import { Tap } from '@iotize/tap';
import { EncryptionKeys, EncryptionOptions } from './scram-interceptor';
export interface EncryptionSessionState {
    enabled?: boolean;
    keys?: EncryptionKeys;
    frameCounter?: number;
}
export declare class TapEncryption {
    private tap;
    private scramInterceptor;
    get isStarted(): boolean;
    constructor(tap: Tap);
    setEncryptionKeys(keys: EncryptionKeys): void;
    setEncryptedFrameCounter(frameCounter: number): void;
    getEncryptionOptions(): EncryptionOptions;
    refreshEncryptionInitializationVector(): Promise<void>;
    setInitializationVectorRefreshPeriod(period: number): void;
    /**
     * Enable encryption
     */
    start(): Promise<Uint8Array<ArrayBufferLike>>;
    /**
     * Disable encryption
     */
    stop(): void;
    /**
     * Pause encryption
     */
    pause(): void;
    /**
     * Pause encryption
     */
    resume(): void;
    /**
     * Setter for the session key
     * @param key if null, it will stop encryption and remove session key. If true it will update session key used for encryption
     */
    set sessionKey(key: Uint8Array | undefined);
    /**
     * Get current session key for encrypted communicatioin
     */
    get sessionKey(): Uint8Array | undefined;
}