Page MenuHome GnuPG
Files F36623695

pkglue.c
No OneTemporary
Actions

pkglue.c
View Options

/* pkglue.c - public key operations glue code
* Copyright (C) 2000, 2003, 2010 Free Software Foundation, Inc.
*
* 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"
/* FIXME: Better chnage the fucntion name because mpi_ is used by
gcrypt macros. */
gcry_mpi_t
mpi_from_sexp (gcry_sexp_t sexp, const char * item)
{
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, 0);
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 (int algo, gcry_mpi_t hash, gcry_mpi_t *data, gcry_mpi_t *pkey)
{
gcry_sexp_t s_sig, s_hash, s_pkey;
int rc;
const int pkalgo = map_pk_openpgp_to_gcry (algo);
/* Make a sexp from pkey. */
if (pkalgo == GCRY_PK_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 == GCRY_PK_ELG || pkalgo == GCRY_PK_ELG_E)
{
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 == GCRY_PK_RSA || pkalgo == GCRY_PK_RSA_S)
{
rc = gcry_sexp_build (&s_pkey, NULL,
"(public-key(rsa(n%m)(e%m)))", pkey[0], pkey[1]);
}
else if (pkalgo == GCRY_PK_ECDSA) /* Same as GCRY_PK_ECDH */
{
rc = gcry_sexp_build (&s_pkey, NULL,
"(public-key(ecdsa(c%m)(q%m)))", pkey[0], pkey[1]);
}
else
return GPG_ERR_PUBKEY_ALGO;
if (rc)
BUG (); /* gcry_sexp_build should never fail. */
/* Put hash into a S-Exp s_hash. */
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 == GCRY_PK_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 == GCRY_PK_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 == GCRY_PK_ELG || pkalgo == GCRY_PK_ELG_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 == GCRY_PK_RSA || pkalgo == GCRY_PK_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.
*/
int
pk_encrypt (int algo, gcry_mpi_t *resarr, gcry_mpi_t data,
const byte pk_fp[MAX_FINGERPRINT_LEN], gcry_mpi_t *pkey)
{
gcry_sexp_t s_ciph, s_data, s_pkey;
int rc;
/* Make a sexp from pkey. */
if (algo == GCRY_PK_ELG || algo == GCRY_PK_ELG_E)
{
rc = gcry_sexp_build (&s_pkey, NULL,
"(public-key(elg(p%m)(g%m)(y%m)))",
pkey[0], pkey[1], pkey[2]);
}
else if (algo == GCRY_PK_RSA || algo == GCRY_PK_RSA_E)
{
rc = gcry_sexp_build (&s_pkey, NULL,
"(public-key(rsa(n%m)(e%m)))",
pkey[0], pkey[1]);
}
else if (algo == PUBKEY_ALGO_ECDH)
{
return pk_ecdh_encrypt (resarr, pk_fp, data, pkey);
}
else
return GPG_ERR_PUBKEY_ALGO;
if (rc)
BUG ();
/* Put the data into a simple list. */
if (gcry_sexp_build (&s_data, NULL, "%m", data))
BUG ();
/* Pass it to libgcrypt. */
rc = gcry_pk_encrypt (&s_ciph, s_data, s_pkey);
gcry_sexp_release (s_data);
gcry_sexp_release (s_pkey);
if (rc)
;
else
{ /* Add better error handling or make gnupg use S-Exp directly. */
resarr[0] = mpi_from_sexp (s_ciph, "a");
if (algo != GCRY_PK_RSA
&& algo != GCRY_PK_RSA_E
&& algo != PUBKEY_ALGO_ECDH)
resarr[1] = mpi_from_sexp (s_ciph, "b");
}
gcry_sexp_release (s_ciph);
return rc;
}
/* Check whether SKEY is a suitable secret key. */
int
pk_check_secret_key (int algo, gcry_mpi_t *skey)
{
gcry_sexp_t s_skey;
int rc;
const int gcry_pkalgo = map_pk_openpgp_to_gcry( algo );
if (gcry_pkalgo == GCRY_PK_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 (gcry_pkalgo == GCRY_PK_ELG || gcry_pkalgo == GCRY_PK_ELG_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 (gcry_pkalgo == GCRY_PK_RSA
|| gcry_pkalgo == GCRY_PK_RSA_S || gcry_pkalgo == GCRY_PK_RSA_E)
{
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 (gcry_pkalgo == GCRY_PK_ECDSA || gcry_pkalgo == GCRY_PK_ECDH)
{
rc = gcry_sexp_build (&s_skey, NULL,
"(private-key(ecdsa(c%m)(q%m)(d%m)))",
skey[0], skey[1], skey[2] );
}
else
return GPG_ERR_PUBKEY_ALGO;
if (!rc)
{
rc = gcry_pk_testkey (s_skey);
gcry_sexp_release (s_skey);
}
return rc;
}

File Metadata

Mime Type
text/x-c
Expires
Thu, Feb 26, 6:57 PM (1 d, 19 h)
Storage Engine
local-disk
Storage Format
Raw Data
Storage Handle
9c/b1/e6320f82f3089486574a943603d2

Event Timeline