1 files changed, 30 insertions, 0 deletions
diff --git a/bn_mp_exch.c b/bn_mp_exch.c
new file mode 100644
index 0000000..0ef485a
--- /dev/null
+++ b/bn_mp_exch.c
@@ -0,0 +1,30 @@
+#include <tommath.h>
+#ifdef BN_MP_EXCH_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, tomstdenis@iahu.ca, http://math.libtomcrypt.org
+ */
+
+/* swap the elements of two integers, for cases where you can't simply swap the 
+ * mp_int pointers around
+ */
+void
+mp_exch (mp_int * a, mp_int * b)
+{
+  mp_int  t;
+
+  t  = *a;
+  *a = *b;
+  *b = t;
+}
+#endif