrypted block
     */
    final(): Buffer;
    /**
     * Decrypts encrypted data in a single part
     * @param data Encrypted data
     * @param dec Allocated buffer for decrypted data
     * @returns Decrypted data
     */
    once(data: Buffer, dec: Buffer): Buffer;
    /**
     * Decrypts encrypted data in a single part
     * @param data Encrypted data
     * @param dec Allocated buffer for decrypted data
     * @param cb Async callback function with decrypted data
     */
    once(data: Buffer, dec: Buffer, cb: (error: Error, data: Buffer) => void): void;
    /**
     * Initializes a decryption operation
     * @param alg The decryption mechanism
     * @param key The decryption key
     */
    protected init(alg: MechanismType, key: Key): void;
}