TOTP Generator

Generate time-based one time passcodes in the command line.

Followup to my rust based TOTP generator

Based on the RFC 6238 Standard

Usage

gcc -o totp main.c -lssl -lcrypto

./totp

You will be prompted to enter your secret key; This should be a base32 encoded key (the code that would normally be entered into Authy/ Google Auth App) from your chosen account.

If OpenSSL headers are missing:

# Ubuntu/Debian
sudo apt-get install libssl-dev

# macOS 
brew install openssl