COTP

This module is part of a chain of OTP libraries all written in different languages. See https://github.com/OTPLibraries

A simple One Time Password (OTP) library in C/C++

Fully ompatible with Authy and Google Authenticator. Full support for QR code url is provided.

Libraries Needed

In order to utilize this library, you may want the following libraries:

OpenSSL (-lcrypto) is recommended. There is a test file which has all that mess already sorted out for you.

Configuration

This library works with C++, but is targeted at C. I made a .hpp header that wraps the C functions, which I find gross. Feel free to clean it up and do a pull request. I do, however, have to recommend you use the .hpp header due to namespace flooding.

License

This library is licensed under MIT.

This product includes software developed by the OpenSSL Project for use in the OpenSSL Toolkit. (http://www.openssl.org/)

Usage

The library allows you to create a function in a specified format to communicate with the OTP generation. You will have to manually do the cryptographic functions and time function for TOTP, which is easy in OpenSSL; I suggest it just for that. See the test file for pre-made functions that will hook you up.

Create OTPData with the required information using otp_new().
You need to memset any buffer you give to the library to get information or calloc everything.
Invoke functions you need and pass said OTPData.

Building

The examples use OpenSSL with -lcrypto for cryptographic functions.

See the test/build.bat file for guidance. It is simply compiling all the CUs as C. If you don't want to use the .hpp C++ wrapper, you can extern "C" #include "cotp.h" which will flood your global space with the header file contents.

TODO

SHA256 needs verified if its working fully
SHA512 needs verified if its working fully