1 files changed, 22 insertions, 0 deletions
diff --git a/src/engine/def_engine/def_powm.cpp b/src/engine/def_engine/def_powm.cpp
new file mode 100644
index 000000000..38aca901c
--- /dev/null
+++ b/src/engine/def_engine/def_powm.cpp
@@ -0,0 +1,22 @@
+/*************************************************
+* Modular Exponentiation Source File             *
+* (C) 1999-2007 Jack Lloyd                       *
+*************************************************/
+
+#include <botan/def_eng.h>
+#include <botan/def_powm.h>
+
+namespace Botan {
+
+/*************************************************
+* Choose a modular exponentation algorithm       *
+*************************************************/
+Modular_Exponentiator*
+Default_Engine::mod_exp(const BigInt& n, Power_Mod::Usage_Hints hints) const
+   {
+   if(n.is_odd())
+      return new Montgomery_Exponentiator(n, hints);
+   return new Fixed_Window_Exponentiator(n, hints);
+   }
+
+}