1 /* Written by Dr Stephen N Henson (steve@openssl.org) 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
pkey_ec_init(EVP_PKEY_CTX * ctx)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
pkey_ec_copy(EVP_PKEY_CTX * dst,EVP_PKEY_CTX * src)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
pkey_ec_cleanup(EVP_PKEY_CTX * ctx)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
pkey_ec_sign(EVP_PKEY_CTX * ctx,unsigned char * sig,size_t * siglen,const unsigned char * tbs,size_t tbslen)119 static int pkey_ec_sign(EVP_PKEY_CTX *ctx, unsigned char *sig, size_t *siglen,
120 const unsigned char *tbs, size_t tbslen)
121 {
122 int ret, type;
123 unsigned int sltmp;
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 }
132 else if(*siglen < (size_t)ECDSA_size(ec))
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;
148 *siglen = (size_t)sltmp;
149 return 1;
150 }
151
pkey_ec_verify(EVP_PKEY_CTX * ctx,const unsigned char * sig,size_t siglen,const unsigned char * tbs,size_t tbslen)152 static int pkey_ec_verify(EVP_PKEY_CTX *ctx,
153 const unsigned char *sig, size_t siglen,
154 const unsigned char *tbs, size_t tbslen)
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
pkey_ec_derive(EVP_PKEY_CTX * ctx,unsigned char * key,size_t * keylen)170 static int pkey_ec_derive(EVP_PKEY_CTX *ctx, unsigned char *key, size_t *keylen)
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
pkey_ec_ctrl(EVP_PKEY_CTX * ctx,int type,int p1,void * p2)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:
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)
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 */
237 case EVP_PKEY_CTRL_DIGESTINIT:
238 case EVP_PKEY_CTRL_PKCS7_SIGN:
239 case EVP_PKEY_CTRL_CMS_SIGN:
240 return 1;
241
242 default:
243 return -2;
244
245 }
246 }
247
pkey_ec_ctrl_str(EVP_PKEY_CTX * ctx,const char * type,const char * value)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
pkey_ec_paramgen(EVP_PKEY_CTX * ctx,EVP_PKEY * pkey)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
pkey_ec_keygen(EVP_PKEY_CTX * ctx,EVP_PKEY * pkey)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,
311 pkey_ec_copy,
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 };
341