OTP Generator

OTP Generator is a Node.js package for generating and verifying one-time passwords (OTPs) with enhanced security and additional features.

Features

• Enhanced Security:

  • Support for a secret key for generating OTPs, adding an extra layer of security.
  • Hashing of generated OTPs using SHA-256 for secure storage.

• Improved Functionality:

  • Configurable OTP length.
  • Support for different character sets (numeric, alphanumeric) for OTPs.

• Additional Features:

  • Robust error handling with informative error messages.
  • Customizable OTP expiry time.

Installation

You can install the package via npm:

npm install otp-generator

Usage

const { generateOTP, verifyOTP } = require('otp-generator');

// Generate an OTP with default options const { otp, expiryTimestamp, hashedOTP } = generateOTP(); console.log('Generated OTP:', otp);

// Generate an OTP with custom options const options = { secretKey: 'mysecretkey', length: 8, charset: 'alphanumeric', expiryTime: 600 // 10 minutes }; const { otp, expiryTimestamp, hashedOTP } = generateOTP(options); console.log('Generated OTP:', otp);

// Verify an OTP const isValid = verifyOTP(otp, hashedOTP, expiryTimestamp, options.secretKey); console.log('OTP is valid:', isValid);

generateOTP(options)

Generates a new OTP with the specified options.

Options:

• secretKey (string, optional): The secret key for generating OTPs. Adds an extra layer of security.
• length (number, default: 6): The desired length of the OTP.
• charset (string, default: 'numeric'): The character set for the OTP. Can be 'numeric' or 'alphanumeric'.
• expiryTime (number, default: 300): The expiry time for the OTP in seconds.

Returns: An object containing the otp (string), expiryTimestamp (number), and hashedOTP (string).

verifyOTP(otp, hashedOTP, expiryTimestamp, secretKey)

Verifies the validity of an OTP.

Parameters:

• otp (string): The OTP to be verified.
• hashedOTP (string): The hashed value of the OTP for comparison.
• expiryTimestamp (number): The expiry timestamp of the OTP.
• secretKey (string, optional): The secret key used for generating the OTP.

Returns: true if the OTP is valid, false otherwise.

Contributing

Contributions are welcome! If you find any issues or have suggestions for improvements, please open an issue or submit a pull request.

License

This project is licensed under the MIT License.