4 /* operands need to have m->top+1 digits of space and satisfy 0 ≤ a ≤ m-1 */
6 modarg(mpint *a, mpint *m)
8 if(a->size <= m->top || a->sign < 0 || mpmagcmp(a, m) >= 0){
11 mpbits(a, Dbits*(m->top+1));
13 } else if(a->top < m->top){
14 memset(&a->p[a->top], 0, (m->top - a->top)*Dbytes);
20 mpmodadd(mpint *b1, mpint *b2, mpint *m, mpint *sum)
29 sum->flags |= (a->flags | b->flags) & MPtimesafe;
30 mpbits(sum, Dbits*2*(m->top+1));
32 mpvecadd(a->p, m->top, b->p, m->top, sum->p);
33 mpvecsub(sum->p, m->top+1, m->p, m->top, sum->p+m->top+1);
35 d = sum->p[2*m->top+1];
36 for(i = 0, j = m->top+1; i < m->top; i++, j++)
37 sum->p[i] = (sum->p[i] & d) | (sum->p[j] & ~d);
50 mpmodsub(mpint *b1, mpint *b2, mpint *m, mpint *diff)
59 diff->flags |= (a->flags | b->flags) & MPtimesafe;
60 mpbits(diff, Dbits*2*(m->top+1));
63 mpvecsub(a->p, m->top+1, b->p, m->top, diff->p);
64 mpvecadd(diff->p, m->top, m->p, m->top, diff->p+m->top+1);
67 for(i = 0, j = m->top+1; i < m->top; i++, j++)
68 diff->p[i] = (diff->p[i] & d) | (diff->p[j] & ~d);
81 mpmodmul(mpint *b1, mpint *b2, mpint *m, mpint *prod)