import { weierstrass } from '@noble/curves/abstract/weierstrass';
import { Field } from '@noble/curves/abstract/modular';
import { CHash } from '@noble/curves/abstract/utils';

const emptyHash: CHash = Object.assign(
  (_message: Uint8Array | string): Uint8Array => {
    return new Uint8Array(); // 返回一个空的 Uint8Array
  },
  {
    blockLen: 0,
    outputLen: 0,
    create: (_opts?: { dkLen?: number }): any => {
      return {};
    },
  }
);

// only use to convert key pair
export const sm2Curve = weierstrass({
  // sm2: short weierstrass.
  a: BigInt(
    '115792089210356248756420345214020892766250353991924191454421193933289684991996'
  ),
  b: BigInt(
    '18505919022281880113072981827955639221458448578012075254857346196103069175443'
  ),
  Fp: Field(
    BigInt(
      '115792089210356248756420345214020892766250353991924191454421193933289684991999'
    )
  ),
  h: BigInt(1),
  n: BigInt(
    '115792089210356248756420345214020892766061623724957744567843809356293439045923'
  ),
  Gx: BigInt(
    '22963146547237050559479531362550074578802567295341616970375194840604139615431'
  ),
  Gy: BigInt(
    '85132369209828568825618990617112496413088388631904505083283536607588877201568'
  ),
  hash: emptyHash,
  hmac: (_key: Uint8Array, ..._msgs: Uint8Array[]) => new Uint8Array(),
  randomBytes: (_bytesLength?: number) => new Uint8Array(),
});