gpg: Unify AEAD parameter retrieval.

* g10/pkclist.c (select_aead_from_pklist): Return the AEAD_algo.
* g10/encrypt.c (use_aead): Return the AEAD algo.
(encrypt_simple): Adjust for this change.
(encrypt_crypt): Ditto.
(encrypt_filter): Ditto.
* g10/sign.c (sign_symencrypt_file): Ditto.

* g10/misc.c (MY_GCRY_CIPHER_MODE_EAX): New.
(openpgp_aead_algo_info): New.
* g10/cipher-aead.c (MY_GCRY_CIPHER_MODE_EAX): Remove.
(write_header): Use new fucntion.
* g10/decrypt-data.c (MY_GCRY_CIPHER_MODE_EAX): Remove.
(decrypt_data): Use new function.  Also allow for chunkbytes other
than 10.
--

Note that other chunk bytes than 10 and in particular 0 (64 byte
chunks) have not yet been tested.

Signed-off-by: Werner Koch <wk@gnupg.org>

1 files changed, 3 insertions, 21 deletions

diff --git a/g10/cipher-aead.c b/g10/cipher-aead.c
index 1d7263419..637bd71a7 100644
--- a/g10/cipher-aead.c
+++ b/g10/cipher-aead.c
@@ -33,10 +33,6 @@
 #include "options.h"
 #include "main.h"
 
-/* FIXME: Libgcrypt 1.9 will support EAX.  Until we kame this a
- * requirement we hardwire the enum used for EAX.  */
-#define MY_GCRY_CIPHER_MODE_EAX 14
-
 
 /* The size of the buffer we allocate to encrypt the data.  This must
  * be a multiple of the OCB blocksize (16 byte).  */
@@ -149,23 +145,9 @@ write_header (cipher_filter_context_t *cfx, iobuf_t a)
   if (blocksize != 16 )
     log_fatal ("unsupported blocksize %u for AEAD\n", blocksize);
 
-  switch (cfx->dek->use_aead)
-    {
-    case AEAD_ALGO_OCB:
-      ciphermode = GCRY_CIPHER_MODE_OCB;
-      startivlen = 15;
-      break;
-
-    case AEAD_ALGO_EAX:
-      ciphermode = MY_GCRY_CIPHER_MODE_EAX;
-      startivlen = 16;
-      break;
-
-    default:
-      log_error ("unsupported AEAD algo %d\n", cfx->dek->use_aead);
-      err = gpg_error (GPG_ERR_NOT_IMPLEMENTED);
-      goto leave;
-    }
+  err = openpgp_aead_algo_info (cfx->dek->use_aead, &ciphermode, &startivlen);
+  if (err)
+    goto leave;
 
   cfx->chunkbyte = 10;
   cfx->chunksize = (uint64_t)1 << (cfx->chunkbyte + 6);