--- a/libtommath/bn_mp_init_size.c	Tue May 26 23:27:26 2020 +0800
+++ b/libtommath/bn_mp_init_size.c	Tue May 26 17:36:47 2020 +0200
@@ -1,27 +1,15 @@
 #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.
- *
- * SPDX-License-Identifier: Unlicense
- */
+/* 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;
-
-   /* pad size so there are always extra digits */
-   size += (MP_PREC * 2) - (size % MP_PREC);
+   size = MP_MAX(MP_MIN_PREC, size);
 
    /* alloc mem */
-   a->dp = OPT_CAST(mp_digit) XMALLOC(sizeof(mp_digit) * (size_t)size);
+   a->dp = (mp_digit *) MP_CALLOC((size_t)size, sizeof(mp_digit));
    if (a->dp == NULL) {
       return MP_MEM;
    }
@@ -31,15 +19,6 @@
    a->alloc = size;
    a->sign  = MP_ZPOS;
 
-   /* zero the digits */
-   for (x = 0; x < size; x++) {
-      a->dp[x] = 0;
-   }
-
    return MP_OKAY;
 }
 #endif
-
-/* ref:         HEAD -> master, tag: v1.1.0 */
-/* git commit:  08549ad6bc8b0cede0b357a9c341c5c6473a9c55 */
-/* commit time: 2019-01-28 20:32:32 +0100 */