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/*
* 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
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