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d02b48c6 | 1 | /* crypto/dsa/dsa_lib.c */ |
58964a49 | 2 | /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) |
d02b48c6 RE |
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. | |
0f113f3e | 8 | * |
d02b48c6 RE |
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). | |
0f113f3e | 15 | * |
d02b48c6 RE |
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. | |
0f113f3e | 22 | * |
d02b48c6 RE |
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 :-). | |
0f113f3e | 37 | * 4. If you include any Windows specific code (or a derivative thereof) from |
d02b48c6 RE |
38 | * the apps directory (application code) you must include an acknowledgement: |
39 | * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" | |
0f113f3e | 40 | * |
d02b48c6 RE |
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. | |
0f113f3e | 52 | * |
d02b48c6 RE |
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 | ||
651d0aff | 59 | /* Original version from Steven Schoch <schoch@sheba.arc.nasa.gov> */ |
d02b48c6 RE |
60 | |
61 | #include <stdio.h> | |
62 | #include "cryptlib.h" | |
ec577822 BM |
63 | #include <openssl/bn.h> |
64 | #include <openssl/dsa.h> | |
65 | #include <openssl/asn1.h> | |
0b13e9f0 | 66 | #ifndef OPENSSL_NO_ENGINE |
0f113f3e | 67 | # include <openssl/engine.h> |
0b13e9f0 | 68 | #endif |
3eeaab4b | 69 | #ifndef OPENSSL_NO_DH |
0f113f3e | 70 | # include <openssl/dh.h> |
3eeaab4b | 71 | #endif |
d02b48c6 | 72 | |
0f113f3e | 73 | const char DSA_version[] = "DSA" OPENSSL_VERSION_PTEXT; |
d02b48c6 | 74 | |
a75b1915 | 75 | static const DSA_METHOD *default_DSA_method = NULL; |
c0711f7f | 76 | |
cb78486d | 77 | void DSA_set_default_method(const DSA_METHOD *meth) |
0f113f3e MC |
78 | { |
79 | default_DSA_method = meth; | |
80 | } | |
c0711f7f | 81 | |
cb78486d | 82 | const DSA_METHOD *DSA_get_default_method(void) |
0f113f3e MC |
83 | { |
84 | if (!default_DSA_method) | |
85 | default_DSA_method = DSA_OpenSSL(); | |
86 | return default_DSA_method; | |
87 | } | |
c0711f7f | 88 | |
6b691a5c | 89 | DSA *DSA_new(void) |
0f113f3e MC |
90 | { |
91 | return DSA_new_method(NULL); | |
92 | } | |
c0711f7f | 93 | |
cb78486d | 94 | int DSA_set_method(DSA *dsa, const DSA_METHOD *meth) |
0f113f3e MC |
95 | { |
96 | /* | |
97 | * NB: The caller is specifically setting a method, so it's not up to us | |
98 | * to deal with which ENGINE it comes from. | |
99 | */ | |
100 | const DSA_METHOD *mtmp; | |
101 | mtmp = dsa->meth; | |
102 | if (mtmp->finish) | |
103 | mtmp->finish(dsa); | |
0b13e9f0 | 104 | #ifndef OPENSSL_NO_ENGINE |
0f113f3e MC |
105 | if (dsa->engine) { |
106 | ENGINE_finish(dsa->engine); | |
107 | dsa->engine = NULL; | |
108 | } | |
0b13e9f0 | 109 | #endif |
0f113f3e MC |
110 | dsa->meth = meth; |
111 | if (meth->init) | |
112 | meth->init(dsa); | |
113 | return 1; | |
114 | } | |
c0711f7f | 115 | |
5270e702 | 116 | DSA *DSA_new_method(ENGINE *engine) |
0f113f3e MC |
117 | { |
118 | DSA *ret; | |
119 | ||
b196e7d9 | 120 | ret = OPENSSL_malloc(sizeof(DSA)); |
0f113f3e MC |
121 | if (ret == NULL) { |
122 | DSAerr(DSA_F_DSA_NEW_METHOD, ERR_R_MALLOC_FAILURE); | |
123 | return (NULL); | |
124 | } | |
125 | ret->meth = DSA_get_default_method(); | |
0b13e9f0 | 126 | #ifndef OPENSSL_NO_ENGINE |
0f113f3e MC |
127 | if (engine) { |
128 | if (!ENGINE_init(engine)) { | |
129 | DSAerr(DSA_F_DSA_NEW_METHOD, ERR_R_ENGINE_LIB); | |
130 | OPENSSL_free(ret); | |
131 | return NULL; | |
132 | } | |
133 | ret->engine = engine; | |
134 | } else | |
135 | ret->engine = ENGINE_get_default_DSA(); | |
136 | if (ret->engine) { | |
137 | ret->meth = ENGINE_get_DSA(ret->engine); | |
138 | if (!ret->meth) { | |
139 | DSAerr(DSA_F_DSA_NEW_METHOD, ERR_R_ENGINE_LIB); | |
140 | ENGINE_finish(ret->engine); | |
141 | OPENSSL_free(ret); | |
142 | return NULL; | |
143 | } | |
144 | } | |
0b13e9f0 | 145 | #endif |
0c9de428 | 146 | |
0f113f3e MC |
147 | ret->pad = 0; |
148 | ret->version = 0; | |
0f113f3e MC |
149 | ret->p = NULL; |
150 | ret->q = NULL; | |
151 | ret->g = NULL; | |
152 | ||
153 | ret->pub_key = NULL; | |
154 | ret->priv_key = NULL; | |
155 | ||
156 | ret->kinv = NULL; | |
157 | ret->r = NULL; | |
158 | ret->method_mont_p = NULL; | |
159 | ||
160 | ret->references = 1; | |
161 | ret->flags = ret->meth->flags & ~DSA_FLAG_NON_FIPS_ALLOW; | |
162 | CRYPTO_new_ex_data(CRYPTO_EX_INDEX_DSA, ret, &ret->ex_data); | |
163 | if ((ret->meth->init != NULL) && !ret->meth->init(ret)) { | |
0b13e9f0 | 164 | #ifndef OPENSSL_NO_ENGINE |
0f113f3e MC |
165 | if (ret->engine) |
166 | ENGINE_finish(ret->engine); | |
0b13e9f0 | 167 | #endif |
0f113f3e MC |
168 | CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DSA, ret, &ret->ex_data); |
169 | OPENSSL_free(ret); | |
170 | ret = NULL; | |
171 | } | |
172 | ||
173 | return (ret); | |
174 | } | |
d02b48c6 | 175 | |
6b691a5c | 176 | void DSA_free(DSA *r) |
0f113f3e MC |
177 | { |
178 | int i; | |
d02b48c6 | 179 | |
0f113f3e MC |
180 | if (r == NULL) |
181 | return; | |
d02b48c6 | 182 | |
0f113f3e | 183 | i = CRYPTO_add(&r->references, -1, CRYPTO_LOCK_DSA); |
58964a49 | 184 | #ifdef REF_PRINT |
0f113f3e | 185 | REF_PRINT("DSA", r); |
58964a49 | 186 | #endif |
0f113f3e MC |
187 | if (i > 0) |
188 | return; | |
d02b48c6 | 189 | #ifdef REF_CHECK |
0f113f3e MC |
190 | if (i < 0) { |
191 | fprintf(stderr, "DSA_free, bad reference count\n"); | |
192 | abort(); | |
193 | } | |
d02b48c6 RE |
194 | #endif |
195 | ||
0f113f3e MC |
196 | if (r->meth->finish) |
197 | r->meth->finish(r); | |
0b13e9f0 | 198 | #ifndef OPENSSL_NO_ENGINE |
0f113f3e MC |
199 | if (r->engine) |
200 | ENGINE_finish(r->engine); | |
0b13e9f0 | 201 | #endif |
c0711f7f | 202 | |
0f113f3e MC |
203 | CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DSA, r, &r->ex_data); |
204 | ||
205 | if (r->p != NULL) | |
206 | BN_clear_free(r->p); | |
207 | if (r->q != NULL) | |
208 | BN_clear_free(r->q); | |
209 | if (r->g != NULL) | |
210 | BN_clear_free(r->g); | |
211 | if (r->pub_key != NULL) | |
212 | BN_clear_free(r->pub_key); | |
213 | if (r->priv_key != NULL) | |
214 | BN_clear_free(r->priv_key); | |
215 | if (r->kinv != NULL) | |
216 | BN_clear_free(r->kinv); | |
217 | if (r->r != NULL) | |
218 | BN_clear_free(r->r); | |
219 | OPENSSL_free(r); | |
220 | } | |
d02b48c6 | 221 | |
6ac4e8bd | 222 | int DSA_up_ref(DSA *r) |
0f113f3e MC |
223 | { |
224 | int i = CRYPTO_add(&r->references, 1, CRYPTO_LOCK_DSA); | |
5cbc2e8b | 225 | #ifdef REF_PRINT |
0f113f3e | 226 | REF_PRINT("DSA", r); |
5cbc2e8b GT |
227 | #endif |
228 | #ifdef REF_CHECK | |
0f113f3e MC |
229 | if (i < 2) { |
230 | fprintf(stderr, "DSA_up_ref, bad reference count\n"); | |
231 | abort(); | |
232 | } | |
5cbc2e8b | 233 | #endif |
0f113f3e MC |
234 | return ((i > 1) ? 1 : 0); |
235 | } | |
5cbc2e8b | 236 | |
a4aba800 | 237 | int DSA_size(const DSA *r) |
0f113f3e MC |
238 | { |
239 | int ret, i; | |
240 | ASN1_INTEGER bs; | |
241 | unsigned char buf[4]; /* 4 bytes looks really small. However, | |
242 | * i2d_ASN1_INTEGER() will not look beyond | |
243 | * the first byte, as long as the second | |
244 | * parameter is NULL. */ | |
245 | ||
246 | i = BN_num_bits(r->q); | |
247 | bs.length = (i + 7) / 8; | |
248 | bs.data = buf; | |
249 | bs.type = V_ASN1_INTEGER; | |
250 | /* If the top bit is set the asn1 encoding is 1 larger. */ | |
251 | buf[0] = 0xff; | |
252 | ||
253 | i = i2d_ASN1_INTEGER(&bs, NULL); | |
254 | i += i; /* r and s */ | |
255 | ret = ASN1_object_size(1, i, V_ASN1_SEQUENCE); | |
256 | return (ret); | |
257 | } | |
d02b48c6 | 258 | |
dd9d233e | 259 | int DSA_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func, |
0f113f3e MC |
260 | CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func) |
261 | { | |
262 | return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_DSA, argl, argp, | |
263 | new_func, dup_func, free_func); | |
264 | } | |
c0711f7f | 265 | |
dd9d233e | 266 | int DSA_set_ex_data(DSA *d, int idx, void *arg) |
0f113f3e MC |
267 | { |
268 | return (CRYPTO_set_ex_data(&d->ex_data, idx, arg)); | |
269 | } | |
c0711f7f | 270 | |
dd9d233e | 271 | void *DSA_get_ex_data(DSA *d, int idx) |
0f113f3e MC |
272 | { |
273 | return (CRYPTO_get_ex_data(&d->ex_data, idx)); | |
274 | } | |
c0711f7f | 275 | |
2514fa79 | 276 | int DSA_security_bits(const DSA *d) |
0f113f3e MC |
277 | { |
278 | return BN_security_bits(BN_num_bits(d->p), BN_num_bits(d->q)); | |
279 | } | |
2514fa79 | 280 | |
cf1b7d96 | 281 | #ifndef OPENSSL_NO_DH |
a4aba800 | 282 | DH *DSA_dup_DH(const DSA *r) |
0f113f3e MC |
283 | { |
284 | /* | |
285 | * DSA has p, q, g, optional pub_key, optional priv_key. DH has p, | |
286 | * optional length, g, optional pub_key, optional priv_key, optional q. | |
287 | */ | |
288 | ||
289 | DH *ret = NULL; | |
290 | ||
291 | if (r == NULL) | |
292 | goto err; | |
293 | ret = DH_new(); | |
294 | if (ret == NULL) | |
295 | goto err; | |
296 | if (r->p != NULL) | |
297 | if ((ret->p = BN_dup(r->p)) == NULL) | |
298 | goto err; | |
299 | if (r->q != NULL) { | |
300 | ret->length = BN_num_bits(r->q); | |
301 | if ((ret->q = BN_dup(r->q)) == NULL) | |
302 | goto err; | |
303 | } | |
304 | if (r->g != NULL) | |
305 | if ((ret->g = BN_dup(r->g)) == NULL) | |
306 | goto err; | |
307 | if (r->pub_key != NULL) | |
308 | if ((ret->pub_key = BN_dup(r->pub_key)) == NULL) | |
309 | goto err; | |
310 | if (r->priv_key != NULL) | |
311 | if ((ret->priv_key = BN_dup(r->priv_key)) == NULL) | |
312 | goto err; | |
313 | ||
314 | return ret; | |
48c843c3 BM |
315 | |
316 | err: | |
d6407083 | 317 | DH_free(ret); |
0f113f3e MC |
318 | return NULL; |
319 | } | |
48c843c3 | 320 | #endif |