gpg: First take on PKT_ENCRYPTED_AEAD.

* 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 <[email protected]>

1 files changed, 2 insertions, 0 deletions

diff --git a/common/openpgpdefs.h b/common/openpgpdefs.h
index aeb3389a7..8699a178d 100644
--- a/common/openpgpdefs.h
+++ b/common/openpgpdefs.h
@@ -51,6 +51,7 @@ typedef enum
     PKT_ATTRIBUTE     = 17, /* PGP's attribute packet. */
     PKT_ENCRYPTED_MDC = 18, /* Integrity protected encrypted data. */
     PKT_MDC 	      = 19, /* Manipulation detection code packet. */
+    PKT_ENCRYPTED_AEAD= 20, /* AEAD encrypted data packet. */
     PKT_COMMENT	      = 61, /* new comment packet (GnuPG specific). */
     PKT_GPG_CONTROL   = 63  /* internal control packet (GnuPG specific). */
   }
@@ -143,6 +144,7 @@ typedef enum
 cipher_algo_t;
 
 
+/* Note that we encode the AEAD algo in a 3 bit field at some places.  */
 typedef enum
   {
     AEAD_ALGO_NONE	    =  0,