2 * Copyright 1995-2018 The OpenSSL Project Authors. All Rights Reserved.
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
11 #include <openssl/bn.h>
12 #include <openssl/engine.h>
13 #include <openssl/obj_mac.h>
14 #include "internal/cryptlib.h"
15 #include "internal/refcount.h"
16 #include "crypto/dh.h"
20 int DH_set_method(DH *dh, const DH_METHOD *meth)
23 * NB: The caller is specifically setting a method, so it's not up to us
24 * to deal with which ENGINE it comes from.
26 const DH_METHOD *mtmp;
30 #ifndef OPENSSL_NO_ENGINE
31 ENGINE_finish(dh->engine);
39 #endif /* !FIPS_MODE */
43 return DH_new_method(NULL);
46 DH *DH_new_method(ENGINE *engine)
48 DH *ret = OPENSSL_zalloc(sizeof(*ret));
51 DHerr(DH_F_DH_NEW_METHOD, ERR_R_MALLOC_FAILURE);
56 ret->lock = CRYPTO_THREAD_lock_new();
57 if (ret->lock == NULL) {
58 DHerr(DH_F_DH_NEW_METHOD, ERR_R_MALLOC_FAILURE);
63 ret->meth = DH_get_default_method();
64 #if !defined(FIPS_MODE) && !defined(OPENSSL_NO_ENGINE)
65 ret->flags = ret->meth->flags; /* early default init */
67 if (!ENGINE_init(engine)) {
68 DHerr(DH_F_DH_NEW_METHOD, ERR_R_ENGINE_LIB);
73 ret->engine = ENGINE_get_default_DH();
75 ret->meth = ENGINE_get_DH(ret->engine);
76 if (ret->meth == NULL) {
77 DHerr(DH_F_DH_NEW_METHOD, ERR_R_ENGINE_LIB);
83 ret->flags = ret->meth->flags;
86 if (!CRYPTO_new_ex_data(CRYPTO_EX_INDEX_DH, ret, &ret->ex_data))
88 #endif /* FIPS_MODE */
90 if ((ret->meth->init != NULL) && !ret->meth->init(ret)) {
91 DHerr(DH_F_DH_NEW_METHOD, ERR_R_INIT_FAIL);
109 CRYPTO_DOWN_REF(&r->references, &i, r->lock);
110 REF_PRINT_COUNT("DH", r);
113 REF_ASSERT_ISNT(i < 0);
115 if (r->meth != NULL && r->meth->finish != NULL)
117 #if !defined(FIPS_MODE)
118 # if !defined(OPENSSL_NO_ENGINE)
119 ENGINE_finish(r->engine);
121 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DH, r, &r->ex_data);
124 CRYPTO_THREAD_lock_free(r->lock);
126 ffc_params_cleanup(&r->params);
127 BN_clear_free(r->pub_key);
128 BN_clear_free(r->priv_key);
136 if (CRYPTO_UP_REF(&r->references, &i, r->lock) <= 0)
139 REF_PRINT_COUNT("DH", r);
140 REF_ASSERT_ISNT(i < 2);
141 return ((i > 1) ? 1 : 0);
145 int DH_set_ex_data(DH *d, int idx, void *arg)
147 return CRYPTO_set_ex_data(&d->ex_data, idx, arg);
150 void *DH_get_ex_data(DH *d, int idx)
152 return CRYPTO_get_ex_data(&d->ex_data, idx);
156 int DH_bits(const DH *dh)
158 return BN_num_bits(dh->params.p);
161 int DH_size(const DH *dh)
163 return BN_num_bytes(dh->params.p);
166 int DH_security_bits(const DH *dh)
169 if (dh->params.q != NULL)
170 N = BN_num_bits(dh->params.q);
175 return BN_security_bits(BN_num_bits(dh->params.p), N);
178 void DH_get0_pqg(const DH *dh,
179 const BIGNUM **p, const BIGNUM **q, const BIGNUM **g)
181 ffc_params_get0_pqg(&dh->params, p, q, g);
184 int DH_set0_pqg(DH *dh, BIGNUM *p, BIGNUM *q, BIGNUM *g)
186 /* If the fields p and g in d are NULL, the corresponding input
187 * parameters MUST be non-NULL. q may remain NULL.
189 if ((dh->params.p == NULL && p == NULL)
190 || (dh->params.g == NULL && g == NULL))
193 ffc_params_set0_pqg(&dh->params, p, q, g);
194 dh->params.nid = NID_undef;
195 DH_get_nid(dh); /* Check if this is a named group and cache it */
198 dh->length = BN_num_bits(q);
204 long DH_get_length(const DH *dh)
209 int DH_set_length(DH *dh, long length)
215 void DH_get0_key(const DH *dh, const BIGNUM **pub_key, const BIGNUM **priv_key)
218 *pub_key = dh->pub_key;
219 if (priv_key != NULL)
220 *priv_key = dh->priv_key;
223 int DH_set0_key(DH *dh, BIGNUM *pub_key, BIGNUM *priv_key)
225 if (pub_key != NULL) {
226 BN_clear_free(dh->pub_key);
227 dh->pub_key = pub_key;
229 if (priv_key != NULL) {
230 BN_clear_free(dh->priv_key);
231 dh->priv_key = priv_key;
238 const BIGNUM *DH_get0_p(const DH *dh)
243 const BIGNUM *DH_get0_q(const DH *dh)
248 const BIGNUM *DH_get0_g(const DH *dh)
253 const BIGNUM *DH_get0_priv_key(const DH *dh)
258 const BIGNUM *DH_get0_pub_key(const DH *dh)
263 void DH_clear_flags(DH *dh, int flags)
268 int DH_test_flags(const DH *dh, int flags)
270 return dh->flags & flags;
273 void DH_set_flags(DH *dh, int flags)
279 ENGINE *DH_get0_engine(DH *dh)
283 #endif /*FIPS_MODE */
285 FFC_PARAMS *dh_get0_params(DH *dh)
289 int dh_get0_nid(const DH *dh)
291 return dh->params.nid;