@mysten/sui/dist/esm/keypairs/ed25519/ed25519-hd-key.js

Sui TypeScript API(Work in Progress)

import { fromHEX } from "@mysten/bcs";
import { hmac } from "@noble/hashes/hmac";
import { sha512 } from "@noble/hashes/sha512";
import nacl from "tweetnacl";
const ED25519_CURVE = "ed25519 seed";
const HARDENED_OFFSET = 2147483648;
const pathRegex = new RegExp("^m(\\/[0-9]+')+$");
const replaceDerive = (val) => val.replace("'", "");
const getMasterKeyFromSeed = (seed) => {
  const h = hmac.create(sha512, ED25519_CURVE);
  const I = h.update(fromHEX(seed)).digest();
  const IL = I.slice(0, 32);
  const IR = I.slice(32);
  return {
    key: IL,
    chainCode: IR
  };
};
const CKDPriv = ({ key, chainCode }, index) => {
  const indexBuffer = new ArrayBuffer(4);
  const cv = new DataView(indexBuffer);
  cv.setUint32(0, index);
  const data = new Uint8Array(1 + key.length + indexBuffer.byteLength);
  data.set(new Uint8Array(1).fill(0));
  data.set(key, 1);
  data.set(new Uint8Array(indexBuffer, 0, indexBuffer.byteLength), key.length + 1);
  const I = hmac.create(sha512, chainCode).update(data).digest();
  const IL = I.slice(0, 32);
  const IR = I.slice(32);
  return {
    key: IL,
    chainCode: IR
  };
};
const getPublicKey = (privateKey, withZeroByte = true) => {
  const keyPair = nacl.sign.keyPair.fromSeed(privateKey);
  const signPk = keyPair.secretKey.subarray(32);
  const newArr = new Uint8Array(signPk.length + 1);
  newArr.set([0]);
  newArr.set(signPk, 1);
  return withZeroByte ? newArr : signPk;
};
const isValidPath = (path) => {
  if (!pathRegex.test(path)) {
    return false;
  }
  return !path.split("/").slice(1).map(replaceDerive).some(
    isNaN
    /* ts T_T*/
  );
};
const derivePath = (path, seed, offset = HARDENED_OFFSET) => {
  if (!isValidPath(path)) {
    throw new Error("Invalid derivation path");
  }
  const { key, chainCode } = getMasterKeyFromSeed(seed);
  const segments = path.split("/").slice(1).map(replaceDerive).map((el) => parseInt(el, 10));
  return segments.reduce((parentKeys, segment) => CKDPriv(parentKeys, segment + offset), {
    key,
    chainCode
  });
};
export {
  derivePath,
  getMasterKeyFromSeed,
  getPublicKey,
  isValidPath,
  pathRegex,
  replaceDerive
};
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