DSA_Verification_Operation::DSA_Verification_Operation(const DSA_PublicKey& dsa) :
q(dsa.group_q()), y(dsa.get_y())
{
powermod_g_p = Fixed_Base_Power_Mod(dsa.group_g(), dsa.group_p());
powermod_y_p = Fixed_Base_Power_Mod(y, dsa.group_p());
mod_p = Modular_Reducer(dsa.group_p());
mod_q = Modular_Reducer(dsa.group_q());
}
/*
* Default_ELG_Op Constructor
*/
Default_ELG_Op::Default_ELG_Op(const DL_Group& group, const BigInt& y,
const BigInt& x) : p(group.get_p())
{
powermod_g_p = Fixed_Base_Power_Mod(group.get_g(), p);
powermod_y_p = Fixed_Base_Power_Mod(y, p);
mod_p = Modular_Reducer(p);
if(x != 0)
powermod_x_p = Fixed_Exponent_Power_Mod(x, p);
}
Blinder::Blinder(const BigInt& modulus,
std::function<BigInt (const BigInt&)> fwd_func,
std::function<BigInt (const BigInt&)> inv_func)
{
m_reducer = Modular_Reducer(modulus);
#if defined(BOTAN_HAS_SYSTEM_RNG)
auto& rng = system_rng();
#else
AutoSeeded_RNG rng;
#endif
const BigInt k(rng, modulus.bits() - 1);
m_e = fwd_func(k);
m_d = inv_func(k);
}
/*
* Fixed_Window_Exponentiator Constructor
*/
Fixed_Window_Exponentiator::Fixed_Window_Exponentiator(const BigInt& n,
Power_Mod::Usage_Hints hints)
: m_reducer{Modular_Reducer(n)}, m_exp{}, m_window_bits{}, m_g{}, m_hints{hints}
{}
