Rsa- key generation

[Behrens, Meike]

Good morning.

Is there a way to generate the private key in a function, convert it to
string give it back, in another function get the private-key-string and
get the public key from that string-private key? 
If it is, can someone please give me a clue?

This is my code at the moment:

string CreatePrivkey()
{
        string privateKey;

        RandomPool randPool;
        randPool.Put((byte *)"1234567890", 10);

        RSAES_OAEP_SHA_Decryptor priv(randPool, 1024);
        HexEncoder privSink(new StringSink(privateKey));
        priv.DEREncode(privSink);
        privSink.MessageEnd();
        return privateKey;
}
string CreatePubkey(string privkey)
{
        string publicKey;
        //InvertibleRSAFunction privKey;
        //int intkey;
        //char* charkey;
        //charkey = 
        //intkey = atoi((char*)privkey);
        //intkey = privkey;
        //RSAES_OAEP_SHA_Encryptor pub(intkey);
        //HexEncoder pubSink(new StringSink(publicKey));
        //pub.DEREncode(pubSink);
        //pubSink.MessageEnd();
        
        //BufferedTransformation. blubb;
//      &blubb = privkey;
//      privKey.Load(privkey);
        /*RSAFunction pubkey;
        pubkey.AssignFrom(privkey);
        HexEncoder pubFile(new FileSink("D:\\public_key.txt"));
        pubkey.DEREncode(pubFile);
        pubFile.MessageEnd();
        return privkey;*/
        return privkey;
}

Thank you for your help.
Meike