security-and-privacy/gnupg
security-and-privacy/gnupg
1
0
Fork 0
mirror of git://git.gnupg.org/gnupg.git synced 2025-07-02 22:46:30 +02:00
Code Activity

gpg: New option --include-key-block.

Browse source 
* common/openpgpdefs.h (SIGSUBPKT_KEY_BLOCK): New.
* g10/gpg.c (oIncludeKeyBlock): New.
(opts): New option --include-key-block.
(main): Implement.
* g10/options.h (opt): New flag include_key_block.
* g10/parse-packet.c (dump_sig_subpkt): Support SIGSUBPKT_KEY_BLOCK.
(parse_one_sig_subpkt): Ditto.
(can_handle_critical): Ditto.
* g10/sign.c (mk_sig_subpkt_key_block): New.
(write_signature_packets): Call it for data signatures.
--

This patch adds support for a to be proposed OpenPGP ferature:

  Introduce the Key Block subpacket to align OpenPGP with CMS.

  This new subpacket may be used similar to the CertificateSet of
  CMS (RFC-5652) and thus allows to start encrypted communication
  after having received a signed message.  In practice a stripped down
  version of the key should be including having only the key material
  and the self-signatures which are really useful and shall be used by
  the recipient to reply encrypted.

  #### Key Block

  (1 octet with value 0, N octets of key data)

  This subpacket MAY be used to convey key data along with a signature
  of class 0x00, 0x01, or 0x02.  It MUST contain the key used to create
  the signature; either as the primary key or as a subkey.  The key
  SHOULD contain a primary or subkey capable of encryption and the
  entire key must be a valid OpenPGP key including at least one User ID
  packet and the corresponding self-signatures.

  Implementations MUST ignore this subpacket if the first octet does not
  have a value of zero or if the key data does not represent a valid
  transferable public key.

GnuPG-bug-id: 4856
Signed-off-by: Werner Koch <wk@gnupg.org>

Backported from master.

Signed-off-by: Werner Koch <wk@gnupg.org>
This commit is contained in:
Werner Koch 2020-03-13 13:28:35 +01:00
parent 2baa00ea18
commit d79ebee64e
No known key found for this signature in database
GPG key ID: E3FDFF218E45B72B
6 changed files with 147 additions and 11 deletions
Download patch file Download diff file Expand all files Collapse all files

10
doc/gpg.texi
View file

@ -2664,6 +2664,16 @@ As of now this is only done if the signing key has been specified with
information can be helpful for verifier to locate the key; see option
@option{--auto-key-retrieve}.
@item --include-key-block
@opindex include-key-block
This option is used to embed the actual signing key into a data
signature. The embedded key is stripped down to a single user id and
includes only the signing subkey used to create the signature as well
as as valid encryption subkeys. All other info is removed from the
key to keep it and thus the signature small. This option is the
OpenPGP counterpart to the @command{gpgsm} option
@option{--include-certs}.
@item --personal-cipher-preferences @var{string}
@opindex personal-cipher-preferences
Set the list of personal cipher preferences to @var{string}. Use