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/*
* PK Algorithm Core
* (C) 1999-2007 Jack Lloyd
*
* Distributed under the terms of the Botan license
*/
#include <botan/dh_core.h>
#include <botan/numthry.h>
#include <botan/pk_engine.h>
#include <botan/parsing.h>
#include <algorithm>
namespace Botan {
namespace {
const u32bit BLINDING_BITS = BOTAN_PRIVATE_KEY_OP_BLINDING_BITS;
}
/*
* DH_Core Constructor
*/
DH_Core::DH_Core(RandomNumberGenerator& rng,
const DL_Group& group, const BigInt& x)
{
op = Engine_Core::dh_op(group, x);
const BigInt& p = group.get_p();
BigInt k(rng, std::min(p.bits()-1, BLINDING_BITS));
if(k != 0)
blinder = Blinder(k, power_mod(inverse_mod(k, p), x, p), p);
}
/*
* DH_Core Copy Constructor
*/
DH_Core::DH_Core(const DH_Core& core)
{
op = 0;
if(core.op)
op = core.op->clone();
blinder = core.blinder;
}
/*
* DH_Core Assignment Operator
*/
DH_Core& DH_Core::operator=(const DH_Core& core)
{
delete op;
if(core.op)
op = core.op->clone();
blinder = core.blinder;
return (*this);
}
/*
* DH Operation
*/
BigInt DH_Core::agree(const BigInt& i) const
{
return blinder.unblind(op->agree(blinder.blind(i)));
}
}
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