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1 | /* | |
2 | * Copyright 2017-2021 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 | /* DH parameters from RFC7919 and RFC3526 */ | |
11 | ||
12 | /* | |
13 | * DH low level APIs are deprecated for public use, but still ok for | |
14 | * internal use. | |
15 | */ | |
16 | #include "internal/deprecated.h" | |
17 | ||
18 | #include <stdio.h> | |
19 | #include "internal/cryptlib.h" | |
20 | #include "internal/ffc.h" | |
21 | #include "dh_local.h" | |
22 | #include <openssl/bn.h> | |
23 | #include <openssl/objects.h> | |
24 | #include "internal/nelem.h" | |
25 | #include "crypto/dh.h" | |
26 | #include "internal/e_os.h" /* strcasecmp */ | |
27 | ||
28 | static DH *dh_param_init(OSSL_LIB_CTX *libctx, const DH_NAMED_GROUP *group) | |
29 | { | |
30 | DH *dh = ossl_dh_new_ex(libctx); | |
31 | ||
32 | if (dh == NULL) | |
33 | return NULL; | |
34 | ||
35 | ossl_ffc_named_group_set_pqg(&dh->params, group); | |
36 | dh->params.nid = ossl_ffc_named_group_get_uid(group); | |
37 | dh->dirty_cnt++; | |
38 | return dh; | |
39 | } | |
40 | ||
41 | DH *ossl_dh_new_by_nid_ex(OSSL_LIB_CTX *libctx, int nid) | |
42 | { | |
43 | const DH_NAMED_GROUP *group; | |
44 | ||
45 | if ((group = ossl_ffc_uid_to_dh_named_group(nid)) != NULL) | |
46 | return dh_param_init(libctx, group); | |
47 | ||
48 | ERR_raise(ERR_LIB_DH, DH_R_INVALID_PARAMETER_NID); | |
49 | return NULL; | |
50 | } | |
51 | ||
52 | DH *DH_new_by_nid(int nid) | |
53 | { | |
54 | return ossl_dh_new_by_nid_ex(NULL, nid); | |
55 | } | |
56 | ||
57 | void ossl_dh_cache_named_group(DH *dh) | |
58 | { | |
59 | const DH_NAMED_GROUP *group; | |
60 | ||
61 | if (dh == NULL) | |
62 | return; | |
63 | ||
64 | dh->params.nid = NID_undef; /* flush cached value */ | |
65 | ||
66 | /* Exit if p or g is not set */ | |
67 | if (dh->params.p == NULL | |
68 | || dh->params.g == NULL) | |
69 | return; | |
70 | ||
71 | if ((group = ossl_ffc_numbers_to_dh_named_group(dh->params.p, | |
72 | dh->params.q, | |
73 | dh->params.g)) != NULL) { | |
74 | if (dh->params.q == NULL) | |
75 | dh->params.q = (BIGNUM *)ossl_ffc_named_group_get_q(group); | |
76 | /* cache the nid */ | |
77 | dh->params.nid = ossl_ffc_named_group_get_uid(group); | |
78 | dh->dirty_cnt++; | |
79 | } | |
80 | } | |
81 | ||
82 | int ossl_dh_is_named_safe_prime_group(const DH *dh) | |
83 | { | |
84 | int id = DH_get_nid(dh); | |
85 | ||
86 | /* | |
87 | * Exclude RFC5114 groups (id = 1..3) since they do not have | |
88 | * q = (p - 1) / 2 | |
89 | */ | |
90 | return (id > 3); | |
91 | } | |
92 | ||
93 | int DH_get_nid(const DH *dh) | |
94 | { | |
95 | if (dh == NULL) | |
96 | return NID_undef; | |
97 | ||
98 | return dh->params.nid; | |
99 | } |