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/* dh.cpp
*
* 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.cpp implements Diffie-Hellman support
*/
#include "runtime.hpp"
#include "dh.hpp"
#include "asn.hpp"
namespace TaoCrypt {
// Generate a DH Key Pair
void DH::GenerateKeyPair(RandomNumberGenerator& rng, byte* priv, byte* pub)
{
GeneratePrivate(rng, priv);
GeneratePublic(priv, pub);
}
// Generate private value
void DH::GeneratePrivate(RandomNumberGenerator& rng, byte* priv)
{
Integer x(rng, Integer::One(), p_ - 1);
x.Encode(priv, p_.ByteCount());
}
// Generate public value
void DH::GeneratePublic(const byte* priv, byte* pub)
{
const word32 bc(p_.ByteCount());
Integer x(priv, bc);
Integer y(a_exp_b_mod_c(g_, x, p_));
y.Encode(pub, bc);
}
// Generate Agreement
void DH::Agree(byte* agree, const byte* priv, const byte* otherPub)
{
const word32 bc(p_.ByteCount());
Integer x(priv, bc);
Integer y(otherPub, bc);
Integer z(a_exp_b_mod_c(y, x, p_));
z.Encode(agree, bc);
}
DH::DH(Source& source)
{
Initialize(source);
}
void DH::Initialize(Source& source)
{
DH_Decoder decoder(source);
decoder.Decode(*this);
}
} // namespace
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