1/*
2 * Copyright 2020-2023 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the Apache License 2.0 (the "License").  You may not use
5 * this file except in compliance with the License.  You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
8 */
9
10#include <openssl/core_names.h>
11#include "internal/ffc.h"
12#include "internal/sizes.h"
13
14/*
15 * The intention with the "backend" source file is to offer backend support
16 * for legacy backends (EVP_PKEY_ASN1_METHOD and EVP_PKEY_METHOD) and provider
17 * implementations alike.
18 */
19
20int ossl_ffc_params_fromdata(FFC_PARAMS *ffc, const OSSL_PARAM params[])
21{
22    const OSSL_PARAM *prm;
23    const OSSL_PARAM *param_p, *param_q, *param_g;
24    BIGNUM *p = NULL, *q = NULL, *g = NULL, *j = NULL;
25    int i;
26
27    if (ffc == NULL)
28        return 0;
29
30    prm  = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_GROUP_NAME);
31    if (prm != NULL) {
32        /*
33         * In a no-dh build we just go straight to err because we have no
34         * support for this.
35         */
36#ifndef OPENSSL_NO_DH
37        const DH_NAMED_GROUP *group = NULL;
38
39        if (prm->data_type != OSSL_PARAM_UTF8_STRING
40            || prm->data == NULL
41            || (group = ossl_ffc_name_to_dh_named_group(prm->data)) == NULL
42            || !ossl_ffc_named_group_set(ffc, group))
43#endif
44            goto err;
45    }
46
47    param_p = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_P);
48    param_g = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_G);
49    param_q = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_Q);
50
51    if ((param_p != NULL && !OSSL_PARAM_get_BN(param_p, &p))
52        || (param_q != NULL && !OSSL_PARAM_get_BN(param_q, &q))
53        || (param_g != NULL && !OSSL_PARAM_get_BN(param_g, &g)))
54        goto err;
55
56    prm = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_GINDEX);
57    if (prm != NULL) {
58        if (!OSSL_PARAM_get_int(prm, &i))
59            goto err;
60        ffc->gindex =  i;
61    }
62    prm = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_PCOUNTER);
63    if (prm != NULL) {
64        if (!OSSL_PARAM_get_int(prm, &i))
65            goto err;
66        ffc->pcounter = i;
67    }
68    prm = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_COFACTOR);
69    if (prm != NULL && !OSSL_PARAM_get_BN(prm, &j))
70        goto err;
71    prm = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_H);
72    if (prm != NULL) {
73        if (!OSSL_PARAM_get_int(prm, &i))
74            goto err;
75        ffc->h =  i;
76    }
77    prm  = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_SEED);
78    if (prm != NULL) {
79        if (prm->data_type != OSSL_PARAM_OCTET_STRING)
80            goto err;
81        if (!ossl_ffc_params_set_seed(ffc, prm->data, prm->data_size))
82            goto err;
83    }
84    prm  = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_VALIDATE_PQ);
85    if (prm != NULL) {
86        if (!OSSL_PARAM_get_int(prm, &i))
87            goto err;
88        ossl_ffc_params_enable_flags(ffc, FFC_PARAM_FLAG_VALIDATE_PQ, i);
89    }
90    prm  = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_VALIDATE_G);
91    if (prm != NULL) {
92        if (!OSSL_PARAM_get_int(prm, &i))
93            goto err;
94        ossl_ffc_params_enable_flags(ffc, FFC_PARAM_FLAG_VALIDATE_G, i);
95    }
96    prm  = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_VALIDATE_LEGACY);
97    if (prm != NULL) {
98        if (!OSSL_PARAM_get_int(prm, &i))
99            goto err;
100        ossl_ffc_params_enable_flags(ffc, FFC_PARAM_FLAG_VALIDATE_LEGACY, i);
101    }
102
103    prm = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_DIGEST);
104    if (prm != NULL) {
105        const OSSL_PARAM *p1;
106        const char *props = NULL;
107
108        if (prm->data_type != OSSL_PARAM_UTF8_STRING)
109            goto err;
110        p1 = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_DIGEST_PROPS);
111        if (p1 != NULL) {
112            if (p1->data_type != OSSL_PARAM_UTF8_STRING)
113                goto err;
114            props = p1->data;
115        }
116        if (!ossl_ffc_set_digest(ffc, prm->data, props))
117            goto err;
118    }
119
120    ossl_ffc_params_set0_pqg(ffc, p, q, g);
121    ossl_ffc_params_set0_j(ffc, j);
122    return 1;
123
124 err:
125    BN_free(j);
126    BN_free(p);
127    BN_free(q);
128    BN_free(g);
129    return 0;
130}
131