Simple OTP

Time-based and HMAC-based One-Time Password libraryfor node.js

• About
• Installation
• Usage
  • HOTP
    • Example
    • Configuration
  • TOTP
    • Example
    • Configuration
• Test
• References
• License

About

simpleotp is a simple :-) OTP library for node.js.

It provides an implementation of both rfc 4226 (HOTP) and rfc 6238 (TOTP).

Installation

npm install --save simpleotp

Usage

HOTP

Example

const otp = require('simpleotp');
const hotp = new otp.Hotp();

// generate a token
const token = hotp.createToken({secret:'12345678901234567890',counter:7});

// validate the token
const data = {token: token, secret:'12345678901234567890',counter: 7};
const valid = hotp.validate(data); //true

Configuration

Constructor options

Option	Value	Description	Default Value
algorithm	sha1,sha256,sha512	Algorithm to use	sha1
num_digits	integer	token length	6
encoding	ascii	Encoding of the secret	ascii

Create Token options

Option	Mandatory	Value	Description	Default value
secret	y	string type	Share secret to use	N/A
counter	y	integer type	The counter seed	N/A
algorithm	n	'sha1','sha256' or 'sha512'	Algorithm to use	sha1
num_digits	n	integer type	token length	6
encoding	n	'ascii'	Encoding of the secret	ascii

Validate token options

Option	Mandatory	Value	Description	Default value
token	y	string type	The original token	N/A
secret	y	string type	Share secret to use	N/A
counter	y	integer type	The counter seed	N/A
algorithm	n	'sha1','sha256' or 'sha512'	Algorithm to use	sha1
num_digits	n	integer type	token length	6
encoding	n	'ascii'	Encoding of the secret	ascii

TOTP

Example

const otp = require('simpleotp');
const totp = new otp.Totp();

// generate the token
const token = totp.createToken({secret:'12345678901234567890',seconds :Date.now()/1000});

// validate the token
const data = {token: token, secret:'12345678901234567890',seconds :Date.now()/1000}
const valid = totp.validate(data)
console.log(valid); // true

Configuration

Constructor options

Option	Value	Description	Default value
algorithm	'sha1','sha256' or 'sha512'	Algorithm to use	sha1
num_digits	integer	token length	6
encoding	ascii	Encoding of the secret	ascii
step	integer	Number of the second the token is valid	30

Create Token options

Option	Mandatory	Value	Description	Default value
secret	y	string type	Share secret to use	N/A
seconds	y	integer	time in seconds as counter	Date.now()/1000
step	n	integer	Number of the second the token is valid	30
algorithm	n	'sha1','sha256' or 'sha512'	Algorithm to use	sha1
num_digits	n	integer type	token length	6
encoding	n	'ascii'	Encoding of the secret	ascii

Validate token options

Option	Mandatory	Value	Description	Default value
token	y	string type	The original token	N/A
secret	y	string type	Share secret to use	N/A
seconds	Y	integer	time in seconds as counter	Date.now()/1000
step	n	integer	Number of the second the token is valid	30
algorithm	n	'sha1','sha256' or 'sha512'	Algorithm to use	sha1
num_digits	n	integer type	token length	8
encoding	n	'ascii'	Encoding of the secret	ascii

Tests

npm test

References

License

simpleotp is MIT licensed