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dsa_lib.c

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1/* $OpenBSD: dsa_lib.c,v 1.29 2018/04/14 07:09:21 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#ifndef OPENSSL_NO_ENGINE-
74#include <openssl/engine.h>-
75#endif-
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}
never executed: end of block
0
84-
85const DSA_METHOD *-
86DSA_get_default_method(void)-
87{-
88 if (!default_DSA_method)
!default_DSA_methodDescription
TRUEevaluated 4 times by 2 tests
Evaluated by:
  • dsatest
  • libcrypto.so.44.0.1
FALSEevaluated 2 times by 1 test
Evaluated by:
  • libcrypto.so.44.0.1
2-4
89 default_DSA_method = DSA_OpenSSL();
executed 4 times by 2 tests: default_DSA_method = DSA_OpenSSL();
Executed by:
  • dsatest
  • libcrypto.so.44.0.1
4
90 return default_DSA_method;
executed 6 times by 2 tests: return default_DSA_method;
Executed by:
  • dsatest
  • libcrypto.so.44.0.1
6
91}-
92-
93DSA *-
94DSA_new(void)-
95{-
96 return DSA_new_method(NULL);
executed 6 times by 2 tests: return DSA_new_method( ((void *)0) );
Executed by:
  • dsatest
  • libcrypto.so.44.0.1
6
97}-
98-
99int-
100DSA_set_method(DSA *dsa, const DSA_METHOD *meth)-
101{-
102 /*-
103 * NB: The caller is specifically setting a method, so it's not up to us-
104 * to deal with which ENGINE it comes from.-
105 */-
106 const DSA_METHOD *mtmp;-
107 mtmp = dsa->meth;-
108 if (mtmp->finish)
mtmp->finishDescription
TRUEnever evaluated
FALSEnever evaluated
0
109 mtmp->finish(dsa);
never executed: mtmp->finish(dsa);
0
110#ifndef OPENSSL_NO_ENGINE-
111 ENGINE_finish(dsa->engine);-
112 dsa->engine = NULL;-
113#endif-
114 dsa->meth = meth;-
115 if (meth->init)
meth->initDescription
TRUEnever evaluated
FALSEnever evaluated
0
116 meth->init(dsa);
never executed: meth->init(dsa);
0
117 return 1;
never executed: return 1;
0
118}-
119-
120DSA *-
121DSA_new_method(ENGINE *engine)-
122{-
123 DSA *ret;-
124-
125 ret = malloc(sizeof(DSA));-
126 if (ret == NULL) {
ret == ((void *)0)Description
TRUEnever evaluated
FALSEevaluated 6 times by 2 tests
Evaluated by:
  • dsatest
  • libcrypto.so.44.0.1
0-6
127 DSAerror(ERR_R_MALLOC_FAILURE);-
128 return NULL;
never executed: return ((void *)0) ;
0
129 }-
130 ret->meth = DSA_get_default_method();-
131#ifndef OPENSSL_NO_ENGINE-
132 if (engine) {
engineDescription
TRUEnever evaluated
FALSEevaluated 6 times by 2 tests
Evaluated by:
  • dsatest
  • libcrypto.so.44.0.1
0-6
133 if (!ENGINE_init(engine)) {
!ENGINE_init(engine)Description
TRUEnever evaluated
FALSEnever evaluated
0
134 DSAerror(ERR_R_ENGINE_LIB);-
135 free(ret);-
136 return NULL;
never executed: return ((void *)0) ;
0
137 }-
138 ret->engine = engine;-
139 } else
never executed: end of block
0
140 ret->engine = ENGINE_get_default_DSA();
executed 6 times by 2 tests: ret->engine = ENGINE_get_default_DSA();
Executed by:
  • dsatest
  • libcrypto.so.44.0.1
6
141 if (ret->engine) {
ret->engineDescription
TRUEnever evaluated
FALSEevaluated 6 times by 2 tests
Evaluated by:
  • dsatest
  • libcrypto.so.44.0.1
0-6
142 ret->meth = ENGINE_get_DSA(ret->engine);-
143 if (ret->meth == NULL) {
ret->meth == ((void *)0)Description
TRUEnever evaluated
FALSEnever evaluated
0
144 DSAerror(ERR_R_ENGINE_LIB);-
145 ENGINE_finish(ret->engine);-
146 free(ret);-
147 return NULL;
never executed: return ((void *)0) ;
0
148 }-
149 }
never executed: end of block
0
150#endif-
151-
152 ret->pad = 0;-
153 ret->version = 0;-
154 ret->write_params = 1;-
155 ret->p = NULL;-
156 ret->q = NULL;-
157 ret->g = NULL;-
158-
159 ret->pub_key = NULL;-
160 ret->priv_key = NULL;-
161-
162 ret->kinv = NULL;-
163 ret->r = NULL;-
164 ret->method_mont_p = NULL;-
165-
166 ret->references = 1;-
167 ret->flags = ret->meth->flags & ~DSA_FLAG_NON_FIPS_ALLOW;-
168 CRYPTO_new_ex_data(CRYPTO_EX_INDEX_DSA, ret, &ret->ex_data);-
169 if (ret->meth->init != NULL && !ret->meth->init(ret)) {
ret->meth->init != ((void *)0)Description
TRUEevaluated 6 times by 2 tests
Evaluated by:
  • dsatest
  • libcrypto.so.44.0.1
FALSEnever evaluated
!ret->meth->init(ret)Description
TRUEnever evaluated
FALSEevaluated 6 times by 2 tests
Evaluated by:
  • dsatest
  • libcrypto.so.44.0.1
0-6
170#ifndef OPENSSL_NO_ENGINE-
171 ENGINE_finish(ret->engine);-
172#endif-
173 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DSA, ret, &ret->ex_data);-
174 free(ret);-
175 ret = NULL;-
176 }
never executed: end of block
0
177 -
178 return ret;
executed 6 times by 2 tests: return ret;
Executed by:
  • dsatest
  • libcrypto.so.44.0.1
6
179}-
180-
181void-
182DSA_free(DSA *r)-
183{-
184 int i;-
185-
186 if (r == NULL)
r == ((void *)0)Description
TRUEevaluated 1 time by 1 test
Evaluated by:
  • freenull
FALSEevaluated 7 times by 2 tests
Evaluated by:
  • dsatest
  • libcrypto.so.44.0.1
1-7
187 return;
executed 1 time by 1 test: return;
Executed by:
  • freenull
1
188-
189 i = CRYPTO_add(&r->references, -1, CRYPTO_LOCK_DSA);-
190 if (i > 0)
i > 0Description
TRUEevaluated 1 time by 1 test
Evaluated by:
  • dsatest
FALSEevaluated 6 times by 2 tests
Evaluated by:
  • dsatest
  • libcrypto.so.44.0.1
1-6
191 return;
executed 1 time by 1 test: return;
Executed by:
  • dsatest
1
192-
193 if (r->meth->finish)
r->meth->finishDescription
TRUEevaluated 6 times by 2 tests
Evaluated by:
  • dsatest
  • libcrypto.so.44.0.1
FALSEnever evaluated
0-6
194 r->meth->finish(r);
executed 6 times by 2 tests: r->meth->finish(r);
Executed by:
  • dsatest
  • libcrypto.so.44.0.1
6
195#ifndef OPENSSL_NO_ENGINE-
196 ENGINE_finish(r->engine);-
197#endif-
198-
199 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DSA, r, &r->ex_data);-
200-
201 BN_clear_free(r->p);-
202 BN_clear_free(r->q);-
203 BN_clear_free(r->g);-
204 BN_clear_free(r->pub_key);-
205 BN_clear_free(r->priv_key);-
206 BN_clear_free(r->kinv);-
207 BN_clear_free(r->r);-
208 free(r);-
209}
executed 6 times by 2 tests: end of block
Executed by:
  • dsatest
  • libcrypto.so.44.0.1
6
210-
211int-
212DSA_up_ref(DSA *r)-
213{-
214 int i = CRYPTO_add(&r->references, 1, CRYPTO_LOCK_DSA);-
215 return i > 1 ? 1 : 0;
executed 1 time by 1 test: return i > 1 ? 1 : 0;
Executed by:
  • dsatest
i > 1Description
TRUEevaluated 1 time by 1 test
Evaluated by:
  • dsatest
FALSEnever evaluated
0-1
216}-
217-
218int-
219DSA_size(const DSA *r)-
220{-
221 int ret, i;-
222 ASN1_INTEGER bs;-
223 unsigned char buf[4]; /* 4 bytes looks really small.-
224 However, i2d_ASN1_INTEGER() will not look-
225 beyond the first byte, as long as the second-
226 parameter is NULL. */-
227-
228 i = BN_num_bits(r->q);-
229 bs.length = (i + 7) / 8;-
230 bs.data = buf;-
231 bs.type = V_ASN1_INTEGER;-
232 /* If the top bit is set the asn1 encoding is 1 larger. */-
233 buf[0] = 0xff;-
234-
235 i = i2d_ASN1_INTEGER(&bs, NULL);-
236 i += i; /* r and s */-
237 ret = ASN1_object_size(1, i, V_ASN1_SEQUENCE);-
238 return ret;
executed 2 times by 1 test: return ret;
Executed by:
  • libcrypto.so.44.0.1
2
239}-
240-
241int-
242DSA_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,-
243 CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func)-
244{-
245 return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_DSA, argl, argp,
never executed: return CRYPTO_get_ex_new_index(7, argl, argp, new_func, dup_func, free_func);
0
246 new_func, dup_func, free_func);
never executed: return CRYPTO_get_ex_new_index(7, argl, argp, new_func, dup_func, free_func);
0
247}-
248-
249int-
250DSA_set_ex_data(DSA *d, int idx, void *arg)-
251{-
252 return CRYPTO_set_ex_data(&d->ex_data, idx, arg);
never executed: return CRYPTO_set_ex_data(&d->ex_data, idx, arg);
0
253}-
254-
255void *-
256DSA_get_ex_data(DSA *d, int idx)-
257{-
258 return CRYPTO_get_ex_data(&d->ex_data, idx);
never executed: return CRYPTO_get_ex_data(&d->ex_data, idx);
0
259}-
260-
261#ifndef OPENSSL_NO_DH-
262DH *-
263DSA_dup_DH(const DSA *r)-
264{-
265 /*-
266 * DSA has p, q, g, optional pub_key, optional priv_key.-
267 * DH has p, optional length, g, optional pub_key, optional priv_key,-
268 * optional q.-
269 */ -
270 DH *ret = NULL;-
271-
272 if (r == NULL)
r == ((void *)0)Description
TRUEnever evaluated
FALSEnever evaluated
0
273 goto err;
never executed: goto err;
0
274 ret = DH_new();-
275 if (ret == NULL)
ret == ((void *)0)Description
TRUEnever evaluated
FALSEnever evaluated
0
276 goto err;
never executed: goto err;
0
277 if (r->p != NULL)
r->p != ((void *)0)Description
TRUEnever evaluated
FALSEnever evaluated
0
278 if ((ret->p = BN_dup(r->p)) == NULL)
(ret->p = BN_d...== ((void *)0)Description
TRUEnever evaluated
FALSEnever evaluated
0
279 goto err;
never executed: goto err;
0
280 if (r->q != NULL) {
r->q != ((void *)0)Description
TRUEnever evaluated
FALSEnever evaluated
0
281 ret->length = BN_num_bits(r->q);-
282 if ((ret->q = BN_dup(r->q)) == NULL)
(ret->q = BN_d...== ((void *)0)Description
TRUEnever evaluated
FALSEnever evaluated
0
283 goto err;
never executed: goto err;
0
284 }
never executed: end of block
0
285 if (r->g != NULL)
r->g != ((void *)0)Description
TRUEnever evaluated
FALSEnever evaluated
0
286 if ((ret->g = BN_dup(r->g)) == NULL)
(ret->g = BN_d...== ((void *)0)Description
TRUEnever evaluated
FALSEnever evaluated
0
287 goto err;
never executed: goto err;
0
288 if (r->pub_key != NULL)
r->pub_key != ((void *)0)Description
TRUEnever evaluated
FALSEnever evaluated
0
289 if ((ret->pub_key = BN_dup(r->pub_key)) == NULL)
(ret->pub_key ...== ((void *)0)Description
TRUEnever evaluated
FALSEnever evaluated
0
290 goto err;
never executed: goto err;
0
291 if (r->priv_key != NULL)
r->priv_key != ((void *)0)Description
TRUEnever evaluated
FALSEnever evaluated
0
292 if ((ret->priv_key = BN_dup(r->priv_key)) == NULL)
(ret->priv_key...== ((void *)0)Description
TRUEnever evaluated
FALSEnever evaluated
0
293 goto err;
never executed: goto err;
0
294-
295 return ret;
never executed: return ret;
0
296-
297err:-
298 DH_free(ret);-
299 return NULL;
never executed: return ((void *)0) ;
0
300}-
301#endif-
302-
303void-
304DSA_get0_pqg(const DSA *d, const BIGNUM **p, const BIGNUM **q, const BIGNUM **g)-
305{-
306 if (p != NULL)
p != ((void *)0)Description
TRUEnever evaluated
FALSEnever evaluated
0
307 *p = d->p;
never executed: *p = d->p;
0
308 if (q != NULL)
q != ((void *)0)Description
TRUEnever evaluated
FALSEnever evaluated
0
309 *q = d->q;
never executed: *q = d->q;
0
310 if (g != NULL)
g != ((void *)0)Description
TRUEnever evaluated
FALSEnever evaluated
0
311 *g = d->g;
never executed: *g = d->g;
0
312}
never executed: end of block
0
313-
314int-
315DSA_set0_pqg(DSA *d, BIGNUM *p, BIGNUM *q, BIGNUM *g)-
316{-
317 if ((d->p == NULL && p == NULL) || (d->q == NULL && q == NULL) ||
d->p == ((void *)0)Description
TRUEnever evaluated
FALSEnever evaluated
p == ((void *)0)Description
TRUEnever evaluated
FALSEnever evaluated
d->q == ((void *)0)Description
TRUEnever evaluated
FALSEnever evaluated
q == ((void *)0)Description
TRUEnever evaluated
FALSEnever evaluated
0
318 (d->g == NULL && g == NULL))
d->g == ((void *)0)Description
TRUEnever evaluated
FALSEnever evaluated
g == ((void *)0)Description
TRUEnever evaluated
FALSEnever evaluated
0
319 return 0;
never executed: return 0;
0
320-
321 if (p != NULL) {
p != ((void *)0)Description
TRUEnever evaluated
FALSEnever evaluated
0
322 BN_free(d->p);-
323 d->p = p;-
324 }
never executed: end of block
0
325 if (q != NULL) {
q != ((void *)0)Description
TRUEnever evaluated
FALSEnever evaluated
0
326 BN_free(d->q);-
327 d->q = q;-
328 }
never executed: end of block
0
329 if (g != NULL) {
g != ((void *)0)Description
TRUEnever evaluated
FALSEnever evaluated
0
330 BN_free(d->g);-
331 d->g = g;-
332 }
never executed: end of block
0
333-
334 return 1;
never executed: return 1;
0
335}-
336-
337void-
338DSA_get0_key(const DSA *d, const BIGNUM **pub_key, const BIGNUM **priv_key)-
339{-
340 if (pub_key != NULL)
pub_key != ((void *)0)Description
TRUEnever evaluated
FALSEnever evaluated
0
341 *pub_key = d->pub_key;
never executed: *pub_key = d->pub_key;
0
342 if (priv_key != NULL)
priv_key != ((void *)0)Description
TRUEnever evaluated
FALSEnever evaluated
0
343 *priv_key = d->priv_key;
never executed: *priv_key = d->priv_key;
0
344}
never executed: end of block
0
345-
346int-
347DSA_set0_key(DSA *d, BIGNUM *pub_key, BIGNUM *priv_key)-
348{-
349 if (d->pub_key == NULL && pub_key == NULL)
d->pub_key == ((void *)0)Description
TRUEnever evaluated
FALSEnever evaluated
pub_key == ((void *)0)Description
TRUEnever evaluated
FALSEnever evaluated
0
350 return 0;
never executed: return 0;
0
351-
352 if (pub_key != NULL) {
pub_key != ((void *)0)Description
TRUEnever evaluated
FALSEnever evaluated
0
353 BN_free(d->pub_key);-
354 d->pub_key = pub_key;-
355 }
never executed: end of block
0
356 if (priv_key != NULL) {
priv_key != ((void *)0)Description
TRUEnever evaluated
FALSEnever evaluated
0
357 BN_free(d->priv_key);-
358 d->priv_key = priv_key;-
359 }
never executed: end of block
0
360-
361 return 1;
never executed: return 1;
0
362}-
363-
364void-
365DSA_clear_flags(DSA *d, int flags)-
366{-
367 d->flags &= ~flags;-
368}
never executed: end of block
0
369-
370int-
371DSA_test_flags(const DSA *d, int flags)-
372{-
373 return d->flags & flags;
never executed: return d->flags & flags;
0
374}-
375-
376void-
377DSA_set_flags(DSA *d, int flags)-
378{-
379 d->flags |= flags;-
380}
never executed: end of block
0
381-
382ENGINE *-
383DSA_get0_engine(DSA *d)-
384{-
385 return d->engine;
never executed: return d->engine;
0
386}-
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