2 * Copyright 1995-2020 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 * DSA low level APIs are deprecated for public use, but still ok for
14 #include "internal/deprecated.h"
17 #include "internal/cryptlib.h"
18 #include "internal/refcount.h"
19 #include <openssl/bn.h>
20 #include <openssl/asn1.h>
21 #include <openssl/engine.h>
22 #include "dsa_local.h"
23 #include "crypto/dsa.h"
24 #include "crypto/dh.h" /* required by DSA_dup_DH() */
26 static DSA *dsa_new_intern(ENGINE *engine, OPENSSL_CTX *libctx);
30 int DSA_set_ex_data(DSA *d, int idx, void *arg)
32 return CRYPTO_set_ex_data(&d->ex_data, idx, arg);
35 void *DSA_get_ex_data(const DSA *d, int idx)
37 return CRYPTO_get_ex_data(&d->ex_data, idx);
40 # ifndef OPENSSL_NO_DH
41 DH *DSA_dup_DH(const DSA *r)
44 * DSA has p, q, g, optional pub_key, optional priv_key.
45 * DH has p, optional length, g, optional pub_key,
46 * optional priv_key, optional q.
49 BIGNUM *pub_key = NULL, *priv_key = NULL;
57 if (!ffc_params_copy(dh_get0_params(ret), &r->params))
60 if (r->pub_key != NULL) {
61 pub_key = BN_dup(r->pub_key);
64 if (r->priv_key != NULL) {
65 priv_key = BN_dup(r->priv_key);
69 if (!DH_set0_key(ret, pub_key, priv_key))
71 } else if (r->priv_key != NULL) {
72 /* Shouldn't happen */
84 # endif /* OPENSSL_NO_DH */
86 void DSA_clear_flags(DSA *d, int flags)
91 int DSA_test_flags(const DSA *d, int flags)
93 return d->flags & flags;
96 void DSA_set_flags(DSA *d, int flags)
101 ENGINE *DSA_get0_engine(DSA *d)
106 int DSA_set_method(DSA *dsa, const DSA_METHOD *meth)
109 * NB: The caller is specifically setting a method, so it's not up to us
110 * to deal with which ENGINE it comes from.
112 const DSA_METHOD *mtmp;
116 #ifndef OPENSSL_NO_ENGINE
117 ENGINE_finish(dsa->engine);
125 #endif /* FIPS_MODE */
128 const DSA_METHOD *DSA_get_method(DSA *d)
133 static DSA *dsa_new_intern(ENGINE *engine, OPENSSL_CTX *libctx)
135 DSA *ret = OPENSSL_zalloc(sizeof(*ret));
138 DSAerr(0, ERR_R_MALLOC_FAILURE);
143 ret->lock = CRYPTO_THREAD_lock_new();
144 if (ret->lock == NULL) {
145 DSAerr(0, ERR_R_MALLOC_FAILURE);
150 ret->libctx = libctx;
151 ret->meth = DSA_get_default_method();
152 #if !defined(FIPS_MODE) && !defined(OPENSSL_NO_ENGINE)
153 ret->flags = ret->meth->flags & ~DSA_FLAG_NON_FIPS_ALLOW; /* early default init */
155 if (!ENGINE_init(engine)) {
156 DSAerr(0, ERR_R_ENGINE_LIB);
159 ret->engine = engine;
161 ret->engine = ENGINE_get_default_DSA();
163 ret->meth = ENGINE_get_DSA(ret->engine);
164 if (ret->meth == NULL) {
165 DSAerr(0, ERR_R_ENGINE_LIB);
171 ret->flags = ret->meth->flags & ~DSA_FLAG_NON_FIPS_ALLOW;
174 if (!crypto_new_ex_data_ex(libctx, CRYPTO_EX_INDEX_DSA, ret, &ret->ex_data))
178 if ((ret->meth->init != NULL) && !ret->meth->init(ret)) {
179 DSAerr(0, ERR_R_INIT_FAIL);
190 DSA *DSA_new_method(ENGINE *engine)
192 return dsa_new_intern(engine, NULL);
195 DSA *dsa_new_with_ctx(OPENSSL_CTX *libctx)
197 return dsa_new_intern(NULL, libctx);
203 return dsa_new_intern(NULL, NULL);
207 void DSA_free(DSA *r)
214 CRYPTO_DOWN_REF(&r->references, &i, r->lock);
215 REF_PRINT_COUNT("DSA", r);
218 REF_ASSERT_ISNT(i < 0);
220 if (r->meth != NULL && r->meth->finish != NULL)
222 #if !defined(FIPS_MODE) && !defined(OPENSSL_NO_ENGINE)
223 ENGINE_finish(r->engine);
227 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DSA, r, &r->ex_data);
230 CRYPTO_THREAD_lock_free(r->lock);
232 ffc_params_cleanup(&r->params);
233 BN_clear_free(r->pub_key);
234 BN_clear_free(r->priv_key);
238 int DSA_up_ref(DSA *r)
242 if (CRYPTO_UP_REF(&r->references, &i, r->lock) <= 0)
245 REF_PRINT_COUNT("DSA", r);
246 REF_ASSERT_ISNT(i < 2);
247 return ((i > 1) ? 1 : 0);
250 void DSA_get0_pqg(const DSA *d,
251 const BIGNUM **p, const BIGNUM **q, const BIGNUM **g)
253 ffc_params_get0_pqg(&d->params, p, q, g);
256 int DSA_set0_pqg(DSA *d, BIGNUM *p, BIGNUM *q, BIGNUM *g)
258 /* If the fields p, q and g in d are NULL, the corresponding input
259 * parameters MUST be non-NULL.
261 if ((d->params.p == NULL && p == NULL)
262 || (d->params.q == NULL && q == NULL)
263 || (d->params.g == NULL && g == NULL))
266 ffc_params_set0_pqg(&d->params, p, q, g);
272 const BIGNUM *DSA_get0_p(const DSA *d)
277 const BIGNUM *DSA_get0_q(const DSA *d)
282 const BIGNUM *DSA_get0_g(const DSA *d)
287 const BIGNUM *DSA_get0_pub_key(const DSA *d)
292 const BIGNUM *DSA_get0_priv_key(const DSA *d)
297 void DSA_get0_key(const DSA *d,
298 const BIGNUM **pub_key, const BIGNUM **priv_key)
301 *pub_key = d->pub_key;
302 if (priv_key != NULL)
303 *priv_key = d->priv_key;
306 int DSA_set0_key(DSA *d, BIGNUM *pub_key, BIGNUM *priv_key)
308 /* If the field pub_key in d is NULL, the corresponding input
309 * parameters MUST be non-NULL. The priv_key field may
312 if (d->pub_key == NULL && pub_key == NULL)
315 if (pub_key != NULL) {
317 d->pub_key = pub_key;
319 if (priv_key != NULL) {
320 BN_free(d->priv_key);
321 d->priv_key = priv_key;
328 int DSA_security_bits(const DSA *d)
330 if (d->params.p != NULL && d->params.q != NULL)
331 return BN_security_bits(BN_num_bits(d->params.p),
332 BN_num_bits(d->params.q));
336 int DSA_bits(const DSA *dsa)
338 return BN_num_bits(dsa->params.p);
341 FFC_PARAMS *dsa_get0_params(DSA *dsa)