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4d94ae00 BM |
1 | /* crypto/ecdsa/ecs_lib.c */ |
2 | /* ==================================================================== | |
9dd84053 | 3 | * Copyright (c) 1998-2005 The OpenSSL Project. All rights reserved. |
4d94ae00 BM |
4 | * |
5 | * Redistribution and use in source and binary forms, with or without | |
6 | * modification, are permitted provided that the following conditions | |
7 | * are met: | |
8 | * | |
9 | * 1. Redistributions of source code must retain the above copyright | |
0f113f3e | 10 | * notice, this list of conditions and the following disclaimer. |
4d94ae00 BM |
11 | * |
12 | * 2. Redistributions in binary form must reproduce the above copyright | |
13 | * notice, this list of conditions and the following disclaimer in | |
14 | * the documentation and/or other materials provided with the | |
15 | * distribution. | |
16 | * | |
17 | * 3. All advertising materials mentioning features or use of this | |
18 | * software must display the following acknowledgment: | |
19 | * "This product includes software developed by the OpenSSL Project | |
20 | * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" | |
21 | * | |
22 | * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to | |
23 | * endorse or promote products derived from this software without | |
24 | * prior written permission. For written permission, please contact | |
25 | * openssl-core@OpenSSL.org. | |
26 | * | |
27 | * 5. Products derived from this software may not be called "OpenSSL" | |
28 | * nor may "OpenSSL" appear in their names without prior written | |
29 | * permission of the OpenSSL Project. | |
30 | * | |
31 | * 6. Redistributions of any form whatsoever must retain the following | |
32 | * acknowledgment: | |
33 | * "This product includes software developed by the OpenSSL Project | |
34 | * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" | |
35 | * | |
36 | * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY | |
37 | * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
38 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR | |
39 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR | |
40 | * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
41 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
42 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; | |
43 | * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
44 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, | |
45 | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | |
46 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED | |
47 | * OF THE POSSIBILITY OF SUCH DAMAGE. | |
48 | * ==================================================================== | |
49 | * | |
50 | * This product includes cryptographic software written by Eric Young | |
51 | * (eay@cryptsoft.com). This product includes software written by Tim | |
52 | * Hudson (tjh@cryptsoft.com). | |
53 | * | |
54 | */ | |
4d94ae00 | 55 | |
5454829a | 56 | #include <string.h> |
6a50d0a4 | 57 | #include "ecs_locl.h" |
58ae65cd | 58 | #ifndef OPENSSL_NO_ENGINE |
0f113f3e | 59 | # include <openssl/engine.h> |
58ae65cd | 60 | #endif |
60a938c6 | 61 | #include <openssl/err.h> |
0f814687 | 62 | #include <openssl/bn.h> |
4d94ae00 | 63 | |
0f113f3e | 64 | const char ECDSA_version[] = "ECDSA" OPENSSL_VERSION_PTEXT; |
4d94ae00 BM |
65 | |
66 | static const ECDSA_METHOD *default_ECDSA_method = NULL; | |
67 | ||
bbbd6710 | 68 | static void *ecdsa_data_new(void); |
9dd84053 | 69 | static void *ecdsa_data_dup(void *); |
0f113f3e | 70 | static void ecdsa_data_free(void *); |
9dd84053 | 71 | |
4d94ae00 BM |
72 | void ECDSA_set_default_method(const ECDSA_METHOD *meth) |
73 | { | |
0f113f3e | 74 | default_ECDSA_method = meth; |
4d94ae00 BM |
75 | } |
76 | ||
77 | const ECDSA_METHOD *ECDSA_get_default_method(void) | |
78 | { | |
0f113f3e MC |
79 | if (!default_ECDSA_method) |
80 | default_ECDSA_method = ECDSA_OpenSSL(); | |
81 | return default_ECDSA_method; | |
4d94ae00 BM |
82 | } |
83 | ||
14a7cfb3 | 84 | int ECDSA_set_method(EC_KEY *eckey, const ECDSA_METHOD *meth) |
4d94ae00 | 85 | { |
0f113f3e | 86 | ECDSA_DATA *ecdsa; |
14a7cfb3 | 87 | |
0f113f3e | 88 | ecdsa = ecdsa_check(eckey); |
14a7cfb3 | 89 | |
0f113f3e MC |
90 | if (ecdsa == NULL) |
91 | return 0; | |
14a7cfb3 | 92 | |
58ae65cd | 93 | #ifndef OPENSSL_NO_ENGINE |
0f113f3e MC |
94 | if (ecdsa->engine) { |
95 | ENGINE_finish(ecdsa->engine); | |
96 | ecdsa->engine = NULL; | |
97 | } | |
58ae65cd | 98 | #endif |
0f113f3e | 99 | ecdsa->meth = meth; |
4d94ae00 | 100 | |
0f113f3e | 101 | return 1; |
14a7cfb3 BM |
102 | } |
103 | ||
9dd84053 | 104 | static ECDSA_DATA *ECDSA_DATA_new_method(ENGINE *engine) |
4d94ae00 | 105 | { |
0f113f3e | 106 | ECDSA_DATA *ret; |
4d94ae00 | 107 | |
b4faea50 | 108 | ret = OPENSSL_malloc(sizeof(*ret)); |
0f113f3e MC |
109 | if (ret == NULL) { |
110 | ECDSAerr(ECDSA_F_ECDSA_DATA_NEW_METHOD, ERR_R_MALLOC_FAILURE); | |
111 | return (NULL); | |
112 | } | |
4d94ae00 | 113 | |
0f113f3e | 114 | ret->init = NULL; |
14a7cfb3 | 115 | |
0f113f3e MC |
116 | ret->meth = ECDSA_get_default_method(); |
117 | ret->engine = engine; | |
58ae65cd | 118 | #ifndef OPENSSL_NO_ENGINE |
0f113f3e MC |
119 | if (!ret->engine) |
120 | ret->engine = ENGINE_get_default_ECDSA(); | |
121 | if (ret->engine) { | |
122 | ret->meth = ENGINE_get_ECDSA(ret->engine); | |
123 | if (!ret->meth) { | |
124 | ECDSAerr(ECDSA_F_ECDSA_DATA_NEW_METHOD, ERR_R_ENGINE_LIB); | |
125 | ENGINE_finish(ret->engine); | |
126 | OPENSSL_free(ret); | |
127 | return NULL; | |
128 | } | |
129 | } | |
58ae65cd | 130 | #endif |
4d94ae00 | 131 | |
0f113f3e MC |
132 | ret->flags = ret->meth->flags; |
133 | CRYPTO_new_ex_data(CRYPTO_EX_INDEX_ECDSA, ret, &ret->ex_data); | |
0f113f3e | 134 | return (ret); |
4d94ae00 BM |
135 | } |
136 | ||
bbbd6710 | 137 | static void *ecdsa_data_new(void) |
4d94ae00 | 138 | { |
0f113f3e | 139 | return (void *)ECDSA_DATA_new_method(NULL); |
9dd84053 NL |
140 | } |
141 | ||
142 | static void *ecdsa_data_dup(void *data) | |
143 | { | |
0f113f3e | 144 | ECDSA_DATA *r = (ECDSA_DATA *)data; |
9dd84053 | 145 | |
0f113f3e MC |
146 | /* XXX: dummy operation */ |
147 | if (r == NULL) | |
148 | return NULL; | |
9dd84053 | 149 | |
0f113f3e | 150 | return ecdsa_data_new(); |
9dd84053 NL |
151 | } |
152 | ||
153 | static void ecdsa_data_free(void *data) | |
154 | { | |
0f113f3e | 155 | ECDSA_DATA *r = (ECDSA_DATA *)data; |
4d94ae00 | 156 | |
58ae65cd | 157 | #ifndef OPENSSL_NO_ENGINE |
0f113f3e MC |
158 | if (r->engine) |
159 | ENGINE_finish(r->engine); | |
58ae65cd | 160 | #endif |
0f113f3e | 161 | CRYPTO_free_ex_data(CRYPTO_EX_INDEX_ECDSA, r, &r->ex_data); |
4d94ae00 | 162 | |
4b45c6e5 | 163 | OPENSSL_clear_free((void *)r, sizeof(ECDSA_DATA)); |
4d94ae00 BM |
164 | } |
165 | ||
14a7cfb3 BM |
166 | ECDSA_DATA *ecdsa_check(EC_KEY *key) |
167 | { | |
0f113f3e MC |
168 | ECDSA_DATA *ecdsa_data; |
169 | ||
170 | void *data = EC_KEY_get_key_method_data(key, ecdsa_data_dup, | |
171 | ecdsa_data_free, ecdsa_data_free); | |
172 | if (data == NULL) { | |
173 | ecdsa_data = (ECDSA_DATA *)ecdsa_data_new(); | |
174 | if (ecdsa_data == NULL) | |
175 | return NULL; | |
176 | data = EC_KEY_insert_key_method_data(key, (void *)ecdsa_data, | |
177 | ecdsa_data_dup, ecdsa_data_free, | |
178 | ecdsa_data_free); | |
179 | if (data != NULL) { | |
180 | /* | |
181 | * Another thread raced us to install the key_method data and | |
182 | * won. | |
183 | */ | |
184 | ecdsa_data_free(ecdsa_data); | |
185 | ecdsa_data = (ECDSA_DATA *)data; | |
186 | } | |
187 | } else | |
188 | ecdsa_data = (ECDSA_DATA *)data; | |
189 | ||
190 | return ecdsa_data; | |
14a7cfb3 BM |
191 | } |
192 | ||
193 | int ECDSA_size(const EC_KEY *r) | |
4d94ae00 | 194 | { |
0f113f3e MC |
195 | int ret, i; |
196 | ASN1_INTEGER bs; | |
197 | BIGNUM *order = NULL; | |
198 | unsigned char buf[4]; | |
199 | const EC_GROUP *group; | |
200 | ||
201 | if (r == NULL) | |
202 | return 0; | |
203 | group = EC_KEY_get0_group(r); | |
204 | if (group == NULL) | |
205 | return 0; | |
206 | ||
207 | if ((order = BN_new()) == NULL) | |
208 | return 0; | |
209 | if (!EC_GROUP_get_order(group, order, NULL)) { | |
210 | BN_clear_free(order); | |
211 | return 0; | |
212 | } | |
213 | i = BN_num_bits(order); | |
214 | bs.length = (i + 7) / 8; | |
215 | bs.data = buf; | |
216 | bs.type = V_ASN1_INTEGER; | |
217 | /* If the top bit is set the asn1 encoding is 1 larger. */ | |
218 | buf[0] = 0xff; | |
219 | ||
220 | i = i2d_ASN1_INTEGER(&bs, NULL); | |
221 | i += i; /* r and s */ | |
222 | ret = ASN1_object_size(1, i, V_ASN1_SEQUENCE); | |
223 | BN_clear_free(order); | |
224 | return (ret); | |
4d94ae00 BM |
225 | } |
226 | ||
227 | int ECDSA_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func, | |
0f113f3e | 228 | CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func) |
4d94ae00 | 229 | { |
0f113f3e MC |
230 | return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_ECDSA, argl, argp, |
231 | new_func, dup_func, free_func); | |
4d94ae00 BM |
232 | } |
233 | ||
14a7cfb3 | 234 | int ECDSA_set_ex_data(EC_KEY *d, int idx, void *arg) |
4d94ae00 | 235 | { |
0f113f3e MC |
236 | ECDSA_DATA *ecdsa; |
237 | ecdsa = ecdsa_check(d); | |
238 | if (ecdsa == NULL) | |
239 | return 0; | |
240 | return (CRYPTO_set_ex_data(&ecdsa->ex_data, idx, arg)); | |
0bee0e62 BM |
241 | } |
242 | ||
14a7cfb3 | 243 | void *ECDSA_get_ex_data(EC_KEY *d, int idx) |
0bee0e62 | 244 | { |
0f113f3e MC |
245 | ECDSA_DATA *ecdsa; |
246 | ecdsa = ecdsa_check(d); | |
247 | if (ecdsa == NULL) | |
248 | return NULL; | |
249 | return (CRYPTO_get_ex_data(&ecdsa->ex_data, idx)); | |
0bee0e62 | 250 | } |
94c2f77a DSH |
251 | |
252 | ECDSA_METHOD *ECDSA_METHOD_new(ECDSA_METHOD *ecdsa_meth) | |
0f113f3e MC |
253 | { |
254 | ECDSA_METHOD *ret; | |
255 | ||
b4faea50 | 256 | ret = OPENSSL_malloc(sizeof(*ret)); |
0f113f3e MC |
257 | if (ret == NULL) { |
258 | ECDSAerr(ECDSA_F_ECDSA_METHOD_NEW, ERR_R_MALLOC_FAILURE); | |
259 | return NULL; | |
260 | } | |
261 | ||
262 | if (ecdsa_meth) | |
263 | *ret = *ecdsa_meth; | |
264 | else { | |
265 | ret->ecdsa_sign_setup = 0; | |
266 | ret->ecdsa_do_sign = 0; | |
267 | ret->ecdsa_do_verify = 0; | |
268 | ret->name = NULL; | |
269 | ret->flags = 0; | |
270 | } | |
271 | ret->flags |= ECDSA_METHOD_FLAG_ALLOCATED; | |
272 | return ret; | |
273 | } | |
94c2f77a DSH |
274 | |
275 | void ECDSA_METHOD_set_sign(ECDSA_METHOD *ecdsa_method, | |
0f113f3e MC |
276 | ECDSA_SIG *(*ecdsa_do_sign) (const unsigned char |
277 | *dgst, int dgst_len, | |
278 | const BIGNUM *inv, | |
279 | const BIGNUM *rp, | |
280 | EC_KEY *eckey)) | |
281 | { | |
282 | ecdsa_method->ecdsa_do_sign = ecdsa_do_sign; | |
283 | } | |
94c2f77a DSH |
284 | |
285 | void ECDSA_METHOD_set_sign_setup(ECDSA_METHOD *ecdsa_method, | |
0f113f3e MC |
286 | int (*ecdsa_sign_setup) (EC_KEY *eckey, |
287 | BN_CTX *ctx, | |
288 | BIGNUM **kinv, | |
289 | BIGNUM **r)) | |
290 | { | |
291 | ecdsa_method->ecdsa_sign_setup = ecdsa_sign_setup; | |
292 | } | |
94c2f77a DSH |
293 | |
294 | void ECDSA_METHOD_set_verify(ECDSA_METHOD *ecdsa_method, | |
0f113f3e MC |
295 | int (*ecdsa_do_verify) (const unsigned char |
296 | *dgst, int dgst_len, | |
297 | const ECDSA_SIG *sig, | |
298 | EC_KEY *eckey)) | |
299 | { | |
300 | ecdsa_method->ecdsa_do_verify = ecdsa_do_verify; | |
301 | } | |
94c2f77a DSH |
302 | |
303 | void ECDSA_METHOD_set_flags(ECDSA_METHOD *ecdsa_method, int flags) | |
0f113f3e MC |
304 | { |
305 | ecdsa_method->flags = flags | ECDSA_METHOD_FLAG_ALLOCATED; | |
306 | } | |
94c2f77a DSH |
307 | |
308 | void ECDSA_METHOD_set_name(ECDSA_METHOD *ecdsa_method, char *name) | |
0f113f3e MC |
309 | { |
310 | ecdsa_method->name = name; | |
311 | } | |
94c2f77a DSH |
312 | |
313 | void ECDSA_METHOD_free(ECDSA_METHOD *ecdsa_method) | |
0f113f3e | 314 | { |
895cba19 RS |
315 | if (!ecdsa_method) |
316 | return; | |
0f113f3e MC |
317 | if (ecdsa_method->flags & ECDSA_METHOD_FLAG_ALLOCATED) |
318 | OPENSSL_free(ecdsa_method); | |
319 | } | |
94c2f77a | 320 | |
387b844f | 321 | void ECDSA_METHOD_set_app_data(ECDSA_METHOD *ecdsa_method, void *app) |
0f113f3e MC |
322 | { |
323 | ecdsa_method->app_data = app; | |
324 | } | |
325 | ||
326 | void *ECDSA_METHOD_get_app_data(ECDSA_METHOD *ecdsa_method) | |
327 | { | |
328 | return ecdsa_method->app_data; | |
329 | } |