2 * Copyright 1995-2018 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the OpenSSL license (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 "internal/cryptlib.h"
12 #include "internal/refcount.h"
13 #include <openssl/bn.h>
15 #include <openssl/asn1.h>
16 #include <openssl/engine.h>
17 #include <openssl/dh.h>
21 return DSA_new_method(NULL);
24 int DSA_set_method(DSA *dsa, const DSA_METHOD *meth)
27 * NB: The caller is specifically setting a method, so it's not up to us
28 * to deal with which ENGINE it comes from.
30 const DSA_METHOD *mtmp;
34 #ifndef OPENSSL_NO_ENGINE
35 ENGINE_finish(dsa->engine);
44 const DSA_METHOD *DSA_get_method(DSA *d)
49 DSA *DSA_new_method(ENGINE *engine)
51 DSA *ret = OPENSSL_zalloc(sizeof(*ret));
54 DSAerr(DSA_F_DSA_NEW_METHOD, ERR_R_MALLOC_FAILURE);
59 ret->lock = CRYPTO_THREAD_lock_new();
60 if (ret->lock == NULL) {
61 DSAerr(DSA_F_DSA_NEW_METHOD, ERR_R_MALLOC_FAILURE);
66 ret->meth = DSA_get_default_method();
67 #ifndef OPENSSL_NO_ENGINE
68 ret->flags = ret->meth->flags & ~DSA_FLAG_NON_FIPS_ALLOW; /* early default init */
70 if (!ENGINE_init(engine)) {
71 DSAerr(DSA_F_DSA_NEW_METHOD, ERR_R_ENGINE_LIB);
76 ret->engine = ENGINE_get_default_DSA();
78 ret->meth = ENGINE_get_DSA(ret->engine);
79 if (ret->meth == NULL) {
80 DSAerr(DSA_F_DSA_NEW_METHOD, ERR_R_ENGINE_LIB);
86 ret->flags = ret->meth->flags & ~DSA_FLAG_NON_FIPS_ALLOW;
88 if (!CRYPTO_new_ex_data(CRYPTO_EX_INDEX_DSA, ret, &ret->ex_data))
91 if ((ret->meth->init != NULL) && !ret->meth->init(ret)) {
92 DSAerr(DSA_F_DSA_NEW_METHOD, ERR_R_INIT_FAIL);
103 void DSA_free(DSA *r)
110 CRYPTO_DOWN_REF(&r->references, &i, r->lock);
111 REF_PRINT_COUNT("DSA", r);
114 REF_ASSERT_ISNT(i < 0);
116 if (r->meth != NULL && r->meth->finish != NULL)
118 #ifndef OPENSSL_NO_ENGINE
119 ENGINE_finish(r->engine);
122 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DSA, r, &r->ex_data);
124 CRYPTO_THREAD_lock_free(r->lock);
129 BN_clear_free(r->pub_key);
130 BN_clear_free(r->priv_key);
134 int DSA_up_ref(DSA *r)
138 if (CRYPTO_UP_REF(&r->references, &i, r->lock) <= 0)
141 REF_PRINT_COUNT("DSA", r);
142 REF_ASSERT_ISNT(i < 2);
143 return ((i > 1) ? 1 : 0);
146 int DSA_size(const DSA *r)
150 unsigned char buf[4]; /* 4 bytes looks really small. However,
151 * i2d_ASN1_INTEGER() will not look beyond
152 * the first byte, as long as the second
153 * parameter is NULL. */
155 i = BN_num_bits(r->q);
156 bs.length = (i + 7) / 8;
158 bs.type = V_ASN1_INTEGER;
159 /* If the top bit is set the asn1 encoding is 1 larger. */
162 i = i2d_ASN1_INTEGER(&bs, NULL);
163 i += i; /* r and s */
164 ret = ASN1_object_size(1, i, V_ASN1_SEQUENCE);
168 int DSA_set_ex_data(DSA *d, int idx, void *arg)
170 return CRYPTO_set_ex_data(&d->ex_data, idx, arg);
173 void *DSA_get_ex_data(DSA *d, int idx)
175 return CRYPTO_get_ex_data(&d->ex_data, idx);
178 int DSA_security_bits(const DSA *d)
181 return BN_security_bits(BN_num_bits(d->p), BN_num_bits(d->q));
185 #ifndef OPENSSL_NO_DH
186 DH *DSA_dup_DH(const DSA *r)
189 * DSA has p, q, g, optional pub_key, optional priv_key. DH has p,
190 * optional length, g, optional pub_key, optional priv_key, optional q.
194 BIGNUM *p = NULL, *q = NULL, *g = NULL, *pub_key = NULL, *priv_key = NULL;
201 if (r->p != NULL || r->g != NULL || r->q != NULL) {
202 if (r->p == NULL || r->g == NULL || r->q == NULL) {
203 /* Shouldn't happen */
209 if (p == NULL || g == NULL || q == NULL || !DH_set0_pqg(ret, p, q, g))
214 if (r->pub_key != NULL) {
215 pub_key = BN_dup(r->pub_key);
218 if (r->priv_key != NULL) {
219 priv_key = BN_dup(r->priv_key);
220 if (priv_key == NULL)
223 if (!DH_set0_key(ret, pub_key, priv_key))
225 } else if (r->priv_key != NULL) {
226 /* Shouldn't happen */
243 void DSA_get0_pqg(const DSA *d,
244 const BIGNUM **p, const BIGNUM **q, const BIGNUM **g)
254 int DSA_set0_pqg(DSA *d, BIGNUM *p, BIGNUM *q, BIGNUM *g)
256 /* If the fields p, q and g in d are NULL, the corresponding input
257 * parameters MUST be non-NULL.
259 if ((d->p == NULL && p == NULL)
260 || (d->q == NULL && q == NULL)
261 || (d->g == NULL && g == NULL))
280 void DSA_get0_key(const DSA *d,
281 const BIGNUM **pub_key, const BIGNUM **priv_key)
284 *pub_key = d->pub_key;
285 if (priv_key != NULL)
286 *priv_key = d->priv_key;
289 int DSA_set0_key(DSA *d, BIGNUM *pub_key, BIGNUM *priv_key)
291 /* If the field pub_key in d is NULL, the corresponding input
292 * parameters MUST be non-NULL. The priv_key field may
295 if (d->pub_key == NULL && pub_key == NULL)
298 if (pub_key != NULL) {
300 d->pub_key = pub_key;
302 if (priv_key != NULL) {
303 BN_free(d->priv_key);
304 d->priv_key = priv_key;
310 const BIGNUM *DSA_get0_p(const DSA *d)
315 const BIGNUM *DSA_get0_q(const DSA *d)
320 const BIGNUM *DSA_get0_g(const DSA *d)
325 const BIGNUM *DSA_get0_pub_key(const DSA *d)
330 const BIGNUM *DSA_get0_priv_key(const DSA *d)
335 void DSA_clear_flags(DSA *d, int flags)
340 int DSA_test_flags(const DSA *d, int flags)
342 return d->flags & flags;
345 void DSA_set_flags(DSA *d, int flags)
350 ENGINE *DSA_get0_engine(DSA *d)
355 int DSA_bits(const DSA *dsa)
357 return BN_num_bits(dsa->p);