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/*
* GMP IF Engine
* (C) 1999-2007 Jack Lloyd
*
* Distributed under the terms of the Botan license
*/
#include <botan/internal/gnump_engine.h>
#include <botan/internal/gmp_wrap.h>
#include <gmp.h>
namespace Botan {
#if defined(BOTAN_HAS_IF_PUBLIC_KEY_FAMILY)
namespace {
/*
* GMP IF Operation
*/
class GMP_IF_Op : public IF_Operation
{
public:
BigInt public_op(const BigInt&) const;
BigInt private_op(const BigInt&) const;
IF_Operation* clone() const { return new GMP_IF_Op(*this); }
GMP_IF_Op(const BigInt& e_bn, const BigInt& n_bn, const BigInt&,
const BigInt& p_bn, const BigInt& q_bn, const BigInt& d1_bn,
const BigInt& d2_bn, const BigInt& c_bn) :
e(e_bn), n(n_bn), p(p_bn), q(q_bn), d1(d1_bn), d2(d2_bn), c(c_bn) {}
private:
const GMP_MPZ e, n, p, q, d1, d2, c;
};
/*
* GMP IF Public Operation
*/
BigInt GMP_IF_Op::public_op(const BigInt& i_bn) const
{
GMP_MPZ i(i_bn);
mpz_powm(i.value, i.value, e.value, n.value);
return i.to_bigint();
}
/*
* GMP IF Private Operation
*/
BigInt GMP_IF_Op::private_op(const BigInt& i_bn) const
{
if(mpz_cmp_ui(p.value, 0) == 0)
throw Internal_Error("GMP_IF_Op::private_op: No private key");
GMP_MPZ j1, j2, h(i_bn);
mpz_powm(j1.value, h.value, d1.value, p.value);
mpz_powm(j2.value, h.value, d2.value, q.value);
mpz_sub(h.value, j1.value, j2.value);
mpz_mul(h.value, h.value, c.value);
mpz_mod(h.value, h.value, p.value);
mpz_mul(h.value, h.value, q.value);
mpz_add(h.value, h.value, j2.value);
return h.to_bigint();
}
}
/*
* Acquire an IF op
*/
IF_Operation* GMP_Engine::if_op(const BigInt& e, const BigInt& n,
const BigInt& d, const BigInt& p,
const BigInt& q, const BigInt& d1,
const BigInt& d2, const BigInt& c) const
{
return new GMP_IF_Op(e, n, d, p, q, d1, d2, c);
}
#endif
}
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