--- a/libtommath/bn_mp_init_size.c	Wed Feb 28 22:11:39 2018 +0800
+++ b/libtommath/bn_mp_init_size.c	Thu Oct 15 19:55:15 2020 +0800
@@ -1,48 +1,24 @@
-#include <tommath_private.h>
+#include "tommath_private.h"
 #ifdef BN_MP_INIT_SIZE_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.
- *
- * The library is free for all purposes without any express
- * guarantee it works.
- *
- * Tom St Denis, [email protected], http://libtom.org
- */
+/* LibTomMath, multiple-precision integer library -- Tom St Denis */
+/* SPDX-License-Identifier: Unlicense */
 
 /* init an mp_init for a given size */
-int mp_init_size (mp_int * a, int size)
+mp_err mp_init_size(mp_int *a, int size)
 {
-  int x;
+   size = MP_MAX(MP_MIN_PREC, size);
 
-  /* pad size so there are always extra digits */
-  size += (MP_PREC * 2) - (size % MP_PREC);	
-  
-  /* alloc mem */
-  a->dp = OPT_CAST(mp_digit) XMALLOC (sizeof (mp_digit) * size);
-  if (a->dp == NULL) {
-    return MP_MEM;
-  }
+   /* alloc mem */
+   a->dp = (mp_digit *) MP_CALLOC((size_t)size, sizeof(mp_digit));
+   if (a->dp == NULL) {
+      return MP_MEM;
+   }
 
-  /* set the members */
-  a->used  = 0;
-  a->alloc = size;
-  a->sign  = MP_ZPOS;
+   /* set the members */
+   a->used  = 0;
+   a->alloc = size;
+   a->sign  = MP_ZPOS;
 
-  /* zero the digits */
-  for (x = 0; x < size; x++) {
-      a->dp[x] = 0;
-  }
-
-  return MP_OKAY;
+   return MP_OKAY;
 }
 #endif
-
-/* ref:         $Format:%D$ */
-/* git commit:  $Format:%H$ */
-/* commit time: $Format:%ai$ */