@vates/otp
v1.1.0
Published
Minimal HTOP/TOTP implementation
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@vates/otp
Minimal HTOP/TOTP implementation
Install
Installation of the npm package:
npm install --save @vates/otp
Usage
Usual workflow
This section presents how this library should be used to implement a classic two factor authentification.
Setup
import { generateSecret, generateTotp } from '@vates/otp'
import QrCode from 'qrcode'
// Generates a secret that will be shared by both the service and the user:
const secret = generateSecret()
// Stores the secret in the service:
await currentUser.saveOtpSecret(secret)
// Generates an URI to present to the user
const uri = generateTotpUri({ secret })
// Generates the QR code from the URI to make it easily importable in Authy or Google Authenticator
const qr = await QrCode.toDataURL(uri)
Authentication
import { verifyTotp } from '@vates/otp'
// Verifies a `token` entered by the user against a `secret` generated during setup.
if (await verifyTotp(token, { secret })) {
console.log('authenticated!')
}
API
Secret
import { generateSecret } from '@vates/otp'
const secret = generateSecret()
// 'OJOKA65RY5FQQ2RYWVKD5Y3YG5CSHGYH'
HOTP
This is likely not what you want to use, see TOTP below instead.
import { generateHotp, generateHotpUri, verifyHotp } from '@vates/otp'
// a sequence number, see HOTP specification
const counter = 0
// generate a token
//
// optional params:
// - digits
const token = await generateHotp({ counter, secret })
// '239988'
// verify a token
//
// optional params:
// - digits
const isValid = await verifyHotp(token, { counter, secret })
// true
// generate a URI than can be displayed as a QR code to be used with Authy or Google Authenticator
//
// optional params:
// - digits
const uri = generateHotpUri({ counter, label: 'account name', issuer: 'my app', secret })
// 'otpauth://hotp/my%20app:account%20name?counter=0&issuer=my%20app&secret=OJOKA65RY5FQQ2RYWVKD5Y3YG5CSHGYH'
Optional params and their default values:
digits = 6
: length of the token, avoid using it because not compatible with Google Authenticator
TOTP
import { generateTotp, generateTotpUri, verifyTotp } from '@vates/otp'
// generate a token
//
// optional params:
// - digits
// - period
// - timestamp
const token = await generateTotp({ secret })
// '632869'
// verify a token
//
// optional params:
// - digits
// - period
// - timestamp
// - window
const isValid = await verifyTotp(token, { secret })
// true
// generate a URI than can be displayed as a QR code to be used with Authy or Google Authenticator
//
// optional params:
// - digits
// - period
const uri = generateTotpUri({ label: 'account name', issuer: 'my app', secret })
// 'otpauth://totp/my%20app:account%20name?issuer=my%20app&secret=OJOKA65RY5FQQ2RYWVKD5Y3YG5CSHGYH'
Optional params and their default values:
digits = 6
: length of the token, avoid using it because not compatible with Google Authenticatorperiod = 30
: number of seconds a token is validtimestamp = Date.now() / 1e3
: Unix timestamp, in seconds, when this token will be valid, default to nowwindow = 1
: number of periods before and aftertimestamp
for which the token is considered valid
Verification from URI
import { verifyFromUri } from '@vates/otp'
// Verify the token using all the information contained in the URI
const isValid = await verifyFromUri(token, uri)
// true
Contributions
Contributions are very welcomed, either on the documentation or on the code.
You may:
- report any issue you've encountered;
- fork and create a pull request.