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Commit Graph

14 Commits

Author SHA1 Message Date
Daniel Kahn Gillmor
924518b10d
gpg: Add option --weak-digest to gpg and gpgv.
* g10/options.h: Add weak_digests linked list to opts.
* g10/main.h: Declare weakhash linked list struct and
additional_weak_digest() function to insert newly-declared weak
digests into opts.
* g10/misc.c: (additional_weak_digest): New function.
(print_digest_algo_note): Check for deprecated digests.
* g10/sig-check.c: (do_check): Reject all weak digests.
* g10/gpg.c: Add --weak-digest option to gpg.
* doc/gpg.texi: Document gpg --weak-digest option.
* g10/gpgv.c: Add --weak-digest option to gpgv.
* doc/gpgv.texi: Document gpgv --weak-digest option.

--
gpg and gpgv treat signatures made over MD5 as unreliable, unless the
user supplies --allow-weak-digests to gpg.  Signatures over any other
digest are considered acceptable.

Despite SHA-1 being a mandatory-to-implement digest algorithm in RFC
4880, the collision-resistance of SHA-1 is weaker than anyone would
like it to be.

Some operators of high-value targets that depend on OpenPGP signatures
may wish to require their signers to use a stronger digest algorithm
than SHA1, even if the OpenPGP ecosystem at large cannot deprecate
SHA1 entirely today.

This changeset adds a new "--weak-digest DIGEST" option for both gpg
and gpgv, which makes it straightforward for anyone to treat any
signature or certification made over the specified digest as
unreliable.

This option can be supplied multiple times if the operator wishes to
deprecate multiple digest algorithms, and will be ignored completely
if the operator supplies --allow-weak-digests (as before).

MD5 is always considered weak, regardless of any further
--weak-digest options supplied.

Signed-off-by: Daniel Kahn Gillmor <dkg@fifthhorseman.net>

(this is a rough cherry-pick of applying the following commits to
 STABLE-BRANCH-1-4:
  76afaed65e
  b98939812a
  91015d021b
)
2015-12-19 15:14:27 +01:00
Werner Koch
f5c32bd1c6 doc: Update from master. 2013-10-04 21:01:16 +02:00
Werner Koch
1e1b57a294 Preparing for a release candidate 2009-08-13 08:45:23 +00:00
Werner Koch
d9527051eb Revert that last stupid setuid detection fix. 2008-07-17 19:47:19 +00:00
Werner Koch
7cb81bb3ef Preparing 1.4.7 2007-03-05 10:22:56 +00:00
Werner Koch
d8ff6704c8 Preparing a release 2006-12-06 09:52:40 +00:00
Werner Koch
68629647f3 Changing the way man pages are build. 2006-12-04 13:51:18 +00:00
Werner Koch
9b7f1f6976 exported subkeys are now merged into one output keyblock 2005-10-17 17:21:15 +00:00
Werner Koch
d7fd47185e * configure.ac: New option --disable-gnupg-iconv, define
USE_GNUPG_ICONV.
(AC_CANONICAL_TARGET): Replaced by AC_CANONICAL_HOST. Changed all
reference to TARGET to HOST.  Made sure that i586-mingw32msvc gets
detected as mingw32.
(UNIT64_C): Don't include inttype.h uncoditional but use a test to
ensure that it gets into conftest.h.
(AH_TOP): New. Prevent double inclusion of config.h.

* config.links: Use HOST instead of TARGET.
2004-10-26 19:33:41 +00:00
Werner Koch
e4b885e1d7 Rebuilt 2004-10-15 09:39:10 +00:00
Werner Koch
1d315be6fa * mk-w32-dist: Updated from stable branch.
* mk-gpg-texi: Changed to use the newer docbook2x-texi utility.

* config.guess, config.sub, mkinstalldirs, missing
* depcomp, install-sh: Upgraded.
2004-10-01 10:11:42 +00:00
Werner Koch
41bfaa5e51 About to release 1.3.2 2003-05-27 08:38:58 +00:00
Werner Koch
4cbc79e48b * Makefile.am: Due to problems with VPATH builds we don't try to
build the texi vesions of the manual pages anymore automatically.
2002-07-01 08:51:43 +00:00
David Shaw
151ee2f47b Update head to match stable 1.0 2002-06-29 13:31:13 +00:00