3 /* LibTomMath, multiple-precision integer library -- Tom St Denis
5 * LibTomMath is a library that provides multiple-precision
6 * integer arithmetic as well as number theoretic functionality.
8 * The library was designed directly after the MPI library by
9 * Michael Fromberger but has been written from scratch with
10 * additional optimizations in place.
12 * The library is free for all purposes without any express
15 * Tom St Denis, tomstdenis@iahu.ca, http://math.libtomcrypt.org
20 mp_copy (mp_int * a, mp_int * b)
24 /* if dst == src do nothing */
30 if (b->alloc < a->used) {
31 if ((res = mp_grow (b, a->used)) != MP_OKAY) {
36 /* zero b and copy the parameters over */
38 register mp_digit *tmpa, *tmpb;
48 /* copy all the digits */
49 for (n = 0; n < a->used; n++) {
53 /* clear high digits */
54 for (; n < b->used; n++) {
59 /* copy used count and sign */