otp-io/src/__tests__/hotp.test.ts

🕖 Typed library to work 2fa via Google Authenticator/Time-based TOTP/Hmac-based HOTP

import { HmacAlgorithm, SecretKey, HOTP } from "../index";
import { hmac } from "../crypto-node";
import { Buffer } from "buffer";

describe("HOTP/Reference", () => {
  // https://www.ietf.org/rfc/rfc4226.txt
  const secret = new SecretKey(Buffer.from("12345678901234567890", "ascii"));
  const hotp = new HOTP(hmac, {
    secret,
    algorithm: HmacAlgorithm.SHA1,
    digits: 6,
    counter: 0
  });

  function reference(counter: number, code: string) {
    test(`Counter: ${counter}`, async () => {
      const isValid = await hotp.checkCode(code, { counter });

      expect(isValid).toBeTruthy();
    });
  }

  const codes = [
    "755224",
    "287082",
    "359152",
    "969429",
    "338314",
    "254676",
    "287922",
    "162583",
    "399871",
    "520489"
  ];

  for (const [index, code] of codes.entries()) {
    reference(index, code);
  }

  test("Increment", () => {
    expect(hotp.options.counter).toBe(0);
    expect(hotp.increment()).toBe(1);
    expect(hotp.options.counter).toBe(1);
  });
});