Java Security

Hi,

I'm developing an application that is supposed to sign digital invoices in XML format. That's not a big deal using XML DSIG and Apache Security library.

Problem cames up when I need to generate a timestamp for the XML document using XAdES. I can't find any Java implementacion that makes that work for me. I've seen there are some third-party tools like IAIK TSP that implements request/response protocols between TSA servers and clients but I wonder if there is any way to generate a timestamp by myself, without any kind of TSA (client trusts on my site so there's no problem with that).

Any idea or recommendation would be appreciated (sign with XML-DSIG and attached another kind of timestamping, attached external timestamp, PKCS7, etc.)

Thanks in advanced
Jorge Ortiz