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/*
* 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 <datum.h>
#include <global.h>
#include "errors.h"
#include <common.h>
#include <x509.h>
#include <x509_int.h>
#include <mpi.h>
#include "prov-seed.h"
/* This function encodes a seed value and a hash algorithm OID to the format
* described in RFC8479. The output is the DER encoded form.
*/
int _x509_encode_provable_seed(gnutls_x509_privkey_t pkey, gnutls_datum_t *der)
{
asn1_node c2;
int ret, result;
const char *oid;
oid = gnutls_digest_get_oid(pkey->params.palgo);
if (oid == NULL)
return gnutls_assert_val(GNUTLS_E_INVALID_REQUEST);
if ((result = asn1_create_element(_gnutls_get_gnutls_asn(),
"GNUTLS.ProvableSeed", &c2)) !=
ASN1_SUCCESS) {
gnutls_assert();
return _gnutls_asn2err(result);
}
result = asn1_write_value(c2, "seed", pkey->params.seed,
pkey->params.seed_size);
if (result != ASN1_SUCCESS) {
gnutls_assert();
ret = _gnutls_asn2err(result);
goto cleanup;
}
result = asn1_write_value(c2, "algorithm", oid, 1);
if (result != ASN1_SUCCESS) {
gnutls_assert();
ret = _gnutls_asn2err(result);
goto cleanup;
}
ret = _gnutls_x509_der_encode(c2, "", der, 0);
if (ret < 0) {
gnutls_assert();
goto cleanup;
}
ret = 0;
cleanup:
asn1_delete_structure2(&c2, ASN1_DELETE_FLAG_ZEROIZE);
return ret;
}
/* This function decodes a DER encoded form of seed and a hash algorithm, as in
* RFC8479.
*/
int _x509_decode_provable_seed(gnutls_x509_privkey_t pkey,
const gnutls_datum_t *der)
{
asn1_node c2;
int ret, result;
char oid[MAX_OID_SIZE];
int oid_size;
gnutls_datum_t seed = { NULL, 0 };
if ((result = asn1_create_element(_gnutls_get_gnutls_asn(),
"GNUTLS.ProvableSeed", &c2)) !=
ASN1_SUCCESS) {
gnutls_assert();
return _gnutls_asn2err(result);
}
result = _asn1_strict_der_decode(&c2, der->data, der->size, NULL);
if (result != ASN1_SUCCESS) {
gnutls_assert();
ret = _gnutls_asn2err(result);
goto cleanup;
}
ret = _gnutls_x509_read_value(c2, "seed", &seed);
if (ret < 0) {
gnutls_assert();
goto cleanup;
}
if (seed.size <= sizeof(pkey->params.seed)) {
memcpy(pkey->params.seed, seed.data, seed.size);
pkey->params.seed_size = seed.size;
} else {
ret = 0; /* ignore struct */
_gnutls_debug_log(
"%s: ignoring ProvableSeed due to very long params\n",
__func__);
goto cleanup;
}
oid_size = sizeof(oid);
result = asn1_read_value(c2, "algorithm", oid, &oid_size);
if (result != ASN1_SUCCESS) {
gnutls_assert();
ret = _gnutls_asn2err(result);
goto cleanup;
}
pkey->params.palgo = gnutls_oid_to_digest(oid);
pkey->params.pkflags |= GNUTLS_PK_FLAG_PROVABLE;
ret = 0;
cleanup:
gnutls_free(seed.data);
asn1_delete_structure2(&c2, ASN1_DELETE_FLAG_ZEROIZE);
return ret;
}
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