#include "os.h"#include <mp.h>// use extended gcd to find the multiplicative inverse// res = b**-1 mod mvoidmpinvert(mpint *b, mpint *m, mpint *res){ mpint *v; v = mpnew(0); mpextendedgcd(b, m, v, res, nil); if(mpcmp(v, mpone) != 0) abort(); mpfree(v); mpmod(res, m, res);}
#include "os.h"
#include <mp.h>
// use extended gcd to find the multiplicative inverse
// res = b**-1 mod m
void
mpinvert(mpint *b, mpint *m, mpint *res)
{
mpint *v;
v = mpnew(0);
mpextendedgcd(b, m, v, res, nil);
if(mpcmp(v, mpone) != 0)
abort();
mpfree(v);
mpmod(res, m, res);
}