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diff --git a/src/lib/libcrypto/dsa/dsa_lib.c b/src/lib/libcrypto/dsa/dsa_lib.c
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1/* $OpenBSD: dsa_lib.c,v 1.48 2024/03/27 01:49:31 tb Exp $ */
2/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3 * All rights reserved.
4 *
5 * This package is an SSL implementation written
6 * by Eric Young (eay@cryptsoft.com).
7 * The implementation was written so as to conform with Netscapes SSL.
8 *
9 * This library is free for commercial and non-commercial use as long as
10 * the following conditions are aheared to. The following conditions
11 * apply to all code found in this distribution, be it the RC4, RSA,
12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation
13 * included with this distribution is covered by the same copyright terms
14 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
15 *
16 * Copyright remains Eric Young's, and as such any Copyright notices in
17 * the code are not to be removed.
18 * If this package is used in a product, Eric Young should be given attribution
19 * as the author of the parts of the library used.
20 * This can be in the form of a textual message at program startup or
21 * in documentation (online or textual) provided with the package.
22 *
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
25 * are met:
26 * 1. Redistributions of source code must retain the copyright
27 * notice, this list of conditions and the following disclaimer.
28 * 2. Redistributions in binary form must reproduce the above copyright
29 * notice, this list of conditions and the following disclaimer in the
30 * documentation and/or other materials provided with the distribution.
31 * 3. All advertising materials mentioning features or use of this software
32 * must display the following acknowledgement:
33 * "This product includes cryptographic software written by
34 * Eric Young (eay@cryptsoft.com)"
35 * The word 'cryptographic' can be left out if the rouines from the library
36 * being used are not cryptographic related :-).
37 * 4. If you include any Windows specific code (or a derivative thereof) from
38 * the apps directory (application code) you must include an acknowledgement:
39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40 *
41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
51 * SUCH DAMAGE.
52 *
53 * The licence and distribution terms for any publically available version or
54 * derivative of this code cannot be changed. i.e. this code cannot simply be
55 * copied and put under another distribution licence
56 * [including the GNU Public Licence.]
57 */
58
59/* Original version from Steven Schoch <schoch@sheba.arc.nasa.gov> */
60
61#include <stdio.h>
62
63#include <openssl/opensslconf.h>
64
65#include <openssl/asn1.h>
66#include <openssl/bn.h>
67#include <openssl/dsa.h>
68#include <openssl/err.h>
69
70#ifndef OPENSSL_NO_DH
71#include <openssl/dh.h>
72#endif
73
74#include "dh_local.h"
75#include "dsa_local.h"
76
77static const DSA_METHOD *default_DSA_method = NULL;
78
79void
80DSA_set_default_method(const DSA_METHOD *meth)
81{
82 default_DSA_method = meth;
83}
84LCRYPTO_ALIAS(DSA_set_default_method);
85
86const DSA_METHOD *
87DSA_get_default_method(void)
88{
89 if (!default_DSA_method)
90 default_DSA_method = DSA_OpenSSL();
91 return default_DSA_method;
92}
93LCRYPTO_ALIAS(DSA_get_default_method);
94
95DSA *
96DSA_new(void)
97{
98 return DSA_new_method(NULL);
99}
100LCRYPTO_ALIAS(DSA_new);
101
102int
103DSA_set_method(DSA *dsa, const DSA_METHOD *meth)
104{
105 /*
106 * NB: The caller is specifically setting a method, so it's not up to us
107 * to deal with which ENGINE it comes from.
108 */
109 const DSA_METHOD *mtmp;
110 mtmp = dsa->meth;
111 if (mtmp->finish)
112 mtmp->finish(dsa);
113 dsa->meth = meth;
114 if (meth->init)
115 meth->init(dsa);
116 return 1;
117}
118LCRYPTO_ALIAS(DSA_set_method);
119
120DSA *
121DSA_new_method(ENGINE *engine)
122{
123 DSA *dsa;
124
125 if ((dsa = calloc(1, sizeof(DSA))) == NULL) {
126 DSAerror(ERR_R_MALLOC_FAILURE);
127 goto err;
128 }
129
130 dsa->meth = DSA_get_default_method();
131 dsa->flags = dsa->meth->flags & ~DSA_FLAG_NON_FIPS_ALLOW;
132 dsa->references = 1;
133
134 if (!CRYPTO_new_ex_data(CRYPTO_EX_INDEX_DSA, dsa, &dsa->ex_data))
135 goto err;
136 if (dsa->meth->init != NULL && !dsa->meth->init(dsa))
137 goto err;
138
139 return dsa;
140
141 err:
142 DSA_free(dsa);
143
144 return NULL;
145}
146LCRYPTO_ALIAS(DSA_new_method);
147
148void
149DSA_free(DSA *dsa)
150{
151 if (dsa == NULL)
152 return;
153
154 if (CRYPTO_add(&dsa->references, -1, CRYPTO_LOCK_DSA) > 0)
155 return;
156
157 if (dsa->meth != NULL && dsa->meth->finish != NULL)
158 dsa->meth->finish(dsa);
159
160 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DSA, dsa, &dsa->ex_data);
161
162 BN_free(dsa->p);
163 BN_free(dsa->q);
164 BN_free(dsa->g);
165 BN_free(dsa->pub_key);
166 BN_free(dsa->priv_key);
167 BN_free(dsa->kinv);
168 BN_free(dsa->r);
169 free(dsa);
170}
171LCRYPTO_ALIAS(DSA_free);
172
173int
174DSA_up_ref(DSA *dsa)
175{
176 return CRYPTO_add(&dsa->references, 1, CRYPTO_LOCK_DSA) > 1;
177}
178LCRYPTO_ALIAS(DSA_up_ref);
179
180int
181DSA_size(const DSA *dsa)
182{
183 DSA_SIG signature;
184 int ret = 0;
185
186 signature.r = dsa->q;
187 signature.s = dsa->q;
188
189 if ((ret = i2d_DSA_SIG(&signature, NULL)) < 0)
190 ret = 0;
191
192 return ret;
193}
194LCRYPTO_ALIAS(DSA_size);
195
196int
197DSA_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,
198 CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func)
199{
200 return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_DSA, argl, argp,
201 new_func, dup_func, free_func);
202}
203LCRYPTO_ALIAS(DSA_get_ex_new_index);
204
205int
206DSA_set_ex_data(DSA *dsa, int idx, void *arg)
207{
208 return CRYPTO_set_ex_data(&dsa->ex_data, idx, arg);
209}
210LCRYPTO_ALIAS(DSA_set_ex_data);
211
212void *
213DSA_get_ex_data(DSA *dsa, int idx)
214{
215 return CRYPTO_get_ex_data(&dsa->ex_data, idx);
216}
217LCRYPTO_ALIAS(DSA_get_ex_data);
218
219int
220DSA_security_bits(const DSA *dsa)
221{
222 if (dsa->p == NULL || dsa->q == NULL)
223 return -1;
224
225 return BN_security_bits(BN_num_bits(dsa->p), BN_num_bits(dsa->q));
226}
227LCRYPTO_ALIAS(DSA_security_bits);
228
229#ifndef OPENSSL_NO_DH
230DH *
231DSA_dup_DH(const DSA *dsa)
232{
233 /*
234 * DSA has p, q, g, optional pub_key, optional priv_key.
235 * DH has p, optional length, g, optional pub_key, optional priv_key,
236 * optional q.
237 */
238 DH *dh = NULL;
239
240 if (dsa == NULL)
241 goto err;
242
243 if ((dh = DH_new()) == NULL)
244 goto err;
245
246 if (dsa->p != NULL) {
247 if ((dh->p = BN_dup(dsa->p)) == NULL)
248 goto err;
249 }
250 if (dsa->q != NULL) {
251 dh->length = BN_num_bits(dsa->q);
252 if ((dh->q = BN_dup(dsa->q)) == NULL)
253 goto err;
254 }
255 if (dsa->g != NULL) {
256 if ((dh->g = BN_dup(dsa->g)) == NULL)
257 goto err;
258 }
259 if (dsa->pub_key != NULL) {
260 if ((dh->pub_key = BN_dup(dsa->pub_key)) == NULL)
261 goto err;
262 }
263 if (dsa->priv_key != NULL) {
264 if ((dh->priv_key = BN_dup(dsa->priv_key)) == NULL)
265 goto err;
266 }
267
268 return dh;
269
270 err:
271 DH_free(dh);
272 return NULL;
273}
274LCRYPTO_ALIAS(DSA_dup_DH);
275#endif
276
277void
278DSA_get0_pqg(const DSA *dsa, const BIGNUM **p, const BIGNUM **q, const BIGNUM **g)
279{
280 if (p != NULL)
281 *p = dsa->p;
282 if (q != NULL)
283 *q = dsa->q;
284 if (g != NULL)
285 *g = dsa->g;
286}
287LCRYPTO_ALIAS(DSA_get0_pqg);
288
289int
290DSA_set0_pqg(DSA *dsa, BIGNUM *p, BIGNUM *q, BIGNUM *g)
291{
292 if ((dsa->p == NULL && p == NULL) || (dsa->q == NULL && q == NULL) ||
293 (dsa->g == NULL && g == NULL))
294 return 0;
295
296 if (p != NULL) {
297 BN_free(dsa->p);
298 dsa->p = p;
299 }
300 if (q != NULL) {
301 BN_free(dsa->q);
302 dsa->q = q;
303 }
304 if (g != NULL) {
305 BN_free(dsa->g);
306 dsa->g = g;
307 }
308
309 return 1;
310}
311LCRYPTO_ALIAS(DSA_set0_pqg);
312
313void
314DSA_get0_key(const DSA *dsa, const BIGNUM **pub_key, const BIGNUM **priv_key)
315{
316 if (pub_key != NULL)
317 *pub_key = dsa->pub_key;
318 if (priv_key != NULL)
319 *priv_key = dsa->priv_key;
320}
321LCRYPTO_ALIAS(DSA_get0_key);
322
323int
324DSA_set0_key(DSA *dsa, BIGNUM *pub_key, BIGNUM *priv_key)
325{
326 if (dsa->pub_key == NULL && pub_key == NULL)
327 return 0;
328
329 if (pub_key != NULL) {
330 BN_free(dsa->pub_key);
331 dsa->pub_key = pub_key;
332 }
333 if (priv_key != NULL) {
334 BN_free(dsa->priv_key);
335 dsa->priv_key = priv_key;
336 }
337
338 return 1;
339}
340LCRYPTO_ALIAS(DSA_set0_key);
341
342const BIGNUM *
343DSA_get0_p(const DSA *dsa)
344{
345 return dsa->p;
346}
347LCRYPTO_ALIAS(DSA_get0_p);
348
349const BIGNUM *
350DSA_get0_q(const DSA *dsa)
351{
352 return dsa->q;
353}
354LCRYPTO_ALIAS(DSA_get0_q);
355
356const BIGNUM *
357DSA_get0_g(const DSA *dsa)
358{
359 return dsa->g;
360}
361LCRYPTO_ALIAS(DSA_get0_g);
362
363const BIGNUM *
364DSA_get0_pub_key(const DSA *dsa)
365{
366 return dsa->pub_key;
367}
368LCRYPTO_ALIAS(DSA_get0_pub_key);
369
370const BIGNUM *
371DSA_get0_priv_key(const DSA *dsa)
372{
373 return dsa->priv_key;
374}
375LCRYPTO_ALIAS(DSA_get0_priv_key);
376
377void
378DSA_clear_flags(DSA *dsa, int flags)
379{
380 dsa->flags &= ~flags;
381}
382LCRYPTO_ALIAS(DSA_clear_flags);
383
384int
385DSA_test_flags(const DSA *dsa, int flags)
386{
387 return dsa->flags & flags;
388}
389LCRYPTO_ALIAS(DSA_test_flags);
390
391void
392DSA_set_flags(DSA *dsa, int flags)
393{
394 dsa->flags |= flags;
395}
396LCRYPTO_ALIAS(DSA_set_flags);
397
398ENGINE *
399DSA_get0_engine(DSA *dsa)
400{
401 return NULL;
402}
403LCRYPTO_ALIAS(DSA_get0_engine);
404
405int
406DSA_bits(const DSA *dsa)
407{
408 return BN_num_bits(dsa->p);
409}
410LCRYPTO_ALIAS(DSA_bits);
411
412int
413dsa_check_key(const DSA *dsa)
414{
415 int p_bits, q_bits;
416
417 if (dsa->p == NULL || dsa->q == NULL || dsa->g == NULL) {
418 DSAerror(DSA_R_MISSING_PARAMETERS);
419 return 0;
420 }
421
422 /* Checking that p and q are primes is expensive. Check they are odd. */
423 if (!BN_is_odd(dsa->p) || !BN_is_odd(dsa->q)) {
424 DSAerror(DSA_R_INVALID_PARAMETERS);
425 return 0;
426 }
427
428 /* FIPS 186-4: 1 < g < p. */
429 if (BN_cmp(dsa->g, BN_value_one()) <= 0 ||
430 BN_cmp(dsa->g, dsa->p) >= 0) {
431 DSAerror(DSA_R_INVALID_PARAMETERS);
432 return 0;
433 }
434
435 /* We know p and g are positive. The next two checks imply q > 0. */
436 if (BN_is_negative(dsa->q)) {
437 DSAerror(DSA_R_BAD_Q_VALUE);
438 return 0;
439 }
440
441 /* FIPS 186-4 only allows three sizes for q. */
442 q_bits = BN_num_bits(dsa->q);
443 if (q_bits != 160 && q_bits != 224 && q_bits != 256) {
444 DSAerror(DSA_R_BAD_Q_VALUE);
445 return 0;
446 }
447
448 /*
449 * XXX - FIPS 186-4 only allows 1024, 2048, and 3072 bits for p.
450 * Cap the size to reduce DoS risks. Poor defaults make keys with
451 * incorrect p sizes >= 512 bits common, so only enforce a weak
452 * lower bound.
453 */
454 p_bits = BN_num_bits(dsa->p);
455 if (p_bits > OPENSSL_DSA_MAX_MODULUS_BITS) {
456 DSAerror(DSA_R_MODULUS_TOO_LARGE);
457 return 0;
458 }
459 if (p_bits < 512) {
460 DSAerror(DSA_R_INVALID_PARAMETERS);
461 return 0;
462 }
463
464 /* The public key must be in the multiplicative group (mod p). */
465 if (dsa->pub_key != NULL) {
466 if (BN_cmp(dsa->pub_key, BN_value_one()) <= 0 ||
467 BN_cmp(dsa->pub_key, dsa->p) >= 0) {
468 DSAerror(DSA_R_INVALID_PARAMETERS);
469 return 0;
470 }
471 }
472
473 /* The private key must be nonzero and in GF(q). */
474 if (dsa->priv_key != NULL) {
475 if (BN_cmp(dsa->priv_key, BN_value_one()) < 0 ||
476 BN_cmp(dsa->priv_key, dsa->q) >= 0) {
477 DSAerror(DSA_R_INVALID_PARAMETERS);
478 return 0;
479 }
480 }
481
482 return 1;
483}
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