declare module 'gmsm-sm3js' {
  export function sumHex(data: Uint8Array): string;
  export function fromHex(hex: string): Uint8Array;
  export function create(): any;
  export function kdf(data: Uint8Array, len: number): Uint8Array;
  export function sum(data: Uint8Array): Uint8Array;
  export function toHex(bytes: Uint8Array): string;
  export function normalizeInput(input: string | Buffer | Uint8Array): Uint8Array;
  export function testSpeed(hashFn: Function, N: number, M: number): void;
}