Master of Science thesis Fighting Spam

public OutgoingMailProcessor(Control control)
{
this.control = control;
}
public MimeMessage processMail(MimeMessage extm) throws MessagingException, Exception
{
MimeTools.writeMimeFile(extm,"d:\\original.msg");
Address[] to = extm.getRecipients(Message.RecipientType.TO);
String receivers = "";
for(int i = 0; i < to.length; i++)
receivers += to[i].toString();
Debugger.debug(getClass(), 1, "Processing mail to: " + receivers);
//try
//{
Debugger.debug(getClass(), 2, "Attaching coin...");
//Just using 1 coin at the moment
Coin[] coins = control.getCoinsToSend(1,to);
//Create signature 1
Signature recipientSignature =
createRecipientSignature(coins[0].getSerialNumber(), extm);
//Create signature 2
Signature mailSignature = createMailSignature(extm);
//Add all the parts to the email...
CoinHeader header = new CoinHeader(recipientSignature, mailSignature,
coins[0], control.getCertificate());
}
MimeMessage extm2 = MimeTools.addAttachmentHeader(extm, header);
Debugger.debug(getClass(), 2, "Done.");
//MimeTools.writeMimeFile(extm2,"d:\\outgoing.msg");
return extm2;
// Allow sending without attachment
/*}
catch(Exception e)
{
Debugger.debug(getClass(), 2, "Exception...cannot attach.", e);
Debugger.debug(getClass(), 2, "Sending without attachment...");
return extm;
}*/
private Signature createRecipientSignature(long serialNumber, MimeMessage msg) throws
Exception
{
Debugger.debug(getClass(), 2, "Creating Recipient signature...");
Fingerprint recipientHash = Coin.getHash2(serialNumber,
((InternetAddress)msg.getRecipients(Message.RecipientType.TO)[0]).getAddress());
return Cryptotools.sign(control.getPrivateKey(), recipientHash);
}
private Signature createMailSignature(MimeMessage extm) throws MessagingException,
Exception
{
Debugger.debug(getClass(), 2, "Creating Mail signature...");
return Cryptotools.sign(control.getPrivateKey(),
MailFunctions.createMailHash(extm));
}
}
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