On Thu, Mar 04, 2010 at 06:13:17PM -0500, David Shaw wrote: > On Mar 4, 2010, at 4:34 PM, Nicolas Boullis wrote: > > > Reading RFC 4880 (OpenPGP standard), if I am able to decrypt the session > > key, it should be possible to create a new Public-Key Encrypted Session > > Key packet to allow a new key to decrypt the file/message. Removing a > > Public-Key Encrypted Session Key should also be trivial. > > Yes. > > > Does gnupg allow such manipulations? > > No. > > > Or does anyone have suggestions how I should implement this? Libraries > > to use? > > You might be able to hack something together using the GnuPG sources. > Certainly all of the parts you need are in there - you'd just have to > put them together.
OK, thanks for your answer. I will now have a look at how things are organised in GnuPG code. Would you suggest that I look at the GnuPG 1 or GnuPG 2 code? And if I succeed to implement this correctly, do you think the feature might be merged in GnuPG? > Alternately, take a look at > http://openpgp.nominet.org.uk/cgi-bin/trac.cgi for a library that you > might also borrow some code from. As I understand it, it does not support ElGamal, which is a show-stopper for my needs. But that's interestig anyway. Regards, -- Nicolas Boullis
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