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Re: [pdf-devel] Contribute to the project
From: |
jemarch |
Subject: |
Re: [pdf-devel] Contribute to the project |
Date: |
Sun, 27 Jul 2008 16:12:08 +0200 |
User-agent: |
Wanderlust/2.14.0 (Africa) SEMI/1.14.6 (Maruoka) FLIM/1.14.8 (Shijō) APEL/10.6 Emacs/23.0.60 (i686-pc-linux-gnu) MULE/6.0 (HANACHIRUSATO) |
Hello David.
I tell you: the standard defines only two algorithms in order to
decrypt pdf streams and strings.
In the GNU PDF Library we will want to provide the possibility of
using more advanced encryption algorithms from libgcrypt.
On the one hand we must implement the AES algorithm, just like it
already is in the pdf knowledge database [1].
Do libgcrypt implment the AES algorithm? If not we may need to write
it ourselves.
On the other hand, the second algorithm is known as RC4, which
unfortunately is, according to the reference, a proprietary
algorithm copyrighted by RSA Security, Inf. I hope it doesn't
arise any legal impediment.
We discussed the legal issue of RC4 some time ago and the conclusion
was that it is not a problem to implement the 4arcs algorithm.
Finally we will need md5 message-digest functions too.
I am not sure but I think libcrypt doesn't provide this. Have we
work to do here?
Could you please check?
- [pdf-devel] Contribute to the project, David Vazquez, 2008/07/24
- Re: [pdf-devel] Contribute to the project, jemarch, 2008/07/25
- Message not available
- Re: [pdf-devel] Contribute to the project, David Vázquez, 2008/07/26
- Re: [pdf-devel] Contribute to the project,
jemarch <=
- Re: [pdf-devel] Contribute to the project, David Vazquez, 2008/07/27
- [pdf-devel] Encryption filters, jemarch, 2008/07/27
- Re: [pdf-devel] Encryption filters, David Vazquez, 2008/07/27
- RE: [pdf-devel] Encryption filters, Leonard Rosenthol, 2008/07/28
- Re: [pdf-devel] Encryption filters, jemarch, 2008/07/28
- RE: [pdf-devel] Encryption filters, Leonard Rosenthol, 2008/07/29
- Re: [pdf-devel] Encryption filters, jemarch, 2008/07/29
- Re: [pdf-devel] Encryption filters, jemarch, 2008/07/28
- Re: [pdf-devel] Encryption filters, Ralph Giles, 2008/07/28
- Re: [pdf-devel] Encryption filters, jemarch, 2008/07/28