https://github.com/khurozov/totp

Java implementation of TOTP
https://github.com/khurozov/totp

2fa google-authenticator java java-totp totp totp-codes totp-generator totp-java totp-library

Last synced: 13 days ago
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Java implementation of TOTP

• Host: GitHub
• URL: https://github.com/khurozov/totp
• Owner: khurozov
• License: mit
• Created: 2023-09-18T06:04:46.000Z (about 1 year ago)
• Default Branch: main
• Last Pushed: 2024-01-12T16:15:44.000Z (10 months ago)
• Last Synced: 2024-01-13T07:17:30.289Z (10 months ago)
• Topics: 2fa, google-authenticator, java, java-totp, totp, totp-codes, totp-generator, totp-java, totp-library
• Language: Java
• Homepage:
• Size: 23.4 KB
• Stars: 2
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
# Java implementation of TOTP

TOTP (Time-based One-Time Password) algorithm is extension of HOTP (HMAC-based One-Time Password) and additional info can be more about it [here](https://datatracker.ietf.org/doc/html/rfc6238).

 

## Installation

Add maven dependency to your project

```xml

    uz.khurozov

    totp

    1.0.2

```

## Defaults

- Algorithm: SHA1

- Digits: 6

- Period: 30 seconds

## Example

```java

import uz.khurozov.totp.*;

public class Demo {

    public static void main(String[] args) {

        // previously generated BASE32 secret

        String secret = "6GCM7ZFJJGEMHIWZSPQRXV2B66EO7PUS";

        System.out.println("secret: " + secret);

        // TOTP instance can be created for a secret once

        // and generate codes repeatedly

        TOTP totp = new TOTP(secret);

        for (int i = 0; i < 10; ++i) {

            System.out.println(totp.getCode());

            try {

                Thread.sleep(totp.getPeriod());

            } catch (InterruptedException e) {

                throw new RuntimeException(e);

            }

        }

    }

}

```

## NOTES

Checked with Google Authenticator app and worked correctly.

Feel free to report about issues or contribute.