1 files changed, 52 insertions, 0 deletions
diff --git a/botan/build/botan/elg_op.h b/botan/build/botan/elg_op.h
new file mode 100644
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+++ b/botan/build/botan/elg_op.h
@@ -0,0 +1,52 @@
+/*
+* ElGamal Operations
+* (C) 1999-2008 Jack Lloyd
+*
+* Distributed under the terms of the Botan license
+*/
+
+#ifndef BOTAN_ELGAMAL_OPS_H__
+#define BOTAN_ELGAMAL_OPS_H__
+
+#include <botan/pow_mod.h>
+#include <botan/numthry.h>
+#include <botan/reducer.h>
+#include <botan/dl_group.h>
+
+namespace Botan {
+
+/*
+* ElGamal Operation
+*/
+class BOTAN_DLL ELG_Operation
+   {
+   public:
+      virtual SecureVector<byte> encrypt(const byte[], u32bit,
+                                         const BigInt&) const = 0;
+      virtual BigInt decrypt(const BigInt&, const BigInt&) const = 0;
+      virtual ELG_Operation* clone() const = 0;
+      virtual ~ELG_Operation() {}
+   };
+
+/*
+* Botan's Default ElGamal Operation
+*/
+class BOTAN_DLL Default_ELG_Op : public ELG_Operation
+   {
+   public:
+      SecureVector<byte> encrypt(const byte[], u32bit, const BigInt&) const;
+      BigInt decrypt(const BigInt&, const BigInt&) const;
+
+      ELG_Operation* clone() const { return new Default_ELG_Op(*this); }
+
+      Default_ELG_Op(const DL_Group&, const BigInt&, const BigInt&);
+   private:
+      const BigInt p;
+      Fixed_Base_Power_Mod powermod_g_p, powermod_y_p;
+      Fixed_Exponent_Power_Mod powermod_x_p;
+      Modular_Reducer mod_p;
+   };
+
+}
+
+#endif