/*
* Copyright (C) 2017 Red Hat, Inc.
*
* Author: Nikos Mavrogiannopoulos
*
* This file is part of GnuTLS.
*
* The GnuTLS is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>
*
*/
#include "gnutls_int.h"
#include <algorithms.h>
#include "errors.h"
#include <x509/common.h>
#include <pk.h>
#include "c-strcase.h"
/* Supported ECC curves
*/
static const gnutls_group_entry_st supported_groups[] = {
{
.name = "SECP192R1",
.id = GNUTLS_GROUP_SECP192R1,
.curve = GNUTLS_ECC_CURVE_SECP192R1,
.tls_id = 19,
.pk = GNUTLS_PK_ECDSA,
},
{
.name = "SECP224R1",
.id = GNUTLS_GROUP_SECP224R1,
.curve = GNUTLS_ECC_CURVE_SECP224R1,
.tls_id = 21,
.pk = GNUTLS_PK_ECDSA,
},
{
.name = "SECP256R1",
.id = GNUTLS_GROUP_SECP256R1,
.curve = GNUTLS_ECC_CURVE_SECP256R1,
.tls_id = 23,
.pk = GNUTLS_PK_ECDSA,
},
{
.name = "SECP384R1",
.id = GNUTLS_GROUP_SECP384R1,
.curve = GNUTLS_ECC_CURVE_SECP384R1,
.tls_id = 24,
.pk = GNUTLS_PK_ECDSA,
},
{
.name = "SECP521R1",
.id = GNUTLS_GROUP_SECP521R1,
.curve = GNUTLS_ECC_CURVE_SECP521R1,
.tls_id = 25,
.pk = GNUTLS_PK_ECDSA,
},
{
.name = "X25519",
.id = GNUTLS_GROUP_X25519,
.curve = GNUTLS_ECC_CURVE_X25519,
.tls_id = 29,
.pk = GNUTLS_PK_ECDH_X25519
},
#ifdef ENABLE_GOST
/* draft-smyshlyaev-tls12-gost-suites-06, Section 6 */
{
.name = "GC256A",
.id = GNUTLS_GROUP_GC256A,
.curve = GNUTLS_ECC_CURVE_GOST256A,
.pk = GNUTLS_PK_GOST_12_256,
.tls_id = 34,
},
{
.name = "GC256B",
.id = GNUTLS_GROUP_GC256B,
.curve = GNUTLS_ECC_CURVE_GOST256B,
.pk = GNUTLS_PK_GOST_12_256,
.tls_id = 35,
},
{
.name = "GC256C",
.id = GNUTLS_GROUP_GC256C,
.curve = GNUTLS_ECC_CURVE_GOST256C,
.pk = GNUTLS_PK_GOST_12_256,
.tls_id = 36,
},
{
.name = "GC256D",
.id = GNUTLS_GROUP_GC256D,
.curve = GNUTLS_ECC_CURVE_GOST256D,
.pk = GNUTLS_PK_GOST_12_256,
.tls_id = 37,
},
{
.name = "GC512A",
.id = GNUTLS_GROUP_GC512A,
.curve = GNUTLS_ECC_CURVE_GOST512A,
.pk = GNUTLS_PK_GOST_12_512,
.tls_id = 38,
},
{
.name = "GC512B",
.id = GNUTLS_GROUP_GC512B,
.curve = GNUTLS_ECC_CURVE_GOST512B,
.pk = GNUTLS_PK_GOST_12_512,
.tls_id = 39,
},
{
.name = "GC512C",
.id = GNUTLS_GROUP_GC512C,
.curve = GNUTLS_ECC_CURVE_GOST512C,
.pk = GNUTLS_PK_GOST_12_512,
.tls_id = 40,
},
#endif
{
.name = "X448",
.id = GNUTLS_GROUP_X448,
.curve = GNUTLS_ECC_CURVE_X448,
.tls_id = 30,
.pk = GNUTLS_PK_ECDH_X448
},
#ifdef ENABLE_DHE
{
.name = "FFDHE2048",
.id = GNUTLS_GROUP_FFDHE2048,
.generator = &gnutls_ffdhe_2048_group_generator,
.prime = &gnutls_ffdhe_2048_group_prime,
.q = &gnutls_ffdhe_2048_group_q,
.q_bits = &gnutls_ffdhe_2048_key_bits,
.pk = GNUTLS_PK_DH,
.tls_id = 0x100
},
{
.name = "FFDHE3072",
.id = GNUTLS_GROUP_FFDHE3072,
.generator = &gnutls_ffdhe_3072_group_generator,
.prime = &gnutls_ffdhe_3072_group_prime,
.q = &gnutls_ffdhe_3072_group_q,
.q_bits = &gnutls_ffdhe_3072_key_bits,
.pk = GNUTLS_PK_DH,
.tls_id = 0x101
},
{
.name = "FFDHE4096",
.id = GNUTLS_GROUP_FFDHE4096,
.generator = &gnutls_ffdhe_4096_group_generator,
.prime = &gnutls_ffdhe_4096_group_prime,
.q = &gnutls_ffdhe_4096_group_q,
.q_bits = &gnutls_ffdhe_4096_key_bits,
.pk = GNUTLS_PK_DH,
.tls_id = 0x102
},
{
.name = "FFDHE6144",
.id = GNUTLS_GROUP_FFDHE6144,
.generator = &gnutls_ffdhe_6144_group_generator,
.prime = &gnutls_ffdhe_6144_group_prime,
.q = &gnutls_ffdhe_6144_group_q,
.q_bits = &gnutls_ffdhe_6144_key_bits,
.pk = GNUTLS_PK_DH,
.tls_id = 0x103
},
{
.name = "FFDHE8192",
.id = GNUTLS_GROUP_FFDHE8192,
.generator = &gnutls_ffdhe_8192_group_generator,
.prime = &gnutls_ffdhe_8192_group_prime,
.q = &gnutls_ffdhe_8192_group_q,
.q_bits = &gnutls_ffdhe_8192_key_bits,
.pk = GNUTLS_PK_DH,
.tls_id = 0x104
},
#endif
{0, 0, 0}
};
#define GNUTLS_GROUP_LOOP(b) \
{ const gnutls_group_entry_st *p; \
for(p = supported_groups; p->name != NULL; p++) { b ; } }
/* Returns the TLS id of the given curve
*/
const gnutls_group_entry_st * _gnutls_tls_id_to_group(unsigned num)
{
GNUTLS_GROUP_LOOP(
if (p->tls_id == num &&
(p->curve == 0 || _gnutls_ecc_curve_is_supported(p->curve))) {
return p;
}
);
return NULL;
}
const gnutls_group_entry_st * _gnutls_id_to_group(unsigned id)
{
if (id == 0)
return NULL;
GNUTLS_GROUP_LOOP(
if (p->id == id &&
(p->curve == 0 || _gnutls_ecc_curve_is_supported(p->curve))) {
return p;
}
);
return NULL;
}
/**
* gnutls_group_list:
*
* Get the list of supported elliptic curves.
*
* This function is not thread safe.
*
* Returns: Return a (0)-terminated list of #gnutls_group_t
* integers indicating the available groups.
*
* Since: 3.6.0
**/
const gnutls_group_t *gnutls_group_list(void)
{
static gnutls_group_t groups[MAX_ALGOS] = { 0 };
if (groups[0] == 0) {
int i = 0;
GNUTLS_GROUP_LOOP(
if (p->curve == 0 || _gnutls_ecc_curve_is_supported(p->curve))
groups[i++] = p->id;
);
groups[i++] = 0;
}
return groups;
}
/**
* gnutls_group_get_id:
* @name: is a group name
*
* The names are compared in a case insensitive way.
*
* Returns: return a #gnutls_group_t value corresponding to
* the specified group, or %GNUTLS_GROUP_INVALID on error.
*
* Since: 3.6.0
**/
gnutls_group_t gnutls_group_get_id(const char *name)
{
gnutls_group_t ret = GNUTLS_GROUP_INVALID;
GNUTLS_GROUP_LOOP(
if (c_strcasecmp(p->name, name) == 0 && (
p->curve == 0 ||_gnutls_ecc_curve_is_supported(p->curve))) {
ret = p->id;
break;
}
);
return ret;
}
/**
* gnutls_group_get_name:
* @group: is an element from %gnutls_group_t
*
* Convert a #gnutls_group_t value to a string.
*
* Returns: a string that contains the name of the specified
* group or %NULL.
*
* Since: 3.6.0
**/
const char *gnutls_group_get_name(gnutls_group_t group)
{
GNUTLS_GROUP_LOOP(
if (p->id == group) {
return p->name;
}
);
return NULL;
}