| /* |
| * Copyright 2017-2022 The OpenSSL Project Authors. All Rights Reserved. |
| * |
| * Licensed under the Apache License 2.0 (the "License"). You may not use |
| * this file except in compliance with the License. You can obtain a copy |
| * in the file LICENSE in the source distribution or at |
| * https://www.openssl.org/source/license.html |
| */ |
| |
| /* DH parameters from RFC7919 and RFC3526 */ |
| |
| /* |
| * DH low level APIs are deprecated for public use, but still ok for |
| * internal use. |
| */ |
| #include "internal/deprecated.h" |
| |
| #include <stdio.h> |
| #include "internal/cryptlib.h" |
| #include "internal/ffc.h" |
| #include "dh_local.h" |
| #include <openssl/bn.h> |
| #include <openssl/objects.h> |
| #include "internal/nelem.h" |
| #include "crypto/dh.h" |
| |
| static DH *dh_param_init(OSSL_LIB_CTX *libctx, const DH_NAMED_GROUP *group) |
| { |
| DH *dh = ossl_dh_new_ex(libctx); |
| |
| if (dh == NULL) |
| return NULL; |
| |
| ossl_ffc_named_group_set_pqg(&dh->params, group); |
| dh->params.nid = ossl_ffc_named_group_get_uid(group); |
| dh->dirty_cnt++; |
| return dh; |
| } |
| |
| DH *ossl_dh_new_by_nid_ex(OSSL_LIB_CTX *libctx, int nid) |
| { |
| const DH_NAMED_GROUP *group; |
| |
| if ((group = ossl_ffc_uid_to_dh_named_group(nid)) != NULL) |
| return dh_param_init(libctx, group); |
| |
| ERR_raise(ERR_LIB_DH, DH_R_INVALID_PARAMETER_NID); |
| return NULL; |
| } |
| |
| DH *DH_new_by_nid(int nid) |
| { |
| return ossl_dh_new_by_nid_ex(NULL, nid); |
| } |
| |
| void ossl_dh_cache_named_group(DH *dh) |
| { |
| const DH_NAMED_GROUP *group; |
| |
| if (dh == NULL) |
| return; |
| |
| dh->params.nid = NID_undef; /* flush cached value */ |
| |
| /* Exit if p or g is not set */ |
| if (dh->params.p == NULL |
| || dh->params.g == NULL) |
| return; |
| |
| if ((group = ossl_ffc_numbers_to_dh_named_group(dh->params.p, |
| dh->params.q, |
| dh->params.g)) != NULL) { |
| if (dh->params.q == NULL) |
| dh->params.q = (BIGNUM *)ossl_ffc_named_group_get_q(group); |
| /* cache the nid */ |
| dh->params.nid = ossl_ffc_named_group_get_uid(group); |
| dh->dirty_cnt++; |
| } |
| } |
| |
| int ossl_dh_is_named_safe_prime_group(const DH *dh) |
| { |
| int id = DH_get_nid(dh); |
| |
| /* |
| * Exclude RFC5114 groups (id = 1..3) since they do not have |
| * q = (p - 1) / 2 |
| */ |
| return (id > 3); |
| } |
| |
| int DH_get_nid(const DH *dh) |
| { |
| if (dh == NULL) |
| return NID_undef; |
| |
| return dh->params.nid; |
| } |