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/*
* IF Algorithm Core
* (C) 1999-2007 Jack Lloyd
*
* Distributed under the terms of the Botan license
*/
#include <botan/if_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;
}
/*
* IF_Core Constructor
*/
IF_Core::IF_Core(const BigInt& e, const BigInt& n)
{
op = Engine_Core::if_op(e, n, 0, 0, 0, 0, 0, 0);
}
/*
* IF_Core Constructor
*/
IF_Core::IF_Core(RandomNumberGenerator& rng,
const BigInt& e, const BigInt& n, const BigInt& d,
const BigInt& p, const BigInt& q,
const BigInt& d1, const BigInt& d2, const BigInt& c)
{
op = Engine_Core::if_op(e, n, d, p, q, d1, d2, c);
if(BLINDING_BITS)
{
BigInt k(rng, std::min(n.bits()-1, BLINDING_BITS));
blinder = Blinder(power_mod(k, e, n), inverse_mod(k, n), n);
}
}
/*
* IF_Core Copy Constructor
*/
IF_Core::IF_Core(const IF_Core& core)
{
op = 0;
if(core.op)
op = core.op->clone();
blinder = core.blinder;
}
/*
* IF_Core Assignment Operator
*/
IF_Core& IF_Core::operator=(const IF_Core& core)
{
delete op;
if(core.op)
op = core.op->clone();
blinder = core.blinder;
return (*this);
}
/*
* IF Public Operation
*/
BigInt IF_Core::public_op(const BigInt& i) const
{
return op->public_op(i);
}
/*
* IF Private Operation
*/
BigInt IF_Core::private_op(const BigInt& i) const
{
return blinder.unblind(op->private_op(blinder.blind(i)));
}
}
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