psubgroup.cpp

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#include "psubgroup.hpp"


using namespace arithm;


PSubGroup::PSubGroup(Group * bgrp, mpz_class order, mpz_class gen) :
        Group(order, gen)
{
        baseGroup = bgrp;
        coOrder = baseGroup->getMultOrder() / order;
        if (!isIn(generator))
        {
                std::cout<<"ERROR: in PSubGroup(bgrp, order, gen), the "
                         <<"generator is not of the correct order."
                         <<"\ngen="<<gen.get_str(16)
                         <<"\norder="<<order.get_str(16)<<std::endl;
        }
}


Elmt PSubGroup::multiplication(Elmt e1, Elmt e2)
{
        return Elmt(baseGroup->multiplication(e1,e2).getValue(), this);
}


Elmt PSubGroup::multInverse(Elmt e)
{
        return Elmt(baseGroup->multInverse(e).getValue(), this);
}


Elmt PSubGroup::exponentiation(Elmt e, Elmt s)
{
        return Elmt(baseGroup->exponentiation(e,s).getValue(), this);
}


unsigned int PSubGroup::getLeafSize()
{
        return baseGroup->getLeafSize();
}


bool PSubGroup::isIn(mpz_class r)
{
        Elmt trial = baseGroup->exponentiation(
                Elmt(r,baseGroup),Elmt(multOrder,baseGroup));
        return (trial.getValue() == 1);                
}


std::string PSubGroup::getType()
{
        return "PSubGroup of a " + baseGroup->getType();
}