CryptoPP cannot decode a cipher encrypted with Public key

I am using Cryptopp with Qt, My server sends a Public key to my client, the client encrypts a username with it and sends it (I have tested the cipher is sent properly) but server side i have an error : "invalid ciphertext", here is the code from my client :

QByteArray writtendata;
QDataStream streamBytes(&writtendata,QIODevice::WriteOnly);

streamBytes << quint16(0) << bytes;
streamBytes << (quint16) (bytes.size() - sizeof(quint16));

int     written = socket->write(writtendata);
std :: cout << "sent : " << written << std :: endl ;

and server side :

        in >> datalenth;
        qDebug() << "datalength    : " << datalenth;

        if (socket->bytesAvailable() < datalenth)
        qDebug() << "byte available    : " << socket->bytesAvailable();
        QByteArray read;
        in >> read;
        qDebug() << "Read    : " << read.size();
        ifstream my;"cipher.txt");

        string str((std::istreambuf_iterator<char>(my)), std::istreambuf_iterator<char>());
        qDebug() << "str:  "<< str.size();
        cout << str <<endl ;
        string recovered = T->discryptor(str) ;
        std :: cout << "recovered : " << recovered << std :: endl;

I don't really know where the problem comes from.

Hope that anyone can shed some light on this.


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