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#include "dhparam.h"
#include <QFile>
#include <QDir>


DHParam *DHParam::dhparamgenerator = NULL;
QString DHParam::current_dhparam_file;

DHParam::DHParam(QObject *parent) :
    QObject(parent)
{
}


bool DHParam::VerifyDefault(QString *errormsg)
{
    if (!QFile::exists(config_defaultDHParam))
    {
        if (errormsg)
            *errormsg =
                QString(tr("Diffie-Hellman parameters file \"%1\" does not exist"))
                .arg(config_defaultDHParam);

        return false;
    }

    return true;
}

bool DHParam::VerifyGenerated(QString *errormsg)
{
    if (!QFile::exists(config_dir + QDir::separator() + PICA_CLIENT_DHPARAMFILE))
        return false;

    return true;
}

bool DHParam::UseDefault()
{
    return QFile::copy(config_defaultDHParam, config_dir + QDir::separator() + PICA_CLIENT_DHPARAMFILE);
}

bool DHParam::StartNewDHParamGeneration(QString *errormsg)
{
    if (dhparamgenerator)
    {
    if (errormsg)
        *errormsg = QString(tr("Diffie-Hellman parameter generation process is already running"));
        return false;
    }

    dhparamgenerator = new DHParam();

    if (!dhparamgenerator)
        return false;

    QString tempdhfile = config_dir + QDir::separator() + PICA_CLIENT_DHPARAMFILE + ".temp";

    if (QFile::exists(tempdhfile))
        QFile::remove(tempdhfile);

    return dhparamgenerator -> osslt.GenDHParamSignal(PICA_CLIENT_DHPARAMBITS,
                    tempdhfile, dhparamgenerator, SLOT(DHParamGenFinished(int,QProcess::ExitStatus)));
}

QString DHParam::GetDHParamFilename()
{
    if (current_dhparam_file.isEmpty())
    {
        if (QFile::exists(config_dir + QDir::separator() + PICA_CLIENT_DHPARAMFILE))
            current_dhparam_file = config_dir + QDir::separator() + PICA_CLIENT_DHPARAMFILE;
        else
            current_dhparam_file = config_defaultDHParam;
    }

    return current_dhparam_file;
}

void DHParam::DHParamGenFinished(int retval, QProcess::ExitStatus)
{
    if (retval == 0)
    {
        if (QFile::exists(config_dir + QDir::separator() + PICA_CLIENT_DHPARAMFILE))
            QFile::remove(config_dir + QDir::separator() + PICA_CLIENT_DHPARAMFILE);

        QFile::rename(config_dir + QDir::separator() + PICA_CLIENT_DHPARAMFILE + ".temp",
                        config_dir + QDir::separator() + PICA_CLIENT_DHPARAMFILE);

        current_dhparam_file = config_dir + QDir::separator() + PICA_CLIENT_DHPARAMFILE;

        delete dhparamgenerator;

        dhparamgenerator = NULL;
    }
}