/**
 * @license
 * Copyright 2023 Google LLC
 * SPDX-License-Identifier: Apache-2.0
 */
import { PbHpkePublicKey } from '../../../internal/proto';
import { HybridEncrypt } from '../hybrid_encrypt';
import { HpkeAead } from './hpke_aead';
import { HpkeKdf } from './hpke_kdf';
import { HpkeKem } from './hpke_kem';
/**
 * Hybrid Public Key Encryption (HPKE) encryption.
 *
 * @final
 */
export declare class HpkeEncrypt extends HybridEncrypt {
    private static readonly EMPTY_ASSOCIATED_DATA;
    private readonly recipientPublicKey;
    private readonly kem;
    private readonly kdf;
    private readonly aead;
    constructor(recipientPublicKey: PbHpkePublicKey, kem: HpkeKem, kdf: HpkeKdf, aead: HpkeAead);
    /**
     * Returns an HPKE encryption primitive created from a given
     * recipient public key.
     */
    static createHpkeEncrypt(recipientPublicKey: PbHpkePublicKey): Promise<HpkeEncrypt>;
    encrypt(plaintext: Uint8Array, contextInfo?: Uint8Array): Promise<Uint8Array>;
}