bn_mp_shrink.c 977 Bytes
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#include "tommath_private.h"
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#ifdef BN_MP_SHRINK_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.
 *
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 * SPDX-License-Identifier: Unlicense
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 */

/* shrink a bignum */
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int mp_shrink(mp_int *a)
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{
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   mp_digit *tmp;
   int used = 1;

   if (a->used > 0) {
      used = a->used;
   }

   if (a->alloc != used) {
      if ((tmp = OPT_CAST(mp_digit) XREALLOC(a->dp, sizeof(mp_digit) * (size_t)used)) == NULL) {
         return MP_MEM;
      }
      a->dp    = tmp;
      a->alloc = used;
   }
   return MP_OKAY;
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}
#endif

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/* ref:         HEAD -> master, tag: v1.1.0 */
/* git commit:  08549ad6bc8b0cede0b357a9c341c5c6473a9c55 */
/* commit time: 2019-01-28 20:32:32 +0100 */