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7806a782 DSH |
1 | /* |
2 | * Copyright 2017 The OpenSSL Project Authors. All Rights Reserved. | |
3 | * | |
e38873f5 | 4 | * Licensed under the Apache License 2.0 (the "License"). You may not use |
7806a782 DSH |
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 <stdio.h> | |
11 | #include "internal/cryptlib.h" | |
12 | #include "dh_locl.h" | |
13 | #include <openssl/bn.h> | |
14 | #include <openssl/objects.h> | |
25f2138b | 15 | #include "crypto/bn_dh.h" |
7806a782 DSH |
16 | |
17 | static DH *dh_param_init(const BIGNUM *p, int32_t nbits) | |
18 | { | |
19 | DH *dh = DH_new(); | |
20 | if (dh == NULL) | |
21 | return NULL; | |
22 | dh->p = (BIGNUM *)p; | |
23 | dh->g = (BIGNUM *)&_bignum_const_2; | |
24 | dh->length = nbits; | |
8b84b075 | 25 | dh->dirty_cnt++; |
7806a782 DSH |
26 | return dh; |
27 | } | |
28 | ||
29 | DH *DH_new_by_nid(int nid) | |
30 | { | |
31 | switch (nid) { | |
32 | case NID_ffdhe2048: | |
33 | return dh_param_init(&_bignum_ffdhe2048_p, 225); | |
34 | case NID_ffdhe3072: | |
35 | return dh_param_init(&_bignum_ffdhe3072_p, 275); | |
36 | case NID_ffdhe4096: | |
37 | return dh_param_init(&_bignum_ffdhe4096_p, 325); | |
38 | case NID_ffdhe6144: | |
39 | return dh_param_init(&_bignum_ffdhe6144_p, 375); | |
40 | case NID_ffdhe8192: | |
41 | return dh_param_init(&_bignum_ffdhe8192_p, 400); | |
42 | default: | |
43 | DHerr(DH_F_DH_NEW_BY_NID, DH_R_INVALID_PARAMETER_NID); | |
44 | return NULL; | |
45 | } | |
46 | } | |
47 | ||
48 | int DH_get_nid(const DH *dh) | |
49 | { | |
50 | int nid; | |
51 | ||
52 | if (BN_get_word(dh->g) != 2) | |
53 | return NID_undef; | |
54 | if (!BN_cmp(dh->p, &_bignum_ffdhe2048_p)) | |
55 | nid = NID_ffdhe2048; | |
56 | else if (!BN_cmp(dh->p, &_bignum_ffdhe3072_p)) | |
57 | nid = NID_ffdhe3072; | |
58 | else if (!BN_cmp(dh->p, &_bignum_ffdhe4096_p)) | |
59 | nid = NID_ffdhe4096; | |
60 | else if (!BN_cmp(dh->p, &_bignum_ffdhe6144_p)) | |
61 | nid = NID_ffdhe6144; | |
62 | else if (!BN_cmp(dh->p, &_bignum_ffdhe8192_p)) | |
63 | nid = NID_ffdhe8192; | |
64 | else | |
65 | return NID_undef; | |
66 | if (dh->q != NULL) { | |
67 | BIGNUM *q = BN_dup(dh->p); | |
68 | ||
69 | /* Check q = p * 2 + 1 we already know q is odd, so just shift right */ | |
8abeefec BK |
70 | if (q == NULL || !BN_rshift1(q, q) || !BN_cmp(dh->q, q)) |
71 | nid = NID_undef; | |
72 | BN_free(q); | |
7806a782 DSH |
73 | } |
74 | return nid; | |
75 | } |