/*************************************************
* DH_Core Constructor *
*************************************************/
DH_Core::DH_Core(RandomNumberGenerator& rng,
const DL_Group& group, const BigInt& x)
{
op = Engine_Core::dh_op(group, x);
const BigInt& p = group.get_p();
BigInt k(rng, std::min(p.bits()-1, BLINDING_BITS));
if(k != 0)
blinder = Blinder(k, power_mod(inverse_mod(k, p), x, p), p);
}
/*************************************************
* 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);
}
}
/*************************************************
* ELG_Core Constructor *
*************************************************/
ELG_Core::ELG_Core(RandomNumberGenerator& rng,
const DL_Group& group, const BigInt& y, const BigInt& x)
{
op = Engine_Core::elg_op(group, y, x);
const BigInt& p = group.get_p();
p_bytes = p.bytes();
if(BLINDING_BITS)
{
BigInt k(rng, std::min(p.bits()-1, BLINDING_BITS));
blinder = Blinder(k, power_mod(k, x, p), p);
}
}
DH_KA_Operation::DH_KA_Operation(const DH_PrivateKey& dh) :
p(dh.group_p()), powermod_x_p(dh.get_x(), p)
{
BigInt k(global_state().global_rng(), p.bits() - 1);
blinder = Blinder(k, powermod_x_p(inverse_mod(k, p)), p);
}
