export declare const fromString: (input: string) => Uint8Array;
export declare const fromHex: (hexString: string) => Uint8Array;
export declare const toHex: (bytes: Uint8Array) => string;
export declare const randomBytes: (len: number) => Uint8Array;
export declare function importSecretKey(rawKey: Uint8Array): PromiseLike<CryptoKey>;
