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g10/mainproc: avoid extra hash contexts when decrypting AEAD input 

* g10/mainproc.c (mainproc_context): New member
'seen_pkt_encrypted_aead'.
(release_list): Clear 'seen_pkt_encrypted_aead'.
(proc_encrypted): Set 'seen_pkt_encrypted_aead'.
(have_seen_pkt_encrypted_aead): New.
(proc_plaintext): Do not enable extra hash contexts when decryption
AEAD input.
--

Signed-off-by: Jussi Kivilinna <jussi.kivilinna@iki.fi>
This commit is contained in:
Jussi Kivilinna 2018-11-09 18:07:38 +02:00
parent 643ec7c642
commit b46382dd47
1 changed files with 21 additions and 2 deletions
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23
g10/mainproc.c
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@ -86,6 +86,7 @@ struct mainproc_context
int trustletter; /* Temporary usage in list_node. */
ulong symkeys; /* Number of symmetrically encrypted session keys. */
struct pubkey_enc_list *pkenc_list; /* List of encryption packets. */
int seen_pkt_encrypted_aead; /* PKT_ENCRYPTED_AEAD packet seen. */
struct {
unsigned int sig_seen:1; /* Set to true if a signature packet
has been seen. */
@ -137,6 +138,7 @@ release_list( CTX c )
c->any.data = 0;
c->any.uncompress_failed = 0;
c->last_was_session_key = 0;
c->seen_pkt_encrypted_aead = 0;
xfree (c->dek);
c->dek = NULL;
}
@ -536,6 +538,9 @@ proc_encrypted (CTX c, PACKET *pkt)
int result = 0;
int early_plaintext = literals_seen;
if (pkt->pkttype == PKT_ENCRYPTED_AEAD)
c->seen_pkt_encrypted_aead = 1;
if (early_plaintext)
{
log_info (_("WARNING: multiple plaintexts seen\n"));
@ -704,7 +709,6 @@ proc_encrypted (CTX c, PACKET *pkt)
}
if (!result)
result = decrypt_data (c->ctrl, c, pkt->pkt.encrypted, c->dek );
@ -804,6 +808,21 @@ proc_encrypted (CTX c, PACKET *pkt)
}
static int
have_seen_pkt_encrypted_aead( CTX c )
{
CTX cc;
for (cc = c; cc; cc = cc->anchor)
{
if (cc->seen_pkt_encrypted_aead)
return 1;
}
return 0;
}
static void
proc_plaintext( CTX c, PACKET *pkt )
{
@ -874,7 +893,7 @@ proc_plaintext( CTX c, PACKET *pkt )
}
}
if (!any && !opt.skip_verify)
if (!any && !opt.skip_verify && !have_seen_pkt_encrypted_aead(c))
{
/* This is for the old GPG LITERAL+SIG case. It's not legal
according to 2440, so hopefully it won't come up that often.