--- a/libtommath/bn_s_mp_sub.c	Sat Jun 24 17:50:50 2017 +0800
+++ b/libtommath/bn_s_mp_sub.c	Sat Jun 24 22:37:14 2017 +0800
@@ -1,4 +1,4 @@
-#include <tommath.h>
+#include <tommath_private.h>
 #ifdef BN_S_MP_SUB_C
 /* LibTomMath, multiple-precision integer library -- Tom St Denis
  *
@@ -12,7 +12,7 @@
  * The library is free for all purposes without any express
  * guarantee it works.
  *
- * Tom St Denis, [email protected], http://math.libtomcrypt.com
+ * Tom St Denis, [email protected], http://libtom.org
  */
 
 /* low level subtraction (assumes |a| > |b|), HAC pp.595 Algorithm 14.9 */
@@ -35,8 +35,8 @@
   c->used = max;
 
   {
-    register mp_digit u, *tmpa, *tmpb, *tmpc;
-    register int i;
+    mp_digit u, *tmpa, *tmpb, *tmpc;
+    int i;
 
     /* alias for digit pointers */
     tmpa = a->dp;
@@ -47,14 +47,14 @@
     u = 0;
     for (i = 0; i < min; i++) {
       /* T[i] = A[i] - B[i] - U */
-      *tmpc = *tmpa++ - *tmpb++ - u;
+      *tmpc = (*tmpa++ - *tmpb++) - u;
 
       /* U = carry bit of T[i]
        * Note this saves performing an AND operation since
        * if a carry does occur it will propagate all the way to the
        * MSB.  As a result a single shift is enough to get the carry
        */
-      u = *tmpc >> ((mp_digit)(CHAR_BIT * sizeof (mp_digit) - 1));
+      u = *tmpc >> ((mp_digit)((CHAR_BIT * sizeof(mp_digit)) - 1));
 
       /* Clear carry from T[i] */
       *tmpc++ &= MP_MASK;
@@ -66,7 +66,7 @@
       *tmpc = *tmpa++ - u;
 
       /* U = carry bit of T[i] */
-      u = *tmpc >> ((mp_digit)(CHAR_BIT * sizeof (mp_digit) - 1));
+      u = *tmpc >> ((mp_digit)((CHAR_BIT * sizeof(mp_digit)) - 1));
 
       /* Clear carry from T[i] */
       *tmpc++ &= MP_MASK;
@@ -84,6 +84,6 @@
 
 #endif
 
-/* $Source: /cvs/libtom/libtommath/bn_s_mp_sub.c,v $ */
-/* $Revision: 1.3 $ */
-/* $Date: 2006/03/31 14:18:44 $ */
+/* $Source$ */
+/* $Revision$ */
+/* $Date$ */