--- a/libtommath/bn_mp_clear.c	Wed Feb 28 22:11:39 2018 +0800
+++ b/libtommath/bn_mp_clear.c	Thu Oct 15 19:55:15 2020 +0800
@@ -1,41 +1,20 @@
-#include <tommath_private.h>
-#include "dbhelpers.h"
+#include "tommath_private.h"
 #ifdef BN_MP_CLEAR_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 */
 
 /* clear one (frees)  */
-void
-mp_clear (mp_int * a)
+void mp_clear(mp_int *a)
 {
-  /* only do anything if a hasn't been freed previously */
-  if (a->dp != NULL) {
-    /* first zero the digits */
-	m_burn(a->dp, a->alloc * sizeof(*a->dp));
+   /* only do anything if a hasn't been freed previously */
+   if (a->dp != NULL) {
+      /* free ram */
+      MP_FREE_DIGITS(a->dp, a->alloc);
 
-    /* free ram */
-    XFREE(a->dp);
-
-    /* reset members to make debugging easier */
-    a->dp    = NULL;
-    a->alloc = a->used = 0;
-    a->sign  = MP_ZPOS;
-  }
+      /* reset members to make debugging easier */
+      a->dp    = NULL;
+      a->alloc = a->used = 0;
+      a->sign  = MP_ZPOS;
+   }
 }
 #endif
-
-/* ref:         $Format:%D$ */
-/* git commit:  $Format:%H$ */
-/* commit time: $Format:%ai$ */