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/*
* Copyright 2020-2022 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
#include <openssl/core_names.h>
#include "internal/ffc.h"
#include "internal/sizes.h"
/*
* The intention with the "backend" source file is to offer backend support
* for legacy backends (EVP_PKEY_ASN1_METHOD and EVP_PKEY_METHOD) and provider
* implementations alike.
*/
int ossl_ffc_params_fromdata(FFC_PARAMS *ffc, const OSSL_PARAM params[])
{
const OSSL_PARAM *prm;
const OSSL_PARAM *param_p, *param_q, *param_g;
BIGNUM *p = NULL, *q = NULL, *g = NULL, *j = NULL;
int i;
prm = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_GROUP_NAME);
if (prm != NULL) {
/*
* In a no-dh build we just go straight to err because we have no
* support for this.
*/
#ifndef OPENSSL_NO_DH
const DH_NAMED_GROUP *group = NULL;
if (prm->data_type != OSSL_PARAM_UTF8_STRING
|| prm->data == NULL
|| (group = ossl_ffc_name_to_dh_named_group(prm->data)) == NULL
|| !ossl_ffc_named_group_set(ffc, group))
#endif
goto err;
}
param_p = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_P);
param_g = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_G);
param_q = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_Q);
if ((param_p != NULL && !OSSL_PARAM_get_BN(param_p, &p))
|| (param_q != NULL && !OSSL_PARAM_get_BN(param_q, &q))
|| (param_g != NULL && !OSSL_PARAM_get_BN(param_g, &g)))
goto err;
prm = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_GINDEX);
if (prm != NULL) {
if (!OSSL_PARAM_get_int(prm, &i))
goto err;
ffc->gindex = i;
}
prm = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_PCOUNTER);
if (prm != NULL) {
if (!OSSL_PARAM_get_int(prm, &i))
goto err;
ffc->pcounter = i;
}
prm = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_COFACTOR);
if (prm != NULL && !OSSL_PARAM_get_BN(prm, &j))
goto err;
prm = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_H);
if (prm != NULL) {
if (!OSSL_PARAM_get_int(prm, &i))
goto err;
ffc->h = i;
}
prm = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_SEED);
if (prm != NULL) {
if (prm->data_type != OSSL_PARAM_OCTET_STRING
|| !ossl_ffc_params_set_seed(ffc, prm->data, prm->data_size))
goto err;
}
prm = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_VALIDATE_PQ);
if (prm != NULL) {
if (!OSSL_PARAM_get_int(prm, &i))
goto err;
ossl_ffc_params_enable_flags(ffc, FFC_PARAM_FLAG_VALIDATE_PQ, i);
}
prm = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_VALIDATE_G);
if (prm != NULL) {
if (!OSSL_PARAM_get_int(prm, &i))
goto err;
ossl_ffc_params_enable_flags(ffc, FFC_PARAM_FLAG_VALIDATE_G, i);
}
prm = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_VALIDATE_LEGACY);
if (prm != NULL) {
if (!OSSL_PARAM_get_int(prm, &i))
goto err;
ossl_ffc_params_enable_flags(ffc, FFC_PARAM_FLAG_VALIDATE_LEGACY, i);
}
prm = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_DIGEST);
if (prm != NULL) {
const OSSL_PARAM *p1;
const char *props = NULL;
if (prm->data_type != OSSL_PARAM_UTF8_STRING)
goto err;
p1 = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_DIGEST_PROPS);
if (p1 != NULL) {
if (p1->data_type != OSSL_PARAM_UTF8_STRING)
goto err;
props = p1->data;
}
ossl_ffc_set_digest(ffc, prm->data, props);
}
ossl_ffc_params_set0_pqg(ffc, p, q, g);
ossl_ffc_params_set0_j(ffc, j);
return 1;
err:
BN_free(j);
BN_free(p);
BN_free(q);
BN_free(g);
return 0;
}
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