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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. | |
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 | ||
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 |
5270e702 | 67 | #include <openssl/engine.h> |
0b13e9f0 | 68 | #endif |
3eeaab4b | 69 | #ifndef OPENSSL_NO_DH |
60a938c6 | 70 | #include <openssl/dh.h> |
3eeaab4b | 71 | #endif |
d02b48c6 | 72 | |
560b79cb | 73 | const char DSA_version[]="DSA" OPENSSL_VERSION_PTEXT; |
d02b48c6 | 74 | |
a75b1915 | 75 | static const DSA_METHOD *default_DSA_method = NULL; |
c0711f7f | 76 | |
cb78486d GT |
77 | void DSA_set_default_method(const DSA_METHOD *meth) |
78 | { | |
79 | default_DSA_method = meth; | |
80 | } | |
c0711f7f | 81 | |
cb78486d GT |
82 | const DSA_METHOD *DSA_get_default_method(void) |
83 | { | |
84 | if(!default_DSA_method) | |
85 | default_DSA_method = DSA_OpenSSL(); | |
c0711f7f | 86 | return default_DSA_method; |
cb78486d | 87 | } |
c0711f7f | 88 | |
6b691a5c | 89 | DSA *DSA_new(void) |
cb78486d | 90 | { |
c0711f7f | 91 | return DSA_new_method(NULL); |
cb78486d | 92 | } |
c0711f7f | 93 | |
cb78486d GT |
94 | int DSA_set_method(DSA *dsa, const DSA_METHOD *meth) |
95 | { | |
96 | /* NB: The caller is specifically setting a method, so it's not up to us | |
97 | * to deal with which ENGINE it comes from. */ | |
98 | const DSA_METHOD *mtmp; | |
c0711f7f DSH |
99 | mtmp = dsa->meth; |
100 | if (mtmp->finish) mtmp->finish(dsa); | |
0b13e9f0 | 101 | #ifndef OPENSSL_NO_ENGINE |
cb78486d GT |
102 | if (dsa->engine) |
103 | { | |
104 | ENGINE_finish(dsa->engine); | |
105 | dsa->engine = NULL; | |
106 | } | |
0b13e9f0 | 107 | #endif |
c0711f7f DSH |
108 | dsa->meth = meth; |
109 | if (meth->init) meth->init(dsa); | |
cb78486d | 110 | return 1; |
5270e702 | 111 | } |
c0711f7f | 112 | |
5270e702 | 113 | DSA *DSA_new_method(ENGINE *engine) |
d02b48c6 RE |
114 | { |
115 | DSA *ret; | |
116 | ||
26a3a48d | 117 | ret=(DSA *)OPENSSL_malloc(sizeof(DSA)); |
d02b48c6 RE |
118 | if (ret == NULL) |
119 | { | |
0c372b94 | 120 | DSAerr(DSA_F_DSA_NEW_METHOD,ERR_R_MALLOC_FAILURE); |
d02b48c6 RE |
121 | return(NULL); |
122 | } | |
cb78486d | 123 | ret->meth = DSA_get_default_method(); |
0b13e9f0 | 124 | #ifndef OPENSSL_NO_ENGINE |
0c372b94 DSH |
125 | if (engine) |
126 | { | |
127 | if (!ENGINE_init(engine)) | |
128 | { | |
129 | DSAerr(DSA_F_DSA_NEW_METHOD, ERR_R_ENGINE_LIB); | |
130 | OPENSSL_free(ret); | |
131 | return NULL; | |
132 | } | |
133 | ret->engine = engine; | |
134 | } | |
135 | else | |
cb78486d GT |
136 | ret->engine = ENGINE_get_default_DSA(); |
137 | if(ret->engine) | |
5270e702 | 138 | { |
cb78486d GT |
139 | ret->meth = ENGINE_get_DSA(ret->engine); |
140 | if(!ret->meth) | |
141 | { | |
0c372b94 | 142 | DSAerr(DSA_F_DSA_NEW_METHOD, |
cb78486d GT |
143 | ERR_R_ENGINE_LIB); |
144 | ENGINE_finish(ret->engine); | |
145 | OPENSSL_free(ret); | |
146 | return NULL; | |
147 | } | |
5270e702 | 148 | } |
0b13e9f0 | 149 | #endif |
0c9de428 | 150 | |
d02b48c6 RE |
151 | ret->pad=0; |
152 | ret->version=0; | |
153 | ret->write_params=1; | |
154 | ret->p=NULL; | |
155 | ret->q=NULL; | |
156 | ret->g=NULL; | |
157 | ||
158 | ret->pub_key=NULL; | |
159 | ret->priv_key=NULL; | |
160 | ||
161 | ret->kinv=NULL; | |
162 | ret->r=NULL; | |
dfeab068 | 163 | ret->method_mont_p=NULL; |
d02b48c6 RE |
164 | |
165 | ret->references=1; | |
cb78486d | 166 | ret->flags=ret->meth->flags; |
79aa04ef | 167 | CRYPTO_new_ex_data(CRYPTO_EX_INDEX_DSA, ret, &ret->ex_data); |
cb78486d | 168 | if ((ret->meth->init != NULL) && !ret->meth->init(ret)) |
c0711f7f | 169 | { |
0b13e9f0 | 170 | #ifndef OPENSSL_NO_ENGINE |
0c372b94 DSH |
171 | if (ret->engine) |
172 | ENGINE_finish(ret->engine); | |
0b13e9f0 | 173 | #endif |
79aa04ef | 174 | CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DSA, ret, &ret->ex_data); |
26a3a48d | 175 | OPENSSL_free(ret); |
c0711f7f DSH |
176 | ret=NULL; |
177 | } | |
c0711f7f | 178 | |
d02b48c6 RE |
179 | return(ret); |
180 | } | |
181 | ||
6b691a5c | 182 | void DSA_free(DSA *r) |
d02b48c6 RE |
183 | { |
184 | int i; | |
185 | ||
186 | if (r == NULL) return; | |
187 | ||
188 | i=CRYPTO_add(&r->references,-1,CRYPTO_LOCK_DSA); | |
58964a49 RE |
189 | #ifdef REF_PRINT |
190 | REF_PRINT("DSA",r); | |
191 | #endif | |
d02b48c6 RE |
192 | if (i > 0) return; |
193 | #ifdef REF_CHECK | |
194 | if (i < 0) | |
195 | { | |
196 | fprintf(stderr,"DSA_free, bad reference count\n"); | |
197 | abort(); | |
198 | } | |
199 | #endif | |
200 | ||
cb78486d GT |
201 | if(r->meth->finish) |
202 | r->meth->finish(r); | |
0b13e9f0 | 203 | #ifndef OPENSSL_NO_ENGINE |
cb78486d GT |
204 | if(r->engine) |
205 | ENGINE_finish(r->engine); | |
0b13e9f0 | 206 | #endif |
c0711f7f | 207 | |
79aa04ef | 208 | CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DSA, r, &r->ex_data); |
d50f1bdf | 209 | |
d02b48c6 RE |
210 | if (r->p != NULL) BN_clear_free(r->p); |
211 | if (r->q != NULL) BN_clear_free(r->q); | |
212 | if (r->g != NULL) BN_clear_free(r->g); | |
213 | if (r->pub_key != NULL) BN_clear_free(r->pub_key); | |
214 | if (r->priv_key != NULL) BN_clear_free(r->priv_key); | |
215 | if (r->kinv != NULL) BN_clear_free(r->kinv); | |
216 | if (r->r != NULL) BN_clear_free(r->r); | |
26a3a48d | 217 | OPENSSL_free(r); |
d02b48c6 RE |
218 | } |
219 | ||
6ac4e8bd | 220 | int DSA_up_ref(DSA *r) |
5cbc2e8b GT |
221 | { |
222 | int i = CRYPTO_add(&r->references, 1, CRYPTO_LOCK_DSA); | |
223 | #ifdef REF_PRINT | |
224 | REF_PRINT("DSA",r); | |
225 | #endif | |
226 | #ifdef REF_CHECK | |
227 | if (i < 2) | |
228 | { | |
6ac4e8bd | 229 | fprintf(stderr, "DSA_up_ref, bad reference count\n"); |
5cbc2e8b GT |
230 | abort(); |
231 | } | |
232 | #endif | |
233 | return ((i > 1) ? 1 : 0); | |
234 | } | |
235 | ||
a4aba800 | 236 | int DSA_size(const DSA *r) |
d02b48c6 RE |
237 | { |
238 | int ret,i; | |
239 | ASN1_INTEGER bs; | |
e9b553da RL |
240 | unsigned char buf[4]; /* 4 bytes looks really small. |
241 | However, i2d_ASN1_INTEGER() will not look | |
242 | beyond the first byte, as long as the second | |
243 | parameter is NULL. */ | |
d02b48c6 RE |
244 | |
245 | i=BN_num_bits(r->q); | |
246 | bs.length=(i+7)/8; | |
247 | bs.data=buf; | |
248 | bs.type=V_ASN1_INTEGER; | |
249 | /* If the top bit is set the asn1 encoding is 1 larger. */ | |
250 | buf[0]=0xff; | |
251 | ||
252 | i=i2d_ASN1_INTEGER(&bs,NULL); | |
253 | i+=i; /* r and s */ | |
254 | ret=ASN1_object_size(1,i,V_ASN1_SEQUENCE); | |
255 | return(ret); | |
256 | } | |
257 | ||
dd9d233e DSH |
258 | int DSA_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func, |
259 | CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func) | |
c0711f7f | 260 | { |
79aa04ef GT |
261 | return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_DSA, argl, argp, |
262 | new_func, dup_func, free_func); | |
c0711f7f DSH |
263 | } |
264 | ||
dd9d233e | 265 | int DSA_set_ex_data(DSA *d, int idx, void *arg) |
c0711f7f DSH |
266 | { |
267 | return(CRYPTO_set_ex_data(&d->ex_data,idx,arg)); | |
268 | } | |
269 | ||
dd9d233e | 270 | void *DSA_get_ex_data(DSA *d, int idx) |
c0711f7f DSH |
271 | { |
272 | return(CRYPTO_get_ex_data(&d->ex_data,idx)); | |
273 | } | |
274 | ||
cf1b7d96 | 275 | #ifndef OPENSSL_NO_DH |
a4aba800 | 276 | DH *DSA_dup_DH(const DSA *r) |
48c843c3 BM |
277 | { |
278 | /* DSA has p, q, g, optional pub_key, optional priv_key. | |
279 | * DH has p, optional length, g, optional pub_key, optional priv_key. | |
280 | */ | |
281 | ||
a12258fc | 282 | DH *ret = NULL; |
48c843c3 BM |
283 | |
284 | if (r == NULL) | |
285 | goto err; | |
286 | ret = DH_new(); | |
287 | if (ret == NULL) | |
288 | goto err; | |
289 | if (r->p != NULL) | |
290 | if ((ret->p = BN_dup(r->p)) == NULL) | |
291 | goto err; | |
292 | if (r->q != NULL) | |
293 | ret->length = BN_num_bits(r->q); | |
294 | if (r->g != NULL) | |
295 | if ((ret->g = BN_dup(r->g)) == NULL) | |
296 | goto err; | |
297 | if (r->pub_key != NULL) | |
298 | if ((ret->pub_key = BN_dup(r->pub_key)) == NULL) | |
299 | goto err; | |
300 | if (r->priv_key != NULL) | |
301 | if ((ret->priv_key = BN_dup(r->priv_key)) == NULL) | |
302 | goto err; | |
303 | ||
304 | return ret; | |
305 | ||
306 | err: | |
307 | if (ret != NULL) | |
308 | DH_free(ret); | |
309 | return NULL; | |
310 | } | |
311 | #endif |