Method TestDecryption

src/tw/filemanipulator.cpp:143–217

Try to decrypt the file using the given key. If thorough is true then the entire file is read into memory. Returns true if decryption was successful.

// the entire file is read into memory.  Returns true if decryption was
// successful.
bool cFileManipulator::TestDecryption(const cElGamalSigPublicKey& key, bool thorough)
{
    // TODO: pay attention to thorough flag.  For now we will just always act thoroughly.

    ASSERT(mbInit);
    if (!mbInit)
    {
        return false;
    }

    bool fError = false;

    // "turn down" the verbosity of iUserNotify to V_NORMAL it it is V_VERBOSE to make output a little cleaner
    bool fChangedVerbosity = false;
    int  savedVerbosity    = iUserNotify::GetInstance()->GetVerboseLevel();
    if (savedVerbosity == iUserNotify::V_VERBOSE)
    {
        iUserNotify::GetInstance()->SetVerboseLevel(iUserNotify::V_NORMAL);
        fChangedVerbosity = true;
    }

    try
    {
        if (mFileHeader.GetID() == cFCODatabaseFile::GetFileHeaderID())
        {
            cFCODatabaseFile db;
            bool             encrypted;
            cTWUtil::ReadDatabase(mFileName.c_str(), db, &key, encrypted);
        }
        else if (mFileHeader.GetID() == cFCOReport::GetFileHeaderID())
        {
            cFCOReport       rep;
            cFCOReportHeader reph;
            bool             encrypted;
            cTWUtil::ReadReport(mFileName.c_str(), reph, rep, &key, true, encrypted);
        }
        else if (mFileHeader.GetID() == cConfigFile::GetFileHeaderID())
        {
            // read the embedded key from config file and see if it is the same
            // as the public key passed in.
            cMemoryArchive memArch;
            TSTRING        configText; //not used
            cTWUtil::ReadConfigText(mFileName.c_str(), configText, &memArch);
            memArch.Seek(0, cBidirArchive::BEGINNING);

            // only do the test if there is baggage (indicating the cfg file is encrypted)
            if (memArch.Length() > 0)
            {
                // create the two public keys...
                cElGamalSigPublicKey pubKey(memArch.GetMemory());

                // compare the two ....
                if (!pubKey.IsEqual(key))
                    throw ePoly();
            }
        }
        else if (mFileHeader.GetID() == cPolicyFile::GetFileHeaderID())
        {