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ca2bf555 SL |
1 | /* |
2 | * Copyright 2017-2020 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 | ||
ada66e78 P |
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 | ||
ca2bf555 SL |
18 | #include <stdio.h> |
19 | #include "internal/cryptlib.h" | |
7165593c | 20 | #include "internal/ffc.h" |
ca2bf555 SL |
21 | #include "dh_local.h" |
22 | #include <openssl/bn.h> | |
23 | #include <openssl/objects.h> | |
c829c23b | 24 | #include "internal/nelem.h" |
8083fd3a | 25 | #include "crypto/dh.h" |
b03ec3b5 | 26 | #include "e_os.h" /* strcasecmp */ |
55f02cb6 | 27 | |
c829c23b | 28 | static DH *dh_param_init(OSSL_LIB_CTX *libctx, const DH_NAMED_GROUP *group) |
ca2bf555 | 29 | { |
d8652be0 | 30 | DH *dh = dh_new_ex(libctx); |
ca2bf555 SL |
31 | |
32 | if (dh == NULL) | |
33 | return NULL; | |
34 | ||
c829c23b RL |
35 | ossl_ffc_named_group_set_pqg(&dh->params, group); |
36 | dh->params.nid = ossl_ffc_named_group_get_uid(group); | |
37 | dh->length = BN_num_bits(dh->params.q); | |
ca2bf555 SL |
38 | dh->dirty_cnt++; |
39 | return dh; | |
40 | } | |
41 | ||
c829c23b | 42 | DH *dh_new_by_nid_ex(OSSL_LIB_CTX *libctx, int nid) |
ca2bf555 | 43 | { |
c829c23b | 44 | const DH_NAMED_GROUP *group; |
55f02cb6 | 45 | |
c829c23b RL |
46 | if ((group = ossl_ffc_uid_to_dh_named_group(nid)) != NULL) |
47 | return dh_param_init(libctx, group); | |
7165593c | 48 | |
9311d0c4 | 49 | ERR_raise(ERR_LIB_DH, DH_R_INVALID_PARAMETER_NID); |
55f02cb6 | 50 | return NULL; |
ca2bf555 SL |
51 | } |
52 | ||
8083fd3a SL |
53 | DH *DH_new_by_nid(int nid) |
54 | { | |
d8652be0 | 55 | return dh_new_by_nid_ex(NULL, nid); |
7165593c SL |
56 | } |
57 | ||
738ee181 | 58 | void dh_cache_named_group(DH *dh) |
ca2bf555 | 59 | { |
c829c23b | 60 | const DH_NAMED_GROUP *group; |
55f02cb6 SL |
61 | |
62 | if (dh == NULL) | |
738ee181 SL |
63 | return; |
64 | ||
65 | dh->params.nid = NID_undef; /* flush cached value */ | |
ca2bf555 | 66 | |
738ee181 SL |
67 | /* Exit if p or g is not set */ |
68 | if (dh->params.p == NULL | |
69 | || dh->params.g == NULL) | |
70 | return; | |
ca2bf555 | 71 | |
c829c23b RL |
72 | if ((group = ossl_ffc_numbers_to_dh_named_group(dh->params.p, |
73 | dh->params.q, | |
74 | dh->params.g)) != NULL) { | |
75 | if (dh->params.q == NULL) | |
76 | dh->params.q = (BIGNUM *)ossl_ffc_named_group_get_q(group); | |
77 | /* cache the nid */ | |
78 | dh->params.nid = ossl_ffc_named_group_get_uid(group); | |
79 | dh->length = BN_num_bits(dh->params.q); | |
80 | dh->dirty_cnt++; | |
ca2bf555 | 81 | } |
738ee181 SL |
82 | } |
83 | ||
4718326a SL |
84 | int ossl_dh_is_named_safe_prime_group(const DH *dh) |
85 | { | |
86 | int id = DH_get_nid(dh); | |
87 | ||
88 | /* | |
89 | * Exclude RFC5114 groups (id = 1..3) since they do not have | |
90 | * q = (p - 1) / 2 | |
91 | */ | |
92 | return (id > 3); | |
93 | } | |
94 | ||
738ee181 SL |
95 | int DH_get_nid(const DH *dh) |
96 | { | |
97 | if (dh == NULL) | |
98 | return NID_undef; | |
99 | ||
100 | return dh->params.nid; | |
ca2bf555 | 101 | } |