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/*
* DH Operations
* (C) 1999-2008 Jack Lloyd
*
* Distributed under the terms of the Botan license
*/
#ifndef BOTAN_DH_OPS_H__
#define BOTAN_DH_OPS_H__
#include <botan/dl_group.h>
#include <botan/reducer.h>
#include <botan/pow_mod.h>
namespace Botan {
/*
* DH Operation Interface
*/
class BOTAN_DLL DH_Operation
{
public:
virtual BigInt agree(const BigInt&) const = 0;
virtual DH_Operation* clone() const = 0;
virtual ~DH_Operation() {}
};
/*
* Botan's Default DH Operation
*/
class BOTAN_DLL 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:
Fixed_Exponent_Power_Mod powermod_x_p;
};
}
#endif
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