McDougall, Marshall (STEM) wrote:
> Hi All.
>
> First postbe gentle :-}
>
> I have a RHEL server and I am having difficulty decrypting a pgp
> encrypted file. Near as I can tell, I need the IDEA cipher.
>
> [EMAIL PROTECTED] gpg --decrypt myfile.txt
> gpg: protection algorithm 1 (IDEA) is not supported
> gpg: the IDEA cipher plugin is not present
> gpg: please see http://www.gnupg.org/why-not-idea.html for more
> information
> gpg: encrypted with 1024-bit RSA key, ID C0A298D3, created 2004-07-13
> "one_of_my_keys"
> gpg: public key decryption failed: unknown cipher algorithm
> gpg: decryption failed: secret key not available
>
> I roamed around the GNUPG site and found the "idea.c.gz" downloads, but
> the instructions allude to directories that don't exist on my server.
> Has anyone added IDEA to an existing canned redhat installation? I am
> open to any suggestion. Thanks.
You can rebuild the gnupg srpm and add idea. A few small changes to
the spec file (like in the attached diff) should do what you want.
A better solution would be to have sender encrypt the file to you
using a cipher that you can use without any patents or other
encumbrances. Does your key have a cipher pref for IDEA? If so, you
should fix that so other people don't encrypt things to you that you
can't easily decrypt. You can view your prefs with:
$ gpg --edit-key C0A298D3 showpref quit
--
ToddOpenPGP -> KeyID: 0xBEAF0CE3 | URL: www.pobox.com/~tmz/pgp
~~
I never met a morphosis I didn't like.
--- gnupg.spec~ 2007-03-01 07:47:37.0 -0500
+++ gnupg.spec 2008-01-23 14:40:16.0 -0500
@@ -1,12 +1,13 @@
Summary: A GNU utility for secure communication and data storage.
Name: gnupg
Version: 1.4.5
-Release: 13
+Release: 13.1
License: GPL
Group: Applications/System
Source0: ftp://ftp.gnupg.org/gcrypt/gnupg/gnupg-%{version}.tar.bz2
Source1: ftp://ftp.gnupg.org/gcrypt/gnupg/gnupg-%{version}.tar.bz2.sig
Source2: gnupg-shm-coprocessing.expect
+Source3: ftp://ftp.gnupg.dk/pub/contrib-dk/idea.c.gz
Patch0: gnupg-1.4.1-gcc.patch
Patch1: gnupg-1.4.2-curl.patch
Patch2: gnupg-1.4.5-CVE-2006-6169.patch
@@ -42,6 +43,7 @@
%patch4 -p0 -b .CVE-2006-6235
popd
%patch5 -p2 -b .multiple-message
+gunzip -c %{SOURCE3} > cipher/idea.c
autoreconf
%build
@@ -109,6 +111,9 @@
%{_mandir}/man7/*
%changelog
+* Wed Jan 23 2008 Todd Zullinger <[EMAIL PROTECTED]> - 1.4.5-13.1
+- include the IDEA cipher
+
* Thu Mar 1 2007 Nalin Dahyabhai <[EMAIL PROTECTED]> - 1.4.5-13
- incorporate patch from Werner to work around clients which
can't tell that multiple plain messages have been processed (#230457)
pgpR8n9YbbxWy.pgp
Description: PGP signature
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