Subversion Repositories planix.SVN

#include "os.h"
#include <mp.h>
#include "dat.h"

/* return uniform random [0..n-1] */
mpint*
mpnrand(mpint *n, void (*gen)(uchar*, int), mpint *b)
{
        int bits;

        bits = mpsignif(n);
        if(bits == 0)
                abort();
        if(b == nil){
                b = mpnew(bits);
                setmalloctag(b, getcallerpc(&n));
        }
        do {
                mprand(bits, gen, b);
        } while(mpmagcmp(b, n) >= 0);

        return b;
}