import type { b64string } from '@tanker/crypto';
export declare const USER_SECRET_SIZE = 32;
export declare function createUserSecretBinary(trustchainId: b64string, userId: string): Uint8Array;
export declare function createUserSecretB64(trustchainId: b64string, userId: string): b64string;
export declare function assertUserSecret(userId: Uint8Array, secret: Uint8Array): void;