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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 | |
10 | * notice, this list of conditions and the following disclaimer. | |
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 |
4d94ae00 | 59 | #include <openssl/engine.h> |
58ae65cd | 60 | #endif |
60a938c6 | 61 | #include <openssl/err.h> |
0f814687 | 62 | #include <openssl/bn.h> |
6342b6e3 DSH |
63 | #ifdef OPENSSL_FIPS |
64 | #include <openssl/fips.h> | |
65 | #endif | |
4d94ae00 | 66 | |
560b79cb | 67 | const char ECDSA_version[]="ECDSA" OPENSSL_VERSION_PTEXT; |
4d94ae00 BM |
68 | |
69 | static const ECDSA_METHOD *default_ECDSA_method = NULL; | |
70 | ||
bbbd6710 | 71 | static void *ecdsa_data_new(void); |
9dd84053 NL |
72 | static void *ecdsa_data_dup(void *); |
73 | static void ecdsa_data_free(void *); | |
74 | ||
4d94ae00 BM |
75 | void ECDSA_set_default_method(const ECDSA_METHOD *meth) |
76 | { | |
77 | default_ECDSA_method = meth; | |
78 | } | |
79 | ||
80 | const ECDSA_METHOD *ECDSA_get_default_method(void) | |
81 | { | |
82 | if(!default_ECDSA_method) | |
6342b6e3 DSH |
83 | { |
84 | #ifdef OPENSSL_FIPS | |
85 | if (FIPS_mode()) | |
3a5b97b7 | 86 | return FIPS_ecdsa_openssl(); |
6342b6e3 | 87 | else |
3a5b97b7 DSH |
88 | return ECDSA_OpenSSL(); |
89 | #else | |
90 | default_ECDSA_method = ECDSA_OpenSSL(); | |
6342b6e3 | 91 | #endif |
6342b6e3 | 92 | } |
4d94ae00 BM |
93 | return default_ECDSA_method; |
94 | } | |
95 | ||
14a7cfb3 | 96 | int ECDSA_set_method(EC_KEY *eckey, const ECDSA_METHOD *meth) |
4d94ae00 | 97 | { |
14a7cfb3 BM |
98 | ECDSA_DATA *ecdsa; |
99 | ||
100 | ecdsa = ecdsa_check(eckey); | |
101 | ||
102 | if (ecdsa == NULL) | |
103 | return 0; | |
104 | ||
58ae65cd | 105 | #ifndef OPENSSL_NO_ENGINE |
4d94ae00 BM |
106 | if (ecdsa->engine) |
107 | { | |
108 | ENGINE_finish(ecdsa->engine); | |
109 | ecdsa->engine = NULL; | |
110 | } | |
58ae65cd | 111 | #endif |
4d94ae00 | 112 | ecdsa->meth = meth; |
4d94ae00 | 113 | |
9dd84053 | 114 | return 1; |
14a7cfb3 BM |
115 | } |
116 | ||
9dd84053 | 117 | static ECDSA_DATA *ECDSA_DATA_new_method(ENGINE *engine) |
4d94ae00 | 118 | { |
14a7cfb3 | 119 | ECDSA_DATA *ret; |
4d94ae00 | 120 | |
14a7cfb3 | 121 | ret=(ECDSA_DATA *)OPENSSL_malloc(sizeof(ECDSA_DATA)); |
4d94ae00 BM |
122 | if (ret == NULL) |
123 | { | |
aa4ce731 | 124 | ECDSAerr(ECDSA_F_ECDSA_DATA_NEW_METHOD, ERR_R_MALLOC_FAILURE); |
4d94ae00 BM |
125 | return(NULL); |
126 | } | |
127 | ||
14a7cfb3 | 128 | ret->init = NULL; |
14a7cfb3 | 129 | |
4d94ae00 BM |
130 | ret->meth = ECDSA_get_default_method(); |
131 | ret->engine = engine; | |
58ae65cd | 132 | #ifndef OPENSSL_NO_ENGINE |
4d94ae00 BM |
133 | if (!ret->engine) |
134 | ret->engine = ENGINE_get_default_ECDSA(); | |
135 | if (ret->engine) | |
136 | { | |
137 | ret->meth = ENGINE_get_ECDSA(ret->engine); | |
138 | if (!ret->meth) | |
139 | { | |
aa4ce731 | 140 | ECDSAerr(ECDSA_F_ECDSA_DATA_NEW_METHOD, ERR_R_ENGINE_LIB); |
4d94ae00 BM |
141 | ENGINE_finish(ret->engine); |
142 | OPENSSL_free(ret); | |
143 | return NULL; | |
144 | } | |
145 | } | |
58ae65cd | 146 | #endif |
4d94ae00 | 147 | |
4d94ae00 BM |
148 | ret->flags = ret->meth->flags; |
149 | CRYPTO_new_ex_data(CRYPTO_EX_INDEX_ECDSA, ret, &ret->ex_data); | |
14a7cfb3 | 150 | #if 0 |
4d94ae00 BM |
151 | if ((ret->meth->init != NULL) && !ret->meth->init(ret)) |
152 | { | |
153 | CRYPTO_free_ex_data(CRYPTO_EX_INDEX_ECDSA, ret, &ret->ex_data); | |
154 | OPENSSL_free(ret); | |
155 | ret=NULL; | |
156 | } | |
14a7cfb3 | 157 | #endif |
4d94ae00 BM |
158 | return(ret); |
159 | } | |
160 | ||
bbbd6710 | 161 | static void *ecdsa_data_new(void) |
4d94ae00 | 162 | { |
9dd84053 NL |
163 | return (void *)ECDSA_DATA_new_method(NULL); |
164 | } | |
165 | ||
166 | static void *ecdsa_data_dup(void *data) | |
167 | { | |
168 | ECDSA_DATA *r = (ECDSA_DATA *)data; | |
169 | ||
170 | /* XXX: dummy operation */ | |
171 | if (r == NULL) | |
172 | return NULL; | |
173 | ||
174 | return ecdsa_data_new(); | |
175 | } | |
176 | ||
177 | static void ecdsa_data_free(void *data) | |
178 | { | |
179 | ECDSA_DATA *r = (ECDSA_DATA *)data; | |
4d94ae00 | 180 | |
58ae65cd | 181 | #ifndef OPENSSL_NO_ENGINE |
4d94ae00 BM |
182 | if (r->engine) |
183 | ENGINE_finish(r->engine); | |
58ae65cd | 184 | #endif |
4d94ae00 BM |
185 | CRYPTO_free_ex_data(CRYPTO_EX_INDEX_ECDSA, r, &r->ex_data); |
186 | ||
4579924b | 187 | OPENSSL_cleanse((void *)r, sizeof(ECDSA_DATA)); |
14a7cfb3 | 188 | |
4d94ae00 BM |
189 | OPENSSL_free(r); |
190 | } | |
191 | ||
14a7cfb3 BM |
192 | ECDSA_DATA *ecdsa_check(EC_KEY *key) |
193 | { | |
9dd84053 NL |
194 | ECDSA_DATA *ecdsa_data; |
195 | ||
196 | void *data = EC_KEY_get_key_method_data(key, ecdsa_data_dup, | |
197 | ecdsa_data_free, ecdsa_data_free); | |
198 | if (data == NULL) | |
14a7cfb3 | 199 | { |
9dd84053 NL |
200 | ecdsa_data = (ECDSA_DATA *)ecdsa_data_new(); |
201 | if (ecdsa_data == NULL) | |
202 | return NULL; | |
203 | EC_KEY_insert_key_method_data(key, (void *)ecdsa_data, | |
204 | ecdsa_data_dup, ecdsa_data_free, ecdsa_data_free); | |
14a7cfb3 BM |
205 | } |
206 | else | |
9dd84053 | 207 | ecdsa_data = (ECDSA_DATA *)data; |
b6d63b25 DSH |
208 | #ifdef OPENSSL_FIPS |
209 | if (FIPS_mode() && !(ecdsa_data->flags & ECDSA_FLAG_FIPS_METHOD) | |
210 | && !(EC_KEY_get_flags(key) & EC_FLAG_NON_FIPS_ALLOW)) | |
211 | { | |
212 | ECDSAerr(ECDSA_F_ECDSA_CHECK, ECDSA_R_NON_FIPS_METHOD); | |
213 | return NULL; | |
214 | } | |
215 | #endif | |
14a7cfb3 | 216 | |
9dd84053 | 217 | return ecdsa_data; |
14a7cfb3 BM |
218 | } |
219 | ||
220 | int ECDSA_size(const EC_KEY *r) | |
4d94ae00 BM |
221 | { |
222 | int ret,i; | |
223 | ASN1_INTEGER bs; | |
224 | BIGNUM *order=NULL; | |
225 | unsigned char buf[4]; | |
8c5a2bd6 | 226 | const EC_GROUP *group; |
4d94ae00 | 227 | |
8c5a2bd6 NL |
228 | if (r == NULL) |
229 | return 0; | |
230 | group = EC_KEY_get0_group(r); | |
231 | if (group == NULL) | |
4d94ae00 | 232 | return 0; |
8c5a2bd6 | 233 | |
4d94ae00 | 234 | if ((order = BN_new()) == NULL) return 0; |
9dd84053 | 235 | if (!EC_GROUP_get_order(group,order,NULL)) |
4d94ae00 BM |
236 | { |
237 | BN_clear_free(order); | |
238 | return 0; | |
239 | } | |
240 | i=BN_num_bits(order); | |
241 | bs.length=(i+7)/8; | |
242 | bs.data=buf; | |
243 | bs.type=V_ASN1_INTEGER; | |
244 | /* If the top bit is set the asn1 encoding is 1 larger. */ | |
245 | buf[0]=0xff; | |
246 | ||
247 | i=i2d_ASN1_INTEGER(&bs,NULL); | |
248 | i+=i; /* r and s */ | |
249 | ret=ASN1_object_size(1,i,V_ASN1_SEQUENCE); | |
250 | BN_clear_free(order); | |
251 | return(ret); | |
252 | } | |
253 | ||
14a7cfb3 | 254 | |
4d94ae00 BM |
255 | int ECDSA_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func, |
256 | CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func) | |
257 | { | |
258 | return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_ECDSA, argl, argp, | |
259 | new_func, dup_func, free_func); | |
260 | } | |
261 | ||
14a7cfb3 | 262 | int ECDSA_set_ex_data(EC_KEY *d, int idx, void *arg) |
4d94ae00 | 263 | { |
14a7cfb3 BM |
264 | ECDSA_DATA *ecdsa; |
265 | ecdsa = ecdsa_check(d); | |
266 | if (ecdsa == NULL) | |
267 | return 0; | |
268 | return(CRYPTO_set_ex_data(&ecdsa->ex_data,idx,arg)); | |
0bee0e62 BM |
269 | } |
270 | ||
14a7cfb3 | 271 | void *ECDSA_get_ex_data(EC_KEY *d, int idx) |
0bee0e62 | 272 | { |
14a7cfb3 BM |
273 | ECDSA_DATA *ecdsa; |
274 | ecdsa = ecdsa_check(d); | |
275 | if (ecdsa == NULL) | |
276 | return NULL; | |
277 | return(CRYPTO_get_ex_data(&ecdsa->ex_data,idx)); | |
0bee0e62 | 278 | } |