#include <gmp.h>
int main(int argc, char**argv)
{
    if (argc!=4) {
        fprintf(stderr, "Usage: calcpq <pubexp> <privexp> <pubmod>\n");
        fprintf(stderr, "   numbers can be specified decimal, or 0xHEX\n");
    }
    mpz_t pubexp; parsenum(pubexp, argv[1]);
    mpz_t privexp; parsenum(privexp, argv[2]);
    mpz_t pubmod; parsenum(pubmod, argv[3]);
// pubexp*privexp + b * (p-1)*(q-1) = 1
    // calc   pubexp*privexp-1
    mpz_t x;  mpz_init(x);
    mpz_set_ui(x, -1);
    mpz_addmul(x,pubexp,privexp);

    // todo: factor
    //
    // todo: iterate over factor combinations, b, x, y
    //    until (x+1)*(y+1) == pubmod
}