1 files changed, 41 insertions, 0 deletions
diff --git a/src/pk/pubkey/dh_op.cpp b/src/pk/pubkey/dh_op.cpp
new file mode 100644
index 000000000..0bcfd4ef8
--- /dev/null
+++ b/src/pk/pubkey/dh_op.cpp
@@ -0,0 +1,41 @@
+/*************************************************
+* DH Operations Source File                      *
+* (C) 1999-2007 Jack Lloyd                       *
+*************************************************/
+
+#include <botan/eng_def.h>
+#include <botan/pow_mod.h>
+#include <botan/numthry.h>
+#include <botan/reducer.h>
+
+namespace Botan {
+
+namespace {
+
+/*************************************************
+* Default DH Operation                           *
+*************************************************/
+class Default_DH_Op : public DH_Operation
+   {
+   public:
+      BigInt agree(const BigInt& i) const { return powermod_x_p(i); }
+      DH_Operation* clone() const { return new Default_DH_Op(*this); }
+
+      Default_DH_Op(const DL_Group& group, const BigInt& x) :
+         powermod_x_p(x, group.get_p()) {}
+   private:
+      const Fixed_Exponent_Power_Mod powermod_x_p;
+   };
+
+}
+
+/*************************************************
+* Acquire a DH op                                *
+*************************************************/
+DH_Operation* Default_Engine::dh_op(const DL_Group& group,
+                                    const BigInt& x) const
+   {
+   return new Default_DH_Op(group, x);
+   }
+
+}