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/*************************************************
* GMP Engine Source File *
* (C) 1999-2007 Jack Lloyd *
*************************************************/
#include <botan/eng_gmp.h>
#include <botan/gmp_wrap.h>
#include <gmp.h>
namespace Botan {
#if defined(BOTAN_HAS_DIFFIE_HELLMAN)
namespace {
/*************************************************
* GMP DH Operation *
*************************************************/
class GMP_DH_Op : public DH_Operation
{
public:
BigInt agree(const BigInt& i) const;
DH_Operation* clone() const { return new GMP_DH_Op(*this); }
GMP_DH_Op(const DL_Group& group, const BigInt& x_bn) :
x(x_bn), p(group.get_p()) {}
private:
GMP_MPZ x, p;
};
/*************************************************
* GMP DH Key Agreement Operation *
*************************************************/
BigInt GMP_DH_Op::agree(const BigInt& i_bn) const
{
GMP_MPZ i(i_bn);
mpz_powm(i.value, i.value, x.value, p.value);
return i.to_bigint();
}
}
/*************************************************
* Acquire a DH op *
*************************************************/
DH_Operation* GMP_Engine::dh_op(const DL_Group& group, const BigInt& x) const
{
return new GMP_DH_Op(group, x);
}
#endif
}
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