1/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
2 * project 2000. */
3/* ====================================================================
4 * Copyright (c) 2000-2005 The OpenSSL Project.  All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 *
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 *
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in
15 *    the documentation and/or other materials provided with the
16 *    distribution.
17 *
18 * 3. All advertising materials mentioning features or use of this
19 *    software must display the following acknowledgment:
20 *    "This product includes software developed by the OpenSSL Project
21 *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
22 *
23 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
24 *    endorse or promote products derived from this software without
25 *    prior written permission. For written permission, please contact
26 *    licensing@OpenSSL.org.
27 *
28 * 5. Products derived from this software may not be called "OpenSSL"
29 *    nor may "OpenSSL" appear in their names without prior written
30 *    permission of the OpenSSL Project.
31 *
32 * 6. Redistributions of any form whatsoever must retain the following
33 *    acknowledgment:
34 *    "This product includes software developed by the OpenSSL Project
35 *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
36 *
37 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
38 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
39 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
40 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
41 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
42 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
43 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
44 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
45 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
46 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
47 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
48 * OF THE POSSIBILITY OF SUCH DAMAGE.
49 * ====================================================================
50 *
51 * This product includes cryptographic software written by Eric Young
52 * (eay@cryptsoft.com).  This product includes software written by Tim
53 * Hudson (tjh@cryptsoft.com). */
54
55#include <openssl/dsa.h>
56
57#include <assert.h>
58
59#include <openssl/bn.h>
60#include <openssl/bytestring.h>
61#include <openssl/err.h>
62#include <openssl/mem.h>
63
64#include "../bytestring/internal.h"
65
66
67static int parse_integer(CBS *cbs, BIGNUM **out) {
68  assert(*out == NULL);
69  *out = BN_new();
70  if (*out == NULL) {
71    return 0;
72  }
73  return BN_parse_asn1_unsigned(cbs, *out);
74}
75
76static int marshal_integer(CBB *cbb, BIGNUM *bn) {
77  if (bn == NULL) {
78    // A DSA object may be missing some components.
79    OPENSSL_PUT_ERROR(DSA, ERR_R_PASSED_NULL_PARAMETER);
80    return 0;
81  }
82  return BN_marshal_asn1(cbb, bn);
83}
84
85DSA_SIG *DSA_SIG_parse(CBS *cbs) {
86  DSA_SIG *ret = DSA_SIG_new();
87  if (ret == NULL) {
88    return NULL;
89  }
90  CBS child;
91  if (!CBS_get_asn1(cbs, &child, CBS_ASN1_SEQUENCE) ||
92      !parse_integer(&child, &ret->r) ||
93      !parse_integer(&child, &ret->s) ||
94      CBS_len(&child) != 0) {
95    OPENSSL_PUT_ERROR(DSA, DSA_R_DECODE_ERROR);
96    DSA_SIG_free(ret);
97    return NULL;
98  }
99  return ret;
100}
101
102int DSA_SIG_marshal(CBB *cbb, const DSA_SIG *sig) {
103  CBB child;
104  if (!CBB_add_asn1(cbb, &child, CBS_ASN1_SEQUENCE) ||
105      !marshal_integer(&child, sig->r) ||
106      !marshal_integer(&child, sig->s) ||
107      !CBB_flush(cbb)) {
108    OPENSSL_PUT_ERROR(DSA, DSA_R_ENCODE_ERROR);
109    return 0;
110  }
111  return 1;
112}
113
114DSA *DSA_parse_public_key(CBS *cbs) {
115  DSA *ret = DSA_new();
116  if (ret == NULL) {
117    return NULL;
118  }
119  CBS child;
120  if (!CBS_get_asn1(cbs, &child, CBS_ASN1_SEQUENCE) ||
121      !parse_integer(&child, &ret->pub_key) ||
122      !parse_integer(&child, &ret->p) ||
123      !parse_integer(&child, &ret->q) ||
124      !parse_integer(&child, &ret->g) ||
125      CBS_len(&child) != 0) {
126    OPENSSL_PUT_ERROR(DSA, DSA_R_DECODE_ERROR);
127    DSA_free(ret);
128    return NULL;
129  }
130  return ret;
131}
132
133int DSA_marshal_public_key(CBB *cbb, const DSA *dsa) {
134  CBB child;
135  if (!CBB_add_asn1(cbb, &child, CBS_ASN1_SEQUENCE) ||
136      !marshal_integer(&child, dsa->pub_key) ||
137      !marshal_integer(&child, dsa->p) ||
138      !marshal_integer(&child, dsa->q) ||
139      !marshal_integer(&child, dsa->g) ||
140      !CBB_flush(cbb)) {
141    OPENSSL_PUT_ERROR(DSA, DSA_R_ENCODE_ERROR);
142    return 0;
143  }
144  return 1;
145}
146
147DSA *DSA_parse_parameters(CBS *cbs) {
148  DSA *ret = DSA_new();
149  if (ret == NULL) {
150    return NULL;
151  }
152  CBS child;
153  if (!CBS_get_asn1(cbs, &child, CBS_ASN1_SEQUENCE) ||
154      !parse_integer(&child, &ret->p) ||
155      !parse_integer(&child, &ret->q) ||
156      !parse_integer(&child, &ret->g) ||
157      CBS_len(&child) != 0) {
158    OPENSSL_PUT_ERROR(DSA, DSA_R_DECODE_ERROR);
159    DSA_free(ret);
160    return NULL;
161  }
162  return ret;
163}
164
165int DSA_marshal_parameters(CBB *cbb, const DSA *dsa) {
166  CBB child;
167  if (!CBB_add_asn1(cbb, &child, CBS_ASN1_SEQUENCE) ||
168      !marshal_integer(&child, dsa->p) ||
169      !marshal_integer(&child, dsa->q) ||
170      !marshal_integer(&child, dsa->g) ||
171      !CBB_flush(cbb)) {
172    OPENSSL_PUT_ERROR(DSA, DSA_R_ENCODE_ERROR);
173    return 0;
174  }
175  return 1;
176}
177
178DSA *DSA_parse_private_key(CBS *cbs) {
179  DSA *ret = DSA_new();
180  if (ret == NULL) {
181    return NULL;
182  }
183
184  CBS child;
185  uint64_t version;
186  if (!CBS_get_asn1(cbs, &child, CBS_ASN1_SEQUENCE) ||
187      !CBS_get_asn1_uint64(&child, &version)) {
188    OPENSSL_PUT_ERROR(DSA, DSA_R_DECODE_ERROR);
189    goto err;
190  }
191
192  if (version != 0) {
193    OPENSSL_PUT_ERROR(DSA, DSA_R_BAD_VERSION);
194    goto err;
195  }
196
197  if (!parse_integer(&child, &ret->p) ||
198      !parse_integer(&child, &ret->q) ||
199      !parse_integer(&child, &ret->g) ||
200      !parse_integer(&child, &ret->pub_key) ||
201      !parse_integer(&child, &ret->priv_key) ||
202      CBS_len(&child) != 0) {
203    OPENSSL_PUT_ERROR(DSA, DSA_R_DECODE_ERROR);
204    goto err;
205  }
206  return ret;
207
208err:
209  DSA_free(ret);
210  return NULL;
211}
212
213int DSA_marshal_private_key(CBB *cbb, const DSA *dsa) {
214  CBB child;
215  if (!CBB_add_asn1(cbb, &child, CBS_ASN1_SEQUENCE) ||
216      !CBB_add_asn1_uint64(&child, 0 /* version */) ||
217      !marshal_integer(&child, dsa->p) ||
218      !marshal_integer(&child, dsa->q) ||
219      !marshal_integer(&child, dsa->g) ||
220      !marshal_integer(&child, dsa->pub_key) ||
221      !marshal_integer(&child, dsa->priv_key) ||
222      !CBB_flush(cbb)) {
223    OPENSSL_PUT_ERROR(DSA, DSA_R_ENCODE_ERROR);
224    return 0;
225  }
226  return 1;
227}
228
229DSA_SIG *d2i_DSA_SIG(DSA_SIG **out_sig, const uint8_t **inp, long len) {
230  if (len < 0) {
231    return NULL;
232  }
233  CBS cbs;
234  CBS_init(&cbs, *inp, (size_t)len);
235  DSA_SIG *ret = DSA_SIG_parse(&cbs);
236  if (ret == NULL) {
237    return NULL;
238  }
239  if (out_sig != NULL) {
240    DSA_SIG_free(*out_sig);
241    *out_sig = ret;
242  }
243  *inp = CBS_data(&cbs);
244  return ret;
245}
246
247int i2d_DSA_SIG(const DSA_SIG *in, uint8_t **outp) {
248  CBB cbb;
249  if (!CBB_init(&cbb, 0) ||
250      !DSA_SIG_marshal(&cbb, in)) {
251    CBB_cleanup(&cbb);
252    return -1;
253  }
254  return CBB_finish_i2d(&cbb, outp);
255}
256
257DSA *d2i_DSAPublicKey(DSA **out, const uint8_t **inp, long len) {
258  if (len < 0) {
259    return NULL;
260  }
261  CBS cbs;
262  CBS_init(&cbs, *inp, (size_t)len);
263  DSA *ret = DSA_parse_public_key(&cbs);
264  if (ret == NULL) {
265    return NULL;
266  }
267  if (out != NULL) {
268    DSA_free(*out);
269    *out = ret;
270  }
271  *inp = CBS_data(&cbs);
272  return ret;
273}
274
275int i2d_DSAPublicKey(const DSA *in, uint8_t **outp) {
276  CBB cbb;
277  if (!CBB_init(&cbb, 0) ||
278      !DSA_marshal_public_key(&cbb, in)) {
279    CBB_cleanup(&cbb);
280    return -1;
281  }
282  return CBB_finish_i2d(&cbb, outp);
283}
284
285DSA *d2i_DSAPrivateKey(DSA **out, const uint8_t **inp, long len) {
286  if (len < 0) {
287    return NULL;
288  }
289  CBS cbs;
290  CBS_init(&cbs, *inp, (size_t)len);
291  DSA *ret = DSA_parse_private_key(&cbs);
292  if (ret == NULL) {
293    return NULL;
294  }
295  if (out != NULL) {
296    DSA_free(*out);
297    *out = ret;
298  }
299  *inp = CBS_data(&cbs);
300  return ret;
301}
302
303int i2d_DSAPrivateKey(const DSA *in, uint8_t **outp) {
304  CBB cbb;
305  if (!CBB_init(&cbb, 0) ||
306      !DSA_marshal_private_key(&cbb, in)) {
307    CBB_cleanup(&cbb);
308    return -1;
309  }
310  return CBB_finish_i2d(&cbb, outp);
311}
312
313DSA *d2i_DSAparams(DSA **out, const uint8_t **inp, long len) {
314  if (len < 0) {
315    return NULL;
316  }
317  CBS cbs;
318  CBS_init(&cbs, *inp, (size_t)len);
319  DSA *ret = DSA_parse_parameters(&cbs);
320  if (ret == NULL) {
321    return NULL;
322  }
323  if (out != NULL) {
324    DSA_free(*out);
325    *out = ret;
326  }
327  *inp = CBS_data(&cbs);
328  return ret;
329}
330
331int i2d_DSAparams(const DSA *in, uint8_t **outp) {
332  CBB cbb;
333  if (!CBB_init(&cbb, 0) ||
334      !DSA_marshal_parameters(&cbb, in)) {
335    CBB_cleanup(&cbb);
336    return -1;
337  }
338  return CBB_finish_i2d(&cbb, outp);
339}
340