OTP Code Generator and Validator 🔐

Welcome to the OTP Code Generator and Validator repository! This project enables you to generate and validate time-based One-Time Passwords (OTPs) for multi-factor authentication (MFA). The purpose of this tool is to enhance security in various applications by providing a reliable method for user verification.

Table of Contents

• Features
• Installation
• Usage
• How It Works
• Example
• Contributing
• License
• Support

Features

• Time-Based OTP Generation: Create OTPs that are valid for a short period.
• Validation: Check the validity of generated OTPs.
• Secure: Utilizes HMAC (Hash-based Message Authentication Code) for security.
• Device Compatibility: Works on various devices and platforms.
• Easy Integration: Simple API for developers to use in their applications.

Installation

To get started with the OTP Code Generator and Validator, you need to clone this repository. Use the following command:

git clone https://github.com/HridoyG/otp-code-generator-and-validator.git

After cloning, navigate to the project directory:

cd otp-code-generator-and-validator

Dependencies

Make sure you have the necessary dependencies installed. You can use the following command to install them:

npm install

Usage

To generate and validate OTPs, you can follow the examples provided in the documentation. For detailed instructions, please refer to the examples section below.

Generate OTP

To generate a time-based OTP, use the following function:

const otp = generateOTP(secret);
console.log(`Your OTP is: ${otp}`);

Validate OTP

To validate an OTP, use the following function:

const isValid = validateOTP(secret, userInput);
console.log(`Is the OTP valid? ${isValid}`);

How It Works

The OTP generator uses the TOTP (Time-based One-Time Password) algorithm. This algorithm combines a shared secret key and the current time to produce a unique OTP. The OTP changes every 30 seconds, ensuring that even if an OTP is intercepted, it becomes useless after a short time.

1. Secret Key: A unique key shared between the server and the client.
2. Current Time: The current timestamp is divided into intervals (usually 30 seconds).
3. HMAC: The secret key and the current interval are combined using HMAC to produce the OTP.

This process ensures that each OTP is unique and time-sensitive, providing a secure method for user authentication.

Example

Here’s a simple example of how to generate and validate an OTP:

const secret = 'your-unique-secret-key';

// Generate OTP
const otp = generateOTP(secret);
console.log(`Generated OTP: ${otp}`);

// User input
const userInput = prompt('Enter the OTP: ');

// Validate OTP
const isValid = validateOTP(secret, userInput);
console.log(`Is the OTP valid? ${isValid}`);

This example demonstrates the basic functionality of the OTP generator and validator. You can expand on this by integrating it into your applications.

Contributing

We welcome contributions to improve the OTP Code Generator and Validator. If you would like to contribute, please follow these steps:

1. Fork the repository.
2. Create a new branch (git checkout -b feature/YourFeature).
3. Make your changes and commit them (git commit -m 'Add new feature').
4. Push to the branch (git push origin feature/YourFeature).
5. Create a pull request.

Please ensure that your code adheres to the existing style and includes appropriate tests.

License

This project is licensed under the MIT License. See the LICENSE file for details.

Support

For support, please check the Releases section for the latest updates and downloads. You can also raise issues or ask questions in the GitHub repository.

Conclusion

The OTP Code Generator and Validator is a simple yet effective tool for enhancing security in applications through multi-factor authentication. By following the instructions above, you can easily integrate OTP functionality into your projects.

Feel free to explore the repository and utilize the code as needed. For more details, visit the Releases section to download the latest version and get started.