Subversion Repositories planix.SVN

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

// convert a little endian byte array (least significant byte first) to an mpint
mpint*
letomp(uchar *s, uint n, mpint *b)
{
        int i=0, m = 0;
        mpdigit x=0;

        if(b == nil){
                b = mpnew(0);
                setmalloctag(b, getcallerpc(&s));
        }
        mpbits(b, 8*n);
        for(; n > 0; n--){
                x |= ((mpdigit)(*s++)) << i;
                i += 8;
                if(i == Dbits){
                        b->p[m++] = x;
                        i = 0;
                        x = 0;
                }
        }
        if(i > 0)
                b->p[m++] = x;
        b->top = m;
        b->sign = 1;
        return mpnorm(b);
}