2 * Copyright 1995-2021 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"
16 #include <openssl/bn.h>
17 #include <openssl/engine.h>
18 #include "internal/cryptlib.h"
19 #include "internal/refcount.h"
20 #include "crypto/dsa.h"
21 #include "crypto/dh.h" /* required by DSA_dup_DH() */
22 #include "dsa_local.h"
24 static DSA *dsa_new_intern(ENGINE *engine, OSSL_LIB_CTX *libctx);
28 int DSA_set_ex_data(DSA *d, int idx, void *arg)
30 return CRYPTO_set_ex_data(&d->ex_data, idx, arg);
33 void *DSA_get_ex_data(const DSA *d, int idx)
35 return CRYPTO_get_ex_data(&d->ex_data, idx);
38 # ifndef OPENSSL_NO_DH
39 DH *DSA_dup_DH(const DSA *r)
42 * DSA has p, q, g, optional pub_key, optional priv_key.
43 * DH has p, optional length, g, optional pub_key,
44 * optional priv_key, optional q.
47 BIGNUM *pub_key = NULL, *priv_key = NULL;
55 if (!ossl_ffc_params_copy(ossl_dh_get0_params(ret), &r->params))
58 if (r->pub_key != NULL) {
59 pub_key = BN_dup(r->pub_key);
62 if (r->priv_key != NULL) {
63 priv_key = BN_dup(r->priv_key);
67 if (!DH_set0_key(ret, pub_key, priv_key))
69 } else if (r->priv_key != NULL) {
70 /* Shouldn't happen */
82 # endif /* OPENSSL_NO_DH */
84 void DSA_clear_flags(DSA *d, int flags)
89 int DSA_test_flags(const DSA *d, int flags)
91 return d->flags & flags;
94 void DSA_set_flags(DSA *d, int flags)
99 ENGINE *DSA_get0_engine(DSA *d)
104 int DSA_set_method(DSA *dsa, const DSA_METHOD *meth)
107 * NB: The caller is specifically setting a method, so it's not up to us
108 * to deal with which ENGINE it comes from.
110 const DSA_METHOD *mtmp;
114 #ifndef OPENSSL_NO_ENGINE
115 ENGINE_finish(dsa->engine);
123 #endif /* FIPS_MODULE */
126 const DSA_METHOD *DSA_get_method(DSA *d)
131 static DSA *dsa_new_intern(ENGINE *engine, OSSL_LIB_CTX *libctx)
133 DSA *ret = OPENSSL_zalloc(sizeof(*ret));
136 ERR_raise(ERR_LIB_DSA, ERR_R_MALLOC_FAILURE);
141 ret->lock = CRYPTO_THREAD_lock_new();
142 if (ret->lock == NULL) {
143 ERR_raise(ERR_LIB_DSA, ERR_R_MALLOC_FAILURE);
148 ret->libctx = libctx;
149 ret->meth = DSA_get_default_method();
150 #if !defined(FIPS_MODULE) && !defined(OPENSSL_NO_ENGINE)
151 ret->flags = ret->meth->flags & ~DSA_FLAG_NON_FIPS_ALLOW; /* early default init */
153 if (!ENGINE_init(engine)) {
154 ERR_raise(ERR_LIB_DSA, ERR_R_ENGINE_LIB);
157 ret->engine = engine;
159 ret->engine = ENGINE_get_default_DSA();
161 ret->meth = ENGINE_get_DSA(ret->engine);
162 if (ret->meth == NULL) {
163 ERR_raise(ERR_LIB_DSA, ERR_R_ENGINE_LIB);
169 ret->flags = ret->meth->flags & ~DSA_FLAG_NON_FIPS_ALLOW;
172 if (!ossl_crypto_new_ex_data_ex(libctx, CRYPTO_EX_INDEX_DSA, ret,
177 if ((ret->meth->init != NULL) && !ret->meth->init(ret)) {
178 ERR_raise(ERR_LIB_DSA, ERR_R_INIT_FAIL);
189 DSA *DSA_new_method(ENGINE *engine)
191 return dsa_new_intern(engine, NULL);
194 DSA *ossl_dsa_new(OSSL_LIB_CTX *libctx)
196 return dsa_new_intern(NULL, libctx);
202 return dsa_new_intern(NULL, NULL);
206 void DSA_free(DSA *r)
213 CRYPTO_DOWN_REF(&r->references, &i, r->lock);
214 REF_PRINT_COUNT("DSA", r);
217 REF_ASSERT_ISNT(i < 0);
219 if (r->meth != NULL && r->meth->finish != NULL)
221 #if !defined(FIPS_MODULE) && !defined(OPENSSL_NO_ENGINE)
222 ENGINE_finish(r->engine);
226 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DSA, r, &r->ex_data);
229 CRYPTO_THREAD_lock_free(r->lock);
231 ossl_ffc_params_cleanup(&r->params);
232 BN_clear_free(r->pub_key);
233 BN_clear_free(r->priv_key);
237 int DSA_up_ref(DSA *r)
241 if (CRYPTO_UP_REF(&r->references, &i, r->lock) <= 0)
244 REF_PRINT_COUNT("DSA", r);
245 REF_ASSERT_ISNT(i < 2);
246 return ((i > 1) ? 1 : 0);
249 void ossl_dsa_set0_libctx(DSA *d, OSSL_LIB_CTX *libctx)
254 void DSA_get0_pqg(const DSA *d,
255 const BIGNUM **p, const BIGNUM **q, const BIGNUM **g)
257 ossl_ffc_params_get0_pqg(&d->params, p, q, g);
260 int DSA_set0_pqg(DSA *d, BIGNUM *p, BIGNUM *q, BIGNUM *g)
262 /* If the fields p, q and g in d are NULL, the corresponding input
263 * parameters MUST be non-NULL.
265 if ((d->params.p == NULL && p == NULL)
266 || (d->params.q == NULL && q == NULL)
267 || (d->params.g == NULL && g == NULL))
270 ossl_ffc_params_set0_pqg(&d->params, p, q, g);
276 const BIGNUM *DSA_get0_p(const DSA *d)
281 const BIGNUM *DSA_get0_q(const DSA *d)
286 const BIGNUM *DSA_get0_g(const DSA *d)
291 const BIGNUM *DSA_get0_pub_key(const DSA *d)
296 const BIGNUM *DSA_get0_priv_key(const DSA *d)
301 void DSA_get0_key(const DSA *d,
302 const BIGNUM **pub_key, const BIGNUM **priv_key)
305 *pub_key = d->pub_key;
306 if (priv_key != NULL)
307 *priv_key = d->priv_key;
310 int DSA_set0_key(DSA *d, BIGNUM *pub_key, BIGNUM *priv_key)
312 if (pub_key != NULL) {
314 d->pub_key = pub_key;
316 if (priv_key != NULL) {
317 BN_free(d->priv_key);
318 d->priv_key = priv_key;
325 int DSA_security_bits(const DSA *d)
327 if (d->params.p != NULL && d->params.q != NULL)
328 return BN_security_bits(BN_num_bits(d->params.p),
329 BN_num_bits(d->params.q));
333 int DSA_bits(const DSA *dsa)
335 if (dsa->params.p != NULL)
336 return BN_num_bits(dsa->params.p);
340 FFC_PARAMS *ossl_dsa_get0_params(DSA *dsa)
345 int ossl_dsa_ffc_params_fromdata(DSA *dsa, const OSSL_PARAM params[])
352 ffc = ossl_dsa_get0_params(dsa);
356 ret = ossl_ffc_params_fromdata(ffc, params);