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
ossl_ffc_params_fromdata(FFC_PARAMS * ffc,const OSSL_PARAM params[])20 int 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 prm = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_GROUP_NAME);
28 if (prm != NULL) {
29 /*
30 * In a no-dh build we just go straight to err because we have no
31 * support for this.
32 */
33 #ifndef OPENSSL_NO_DH
34 const DH_NAMED_GROUP *group = NULL;
35
36 if (prm->data_type != OSSL_PARAM_UTF8_STRING
37 || prm->data == NULL
38 || (group = ossl_ffc_name_to_dh_named_group(prm->data)) == NULL
39 || !ossl_ffc_named_group_set(ffc, group))
40 #endif
41 goto err;
42 }
43
44 param_p = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_P);
45 param_g = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_G);
46 param_q = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_Q);
47
48 if ((param_p != NULL && !OSSL_PARAM_get_BN(param_p, &p))
49 || (param_q != NULL && !OSSL_PARAM_get_BN(param_q, &q))
50 || (param_g != NULL && !OSSL_PARAM_get_BN(param_g, &g)))
51 goto err;
52
53 prm = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_GINDEX);
54 if (prm != NULL) {
55 if (!OSSL_PARAM_get_int(prm, &i))
56 goto err;
57 ffc->gindex = i;
58 }
59 prm = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_PCOUNTER);
60 if (prm != NULL) {
61 if (!OSSL_PARAM_get_int(prm, &i))
62 goto err;
63 ffc->pcounter = i;
64 }
65 prm = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_COFACTOR);
66 if (prm != NULL && !OSSL_PARAM_get_BN(prm, &j))
67 goto err;
68 prm = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_H);
69 if (prm != NULL) {
70 if (!OSSL_PARAM_get_int(prm, &i))
71 goto err;
72 ffc->h = i;
73 }
74 prm = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_SEED);
75 if (prm != NULL) {
76 if (prm->data_type != OSSL_PARAM_OCTET_STRING
77 || !ossl_ffc_params_set_seed(ffc, prm->data, prm->data_size))
78 goto err;
79 }
80 prm = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_VALIDATE_PQ);
81 if (prm != NULL) {
82 if (!OSSL_PARAM_get_int(prm, &i))
83 goto err;
84 ossl_ffc_params_enable_flags(ffc, FFC_PARAM_FLAG_VALIDATE_PQ, i);
85 }
86 prm = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_VALIDATE_G);
87 if (prm != NULL) {
88 if (!OSSL_PARAM_get_int(prm, &i))
89 goto err;
90 ossl_ffc_params_enable_flags(ffc, FFC_PARAM_FLAG_VALIDATE_G, i);
91 }
92 prm = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_VALIDATE_LEGACY);
93 if (prm != NULL) {
94 if (!OSSL_PARAM_get_int(prm, &i))
95 goto err;
96 ossl_ffc_params_enable_flags(ffc, FFC_PARAM_FLAG_VALIDATE_LEGACY, i);
97 }
98
99 prm = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_DIGEST);
100 if (prm != NULL) {
101 const OSSL_PARAM *p1;
102 const char *props = NULL;
103
104 if (prm->data_type != OSSL_PARAM_UTF8_STRING)
105 goto err;
106 p1 = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_DIGEST_PROPS);
107 if (p1 != NULL) {
108 if (p1->data_type != OSSL_PARAM_UTF8_STRING)
109 goto err;
110 props = p1->data;
111 }
112 ossl_ffc_set_digest(ffc, prm->data, props);
113 }
114 ossl_ffc_params_set0_pqg(ffc, p, q, g);
115 ossl_ffc_params_set0_j(ffc, j);
116 return 1;
117
118 err:
119 BN_free(j);
120 BN_free(p);
121 BN_free(q);
122 BN_free(g);
123 return 0;
124 }
125
