crowd-funder-for-time-pwa/src/libs/crypto/index.ts

import { IIdentifier } from "@veramo/core";
import { DEFAULT_DID_PROVIDER_NAME } from "../veramo/setup";
import { getRandomBytesSync } from "ethereum-cryptography/random";
import { entropyToMnemonic } from "ethereum-cryptography/bip39";
import { wordlist } from "ethereum-cryptography/bip39/wordlists/english";
import { HDNode } from "@ethersproject/hdnode";

/**
 *
 *
 * @param {string} address
 * @param {string} publicHex
 * @param {string} privateHex
 * @param {string} derivationPath
 * @return {*}  {Omit<IIdentifier, 'provider'>}
 */
export const newIdentifier = (
  address: string,
  publicHex: string,
  privateHex: string,
  derivationPath: string
): Omit<IIdentifier, keyof "provider"> => {
  return {
    did: DEFAULT_DID_PROVIDER_NAME + ":" + address,
    keys: [
      {
        kid: publicHex,
        kms: "local",
        meta: { derivationPath: derivationPath },
        privateKeyHex: privateHex,
        publicKeyHex: publicHex,
        type: "Secp256k1",
      },
    ],
    provider: DEFAULT_DID_PROVIDER_NAME,
    services: [],
  };
};

export const deriveAddress = (
  mnemonic: string
): [string, string, string, string] => {
  const UPORT_ROOT_DERIVATION_PATH = "m/7696500'/0'/0'/0'";
  mnemonic = mnemonic.trim().toLowerCase();

  const hdnode: HDNode = HDNode.fromMnemonic(mnemonic);
  const rootNode: HDNode = hdnode.derivePath(UPORT_ROOT_DERIVATION_PATH);
  const privateHex = rootNode.privateKey.substring(2); // original starts with '0x'
  const publicHex = rootNode.publicKey.substring(2); // original starts with '0x'
  const address = rootNode.address;

  return [address, privateHex, publicHex, UPORT_ROOT_DERIVATION_PATH];
};

/**
 *
 *
 * @return {*}  {string}
 */
export const createIdentifier = (): string => {
  const entropy: Uint8Array = getRandomBytesSync(32);
  const mnemonic = entropyToMnemonic(entropy, wordlist);

  return mnemonic;
};