* g10/build-packet.c (do_encrypted_aead): New.
(do_symkey_enc): Handle version 5.
(build_packet): Support the ENCRYPTED_AEAD packet.
* g10/cipher.c (MIN_PARTIAL_SIZE): Remove unused macro.
(AEAD_ENC_BUFFER_SIZE): New macro.
(my_iobuf_write): New.
(write_header): Rename to write_cfb_header. Adjust caller.
(set_ocb_nonce_and_ad): New.
(write_ocb_header): New.
(write_ocb_auth_tag): New.
(write_ocb_final_chunk): New.
(do_ocb_flush): New.
(do_ocb_free): New.
(cipher_filter_ocb): New.
* g10/filter.h (cipher_filter_context_t): Add fields for AEAD.
* g10/encrypt.c (encrypt_symmetric): For the use of a session key in
OCB mode.
(encrypt_seskey): Revamp to support OCB.
(use_aead): New.
(encrypt_simple): Support OCB.
(write_symkey_enc): Ditto.
(encrypt_crypt): Ditto.
(encrypt_filter): Handle OCB.
* g10/options.h (opt): Add field force_ocb.
* g10/gpg.c (oForceOCB): New.
(opts): New option "--force-ocb".
(main): Set force_ocb option.
* g10/gpgcompose.c (encrypt_seskey): New.
* g10/keygen.c (aead_available): New global var.
(keygen_set_std_prefs): Set AEAD feature by default in GNUPG mode. Add
parings of aead feature flag.
(keygen_get_std_prefs): Set aead flag.
(add_feature_aead): New.
(keygen_upd_std_prefs): Set OCB as preference if AEAD is enabled.
* g10/pkclist.c (select_aead_from_pklist): New.
(warn_missing_aead_from_pklist): New.
(select_mdc_from_pklist): Remove this unused function.
--
This extends the long available OCB and EAX decryption feature. Due
to the meanwhile expired patent on OCB there is no more reason for
using EAX. Thus we forcefully use OCB if the AEAD feature flag is set
on a key.
In GNUPG mode new keys are now created with the AEAD feature flag set.
Option --rfc4880 is one way to disable this.
GnuPG-bug-id: 6263
* g10/gpg.c: Turn options --force-mdc, --no-force-mdc, --disable-mdc
and --no-disable-mdc into NOPs.
* g10/encrypt.c (use_mdc): Simplify. MDC is now almost always used.
* g10/cipher.c (write_header): Include extra hint and make
translatable.
* g10/options.h (struct opt): Remove fields force_mdc and disable_mdc.
--
The MDC is now always used except with --rfc2440 which will lead to a
a big fat warning.
This is a stripped down version of commit
253e8bdd9014cbe6dc06adce9d9dd2f8f4b31709 which could not directly be
applied due to the AEAD mechanisms there.
Signed-off-by: Werner Koch <wk@gnupg.org>
* g10/gpg.c (oNoMDCWarn): Remove.
(opts): Make --no-mdc-warn a NOP.
(main): Don't set var.
* g10/options.h (struct opt): Remove 'no_mdc_var'.
* g10/cipher-cfb.c (write_header): Assume opt.no_mdc_warn is false.
* g10/mainproc.c (proc_encrypted): Ditto.
--
Users should not be allowed to suppress the warning that they are
shooting into their foot.
Signed-off-by: Werner Koch <wk@gnupg.org>
(cherry picked from commit 96350c5d5afcbc7f66c535e38b9fcc7355622855)
* g10/filter.h (cipher_filter_context_t): Remove unused filed
'create_mdc'. Turn field 'header' into a bit field. Add new fields
'short_blklen_warn' and 'short_blklen_count'.
* g10/cipher.c (write_header): Print a warning if MDC is not used.
(cipher_filter): Print a warning for long messages encrypted with a
short block length algorithm.
--
Note that to test this warning in a reliable way compression needs to
be disabled.
Signed-off-by: Werner Koch <wk@gnupg.org>
* g10/gpg.c (oRFC1991, oPGP2): Remove
(opts): Remove --pgp2 and --rfc1991.
* g10/options.h (CO_PGP2, CO_RFC1991): Remove. Remove all users.
(RFC2440, PGP2): Remove. Remove all code only enabled by these
conditions.
* tests/openpgp/clearsig.test: Remove --rfc1991 test.
--
The use of PGP 2.c is considered insecure for quite some time
now (e.g. due to the use of MD5). Thus we remove all support for
_creating_ PGP 2 compatible messages.
We better do this once and for all instead of cluttering all future
commits with diffs of trailing white spaces. In the majority of cases
blank or single lines are affected and thus this change won't disturb
a git blame too much. For future commits the pre-commit scripts
checks that this won't happen again.
* configure.ac: Remove Camellia restriction.
* gpg.c (main), misc.c (openpgp_cipher_test_algo): Remove Camellia
restriction.
* misc.c (map_cipher_openpgp_to_gcry), main.h: Add macros for
openpgp_cipher_open, openpgp_cipher_get_algo_keylen, and
openpgp_cipher_get_algo_blklen to wrap around the corresponding gcry_*
functions, but pass the algorithm number through
map_cipher_openpgp_to_gcry. This is needed in case the gcry algorithm
number doesn't match the OpenPGP number (c.f. Camellia).
* encr-data.c, pubkey-enc.c, mainproc.c, cipher.c, encode.c, seskey.c,
passphrase.c, seckey-cert.c: Use new openpgp_cipher_* macros here.
to libgcrypt functions, using shared error codes from libgpg-error,
replacing the old functions we used to have in ../util by those in
../jnlib and ../common, renaming the malloc functions and a couple of
types. Note, that not all changes are listed below becuause they are
too similar and done at far too many places. As of today the code
builds using the current libgcrypt from CVS but it is very unlikely
that it actually works.
symmetric compressed files.
* encode.c (encode_simple, encode_crypt): If we are not using a MDC,
compress even if a file is already compressed. This is to help against
the chosen ciphertext attack.
* pkclist.c (select_algo_from_prefs): Fix requested algorithm bug so the
request succeeds even if the requested algorithm is not the first found.
* cipher.c (write_header), encode.c (use_mdc, encode_simple, encode_crypt,
encrypt_filter), g10.c (main): Be more eager to use a MDC. We use a MDC
if the keys directly support it, if the keys list AES (any) or TWOFISH
anywhere in the prefs, or if the cipher chosen does not have a 64 bit
blocksize.
