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A comprehensive Node.js package that simplifies the implementation of One-Time Password (OTP).

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Build & test npm

Time2fa

A comprehensive Node.js package that simplifies the implementation of One-Time Password (OTP) authentication using HMAC-based One-Time Password (HOTP) and Time-based One-Time Password (TOTP) algorithms.

Features

  • Support both HOTP and TOTP algorithms
  • Easy-to-use API for generating and verifying OTPs
  • Customizable OTP length, counters and time window
  • Supports various hashing algorithms (SHA-1, SHA-256, SHA-512)
  • Compatible with popular OTP generators like Google Authenticator and Authy

Installation

Install the package using NPM:

npm i --save time2fa

Usage/Examples

TOTP

Generate key

// Import Totp
import { Totp } from "time2fa";

const key = Totp.generateKey({ issuer: "N0C", user: "johndoe@n0c.com" });

console.log(key);

// GenerateKey {
//   issuer: 'N0C',
//   user: 'johndoe@n0c.com',
//   config: { algo: 'sha1', digits: 6, period: 30, secretSize: 10 },
//   secret: 'ABCDEFGHIJKLMN12',
//   url: 'otpauth://totp/N0C:johndoe%40n0c.com?issuer=N0C&period=30&secret=ABCDEFGHIJKLMN12'
// }

Validate passcode

// Import Totp
import { Totp } from "time2fa";

const valid = Totp.validate({ passcode: "123456", secret: "ABCDEFGHIJKLMN12" });

console.log(valid);

// true || false

Generate passcodes

// Import Totp, and generateConfig for default configuration
import { Totp, generateConfig } from "time2fa";

const config = generateConfig();
const codes = Totp.generatePasscodes({ secret: "ABCDEFGHIJKLMN12" }, config);

console.log(codes);

// [ 123456 ]

QRCode generation

You must use an external library. For the example below we use qrcode.

// Import Totp and qrcode
import { Totp } from "time2fa";
import * as qrcode from "qrcode";

const key = Totp.generateKey({ issuer: "N0C", user: "johndoe@n0c.com" });

console.log(key);

// GenerateKey {
//   issuer: 'N0C',
//   user: 'johndoe@n0c.com',
//   config: { algo: 'sha1', digits: 6, period: 30, secretSize: 10 },
//   secret: 'ABCDEFGHIJKLMN12',
//   url: 'otpauth://totp/N0C:johndoe%40n0c.com?issuer=N0C&period=30&secret=ABCDEFGHIJKLMN12'
// }

qrcode.toDataURL(key.url, (err, url) => {
  console.log(url); // Returns a Data URI containing a representation of the QR Code image.
});

HOTP

Generate Passcode

// Import Hotp, and generateConfig for default configuration and generateSecret
import { Hotp, generateConfig, generateSecret } from "time2fa";

const config = generateConfig();
const secret = generateSecret();

const code = Hotp.generatePasscode({ secret, counter: 1 }, config);

console.log(code);

// 123456

Validate passcode

// Import Hotp
import { Hotp } from "time2fa";

const valid = Hotp.validate({
  passcode: "123456",
  secret: "ABCDEFGHIJKLMN12",
  counter: 1,
});

console.log(valid);

// true || false

Helpers

generateConfig()

Generate default configuration

// Import generateConfig
import { generateConfig } from "time2fa";

const config = generateConfig();

console.log(config);

// { algo: 'sha1', digits: 6, period: 30, secretSize: 10 }

generateSecret()

Only support base32 at the moment

// Import generateSecret
import { generateSecret } from "time2fa";

const secret = generateSecret();

console.log(secret);

// ABCDEFGHIJKLMN12

generateUrl()

// Import generateSecret
import { generateUrl } from "time2fa";

const url = generateUrl({
  issuer: "N0C",
  user: "johndoe@n0c.com",
  secret: "ABCDEFGHIJKLMN12",
});

console.log(url);

// otpauth://totp/N0C:johndoe%40n0c.com?issuer=N0C&period=30&secret=ABCDEFGHIJKLMN12

generateBackupCodes()

Backup code should only be used once

// Import generateBackupCodes
import { generateBackupCodes } from "time2fa";

const backupCodes = generateBackupCodes();

console.log(backupCodes);

// [
//   '810550', '236884',
//   '979342', '815504',
//   '835313', '529942',
//   '263100', '882025',
//   '204896', '516248'
// ]

Documentation

Functions

Helpers

generateConfig(config?: TotpConfig): ValidTotpConfig

generateSecret(secretSize: number = DEFAULT_TOTP_SECRET_SIZE): string

generateBackupCodes(numCodes = 10, codeLength = DEFAULT_TOTP_DIGITS): string[]

generateUrl(options: UrlOptions, config: ValidTotpConfig): string

Totp

Totp.generateKey(options: TotpOptions, config?: TotpConfig): GenerateKey

Totp.generatePasscodes(options: TotpCode, config: ValidTotpConfig): string[]

Totp.validate(options: TotpValidateOptions, config?: TotpConfig): boolean

Hotp

Hotp.generatePasscode(options: HotpCode, config: ValidTotpConfig): string

Hotp.validate(options: HotpValidateOptions, config?: TotpConfig): boolean

Interfaces / Parameters

TotpConfig

Parameter Type default Description
secretSize number 10 Optional - Secret size
period number 30 Optional - Period of time
digits number 6 Optional- Code length
algo Algorithms sha1 Optional - 'sha1' | 'sha256' | 'sha512'

ValidTotpConfig

Parameter Type default Description
secretSize number - Required - Secret size
period number - Required - Period of time
digits number - Required- Code length
algo Algorithms - Required - 'sha1' | 'sha256' | 'sha512'

TotpOptions

Parameter Type default Description
issuer string - Required - Issuer name
user string - Required - Username

UrlOptions

Parameter Type default Description
issuer string - Required - Issuer name
user string - Required - Username
secret string - Required - Secret

TotpCode

Parameter Type default Description
secret string - Required - Secret
drift number 0 Optional - Time tolerance

TotpValidateOptions

Parameter Type default Description
passcode string - Required - The passcode to validate
secret string - Required - Secret
drift number 0 Optional - Time tolerance

HotpCode

Parameter Type default Description
secret string - Required - Secret
counter number - Required - Custom counter value

HotpValidateOptions

Parameter Type default Description
passcode string - Required - The passcode to validate
secret string - Required - Secret
counter number - Required - Custom counter value

Contributing

All PR's are welcome!

Running Tests

To run tests, run the following command

npm run test

License

MIT