1 files changed, 40 insertions, 0 deletions
diff --git a/src/libtommath/bn_mp_neg.c b/src/libtommath/bn_mp_neg.c
new file mode 100644
index 0000000..87a8b50
--- /dev/null
+++ b/src/libtommath/bn_mp_neg.c
@@ -0,0 +1,40 @@
+#include "tommath.h"
+#ifdef BN_MP_NEG_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@gmail.com, http://libtom.org
+ */
+
+/* b = -a */
+int mp_neg (mp_int * a, mp_int * b)
+{
+  int     res;
+  if (a != b) {
+     if ((res = mp_copy (a, b)) != MP_OKAY) {
+        return res;
+     }
+  }
+
+  if (mp_iszero(b) != MP_YES) {
+     b->sign = (a->sign == MP_ZPOS) ? MP_NEG : MP_ZPOS;
+  } else {
+     b->sign = MP_ZPOS;
+  }
+
+  return MP_OKAY;
+}
+#endif
+
+/* $Source: /cvs/libtom/libtommath/bn_mp_neg.c,v $ */
+/* $Revision: 1.4 $ */
+/* $Date: 2006/12/28 01:25:13 $ */