48 lines
900 B
C
48 lines
900 B
C
|
#include "tommath_private.h"
|
||
|
|
#ifdef BN_MP_COPY_C
|
||
|
|
/* LibTomMath, multiple-precision integer library -- Tom St Denis */
|
||
|
|
/* SPDX-License-Identifier: Unlicense */
|
||
|
|
|
||
|
|
/* copy, b = a */
|
||
|
|
mp_err mp_copy(const mp_int *a, mp_int *b)
|
||
|
|
{
|
||
|
|
int n;
|
||
|
|
mp_digit *tmpa, *tmpb;
|
||
|
|
mp_err err;
|
||
|
|
|
||
|
|
/* if dst == src do nothing */
|
||
|
|
if (a == b) {
|
||
|
|
return MP_OKAY;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* grow dest */
|
||
|
|
if (b->alloc < a->used) {
|
||
|
|
if ((err = mp_grow(b, a->used)) != MP_OKAY) {
|
||
|
|
return err;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/* zero b and copy the parameters over */
|
||
|
|
/* 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 */
|
||
|
|
MP_ZERO_DIGITS(tmpb, b->used - n);
|
||
|
|
|
||
|
|
/* copy used count and sign */
|
||
|
|
b->used = a->used;
|
||
|
|
b->sign = a->sign;
|
||
|
|
return MP_OKAY;
|
||
|
|
}
|
||
|
|
#endif
|