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9ca7047d DSH |
1 | /* Written by Dr Stephen N Henson (shenson@bigfoot.com) for the OpenSSL |
2 | * project 2006. | |
3 | */ | |
4 | /* ==================================================================== | |
5 | * Copyright (c) 2006 The OpenSSL Project. All rights reserved. | |
6 | * | |
7 | * Redistribution and use in source and binary forms, with or without | |
8 | * modification, are permitted provided that the following conditions | |
9 | * are met: | |
10 | * | |
11 | * 1. Redistributions of source code must retain the above copyright | |
12 | * notice, this list of conditions and the following disclaimer. | |
13 | * | |
14 | * 2. Redistributions in binary form must reproduce the above copyright | |
15 | * notice, this list of conditions and the following disclaimer in | |
16 | * the documentation and/or other materials provided with the | |
17 | * distribution. | |
18 | * | |
19 | * 3. All advertising materials mentioning features or use of this | |
20 | * software must display the following acknowledgment: | |
21 | * "This product includes software developed by the OpenSSL Project | |
22 | * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" | |
23 | * | |
24 | * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to | |
25 | * endorse or promote products derived from this software without | |
26 | * prior written permission. For written permission, please contact | |
27 | * licensing@OpenSSL.org. | |
28 | * | |
29 | * 5. Products derived from this software may not be called "OpenSSL" | |
30 | * nor may "OpenSSL" appear in their names without prior written | |
31 | * permission of the OpenSSL Project. | |
32 | * | |
33 | * 6. Redistributions of any form whatsoever must retain the following | |
34 | * acknowledgment: | |
35 | * "This product includes software developed by the OpenSSL Project | |
36 | * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" | |
37 | * | |
38 | * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY | |
39 | * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
40 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR | |
41 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR | |
42 | * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
43 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
44 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; | |
45 | * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
46 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, | |
47 | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | |
48 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED | |
49 | * OF THE POSSIBILITY OF SUCH DAMAGE. | |
50 | * ==================================================================== | |
51 | * | |
52 | * This product includes cryptographic software written by Eric Young | |
53 | * (eay@cryptsoft.com). This product includes software written by Tim | |
54 | * Hudson (tjh@cryptsoft.com). | |
55 | * | |
56 | */ | |
57 | ||
58 | #include <stdio.h> | |
59 | #include "cryptlib.h" | |
60 | #include <openssl/asn1t.h> | |
61 | #include <openssl/x509.h> | |
62 | #include <openssl/ec.h> | |
63 | #include <openssl/ecdsa.h> | |
64 | #include <openssl/evp.h> | |
65 | #include "evp_locl.h" | |
66 | ||
67 | /* EC pkey context structure */ | |
68 | ||
69 | typedef struct | |
70 | { | |
71 | /* Key and paramgen group */ | |
72 | EC_GROUP *gen_group; | |
73 | /* message digest */ | |
74 | const EVP_MD *md; | |
75 | } EC_PKEY_CTX; | |
76 | ||
77 | static int pkey_ec_init(EVP_PKEY_CTX *ctx) | |
78 | { | |
79 | EC_PKEY_CTX *dctx; | |
80 | dctx = OPENSSL_malloc(sizeof(EC_PKEY_CTX)); | |
81 | if (!dctx) | |
82 | return 0; | |
83 | dctx->gen_group = NULL; | |
84 | dctx->md = NULL; | |
85 | ||
86 | ctx->data = dctx; | |
87 | ||
88 | return 1; | |
89 | } | |
90 | ||
8bdcef40 DSH |
91 | static int pkey_ec_copy(EVP_PKEY_CTX *dst, EVP_PKEY_CTX *src) |
92 | { | |
93 | EC_PKEY_CTX *dctx, *sctx; | |
94 | if (!pkey_ec_init(dst)) | |
95 | return 0; | |
96 | sctx = src->data; | |
97 | dctx = dst->data; | |
98 | if (sctx->gen_group) | |
99 | { | |
100 | dctx->gen_group = EC_GROUP_dup(sctx->gen_group); | |
101 | if (!dctx->gen_group) | |
102 | return 0; | |
103 | } | |
104 | dctx->md = sctx->md; | |
105 | return 1; | |
106 | } | |
107 | ||
9ca7047d DSH |
108 | static void pkey_ec_cleanup(EVP_PKEY_CTX *ctx) |
109 | { | |
110 | EC_PKEY_CTX *dctx = ctx->data; | |
111 | if (dctx) | |
112 | { | |
113 | if (dctx->gen_group) | |
114 | EC_GROUP_free(dctx->gen_group); | |
115 | OPENSSL_free(dctx); | |
116 | } | |
117 | } | |
118 | ||
eaff5a14 DSH |
119 | static int pkey_ec_sign(EVP_PKEY_CTX *ctx, unsigned char *sig, size_t *siglen, |
120 | const unsigned char *tbs, size_t tbslen) | |
9ca7047d DSH |
121 | { |
122 | int ret, type; | |
786aa98d | 123 | unsigned int sltmp; |
9ca7047d DSH |
124 | EC_PKEY_CTX *dctx = ctx->data; |
125 | EC_KEY *ec = ctx->pkey->pkey.ec; | |
126 | ||
127 | if (!sig) | |
128 | { | |
129 | *siglen = ECDSA_size(ec); | |
130 | return 1; | |
131 | } | |
eaff5a14 | 132 | else if(*siglen < (size_t)ECDSA_size(ec)) |
9ca7047d DSH |
133 | { |
134 | ECerr(EC_F_PKEY_EC_SIGN, EC_R_BUFFER_TOO_SMALL); | |
135 | return 0; | |
136 | } | |
137 | ||
138 | if (dctx->md) | |
139 | type = EVP_MD_type(dctx->md); | |
140 | else | |
141 | type = NID_sha1; | |
142 | ||
143 | ||
144 | ret = ECDSA_sign(type, tbs, tbslen, sig, &sltmp, ec); | |
145 | ||
146 | if (ret < 0) | |
147 | return ret; | |
786aa98d | 148 | *siglen = (size_t)sltmp; |
9ca7047d DSH |
149 | return 1; |
150 | } | |
151 | ||
152 | static int pkey_ec_verify(EVP_PKEY_CTX *ctx, | |
eaff5a14 DSH |
153 | const unsigned char *sig, size_t siglen, |
154 | const unsigned char *tbs, size_t tbslen) | |
9ca7047d DSH |
155 | { |
156 | int ret, type; | |
157 | EC_PKEY_CTX *dctx = ctx->data; | |
158 | EC_KEY *ec = ctx->pkey->pkey.ec; | |
159 | ||
160 | if (dctx->md) | |
161 | type = EVP_MD_type(dctx->md); | |
162 | else | |
163 | type = NID_sha1; | |
164 | ||
165 | ret = ECDSA_verify(type, tbs, tbslen, sig, siglen, ec); | |
166 | ||
167 | return ret; | |
168 | } | |
169 | ||
eaff5a14 | 170 | static int pkey_ec_derive(EVP_PKEY_CTX *ctx, unsigned char *key, size_t *keylen) |
9ca7047d DSH |
171 | { |
172 | int ret; | |
173 | size_t outlen; | |
174 | const EC_POINT *pubkey = NULL; | |
175 | if (!ctx->pkey || !ctx->peerkey) | |
176 | { | |
177 | ECerr(EC_F_PKEY_EC_DERIVE, EC_R_KEYS_NOT_SET); | |
178 | return 0; | |
179 | } | |
180 | ||
181 | if (!key) | |
182 | { | |
183 | const EC_GROUP *group; | |
184 | group = EC_KEY_get0_group(ctx->pkey->pkey.ec); | |
185 | *keylen = (EC_GROUP_get_degree(group) + 7)/8; | |
186 | return 1; | |
187 | } | |
188 | ||
189 | pubkey = EC_KEY_get0_public_key(ctx->peerkey->pkey.ec); | |
190 | ||
191 | /* NB: unlike PKS#3 DH, if *outlen is less than maximum size this is | |
192 | * not an error, the result is truncated. | |
193 | */ | |
194 | ||
195 | outlen = *keylen; | |
196 | ||
197 | ret = ECDH_compute_key(key, outlen, pubkey, ctx->pkey->pkey.ec, 0); | |
198 | if (ret < 0) | |
199 | return ret; | |
200 | *keylen = ret; | |
201 | return 1; | |
202 | } | |
203 | ||
204 | static int pkey_ec_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2) | |
205 | { | |
206 | EC_PKEY_CTX *dctx = ctx->data; | |
207 | EC_GROUP *group; | |
208 | switch (type) | |
209 | { | |
210 | case EVP_PKEY_CTRL_EC_PARAMGEN_CURVE_NID: | |
211 | group = EC_GROUP_new_by_curve_name(p1); | |
212 | if (group == NULL) | |
213 | { | |
214 | ECerr(EC_F_PKEY_EC_CTRL, EC_R_INVALID_CURVE); | |
215 | return 0; | |
216 | } | |
217 | if (dctx->gen_group) | |
218 | EC_GROUP_free(dctx->gen_group); | |
219 | dctx->gen_group = group; | |
220 | return 1; | |
221 | ||
222 | case EVP_PKEY_CTRL_MD: | |
06e2dd03 NL |
223 | if (EVP_MD_type((const EVP_MD *)p2) != NID_sha1 && |
224 | EVP_MD_type((const EVP_MD *)p2) != NID_sha224 && | |
225 | EVP_MD_type((const EVP_MD *)p2) != NID_sha256 && | |
226 | EVP_MD_type((const EVP_MD *)p2) != NID_sha384 && | |
227 | EVP_MD_type((const EVP_MD *)p2) != NID_sha512) | |
9ca7047d DSH |
228 | { |
229 | ECerr(EC_F_PKEY_EC_CTRL, EC_R_INVALID_DIGEST_TYPE); | |
230 | return 0; | |
231 | } | |
232 | dctx->md = p2; | |
233 | return 1; | |
234 | ||
235 | case EVP_PKEY_CTRL_PEER_KEY: | |
236 | /* Default behaviour is OK */ | |
156ee882 | 237 | case EVP_PKEY_CTRL_DIGESTINIT: |
b7683e3a | 238 | case EVP_PKEY_CTRL_PKCS7_SIGN: |
8931b30d | 239 | case EVP_PKEY_CTRL_CMS_SIGN: |
9ca7047d DSH |
240 | return 1; |
241 | ||
242 | default: | |
243 | return -2; | |
244 | ||
245 | } | |
246 | } | |
247 | ||
248 | static int pkey_ec_ctrl_str(EVP_PKEY_CTX *ctx, | |
249 | const char *type, const char *value) | |
250 | { | |
251 | if (!strcmp(type, "ec_paramgen_curve")) | |
252 | { | |
253 | int nid; | |
254 | nid = OBJ_sn2nid(value); | |
255 | if (nid == NID_undef) | |
256 | nid = OBJ_ln2nid(value); | |
257 | if (nid == NID_undef) | |
258 | { | |
259 | ECerr(EC_F_PKEY_EC_CTRL_STR, EC_R_INVALID_CURVE); | |
260 | return 0; | |
261 | } | |
262 | return EVP_PKEY_CTX_set_ec_paramgen_curve_nid(ctx, nid); | |
263 | } | |
264 | return -2; | |
265 | } | |
266 | ||
267 | static int pkey_ec_paramgen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey) | |
268 | { | |
269 | EC_KEY *ec = NULL; | |
270 | EC_PKEY_CTX *dctx = ctx->data; | |
271 | int ret = 0; | |
272 | if (dctx->gen_group == NULL) | |
273 | { | |
274 | ECerr(EC_F_PKEY_EC_PARAMGEN, EC_R_NO_PARAMETERS_SET); | |
275 | return 0; | |
276 | } | |
277 | ec = EC_KEY_new(); | |
278 | if (!ec) | |
279 | return 0; | |
280 | ret = EC_KEY_set_group(ec, dctx->gen_group); | |
281 | if (ret) | |
282 | EVP_PKEY_assign_EC_KEY(pkey, ec); | |
283 | else | |
284 | EC_KEY_free(ec); | |
285 | return ret; | |
286 | } | |
287 | ||
288 | static int pkey_ec_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey) | |
289 | { | |
290 | EC_KEY *ec = NULL; | |
291 | if (ctx->pkey == NULL) | |
292 | { | |
293 | ECerr(EC_F_PKEY_EC_KEYGEN, EC_R_NO_PARAMETERS_SET); | |
294 | return 0; | |
295 | } | |
296 | ec = EC_KEY_new(); | |
297 | if (!ec) | |
298 | return 0; | |
299 | EVP_PKEY_assign_EC_KEY(pkey, ec); | |
300 | /* Note: if error return, pkey is freed by parent routine */ | |
301 | if (!EVP_PKEY_copy_parameters(pkey, ctx->pkey)) | |
302 | return 0; | |
303 | return EC_KEY_generate_key(pkey->pkey.ec); | |
304 | } | |
305 | ||
306 | const EVP_PKEY_METHOD ec_pkey_meth = | |
307 | { | |
308 | EVP_PKEY_EC, | |
309 | 0, | |
310 | pkey_ec_init, | |
8bdcef40 | 311 | pkey_ec_copy, |
9ca7047d DSH |
312 | pkey_ec_cleanup, |
313 | ||
314 | 0, | |
315 | pkey_ec_paramgen, | |
316 | ||
317 | 0, | |
318 | pkey_ec_keygen, | |
319 | ||
320 | 0, | |
321 | pkey_ec_sign, | |
322 | ||
323 | 0, | |
324 | pkey_ec_verify, | |
325 | ||
326 | 0,0, | |
327 | ||
328 | 0,0,0,0, | |
329 | ||
330 | 0,0, | |
331 | ||
332 | 0,0, | |
333 | ||
334 | 0, | |
335 | pkey_ec_derive, | |
336 | ||
337 | pkey_ec_ctrl, | |
338 | pkey_ec_ctrl_str | |
339 | ||
340 | }; |