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diff --git a/libs/libtommath/bn_mp_mulmod.c b/libs/libtommath/bn_mp_mulmod.c
new file mode 100644
index 0000000..46818b6
--- /dev/null
+++ b/libs/libtommath/bn_mp_mulmod.c
@@ -0,0 +1,40 @@
+#include <tommath.h>
+#ifdef BN_MP_MULMOD_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://math.libtomcrypt.com
+ */
+
+/* d = a * b (mod c) */
+int mp_mulmod (mp_int * a, mp_int * b, mp_int * c, mp_int * d)
+{
+  int     res;
+  mp_int  t;
+
+  if ((res = mp_init (&t)) != MP_OKAY) {
+    return res;
+  }
+
+  if ((res = mp_mul (a, b, &t)) != MP_OKAY) {
+    mp_clear (&t);
+    return res;
+  }
+  res = mp_mod (&t, c, d);
+  mp_clear (&t);
+  return res;
+}
+#endif
+
+/* $Source: /cvs/libtom/libtommath/bn_mp_mulmod.c,v $ */
+/* $Revision: 1.4 $ */
+/* $Date: 2006/03/31 14:18:44 $ */