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- #include "tommath_private.h"
- #ifdef BN_MP_GROW_C
- /* LibTomMath, multiple-precision integer library -- Tom St Denis */
- /* SPDX-License-Identifier: Unlicense */
- /* grow as required */
- mp_err mp_grow(mp_int *a, int size)
- {
- int i;
- mp_digit *tmp;
- /* if the alloc size is smaller alloc more ram */
- if (a->alloc < size) {
- /* reallocate the array a->dp
- *
- * We store the return in a temporary variable
- * in case the operation failed we don't want
- * to overwrite the dp member of a.
- */
- tmp = (mp_digit *) MP_REALLOC(a->dp,
- (size_t)a->alloc * sizeof(mp_digit),
- (size_t)size * sizeof(mp_digit));
- if (tmp == NULL) {
- /* reallocation failed but "a" is still valid [can be freed] */
- return MP_MEM;
- }
- /* reallocation succeeded so set a->dp */
- a->dp = tmp;
- /* zero excess digits */
- i = a->alloc;
- a->alloc = size;
- MP_ZERO_DIGITS(a->dp + i, a->alloc - i);
- }
- return MP_OKAY;
- }
- #endif
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