Hi, Please do a "Reply All" when replying so that the mail also is sent to the libreoffice-dev mailing list. On Tue, Jul 24, 2018 at 10:11 AM, Vikas Mahato <vikasmahato0 at gmail.com> wrote: > Hi, > > I am trying to implement credentials for external data source as part of my > GSoC project. I want to encrypt the credentials and store them to a file. > moggi ( my mentor) asked me to implement it using CryptTools but I am not > sure how to proceed. > Well in that case ask your mentor what you should use to create the key. As I said key creation is key (no pun intended) and we already have ways to securely create keys so it is a matter to decide which one to use. It is possible to use the same algorithm that is used in OOXML document encryption, however you'd need to store additional encryption info inside the file (by using oox::core::AgileEngine, look at oox/qa/unit/CryptoTest.cxx for some examples), or maybe it would be simpler to just use the OleStorage like the OOXML documents do to store the encryption info and the file content or a ZipStorage. Or use the same encryption as ODF files. Anyway ask your mentor what he has in mind for this as this is not at all a trivial decision. Regards, Tomaž