/**
 * Context encapsulating the cryptography bits required for E2EE.
 * This uses the WebRTC Insertable Streams API which is explained in
 *   https://github.com/alvestrand/webrtc-media-streams/blob/master/explainer.md
 * that provides access to the encoded frames and allows them to be transformed.
 *
 * The encoded frame format is explained below in the _encodeFunction method.
 * High level design goals were:
 * - do not require changes to existing SFUs and retain (VP8) metadata.
 * - allow the SFU to rewrite SSRCs, timestamp, pictureId.
 * - allow for the key to be rotated frequently.
 */
export default class E2EEcontext {
    /**
     * Build a new E2EE context instance, which will be used in a given conference.
     * @param {boolean} [options.sharedKey] - whether there is a uniques key shared amoung all participants.
     */
    constructor({ sharedKey }?: boolean);
    _worker: Worker;
    /**
     * Cleans up all state associated with the given participant. This is needed when a
     * participant leaves the current conference.
     *
     * @param {string} participantId - The participant that just left.
     */
    cleanup(participantId: string): void;
    /**
     * Cleans up all state associated with all participants in the conference. This is needed when disabling e2ee.
     *
     */
    cleanupAll(): void;
    /**
     * Handles the given {@code RTCRtpReceiver} by creating a {@code TransformStream} which will inject
     * a frame decoder.
     *
     * @param {RTCRtpReceiver} receiver - The receiver which will get the decoding function injected.
     * @param {string} kind - The kind of track this receiver belongs to.
     * @param {string} participantId - The participant id that this receiver belongs to.
     */
    handleReceiver(receiver: RTCRtpReceiver, kind: string, participantId: string): void;
    /**
     * Handles the given {@code RTCRtpSender} by creating a {@code TransformStream} which will inject
     * a frame encoder.
     *
     * @param {RTCRtpSender} sender - The sender which will get the encoding function injected.
     * @param {string} kind - The kind of track this sender belongs to.
     * @param {string} participantId - The participant id that this sender belongs to.
     */
    handleSender(sender: RTCRtpSender, kind: string, participantId: string): void;
    /**
     * Set the E2EE key for the specified participant.
     *
     * @param {string} participantId - the ID of the participant who's key we are setting.
     * @param {Uint8Array | boolean} key - they key for the given participant.
     * @param {Number} keyIndex - the key index.
     */
    setKey(participantId: string, key: Uint8Array | boolean, keyIndex: number): void;
}