mirror of
git://git.gnupg.org/gnupg.git
synced 2024-12-23 10:29:58 +01:00
4de8a58e44
* g10/options.h (DBG_CIPHER_VALUE): Rename to DBG_CRYPTO_VALUE. (DBG_CIPHER): Rename to DBG_CRYPTO.
368 lines
10 KiB
C
368 lines
10 KiB
C
/* pkglue.c - public key operations glue code
|
|
* Copyright (C) 2000, 2003, 2010 Free Software Foundation, Inc.
|
|
* Copyright (C) 2014 Werner Koch
|
|
*
|
|
* This file is part of GnuPG.
|
|
*
|
|
* GnuPG is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 3 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* GnuPG is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#include <config.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <errno.h>
|
|
#include <assert.h>
|
|
|
|
#include "gpg.h"
|
|
#include "util.h"
|
|
#include "pkglue.h"
|
|
#include "main.h"
|
|
#include "options.h"
|
|
|
|
/* FIXME: Better chnage the fucntion name because mpi_ is used by
|
|
gcrypt macros. */
|
|
gcry_mpi_t
|
|
get_mpi_from_sexp (gcry_sexp_t sexp, const char *item, int mpifmt)
|
|
{
|
|
gcry_sexp_t list;
|
|
gcry_mpi_t data;
|
|
|
|
list = gcry_sexp_find_token (sexp, item, 0);
|
|
assert (list);
|
|
data = gcry_sexp_nth_mpi (list, 1, mpifmt);
|
|
assert (data);
|
|
gcry_sexp_release (list);
|
|
return data;
|
|
}
|
|
|
|
|
|
|
|
/****************
|
|
* Emulate our old PK interface here - sometime in the future we might
|
|
* change the internal design to directly fit to libgcrypt.
|
|
*/
|
|
int
|
|
pk_verify (pubkey_algo_t pkalgo, gcry_mpi_t hash,
|
|
gcry_mpi_t *data, gcry_mpi_t *pkey)
|
|
{
|
|
gcry_sexp_t s_sig, s_hash, s_pkey;
|
|
int rc;
|
|
|
|
/* Make a sexp from pkey. */
|
|
if (pkalgo == PUBKEY_ALGO_DSA)
|
|
{
|
|
rc = gcry_sexp_build (&s_pkey, NULL,
|
|
"(public-key(dsa(p%m)(q%m)(g%m)(y%m)))",
|
|
pkey[0], pkey[1], pkey[2], pkey[3]);
|
|
}
|
|
else if (pkalgo == PUBKEY_ALGO_ELGAMAL_E || pkalgo == PUBKEY_ALGO_ELGAMAL)
|
|
{
|
|
rc = gcry_sexp_build (&s_pkey, NULL,
|
|
"(public-key(elg(p%m)(g%m)(y%m)))",
|
|
pkey[0], pkey[1], pkey[2]);
|
|
}
|
|
else if (pkalgo == PUBKEY_ALGO_RSA || pkalgo == PUBKEY_ALGO_RSA_S)
|
|
{
|
|
rc = gcry_sexp_build (&s_pkey, NULL,
|
|
"(public-key(rsa(n%m)(e%m)))", pkey[0], pkey[1]);
|
|
}
|
|
else if (pkalgo == PUBKEY_ALGO_ECDSA)
|
|
{
|
|
char *curve = openpgp_oid_to_str (pkey[0]);
|
|
if (!curve)
|
|
rc = gpg_error_from_syserror ();
|
|
else
|
|
{
|
|
rc = gcry_sexp_build (&s_pkey, NULL,
|
|
"(public-key(ecdsa(curve %s)(q%m)))",
|
|
curve, pkey[1]);
|
|
xfree (curve);
|
|
}
|
|
}
|
|
else if (pkalgo == PUBKEY_ALGO_EDDSA)
|
|
{
|
|
char *curve = openpgp_oid_to_str (pkey[0]);
|
|
if (!curve)
|
|
rc = gpg_error_from_syserror ();
|
|
else
|
|
{
|
|
rc = gcry_sexp_build (&s_pkey, NULL,
|
|
"(public-key(ecc(curve %s)"
|
|
"(flags eddsa)(q%m)))",
|
|
curve, pkey[1]);
|
|
xfree (curve);
|
|
}
|
|
}
|
|
else
|
|
return GPG_ERR_PUBKEY_ALGO;
|
|
|
|
if (rc)
|
|
BUG (); /* gcry_sexp_build should never fail. */
|
|
|
|
/* Put hash into a S-Exp s_hash. */
|
|
if (pkalgo == PUBKEY_ALGO_EDDSA)
|
|
{
|
|
if (gcry_sexp_build (&s_hash, NULL,
|
|
"(data(flags eddsa)(hash-algo sha512)(value %m))",
|
|
hash))
|
|
BUG (); /* gcry_sexp_build should never fail. */
|
|
}
|
|
else
|
|
{
|
|
if (gcry_sexp_build (&s_hash, NULL, "%m", hash))
|
|
BUG (); /* gcry_sexp_build should never fail. */
|
|
}
|
|
|
|
/* Put data into a S-Exp s_sig. */
|
|
s_sig = NULL;
|
|
if (pkalgo == PUBKEY_ALGO_DSA)
|
|
{
|
|
if (!data[0] || !data[1])
|
|
rc = gpg_error (GPG_ERR_BAD_MPI);
|
|
else
|
|
rc = gcry_sexp_build (&s_sig, NULL,
|
|
"(sig-val(dsa(r%m)(s%m)))", data[0], data[1]);
|
|
}
|
|
else if (pkalgo == PUBKEY_ALGO_ECDSA)
|
|
{
|
|
if (!data[0] || !data[1])
|
|
rc = gpg_error (GPG_ERR_BAD_MPI);
|
|
else
|
|
rc = gcry_sexp_build (&s_sig, NULL,
|
|
"(sig-val(ecdsa(r%m)(s%m)))", data[0], data[1]);
|
|
}
|
|
else if (pkalgo == PUBKEY_ALGO_EDDSA)
|
|
{
|
|
if (!data[0] || !data[1])
|
|
rc = gpg_error (GPG_ERR_BAD_MPI);
|
|
else
|
|
rc = gcry_sexp_build (&s_sig, NULL,
|
|
"(sig-val(eddsa(r%M)(s%M)))", data[0], data[1]);
|
|
}
|
|
else if (pkalgo == PUBKEY_ALGO_ELGAMAL || pkalgo == PUBKEY_ALGO_ELGAMAL_E)
|
|
{
|
|
if (!data[0] || !data[1])
|
|
rc = gpg_error (GPG_ERR_BAD_MPI);
|
|
else
|
|
rc = gcry_sexp_build (&s_sig, NULL,
|
|
"(sig-val(elg(r%m)(s%m)))", data[0], data[1]);
|
|
}
|
|
else if (pkalgo == PUBKEY_ALGO_RSA || pkalgo == PUBKEY_ALGO_RSA_S)
|
|
{
|
|
if (!data[0])
|
|
rc = gpg_error (GPG_ERR_BAD_MPI);
|
|
else
|
|
rc = gcry_sexp_build (&s_sig, NULL, "(sig-val(rsa(s%m)))", data[0]);
|
|
}
|
|
else
|
|
BUG ();
|
|
|
|
if (!rc)
|
|
rc = gcry_pk_verify (s_sig, s_hash, s_pkey);
|
|
|
|
gcry_sexp_release (s_sig);
|
|
gcry_sexp_release (s_hash);
|
|
gcry_sexp_release (s_pkey);
|
|
return rc;
|
|
}
|
|
|
|
|
|
|
|
|
|
/****************
|
|
* Emulate our old PK interface here - sometime in the future we might
|
|
* change the internal design to directly fit to libgcrypt.
|
|
* PK is only required to compute the fingerprint for ECDH.
|
|
*/
|
|
int
|
|
pk_encrypt (pubkey_algo_t algo, gcry_mpi_t *resarr, gcry_mpi_t data,
|
|
PKT_public_key *pk, gcry_mpi_t *pkey)
|
|
{
|
|
gcry_sexp_t s_ciph = NULL;
|
|
gcry_sexp_t s_data = NULL;
|
|
gcry_sexp_t s_pkey = NULL;
|
|
int rc;
|
|
|
|
/* Make a sexp from pkey. */
|
|
if (algo == PUBKEY_ALGO_ELGAMAL || algo == PUBKEY_ALGO_ELGAMAL_E)
|
|
{
|
|
rc = gcry_sexp_build (&s_pkey, NULL,
|
|
"(public-key(elg(p%m)(g%m)(y%m)))",
|
|
pkey[0], pkey[1], pkey[2]);
|
|
/* Put DATA into a simplified S-expression. */
|
|
if (!rc)
|
|
rc = gcry_sexp_build (&s_data, NULL, "%m", data);
|
|
}
|
|
else if (algo == PUBKEY_ALGO_RSA || algo == PUBKEY_ALGO_RSA_E)
|
|
{
|
|
rc = gcry_sexp_build (&s_pkey, NULL,
|
|
"(public-key(rsa(n%m)(e%m)))",
|
|
pkey[0], pkey[1]);
|
|
/* Put DATA into a simplified S-expression. */
|
|
if (!rc)
|
|
rc = gcry_sexp_build (&s_data, NULL, "%m", data);
|
|
}
|
|
else if (algo == PUBKEY_ALGO_ECDH)
|
|
{
|
|
gcry_mpi_t k;
|
|
|
|
rc = pk_ecdh_generate_ephemeral_key (pkey, &k);
|
|
if (!rc)
|
|
{
|
|
char *curve;
|
|
|
|
curve = openpgp_oid_to_str (pkey[0]);
|
|
if (!curve)
|
|
rc = gpg_error_from_syserror ();
|
|
else
|
|
{
|
|
/* Now use the ephemeral secret to compute the shared point. */
|
|
rc = gcry_sexp_build (&s_pkey, NULL,
|
|
"(public-key(ecdh(curve%s)(q%m)))",
|
|
curve, pkey[1]);
|
|
xfree (curve);
|
|
/* Put K into a simplified S-expression. */
|
|
if (!rc)
|
|
rc = gcry_sexp_build (&s_data, NULL, "%m", k);
|
|
}
|
|
gcry_mpi_release (k);
|
|
}
|
|
}
|
|
else
|
|
rc = gpg_error (GPG_ERR_PUBKEY_ALGO);
|
|
|
|
/* Pass it to libgcrypt. */
|
|
if (!rc)
|
|
rc = gcry_pk_encrypt (&s_ciph, s_data, s_pkey);
|
|
|
|
gcry_sexp_release (s_data);
|
|
gcry_sexp_release (s_pkey);
|
|
|
|
if (rc)
|
|
;
|
|
else if (algo == PUBKEY_ALGO_ECDH)
|
|
{
|
|
gcry_mpi_t shared, public, result;
|
|
byte fp[MAX_FINGERPRINT_LEN];
|
|
size_t fpn;
|
|
|
|
/* Get the shared point and the ephemeral public key. */
|
|
shared = get_mpi_from_sexp (s_ciph, "s", GCRYMPI_FMT_USG);
|
|
public = get_mpi_from_sexp (s_ciph, "e", GCRYMPI_FMT_USG);
|
|
gcry_sexp_release (s_ciph);
|
|
s_ciph = NULL;
|
|
if (DBG_CRYPTO)
|
|
{
|
|
log_debug ("ECDH ephemeral key:");
|
|
gcry_mpi_dump (public);
|
|
log_printf ("\n");
|
|
}
|
|
|
|
result = NULL;
|
|
fingerprint_from_pk (pk, fp, &fpn);
|
|
if (fpn != 20)
|
|
rc = gpg_error (GPG_ERR_INV_LENGTH);
|
|
else
|
|
rc = pk_ecdh_encrypt_with_shared_point (1 /*=encrypton*/, shared,
|
|
fp, data, pkey, &result);
|
|
gcry_mpi_release (shared);
|
|
if (!rc)
|
|
{
|
|
resarr[0] = public;
|
|
resarr[1] = result;
|
|
}
|
|
else
|
|
{
|
|
gcry_mpi_release (public);
|
|
gcry_mpi_release (result);
|
|
}
|
|
}
|
|
else /* Elgamal or RSA case. */
|
|
{ /* Fixme: Add better error handling or make gnupg use
|
|
S-expressions directly. */
|
|
resarr[0] = get_mpi_from_sexp (s_ciph, "a", GCRYMPI_FMT_USG);
|
|
if (!is_RSA (algo))
|
|
resarr[1] = get_mpi_from_sexp (s_ciph, "b", GCRYMPI_FMT_USG);
|
|
}
|
|
|
|
gcry_sexp_release (s_ciph);
|
|
return rc;
|
|
}
|
|
|
|
|
|
/* Check whether SKEY is a suitable secret key. */
|
|
int
|
|
pk_check_secret_key (pubkey_algo_t pkalgo, gcry_mpi_t *skey)
|
|
{
|
|
gcry_sexp_t s_skey;
|
|
int rc;
|
|
|
|
if (pkalgo == PUBKEY_ALGO_DSA)
|
|
{
|
|
rc = gcry_sexp_build (&s_skey, NULL,
|
|
"(private-key(dsa(p%m)(q%m)(g%m)(y%m)(x%m)))",
|
|
skey[0], skey[1], skey[2], skey[3], skey[4]);
|
|
}
|
|
else if (pkalgo == PUBKEY_ALGO_ELGAMAL || pkalgo == PUBKEY_ALGO_ELGAMAL_E)
|
|
{
|
|
rc = gcry_sexp_build (&s_skey, NULL,
|
|
"(private-key(elg(p%m)(g%m)(y%m)(x%m)))",
|
|
skey[0], skey[1], skey[2], skey[3]);
|
|
}
|
|
else if (is_RSA (pkalgo))
|
|
{
|
|
rc = gcry_sexp_build (&s_skey, NULL,
|
|
"(private-key(rsa(n%m)(e%m)(d%m)(p%m)(q%m)(u%m)))",
|
|
skey[0], skey[1], skey[2], skey[3], skey[4],
|
|
skey[5]);
|
|
}
|
|
else if (pkalgo == PUBKEY_ALGO_ECDSA || pkalgo == PUBKEY_ALGO_ECDH)
|
|
{
|
|
char *curve = openpgp_oid_to_str (skey[0]);
|
|
if (!curve)
|
|
rc = gpg_error_from_syserror ();
|
|
else
|
|
{
|
|
rc = gcry_sexp_build (&s_skey, NULL,
|
|
"(private-key(ecc(curve%s)(q%m)(d%m)))",
|
|
curve, skey[1], skey[2]);
|
|
xfree (curve);
|
|
}
|
|
}
|
|
else if (pkalgo == PUBKEY_ALGO_EDDSA)
|
|
{
|
|
char *curve = openpgp_oid_to_str (skey[0]);
|
|
if (!curve)
|
|
rc = gpg_error_from_syserror ();
|
|
else
|
|
{
|
|
rc = gcry_sexp_build (&s_skey, NULL,
|
|
"(private-key(ecc(curve %s)"
|
|
"(flags eddsa)(q%m)(d%m)))",
|
|
curve, skey[1], skey[2]);
|
|
xfree (curve);
|
|
}
|
|
}
|
|
else
|
|
return GPG_ERR_PUBKEY_ALGO;
|
|
|
|
if (!rc)
|
|
{
|
|
rc = gcry_pk_testkey (s_skey);
|
|
gcry_sexp_release (s_skey);
|
|
}
|
|
return rc;
|
|
}
|