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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> | |
b39fc560 | 62 | #include "internal/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 | |
a75b1915 | 73 | static const DSA_METHOD *default_DSA_method = NULL; |
c0711f7f | 74 | |
cb78486d | 75 | void DSA_set_default_method(const DSA_METHOD *meth) |
0f113f3e MC |
76 | { |
77 | default_DSA_method = meth; | |
78 | } | |
c0711f7f | 79 | |
cb78486d | 80 | const DSA_METHOD *DSA_get_default_method(void) |
0f113f3e MC |
81 | { |
82 | if (!default_DSA_method) | |
83 | default_DSA_method = DSA_OpenSSL(); | |
84 | return default_DSA_method; | |
85 | } | |
c0711f7f | 86 | |
6b691a5c | 87 | DSA *DSA_new(void) |
0f113f3e MC |
88 | { |
89 | return DSA_new_method(NULL); | |
90 | } | |
c0711f7f | 91 | |
cb78486d | 92 | int DSA_set_method(DSA *dsa, const DSA_METHOD *meth) |
0f113f3e MC |
93 | { |
94 | /* | |
95 | * NB: The caller is specifically setting a method, so it's not up to us | |
96 | * to deal with which ENGINE it comes from. | |
97 | */ | |
98 | const DSA_METHOD *mtmp; | |
99 | mtmp = dsa->meth; | |
100 | if (mtmp->finish) | |
101 | mtmp->finish(dsa); | |
0b13e9f0 | 102 | #ifndef OPENSSL_NO_ENGINE |
0f113f3e MC |
103 | if (dsa->engine) { |
104 | ENGINE_finish(dsa->engine); | |
105 | dsa->engine = NULL; | |
106 | } | |
0b13e9f0 | 107 | #endif |
0f113f3e MC |
108 | dsa->meth = meth; |
109 | if (meth->init) | |
110 | meth->init(dsa); | |
111 | return 1; | |
112 | } | |
c0711f7f | 113 | |
5270e702 | 114 | DSA *DSA_new_method(ENGINE *engine) |
0f113f3e MC |
115 | { |
116 | DSA *ret; | |
117 | ||
64b25758 | 118 | ret = OPENSSL_zalloc(sizeof(*ret)); |
0f113f3e MC |
119 | if (ret == NULL) { |
120 | DSAerr(DSA_F_DSA_NEW_METHOD, ERR_R_MALLOC_FAILURE); | |
121 | return (NULL); | |
122 | } | |
123 | ret->meth = DSA_get_default_method(); | |
0b13e9f0 | 124 | #ifndef OPENSSL_NO_ENGINE |
0f113f3e MC |
125 | if (engine) { |
126 | if (!ENGINE_init(engine)) { | |
127 | DSAerr(DSA_F_DSA_NEW_METHOD, ERR_R_ENGINE_LIB); | |
128 | OPENSSL_free(ret); | |
129 | return NULL; | |
130 | } | |
131 | ret->engine = engine; | |
132 | } else | |
133 | ret->engine = ENGINE_get_default_DSA(); | |
134 | if (ret->engine) { | |
135 | ret->meth = ENGINE_get_DSA(ret->engine); | |
136 | if (!ret->meth) { | |
137 | DSAerr(DSA_F_DSA_NEW_METHOD, ERR_R_ENGINE_LIB); | |
138 | ENGINE_finish(ret->engine); | |
139 | OPENSSL_free(ret); | |
140 | return NULL; | |
141 | } | |
142 | } | |
0b13e9f0 | 143 | #endif |
0c9de428 | 144 | |
0f113f3e MC |
145 | ret->references = 1; |
146 | ret->flags = ret->meth->flags & ~DSA_FLAG_NON_FIPS_ALLOW; | |
147 | CRYPTO_new_ex_data(CRYPTO_EX_INDEX_DSA, ret, &ret->ex_data); | |
148 | if ((ret->meth->init != NULL) && !ret->meth->init(ret)) { | |
0b13e9f0 | 149 | #ifndef OPENSSL_NO_ENGINE |
0f113f3e MC |
150 | if (ret->engine) |
151 | ENGINE_finish(ret->engine); | |
0b13e9f0 | 152 | #endif |
0f113f3e MC |
153 | CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DSA, ret, &ret->ex_data); |
154 | OPENSSL_free(ret); | |
155 | ret = NULL; | |
156 | } | |
157 | ||
158 | return (ret); | |
159 | } | |
d02b48c6 | 160 | |
6b691a5c | 161 | void DSA_free(DSA *r) |
0f113f3e MC |
162 | { |
163 | int i; | |
d02b48c6 | 164 | |
0f113f3e MC |
165 | if (r == NULL) |
166 | return; | |
d02b48c6 | 167 | |
0f113f3e | 168 | i = CRYPTO_add(&r->references, -1, CRYPTO_LOCK_DSA); |
58964a49 | 169 | #ifdef REF_PRINT |
0f113f3e | 170 | REF_PRINT("DSA", r); |
58964a49 | 171 | #endif |
0f113f3e MC |
172 | if (i > 0) |
173 | return; | |
d02b48c6 | 174 | #ifdef REF_CHECK |
0f113f3e MC |
175 | if (i < 0) { |
176 | fprintf(stderr, "DSA_free, bad reference count\n"); | |
177 | abort(); | |
178 | } | |
d02b48c6 RE |
179 | #endif |
180 | ||
0f113f3e MC |
181 | if (r->meth->finish) |
182 | r->meth->finish(r); | |
0b13e9f0 | 183 | #ifndef OPENSSL_NO_ENGINE |
0f113f3e MC |
184 | if (r->engine) |
185 | ENGINE_finish(r->engine); | |
0b13e9f0 | 186 | #endif |
c0711f7f | 187 | |
0f113f3e MC |
188 | CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DSA, r, &r->ex_data); |
189 | ||
23a1d5e9 RS |
190 | BN_clear_free(r->p); |
191 | BN_clear_free(r->q); | |
192 | BN_clear_free(r->g); | |
193 | BN_clear_free(r->pub_key); | |
194 | BN_clear_free(r->priv_key); | |
195 | BN_clear_free(r->kinv); | |
196 | BN_clear_free(r->r); | |
0f113f3e MC |
197 | OPENSSL_free(r); |
198 | } | |
d02b48c6 | 199 | |
6ac4e8bd | 200 | int DSA_up_ref(DSA *r) |
0f113f3e MC |
201 | { |
202 | int i = CRYPTO_add(&r->references, 1, CRYPTO_LOCK_DSA); | |
5cbc2e8b | 203 | #ifdef REF_PRINT |
0f113f3e | 204 | REF_PRINT("DSA", r); |
5cbc2e8b GT |
205 | #endif |
206 | #ifdef REF_CHECK | |
0f113f3e MC |
207 | if (i < 2) { |
208 | fprintf(stderr, "DSA_up_ref, bad reference count\n"); | |
209 | abort(); | |
210 | } | |
5cbc2e8b | 211 | #endif |
0f113f3e MC |
212 | return ((i > 1) ? 1 : 0); |
213 | } | |
5cbc2e8b | 214 | |
a4aba800 | 215 | int DSA_size(const DSA *r) |
0f113f3e MC |
216 | { |
217 | int ret, i; | |
218 | ASN1_INTEGER bs; | |
219 | unsigned char buf[4]; /* 4 bytes looks really small. However, | |
220 | * i2d_ASN1_INTEGER() will not look beyond | |
221 | * the first byte, as long as the second | |
222 | * parameter is NULL. */ | |
223 | ||
224 | i = BN_num_bits(r->q); | |
225 | bs.length = (i + 7) / 8; | |
226 | bs.data = buf; | |
227 | bs.type = V_ASN1_INTEGER; | |
228 | /* If the top bit is set the asn1 encoding is 1 larger. */ | |
229 | buf[0] = 0xff; | |
230 | ||
231 | i = i2d_ASN1_INTEGER(&bs, NULL); | |
232 | i += i; /* r and s */ | |
233 | ret = ASN1_object_size(1, i, V_ASN1_SEQUENCE); | |
234 | return (ret); | |
235 | } | |
d02b48c6 | 236 | |
dd9d233e | 237 | int DSA_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func, |
0f113f3e MC |
238 | CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func) |
239 | { | |
240 | return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_DSA, argl, argp, | |
241 | new_func, dup_func, free_func); | |
242 | } | |
c0711f7f | 243 | |
dd9d233e | 244 | int DSA_set_ex_data(DSA *d, int idx, void *arg) |
0f113f3e MC |
245 | { |
246 | return (CRYPTO_set_ex_data(&d->ex_data, idx, arg)); | |
247 | } | |
c0711f7f | 248 | |
dd9d233e | 249 | void *DSA_get_ex_data(DSA *d, int idx) |
0f113f3e MC |
250 | { |
251 | return (CRYPTO_get_ex_data(&d->ex_data, idx)); | |
252 | } | |
c0711f7f | 253 | |
2514fa79 | 254 | int DSA_security_bits(const DSA *d) |
0f113f3e MC |
255 | { |
256 | return BN_security_bits(BN_num_bits(d->p), BN_num_bits(d->q)); | |
257 | } | |
2514fa79 | 258 | |
cf1b7d96 | 259 | #ifndef OPENSSL_NO_DH |
a4aba800 | 260 | DH *DSA_dup_DH(const DSA *r) |
0f113f3e MC |
261 | { |
262 | /* | |
263 | * DSA has p, q, g, optional pub_key, optional priv_key. DH has p, | |
264 | * optional length, g, optional pub_key, optional priv_key, optional q. | |
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 ((ret->q = BN_dup(r->q)) == NULL) | |
280 | goto err; | |
281 | } | |
282 | if (r->g != NULL) | |
283 | if ((ret->g = BN_dup(r->g)) == NULL) | |
284 | goto err; | |
285 | if (r->pub_key != NULL) | |
286 | if ((ret->pub_key = BN_dup(r->pub_key)) == NULL) | |
287 | goto err; | |
288 | if (r->priv_key != NULL) | |
289 | if ((ret->priv_key = BN_dup(r->priv_key)) == NULL) | |
290 | goto err; | |
291 | ||
292 | return ret; | |
48c843c3 BM |
293 | |
294 | err: | |
d6407083 | 295 | DH_free(ret); |
0f113f3e MC |
296 | return NULL; |
297 | } | |
48c843c3 | 298 | #endif |