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1 | /* crypto/dsa/dsa_lib.c */ | |
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 | #include "cryptlib.h" | |
63 | #include <openssl/bn.h> | |
64 | #include <openssl/dsa.h> | |
65 | #include <openssl/asn1.h> | |
66 | #include <openssl/engine.h> | |
67 | ||
68 | const char *DSA_version="DSA" OPENSSL_VERSION_PTEXT; | |
69 | ||
70 | static const DSA_METHOD *default_DSA_method; | |
71 | static int dsa_meth_num = 0; | |
72 | static STACK_OF(CRYPTO_EX_DATA_FUNCS) *dsa_meth = NULL; | |
73 | ||
74 | void DSA_set_default_openssl_method(const DSA_METHOD *meth) | |
75 | { | |
76 | ENGINE *e; | |
77 | /* We'll need to notify the "openssl" ENGINE of this | |
78 | * change too. We won't bother locking things down at | |
79 | * our end as there was never any locking in these | |
80 | * functions! */ | |
81 | if(default_DSA_method != meth) | |
82 | { | |
83 | default_DSA_method = meth; | |
84 | e = ENGINE_by_id("openssl"); | |
85 | if(e) | |
86 | { | |
87 | ENGINE_set_DSA(e, meth); | |
88 | ENGINE_free(e); | |
89 | } | |
90 | } | |
91 | } | |
92 | ||
93 | const DSA_METHOD *DSA_get_default_openssl_method(void) | |
94 | { | |
95 | if(!default_DSA_method) default_DSA_method = DSA_OpenSSL(); | |
96 | return default_DSA_method; | |
97 | } | |
98 | ||
99 | DSA *DSA_new(void) | |
100 | { | |
101 | return DSA_new_method(NULL); | |
102 | } | |
103 | ||
104 | #if 0 | |
105 | DSA_METHOD *DSA_set_method(DSA *dsa, DSA_METHOD *meth) | |
106 | { | |
107 | DSA_METHOD *mtmp; | |
108 | mtmp = dsa->meth; | |
109 | if (mtmp->finish) mtmp->finish(dsa); | |
110 | dsa->meth = meth; | |
111 | if (meth->init) meth->init(dsa); | |
112 | return mtmp; | |
113 | } | |
114 | #else | |
115 | int DSA_set_method(DSA *dsa, ENGINE *engine) | |
116 | { | |
117 | ENGINE *mtmp; | |
118 | const DSA_METHOD *meth; | |
119 | mtmp = dsa->engine; | |
120 | meth = ENGINE_get_DSA(mtmp); | |
121 | if (!ENGINE_init(engine)) | |
122 | return 0; | |
123 | if (meth->finish) meth->finish(dsa); | |
124 | dsa->engine = engine; | |
125 | meth = ENGINE_get_DSA(engine); | |
126 | if (meth->init) meth->init(dsa); | |
127 | /* SHOULD ERROR CHECK THIS!!! */ | |
128 | ENGINE_finish(mtmp); | |
129 | return 1; | |
130 | } | |
131 | #endif | |
132 | ||
133 | ||
134 | #if 0 | |
135 | DSA *DSA_new_method(DSA_METHOD *meth) | |
136 | #else | |
137 | DSA *DSA_new_method(ENGINE *engine) | |
138 | #endif | |
139 | { | |
140 | const DSA_METHOD *meth; | |
141 | DSA *ret; | |
142 | ||
143 | ret=(DSA *)OPENSSL_malloc(sizeof(DSA)); | |
144 | if (ret == NULL) | |
145 | { | |
146 | DSAerr(DSA_F_DSA_NEW,ERR_R_MALLOC_FAILURE); | |
147 | return(NULL); | |
148 | } | |
149 | if(engine) | |
150 | ret->engine = engine; | |
151 | else | |
152 | { | |
153 | if((ret->engine=ENGINE_get_default_DSA()) == NULL) | |
154 | { | |
155 | OPENSSL_free(ret); | |
156 | return NULL; | |
157 | } | |
158 | } | |
159 | meth = ENGINE_get_DSA(ret->engine); | |
160 | ret->pad=0; | |
161 | ret->version=0; | |
162 | ret->write_params=1; | |
163 | ret->p=NULL; | |
164 | ret->q=NULL; | |
165 | ret->g=NULL; | |
166 | ||
167 | ret->pub_key=NULL; | |
168 | ret->priv_key=NULL; | |
169 | ||
170 | ret->kinv=NULL; | |
171 | ret->r=NULL; | |
172 | ret->method_mont_p=NULL; | |
173 | ||
174 | ret->references=1; | |
175 | ret->flags=meth->flags; | |
176 | CRYPTO_new_ex_data(dsa_meth,ret,&ret->ex_data); | |
177 | if ((meth->init != NULL) && !meth->init(ret)) | |
178 | { | |
179 | CRYPTO_free_ex_data(dsa_meth,ret,&ret->ex_data); | |
180 | OPENSSL_free(ret); | |
181 | ret=NULL; | |
182 | } | |
183 | ||
184 | return(ret); | |
185 | } | |
186 | ||
187 | void DSA_free(DSA *r) | |
188 | { | |
189 | const DSA_METHOD *meth; | |
190 | int i; | |
191 | ||
192 | if (r == NULL) return; | |
193 | ||
194 | i=CRYPTO_add(&r->references,-1,CRYPTO_LOCK_DSA); | |
195 | #ifdef REF_PRINT | |
196 | REF_PRINT("DSA",r); | |
197 | #endif | |
198 | if (i > 0) return; | |
199 | #ifdef REF_CHECK | |
200 | if (i < 0) | |
201 | { | |
202 | fprintf(stderr,"DSA_free, bad reference count\n"); | |
203 | abort(); | |
204 | } | |
205 | #endif | |
206 | ||
207 | meth = ENGINE_get_DSA(r->engine); | |
208 | if(meth->finish) meth->finish(r); | |
209 | ENGINE_finish(r->engine); | |
210 | ||
211 | CRYPTO_free_ex_data(dsa_meth, r, &r->ex_data); | |
212 | ||
213 | if (r->p != NULL) BN_clear_free(r->p); | |
214 | if (r->q != NULL) BN_clear_free(r->q); | |
215 | if (r->g != NULL) BN_clear_free(r->g); | |
216 | if (r->pub_key != NULL) BN_clear_free(r->pub_key); | |
217 | if (r->priv_key != NULL) BN_clear_free(r->priv_key); | |
218 | if (r->kinv != NULL) BN_clear_free(r->kinv); | |
219 | if (r->r != NULL) BN_clear_free(r->r); | |
220 | OPENSSL_free(r); | |
221 | } | |
222 | ||
223 | int DSA_size(const DSA *r) | |
224 | { | |
225 | int ret,i; | |
226 | ASN1_INTEGER bs; | |
227 | unsigned char buf[4]; | |
228 | ||
229 | i=BN_num_bits(r->q); | |
230 | bs.length=(i+7)/8; | |
231 | bs.data=buf; | |
232 | bs.type=V_ASN1_INTEGER; | |
233 | /* If the top bit is set the asn1 encoding is 1 larger. */ | |
234 | buf[0]=0xff; | |
235 | ||
236 | i=i2d_ASN1_INTEGER(&bs,NULL); | |
237 | i+=i; /* r and s */ | |
238 | ret=ASN1_object_size(1,i,V_ASN1_SEQUENCE); | |
239 | return(ret); | |
240 | } | |
241 | ||
242 | int DSA_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 | dsa_meth_num++; | |
246 | return(CRYPTO_get_ex_new_index(dsa_meth_num-1, | |
247 | &dsa_meth,argl,argp,new_func,dup_func,free_func)); | |
248 | } | |
249 | ||
250 | int DSA_set_ex_data(DSA *d, int idx, void *arg) | |
251 | { | |
252 | return(CRYPTO_set_ex_data(&d->ex_data,idx,arg)); | |
253 | } | |
254 | ||
255 | void *DSA_get_ex_data(DSA *d, int idx) | |
256 | { | |
257 | return(CRYPTO_get_ex_data(&d->ex_data,idx)); | |
258 | } | |
259 | ||
260 | #ifndef NO_DH | |
261 | DH *DSA_dup_DH(const DSA *r) | |
262 | { | |
263 | /* DSA has p, q, g, optional pub_key, optional priv_key. | |
264 | * DH has p, optional length, g, optional pub_key, optional priv_key. | |
265 | */ | |
266 | ||
267 | DH *ret = NULL; | |
268 | ||
269 | if (r == NULL) | |
270 | goto err; | |
271 | ret = DH_new(); | |
272 | if (ret == NULL) | |
273 | goto err; | |
274 | if (r->p != NULL) | |
275 | if ((ret->p = BN_dup(r->p)) == NULL) | |
276 | goto err; | |
277 | if (r->q != NULL) | |
278 | ret->length = BN_num_bits(r->q); | |
279 | if (r->g != NULL) | |
280 | if ((ret->g = BN_dup(r->g)) == NULL) | |
281 | goto err; | |
282 | if (r->pub_key != NULL) | |
283 | if ((ret->pub_key = BN_dup(r->pub_key)) == NULL) | |
284 | goto err; | |
285 | if (r->priv_key != NULL) | |
286 | if ((ret->priv_key = BN_dup(r->priv_key)) == NULL) | |
287 | goto err; | |
288 | ||
289 | return ret; | |
290 | ||
291 | err: | |
292 | if (ret != NULL) | |
293 | DH_free(ret); | |
294 | return NULL; | |
295 | } | |
296 | #endif |