/**
 * @license
 * Copyright 2022 Google LLC
 * SPDX-License-Identifier: Apache-2.0
 */
import { HpkeAead } from './hpke_aead';
import { HpkeKdf } from './hpke_kdf';
import { HpkeKem } from './hpke_kem';
import { NistCurvesHpkeKemPrivateKey } from './nist_curves_hpke_kem_private_key';
/**
 * Hybrid Public Key Encryption (HPKE) context for either a sender or a
 * recipient.
 *
 * @see https://www.rfc-editor.org/rfc/rfc9180.html#name-creating-the-encryption-con
 */
export declare class HpkeContext {
    private readonly encapsulatedKey;
    private readonly key;
    private readonly baseNonce;
    private readonly aead;
    private sequenceNumber;
    private readonly maxSequenceNumber;
    constructor(encapsulatedKey: Uint8Array, key: Uint8Array, baseNonce: Uint8Array, aead: HpkeAead);
    /**
     * Performs AEAD encryption of `plaintext` with `associatedData`
     * according to `ContextS.Seal()` as defined in
     * @see https://www.rfc-editor.org/rfc/rfc9180.html#section-5.2-8.
     */
    seal(plaintext: Uint8Array, associatedData: Uint8Array): Promise<Uint8Array>;
    /**
     * Performs AEAD decryption of `ciphertext` with `associatedData`
     * according to `ContextR.Open()` as defined in
     * @see https://www.rfc-editor.org/rfc/rfc9180.html#section-5.2-10.
     */
    open(ciphertext: Uint8Array, associatedData: Uint8Array): Promise<Uint8Array>;
    /**
     * Computes nonce according to `ComputeNonce` as defined in
     * @see https://www.rfc-editor.org/rfc/rfc9180.html#section-5.2-11.
     * for seal/open and increments the sequence number.
     */
    private computeNonceAndIncrementSequenceNumber;
    getKey(): Uint8Array;
    getBaseNonce(): Uint8Array;
    getEncapsulatedKey(): Uint8Array;
}
/** Helper function factored out to facilitate unit testing. */
export declare function createContext(encapsulatedKey: Uint8Array, sharedSecret: Uint8Array, kem: HpkeKem, kdf: HpkeKdf, aead: HpkeAead, info: Uint8Array): Promise<HpkeContext>;
/**
 * Creates HPKE sender context according to `KeySchedule` as defined in
 * @see https://www.rfc-editor.org/rfc/rfc9180.html#section-5.1-9.
 */
export declare function createSenderContext(recipientPublicKey: Uint8Array, kem: HpkeKem, kdf: HpkeKdf, aead: HpkeAead, info: Uint8Array): Promise<HpkeContext>;
/**
 * Creates HPKE recipient context according to `KeySchedule` as defined in
 * @see https://www.rfc-editor.org/rfc/rfc9180.html#section-5.1-9.
 */
export declare function createRecipientContext(encapsulatedKey: Uint8Array, recipientPrivateKey: NistCurvesHpkeKemPrivateKey, kem: HpkeKem, kdf: HpkeKdf, aead: HpkeAead, info: Uint8Array): Promise<HpkeContext>;