OTP-Java
A lightweight Java library for generating and verifying HOTP and TOTP one-time passwords compliant with RFC 4226 and RFC 6238.
What is OTP-Java?
OTP-Java is a Java library for generating and verifying one-time passwords used in two-factor authentication systems. It implements both HMAC-based one-time passwords (HOTP) as defined in RFC 4226 and time-based one-time passwords (TOTP) as per RFC 6238. The library simplifies adding OTP functionality to Java applications with a clean, builder-based API.
Java developers building applications that require two-factor authentication, such as web services, APIs, or enterprise systems needing secure user login flows.
Developers choose OTP-Java for its minimal footprint, strict compliance with RFC standards, and ease of integration—offering a pure Java solution without external dependencies. Its support for OTPAuth URIs and flexible configuration makes it ideal for projects requiring reliable, standards-based OTP generation.
Overview
A small and easy-to-use one-time password generator library for Java implementing RFC 4226 (HOTP) and RFC 6238 (TOTP).
Use Cases
Best For
- Adding two-factor authentication to Java web applications
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