get_client_secret.cxx

#include "includes.h"

using namespace CryptoPP;

static AutoSeededRandomPool rng_source;

#define DOCUMENTATION "Generates a single-use secret for blinding a message."
#define USEAGE "blsig_get_client_secret public_key.pem"
#define ARGUMENT_COUNT 1

static RSA::PublicKey public_key;

int main(int argc, char *argv[])
{
    if(ARGUMENT_COUNT != --argc){
        std::cerr << "Incorrect useage of " << argv[0]
            << ". Expected " << ARGUMENT_COUNT << " arguments; given " << argc << "." << std::endl
            << "Useage: \n\t" << USEAGE << std::endl
            << DOCUMENTATION << std::endl;
        return EXIT_FAILURE;
    }
	
    try{
        public_key = ReadPEMPublicKey(argv[1]);
    }
    catch(std::runtime_error& e)
    {
        std::cerr << e.what() << std::endl;
        return EXIT_FAILURE;
    }

    Integer client_secret = GenerateClientSecret(public_key, rng_source);
    
    std::cout << std::hex << client_secret << std::endl;
    return EXIT_SUCCESS;
}