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gpg: Allow the use of an ADSK subkey as ADSK subkey.

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* g10/packet.h (PKT_public_key): Increased size of req_usage to 16.
* g10/getkey.c (key_byname): Set allow_adsk in the context if ir was
requested via req_usage.
(finish_lookup): Allow RENC usage matching.
* g10/keyedit.c (append_adsk_to_key): Adjust the assert.
* g10/keygen.c (prepare_adsk): Also allow to find an RENC subkey.
--

If an ADSK is to be added it may happen that an ADSK subkey is found
first and this should then be used even that it does not have the E
usage.  However, it used to have that E usage when it was added.

While testing this I found another pecularity: If you do
  gpg -k ADSK_SUBKEY_FPR
without the '!' suffix and no corresponding encryption subkey is dound,
you will get an unusabe key error.  I hesitate to fix that due to
possible side-effects.

GnuPG-bug-id: 6882
This commit is contained in:
Werner Koch 2024-10-31 15:11:55 +01:00
parent a7c81efe51
commit d30e345692
No known key found for this signature in database
GPG key ID: E3FDFF218E45B72B
4 changed files with 16 additions and 10 deletions
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2
g10/keygen.c
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@ -4646,7 +4646,7 @@ prepare_adsk (ctrl_t ctrl, const char *name)
}
adsk_pk = xcalloc (1, sizeof *adsk_pk);
adsk_pk->req_usage = PUBKEY_USAGE_ENC;
adsk_pk->req_usage = PUBKEY_USAGE_ENC | PUBKEY_USAGE_RENC;
err = get_pubkey_byname (ctrl, GET_PUBKEY_TRY_LDAP,
NULL, adsk_pk, name, NULL, NULL, 1);
if (err)