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gpg: Allow to create a Kyber key from keygrips.

Browse source 
* agent/cvt-openpgp.c (extract_private_key): Support Kyber algorithms.
* common/openpgp-oid.c (map_gcry_pk_to_openpgp): Map KEM to Kyber.
* common/sexputil.c (get_pk_algo_from_key): Increase buffer for use
with "kyber1024".
* g10/call-agent.c (agent_get_keyinfo): Fix warning.
* g10/keygen.c (do_create_from_keygrip): Support Kyber.
(ask_algo): Ditto.
--

To test create a standard key and the use --edit-key and "addkey" with
selection 13 and use the comma delimited keygrips.

GnuPG-bug-id: 7014
This commit is contained in:
Werner Koch 2024-04-05 16:16:53 +02:00
parent 68d9bc9c35
commit 03d53c88cc
No known key found for this signature in database
GPG key ID: E3FDFF218E45B72B
6 changed files with 97 additions and 13 deletions
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92
g10/keygen.c
View file

@ -1,7 +1,7 @@
/* keygen.c - Generate a key pair
* Copyright (C) 1998-2007, 2009-2011 Free Software Foundation, Inc.
* Copyright (C) 2014, 2015, 2016, 2017, 2018 Werner Koch
* Copyright (C) 2020 g10 Code GmbH
* Copyright (C) 2020, 2024 g10 Code GmbH
*
* This file is part of GnuPG.
*
@ -1501,10 +1501,24 @@ do_create_from_keygrip (ctrl_t ctrl, int algo,
PACKET *pkt;
PKT_public_key *pk;
gcry_sexp_t s_key;
gcry_sexp_t s_key2 = NULL;
const char *algoelem;
char *hexkeygrip_buffer = NULL;
char *hexkeygrip2 = NULL;
if (hexkeygrip[0] == '&')
hexkeygrip++;
if (strchr (hexkeygrip, ','))
{
hexkeygrip_buffer = xtrystrdup (hexkeygrip);
if (!hexkeygrip_buffer)
return gpg_error_from_syserror ();
hexkeygrip = hexkeygrip_buffer;
hexkeygrip2 = strchr (hexkeygrip_buffer, ',');
if (hexkeygrip2)
*hexkeygrip2++ = 0;
}
switch (algo)
{
@ -1514,16 +1528,21 @@ do_create_from_keygrip (ctrl_t ctrl, int algo,
case PUBKEY_ALGO_ECDH:
case PUBKEY_ALGO_ECDSA: algoelem = ""; break;
case PUBKEY_ALGO_EDDSA: algoelem = ""; break;
default: return gpg_error (GPG_ERR_INTERNAL);
case PUBKEY_ALGO_KYBER: algoelem = ""; break;
default:
xfree (hexkeygrip_buffer);
return gpg_error (GPG_ERR_INTERNAL);
}
/* Ask the agent for the public key matching HEXKEYGRIP. */
if (cardkey)
{
err = agent_scd_readkey (ctrl, hexkeygrip, &s_key, NULL);
if (err)
return err;
{
xfree (hexkeygrip_buffer);
return err;
}
}
else
{
@ -1531,16 +1550,41 @@ do_create_from_keygrip (ctrl_t ctrl, int algo,
err = agent_readkey (ctrl, 0, hexkeygrip, &public);
if (err)
return err;
{
xfree (hexkeygrip_buffer);
return err;
}
err = gcry_sexp_sscan (&s_key, NULL, public,
gcry_sexp_canon_len (public, 0, NULL, NULL));
xfree (public);
if (err)
return err;
{
xfree (hexkeygrip_buffer);
return err;
}
if (hexkeygrip2)
{
err = agent_readkey (ctrl, 0, hexkeygrip2, &public);
if (err)
{
gcry_sexp_release (s_key);
xfree (hexkeygrip_buffer);
return err;
}
err = gcry_sexp_sscan (&s_key2, NULL, public,
gcry_sexp_canon_len (public, 0, NULL, NULL));
xfree (public);
if (err)
{
gcry_sexp_release (s_key);
xfree (hexkeygrip_buffer);
return err;
}
}
}
/* For X448 we force the use of v5 packets. */
if (curve_is_448 (s_key))
/* For X448 and Kyber we force the use of v5 packets. */
if (curve_is_448 (s_key) || algo == PUBKEY_ALGO_KYBER)
*keygen_flags |= KEYGEN_FLAG_CREATE_V5_KEY;
/* Build a public key packet. */
@ -1549,6 +1593,8 @@ do_create_from_keygrip (ctrl_t ctrl, int algo,
{
err = gpg_error_from_syserror ();
gcry_sexp_release (s_key);
gcry_sexp_release (s_key2);
xfree (hexkeygrip_buffer);
return err;
}
@ -1558,7 +1604,9 @@ do_create_from_keygrip (ctrl_t ctrl, int algo,
pk->expiredate = pk->timestamp + expireval;
pk->pubkey_algo = algo;
if (algo == PUBKEY_ALGO_ECDSA
if (algo == PUBKEY_ALGO_KYBER)
err = ecckey_from_sexp (pk->pkey, s_key, s_key2, algo);
else if (algo == PUBKEY_ALGO_ECDSA
|| algo == PUBKEY_ALGO_EDDSA
|| algo == PUBKEY_ALGO_ECDH )
err = ecckey_from_sexp (pk->pkey, s_key, NULL, algo);
@ -1568,16 +1616,20 @@ do_create_from_keygrip (ctrl_t ctrl, int algo,
{
log_error ("key_from_sexp failed: %s\n", gpg_strerror (err) );
gcry_sexp_release (s_key);
gcry_sexp_release (s_key2);
free_public_key (pk);
xfree (hexkeygrip_buffer);
return err;
}
gcry_sexp_release (s_key);
gcry_sexp_release (s_key2);
pkt = xtrycalloc (1, sizeof *pkt);
if (!pkt)
{
err = gpg_error_from_syserror ();
free_public_key (pk);
xfree (hexkeygrip_buffer);
return err;
}
@ -1585,6 +1637,7 @@ do_create_from_keygrip (ctrl_t ctrl, int algo,
pkt->pkt.public_key = pk;
add_kbnode (pub_root, new_kbnode (pkt));
xfree (hexkeygrip_buffer);
return 0;
}
@ -2479,7 +2532,26 @@ ask_algo (ctrl_t ctrl, int addmode, int *r_subkey_algo, unsigned int *r_usage,
continue;
}
if (strlen (answer) != 40 &&
if (strlen (answer) == 40+1+40 && answer[40]==',')
{
int algo1, algo2;
answer[40] = 0;
algo1 = check_keygrip (ctrl, answer);
algo2 = check_keygrip (ctrl, answer+41);
answer[40] = ',';
if (algo1 == PUBKEY_ALGO_ECDH && algo2 == PUBKEY_ALGO_KYBER)
{
algo = PUBKEY_ALGO_KYBER;
break;
}
else if (!algo1 || !algo2)
tty_printf (_("No key with this keygrip\n"));
else
tty_printf ("Invalid combination for dual algo (%d,%d)\n",
algo1, algo2);
}
else if (strlen (answer) != 40 &&
!(answer[0] == '&' && strlen (answer+1) == 40))
tty_printf
(_("Not a valid keygrip (expecting 40 hex digits)\n"));