OTP Generator

The OTP Generator creates and validates one-time passwords using HOTP and TOTP algorithms. It accepts a secret key and configuration parameters to reproduce codes for testing authentication flows in development, QA, and security assessments. The tool operates offline and adheres to RFC 4226 and RFC 6238, ensuring interoperability with standard MFA systems. By varying the secret, digits, and time-step, teams can simulate diverse enrollment and login scenarios without exposing real user credentials. This capability supports integration testing, incident response drills, and compliance audits where deterministic codes are required for reproducible results. The core value lies in deterministic, instrumented OTP generation that mirrors real-world MFA verifications while remaining isolated from production environments. Core features include support for Base32, hex, and ASCII secrets, selectable digits (6–8), and mode selection (HOTP or TOTP); optional hashing algorithms (SHA1/SHA256/SHA512) and time-step or counter inputs enable precise replication of server-side expectations. Security-conscious design emphasizes in-memory handling over persistence and avoidance of network calls during code generation. Use cases span onboarding new applications, validating MFA providers, and training staff to understand OTP validation logic. The tool is a specialized utility for developers, security engineers, and QA teams seeking reliable, repeatable OTP behavior for testing and verification.