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/* dh.hpp
*
* Copyright (C) 2003 Sawtooth Consulting Ltd.
*
* This file is part of yaSSL.
*
* yaSSL is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* yaSSL is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/
/* dh.hpp provides Diffie-Hellman support
*/
#ifndef TAO_CRYPT_DH_HPP
#define TAO_CRYPT_DH_HPP
#include "misc.hpp"
#include "integer.hpp"
namespace TaoCrypt {
class Source;
// Diffie-Hellman
class DH {
public:
DH() {}
DH(Integer& p, Integer& g) : p_(p), g_(g) {}
explicit DH(Source&);
DH(const DH& that) : p_(that.p_), g_(that.g_) {}
DH& operator=(const DH& that)
{
DH tmp(that);
Swap(tmp);
return *this;
}
void Swap(DH& other)
{
p_.Swap(other.p_);
g_.Swap(other.g_);
}
void Initialize(Source&);
void Initialize(Integer& p, Integer& g)
{
SetP(p);
SetG(g);
}
void GenerateKeyPair(RandomNumberGenerator&, byte*, byte*);
void Agree(byte*, const byte*, const byte*);
void SetP(const Integer& p) { p_ = p; }
void SetG(const Integer& g) { g_ = g; }
Integer& GetP() { return p_; }
Integer& GetG() { return g_; }
// for p and agree
word32 GetByteLength() const { return p_.ByteCount(); }
private:
// group parms
Integer p_;
Integer g_;
void GeneratePrivate(RandomNumberGenerator&, byte*);
void GeneratePublic(const byte*, byte*);
};
} // namespace
#endif // TAO_CRYPT_DH_HPP
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