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/*************************************************
* OpenSSL IF Engine Source File *
* (C) 1999-2007 Jack Lloyd *
*************************************************/
#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_IF_PUBLIC_KEY_FAMILY)
namespace {
/*************************************************
* OpenSSL IF Operation *
*************************************************/
class OpenSSL_IF_Op : public IF_Operation
{
public:
BigInt public_op(const BigInt&) const;
BigInt private_op(const BigInt&) const;
IF_Operation* clone() const { return new OpenSSL_IF_Op(*this); }
OpenSSL_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 OSSL_BN e, n, p, q, d1, d2, c;
OSSL_BN_CTX ctx;
};
/*************************************************
* OpenSSL IF Public Operation *
*************************************************/
BigInt OpenSSL_IF_Op::public_op(const BigInt& i_bn) const
{
OSSL_BN i(i_bn), r;
BN_mod_exp(r.value, i.value, e.value, n.value, ctx.value);
return r.to_bigint();
}
/*************************************************
* OpenSSL IF Private Operation *
*************************************************/
BigInt OpenSSL_IF_Op::private_op(const BigInt& i_bn) const
{
if(BN_is_zero(p.value))
throw Internal_Error("OpenSSL_IF_Op::private_op: No private key");
OSSL_BN j1, j2, h(i_bn);
BN_mod_exp(j1.value, h.value, d1.value, p.value, ctx.value);
BN_mod_exp(j2.value, h.value, d2.value, q.value, ctx.value);
BN_sub(h.value, j1.value, j2.value);
BN_mod_mul(h.value, h.value, c.value, p.value, ctx.value);
BN_mul(h.value, h.value, q.value, ctx.value);
BN_add(h.value, h.value, j2.value);
return h.to_bigint();
}
}
/*************************************************
* Acquire an IF op *
*************************************************/
IF_Operation* OpenSSL_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 OpenSSL_IF_Op(e, n, d, p, q, d1, d2, c);
}
#endif
}
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