/// <reference types="node" />
import { KeyObject } from 'crypto';
declare type KeyPair = {
    privateKey: KeyObject;
    publicKey: KeyObject;
};
declare type EncryptionContext = {
    nonce: Buffer;
    passphrase: Buffer;
};
declare type DecryptionContext = EncryptionContext & {
    authTag: Buffer;
};
export default class CryptoContext {
    _generateNonce(): Promise<Buffer>;
    _generateKeyPair(): Promise<KeyPair>;
    _generatePassphrase(nonce: Buffer): Promise<Buffer>;
    private _saveNonce;
    _savePrivateKey(privateKey: KeyObject, nonce: Buffer): Promise<void>;
    _savePassphrase(passphrase: Buffer, publicKey: KeyObject): Promise<void>;
    _saveAuthTag(authTag: Buffer): Promise<void>;
    _loadAuthTag(): Promise<Buffer>;
    private _loadNonce;
    _loadPrivateKey(nonce: Buffer): Promise<KeyObject>;
    _loadPassphrase(privateKey: KeyObject): Promise<Buffer>;
    _generateEncryptionKeys(): Promise<EncryptionContext>;
    _loadDecryptionKeys(): Promise<DecryptionContext>;
    private _createCipher;
    private _createDecipher;
    encrypt(data: Buffer): Promise<Buffer>;
    decrypt(data: Buffer): Promise<Buffer>;
}
export {};