/**
 * @license
 * Copyright 2023 Google LLC
 * SPDX-License-Identifier: Apache-2.0
 */
import { PbHpkePrivateKey } from '../../../internal/proto';
import { HybridDecrypt } from '../hybrid_decrypt';
import { HpkeAead } from './hpke_aead';
import { HpkeKdf } from './hpke_kdf';
import { HpkeKem } from './hpke_kem';
import { HpkeKemPrivateKey } from './hpke_kem_private_key';
/**
 * Hybrid Public Key Encryption (HPKE) decryption.
 *
 * @final
 */
export declare class HpkeDecrypt extends HybridDecrypt {
    private static readonly EMPTY_ASSOCIATED_DATA;
    private readonly recipientPrivateKey;
    private readonly kem;
    private readonly kdf;
    private readonly aead;
    private readonly encapsulatedKeyLength;
    constructor(recipientPrivateKey: HpkeKemPrivateKey, kem: HpkeKem, kdf: HpkeKdf, aead: HpkeAead, encapsulatedKeyLength: number);
    /**
     * Returns the encapsulated key length (in bytes) for the specified
     * `kemProtoEnum`. This value corresponds to the 'Nenc' column in the following
     * table.
     *
     * <p>https://www.rfc-editor.org/rfc/rfc9180.html#name-key-encapsulation-mechanism.
     */
    private static encodingSizeInBytes;
    /**
     * Returns an HPKE decryption primitive created from a given
     * recipientPrivateKey.
     */
    static createHpkeDecrypt(recipientPrivateKey: PbHpkePrivateKey): Promise<HpkeDecrypt>;
    decrypt(ciphertext: Uint8Array, contextInfo?: Uint8Array): Promise<Uint8Array>;
}