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/*
* OpenSSL Engine
* (C) 1999-2007 Jack Lloyd
*
* Distributed under the terms of the Botan license
*/
#include <botan/eng_ossl.h>
#include <botan/bn_wrap.h>
#include <openssl/opensslv.h>
#if OPENSSL_VERSION_NUMBER < 0x0090700F
#error Your OpenSSL install is too old, upgrade to 0.9.7 or later
#endif
namespace Botan {
#if defined(BOTAN_HAS_DIFFIE_HELLMAN)
namespace {
/*
* OpenSSL DH Operation
*/
class OpenSSL_DH_Op : public DH_Operation
{
public:
BigInt agree(const BigInt& i) const;
DH_Operation* clone() const { return new OpenSSL_DH_Op(*this); }
OpenSSL_DH_Op(const DL_Group& group, const BigInt& x_bn) :
x(x_bn), p(group.get_p()) {}
private:
OSSL_BN x, p;
OSSL_BN_CTX ctx;
};
/*
* OpenSSL DH Key Agreement Operation
*/
BigInt OpenSSL_DH_Op::agree(const BigInt& i_bn) const
{
OSSL_BN i(i_bn), r;
BN_mod_exp(r.value, i.value, x.value, p.value, ctx.value);
return r.to_bigint();
}
}
/*
* Acquire a DH op
*/
DH_Operation* OpenSSL_Engine::dh_op(const DL_Group& group,
const BigInt& x) const
{
return new OpenSSL_DH_Op(group, x);
}
#endif
}
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