/// <reference types="node" />
import { MasterKeyValue } from './walletdb/masterKeyValue';
/**
 * A Master Key implementation for XChaCha20Poly1305. This class can be used
 * to derive child keys deterministically given the child key's salt and nonces.
 *
 * This master key does not automatically lock or unlock. You must call those
 * explicitly if you would like any default timeout behavior.
 */
export declare class MasterKey {
    private mutex;
    private locked;
    readonly salt: Buffer;
    readonly nonce: Buffer;
    private masterKey;
    constructor(masterKeyValue: MasterKeyValue);
    static generate(passphrase: string): MasterKey;
    lock(): Promise<void>;
    unlock(passphrase: string): Promise<void>;
    destroy(): Promise<void>;
    encrypt(plaintext: Buffer): {
        ciphertext: Buffer;
        salt: Buffer;
        nonce: Buffer;
    };
    decrypt(ciphertext: Buffer, salt: Buffer, nonce: Buffer): Buffer;
}
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