/**
 * @license
 * Copyright 2022 Google LLC
 * SPDX-License-Identifier: Apache-2.0
 */
import { HpkeKemEncapOutput } from './hpke_kem_encap_output';
import { HpkeKemPrivateKey } from './hpke_kem_private_key';
/**
 * Interface for Hybrid Public Key Encryption (HPKE) key encapsulation mechanism
 * (KEM).
 *
 * HPKE RFC is available at https://www.rfc-editor.org/rfc/rfc9180.html.
 */
export interface HpkeKem {
    /**
     * Generates and encapsulates a shared secret using the `recipientPublicKey`.
     * Returns a `HpkeKemEncapOutput` object that contains the raw shared secret
     * and the encapsulated key. The HPKE RFC refers to this method as Encap(),
     * which is used by the sender.
     *
     * @throws SecurityException when either the shared secret cannot be generated
     * or the shared secret cannot be encapsulated.
     */
    encapsulate(recipientPublicKey: Uint8Array): Promise<HpkeKemEncapOutput>;
    /**
     * Extracts the shared secret from `encapsulatedKey` using
     * `recipientPrivateKey`. Returns the raw shared secret. The HPKE RFC refers
     * to this method as Decap(), which is used by the recipient.
     *
     * @throws SecurityException if the shared secret cannot be extracted.
     */
    decapsulate(encapsulatedKey: Uint8Array, recipientPrivateKey: HpkeKemPrivateKey): Promise<Uint8Array>;
    /**
     * Returns the HPKE KEM algorithm identifier for the underlying KEM
     * implementation.
     *
     * @see https://www.rfc-editor.org/rfc/rfc9180.html#name-key-encapsulation-mechanism.
     */
    getKemId(): Uint8Array;
}