zolbooo / gtotp

TOTP generating with SHA-1-HMAC

gtotp

Simple to use library for generating TOTP

Usage

Just:

#include "totp.min.hpp"

And use functions:

std::string totp::generateSecret(std::string password);

Generating secret using init string or password and encodes it in base32

std::string totp::generateTOTP(std::string secret, int period = 30, int digits = 6);

Generate TOTP using existing secret, also you can define update period and number of digits

std::string totp::generateURL(std::string secret, std::string username, std::string issuer, std::string application = "");

Generate URL using data to make QR code and simplify scan on mobile devices

std::string totp::generateQR_URL(std::string secret, std::string username, std::string issuer, std::string application = "");

Generate QR code URL

int totp::time_until_new_period(int period);

Get time in seconds until new period

Compiling

Go to the gtotp folder and:

make

Copy libtotp.a to your folder and compile it with your project Also do not forget to install OpenSSL headers by installing libssl-dev package:

sudo apt-get install libssl-dev

And link your project with -lcrypto flag:

g++ test.cpp libtotp.a -o test -lcrypto