65 lines
1.3 KiB
C
65 lines
1.3 KiB
C
#include "tommath_private.h"
|
|
#ifdef BN_MP_COPY_C
|
|
/* LibTomMath, multiple-precision integer library -- Tom St Denis
|
|
*
|
|
* LibTomMath is a library that provides multiple-precision
|
|
* integer arithmetic as well as number theoretic functionality.
|
|
*
|
|
* The library was designed directly after the MPI library by
|
|
* Michael Fromberger but has been written from scratch with
|
|
* additional optimizations in place.
|
|
*
|
|
* SPDX-License-Identifier: Unlicense
|
|
*/
|
|
|
|
/* copy, b = a */
|
|
int mp_copy(const mp_int *a, mp_int *b)
|
|
{
|
|
int res, n;
|
|
|
|
/* if dst == src do nothing */
|
|
if (a == b) {
|
|
return MP_OKAY;
|
|
}
|
|
|
|
/* grow dest */
|
|
if (b->alloc < a->used) {
|
|
if ((res = mp_grow(b, a->used)) != MP_OKAY) {
|
|
return res;
|
|
}
|
|
}
|
|
|
|
/* zero b and copy the parameters over */
|
|
{
|
|
mp_digit *tmpa, *tmpb;
|
|
|
|
/* pointer aliases */
|
|
|
|
/* source */
|
|
tmpa = a->dp;
|
|
|
|
/* destination */
|
|
tmpb = b->dp;
|
|
|
|
/* copy all the digits */
|
|
for (n = 0; n < a->used; n++) {
|
|
*tmpb++ = *tmpa++;
|
|
}
|
|
|
|
/* clear high digits */
|
|
for (; n < b->used; n++) {
|
|
*tmpb++ = 0;
|
|
}
|
|
}
|
|
|
|
/* copy used count and sign */
|
|
b->used = a->used;
|
|
b->sign = a->sign;
|
|
return MP_OKAY;
|
|
}
|
|
#endif
|
|
|
|
/* ref: $Format:%D$ */
|
|
/* git commit: $Format:%H$ */
|
|
/* commit time: $Format:%ai$ */
|