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Code Activity

gpg: First take on PKT_ENCRYPTED_AEAD.

Browse source 
* common/openpgpdefs.h (PKT_ENCRYPTED_AEAD): New const.
* g10/dek.h (DEK): Increase size of use_aead to 4 bits.
* g10/filter.h (cipher_filter_context_t):  Add new fields for AEAD.
* g10/packet.h (PKT_encrypted): Add fields aead_algo, cipher_algo, and
chunkbyte.
* g10/build-packet.c (do_encrypted_aead): New.
(build_packet): Call it.
* g10/parse-packet.c (dump_sig_subpkt): Handle SIGSUBPKT_PREF_AEAD.
(parse_one_sig_subpkt, can_handle_critical): Ditto.
(parse_encrypted): Clear new PKT_ENCRYPTED fields.
(parse_encrypted_aead): New.
(parse): Call it.
* g10/gpg.c (main): Take care of --rfc4880bis option when checking
compliance.
* g10/cipher-aead.c: Replace the stub by real code.
* g10/decrypt-data.c (decode_filter_ctx_t): Add fields for use with
AEAD.
(aead_set_nonce): New.
(aead_set_ad): New.
(decrypt_data): Support AEAD.
(aead_underflow): New.
(aead_decode_filter): New.
* g10/encrypt.c (use_aead): Make that new fucntion work.
(encrypt_simple): Use default_aead_algo() instead of EAX.
* g10/mainproc.c (proc_encrypted): Support AEAD.
(do_proc_packets): Support PKT_ENCRYPTED_AEAD.
--

This code has seen only a very few manual tests.  Encrypting always
uses a 64k chunks and decryption has not been tested with larger
chunks.  Those small chunks make debugging much faster.

Tests can be done using:

  gpg --rfc4880bis --pinentry-mode=loopback --passphrase abc \
      --force-aead --aead-algo ocb --s2k-mode 0 --cipher AES \
      -v -z 0 --status-fd 2 -c <INFILE >OUTFILE

and

  gpg --rfc4880bis --pinentry-mode=loopback --passphrase=abc \
      --status-fd 2 -v -d <INFILE >OUTFILE

Signed-off-by: Werner Koch <wk@gnupg.org>
This commit is contained in:
Werner Koch 2018-01-21 16:24:43 +01:00
parent 81d71818d0
commit 3f4ca85cb0
No known key found for this signature in database
GPG key ID: E3FDFF218E45B72B
12 changed files with 1235 additions and 138 deletions
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7
doc/DETAILS
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@ -518,9 +518,10 @@ pkd:0:1024:B665B1435F4C2 .... FF26ABB:
actual key used for descryption. <fpr2> is the fingerprint of the
primary key. <otrust> is the letter with the ownertrust; this is
in general a 'u' which stands for ultimately trusted.
*** DECRYPTION_INFO <mdc_method> <sym_algo>
*** DECRYPTION_INFO <mdc_method> <sym_algo> [<aead_algo>]
Print information about the symmetric encryption algorithm and the
MDC method. This will be emitted even if the decryption fails.
For an AEAD algorithm AEAD_ALGO is not 0.
*** DECRYPTION_FAILED
The symmetric decryption failed - one reason could be a wrong
@ -540,8 +541,10 @@ pkd:0:1024:B665B1435F4C2 .... FF26ABB:
--override-session-key. It is not an indication that the
decryption will or has succeeded.
*** BEGIN_ENCRYPTION <mdc_method> <sym_algo>
*** BEGIN_ENCRYPTION <mdc_method> <sym_algo> [<aead_algo>]
Mark the start of the actual encryption process.
MDC_METHOD shall be 0 if an AEAD_ALGO is not 0. Users should
however ignore MDC_METHOD if AEAD_ALGO is not 0.
*** END_ENCRYPTION
Mark the end of the actual encryption process.