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 #include <openssl/evp.h>
57
58 #include <string.h>
59
60 #include <openssl/bn.h>
61 #include <openssl/digest.h>
62 #include <openssl/ec.h>
63 #include <openssl/ec_key.h>
64 #include <openssl/ecdh.h>
65 #include <openssl/ecdsa.h>
66 #include <openssl/err.h>
67 #include <openssl/mem.h>
68 #include <openssl/nid.h>
69
70 #include "internal.h"
71 #include "../fipsmodule/ec/internal.h"
72 #include "../internal.h"
73
74
75 typedef struct {
76 // message digest
77 const EVP_MD *md;
78 EC_GROUP *gen_group;
79 } EC_PKEY_CTX;
80
81
pkey_ec_init(EVP_PKEY_CTX * ctx)82 static int pkey_ec_init(EVP_PKEY_CTX *ctx) {
83 EC_PKEY_CTX *dctx;
84 dctx = OPENSSL_malloc(sizeof(EC_PKEY_CTX));
85 if (!dctx) {
86 return 0;
87 }
88 OPENSSL_memset(dctx, 0, sizeof(EC_PKEY_CTX));
89
90 ctx->data = dctx;
91
92 return 1;
93 }
94
pkey_ec_copy(EVP_PKEY_CTX * dst,EVP_PKEY_CTX * src)95 static int pkey_ec_copy(EVP_PKEY_CTX *dst, EVP_PKEY_CTX *src) {
96 EC_PKEY_CTX *dctx, *sctx;
97 if (!pkey_ec_init(dst)) {
98 return 0;
99 }
100 sctx = src->data;
101 dctx = dst->data;
102
103 dctx->md = sctx->md;
104
105 return 1;
106 }
107
pkey_ec_cleanup(EVP_PKEY_CTX * ctx)108 static void pkey_ec_cleanup(EVP_PKEY_CTX *ctx) {
109 EC_PKEY_CTX *dctx = ctx->data;
110 if (!dctx) {
111 return;
112 }
113
114 EC_GROUP_free(dctx->gen_group);
115 OPENSSL_free(dctx);
116 }
117
pkey_ec_sign(EVP_PKEY_CTX * ctx,uint8_t * sig,size_t * siglen,const uint8_t * tbs,size_t tbslen)118 static int pkey_ec_sign(EVP_PKEY_CTX *ctx, uint8_t *sig, size_t *siglen,
119 const uint8_t *tbs, size_t tbslen) {
120 unsigned int sltmp;
121 EC_KEY *ec = ctx->pkey->pkey.ec;
122
123 if (!sig) {
124 *siglen = ECDSA_size(ec);
125 return 1;
126 } else if (*siglen < (size_t)ECDSA_size(ec)) {
127 OPENSSL_PUT_ERROR(EVP, EVP_R_BUFFER_TOO_SMALL);
128 return 0;
129 }
130
131 if (!ECDSA_sign(0, tbs, tbslen, sig, &sltmp, ec)) {
132 return 0;
133 }
134 *siglen = (size_t)sltmp;
135 return 1;
136 }
137
pkey_ec_verify(EVP_PKEY_CTX * ctx,const uint8_t * sig,size_t siglen,const uint8_t * tbs,size_t tbslen)138 static int pkey_ec_verify(EVP_PKEY_CTX *ctx, const uint8_t *sig, size_t siglen,
139 const uint8_t *tbs, size_t tbslen) {
140 return ECDSA_verify(0, tbs, tbslen, sig, siglen, ctx->pkey->pkey.ec);
141 }
142
pkey_ec_derive(EVP_PKEY_CTX * ctx,uint8_t * key,size_t * keylen)143 static int pkey_ec_derive(EVP_PKEY_CTX *ctx, uint8_t *key,
144 size_t *keylen) {
145 int ret;
146 size_t outlen;
147 const EC_POINT *pubkey = NULL;
148 EC_KEY *eckey;
149
150 if (!ctx->pkey || !ctx->peerkey) {
151 OPENSSL_PUT_ERROR(EVP, EVP_R_KEYS_NOT_SET);
152 return 0;
153 }
154
155 eckey = ctx->pkey->pkey.ec;
156
157 if (!key) {
158 const EC_GROUP *group;
159 group = EC_KEY_get0_group(eckey);
160 *keylen = (EC_GROUP_get_degree(group) + 7) / 8;
161 return 1;
162 }
163 pubkey = EC_KEY_get0_public_key(ctx->peerkey->pkey.ec);
164
165 // NB: unlike PKCS#3 DH, if *outlen is less than maximum size this is
166 // not an error, the result is truncated.
167
168 outlen = *keylen;
169
170 ret = ECDH_compute_key(key, outlen, pubkey, eckey, 0);
171 if (ret < 0) {
172 return 0;
173 }
174 *keylen = ret;
175 return 1;
176 }
177
pkey_ec_ctrl(EVP_PKEY_CTX * ctx,int type,int p1,void * p2)178 static int pkey_ec_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2) {
179 EC_PKEY_CTX *dctx = ctx->data;
180
181 switch (type) {
182 case EVP_PKEY_CTRL_MD:
183 if (EVP_MD_type((const EVP_MD *)p2) != NID_sha1 &&
184 EVP_MD_type((const EVP_MD *)p2) != NID_ecdsa_with_SHA1 &&
185 EVP_MD_type((const EVP_MD *)p2) != NID_sha224 &&
186 EVP_MD_type((const EVP_MD *)p2) != NID_sha256 &&
187 EVP_MD_type((const EVP_MD *)p2) != NID_sha384 &&
188 EVP_MD_type((const EVP_MD *)p2) != NID_sha512) {
189 OPENSSL_PUT_ERROR(EVP, EVP_R_INVALID_DIGEST_TYPE);
190 return 0;
191 }
192 dctx->md = p2;
193 return 1;
194
195 case EVP_PKEY_CTRL_GET_MD:
196 *(const EVP_MD **)p2 = dctx->md;
197 return 1;
198
199 case EVP_PKEY_CTRL_PEER_KEY:
200 // Default behaviour is OK
201 return 1;
202
203 case EVP_PKEY_CTRL_EC_PARAMGEN_CURVE_NID: {
204 EC_GROUP *group = EC_GROUP_new_by_curve_name(p1);
205 if (group == NULL) {
206 return 0;
207 }
208 EC_GROUP_free(dctx->gen_group);
209 dctx->gen_group = group;
210 return 1;
211 }
212
213 default:
214 OPENSSL_PUT_ERROR(EVP, EVP_R_COMMAND_NOT_SUPPORTED);
215 return 0;
216 }
217 }
218
pkey_ec_keygen(EVP_PKEY_CTX * ctx,EVP_PKEY * pkey)219 static int pkey_ec_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey) {
220 EC_PKEY_CTX *dctx = ctx->data;
221 const EC_GROUP *group = dctx->gen_group;
222 if (group == NULL) {
223 if (ctx->pkey == NULL) {
224 OPENSSL_PUT_ERROR(EVP, EVP_R_NO_PARAMETERS_SET);
225 return 0;
226 }
227 group = EC_KEY_get0_group(ctx->pkey->pkey.ec);
228 }
229 EC_KEY *ec = EC_KEY_new();
230 if (ec == NULL ||
231 !EC_KEY_set_group(ec, group) ||
232 !EC_KEY_generate_key(ec)) {
233 EC_KEY_free(ec);
234 return 0;
235 }
236 EVP_PKEY_assign_EC_KEY(pkey, ec);
237 return 1;
238 }
239
pkey_ec_paramgen(EVP_PKEY_CTX * ctx,EVP_PKEY * pkey)240 static int pkey_ec_paramgen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey) {
241 EC_PKEY_CTX *dctx = ctx->data;
242 if (dctx->gen_group == NULL) {
243 OPENSSL_PUT_ERROR(EVP, EVP_R_NO_PARAMETERS_SET);
244 return 0;
245 }
246 EC_KEY *ec = EC_KEY_new();
247 if (ec == NULL ||
248 !EC_KEY_set_group(ec, dctx->gen_group)) {
249 EC_KEY_free(ec);
250 return 0;
251 }
252 EVP_PKEY_assign_EC_KEY(pkey, ec);
253 return 1;
254 }
255
256 const EVP_PKEY_METHOD ec_pkey_meth = {
257 EVP_PKEY_EC,
258 pkey_ec_init,
259 pkey_ec_copy,
260 pkey_ec_cleanup,
261 pkey_ec_keygen,
262 pkey_ec_sign,
263 NULL /* sign_message */,
264 pkey_ec_verify,
265 NULL /* verify_message */,
266 NULL /* verify_recover */,
267 NULL /* encrypt */,
268 NULL /* decrypt */,
269 pkey_ec_derive,
270 pkey_ec_paramgen,
271 pkey_ec_ctrl,
272 };
273
EVP_PKEY_CTX_set_ec_paramgen_curve_nid(EVP_PKEY_CTX * ctx,int nid)274 int EVP_PKEY_CTX_set_ec_paramgen_curve_nid(EVP_PKEY_CTX *ctx, int nid) {
275 return EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_EC, EVP_PKEY_OP_TYPE_GEN,
276 EVP_PKEY_CTRL_EC_PARAMGEN_CURVE_NID, nid, NULL);
277 }
278
EVP_PKEY_CTX_set_ec_param_enc(EVP_PKEY_CTX * ctx,int encoding)279 int EVP_PKEY_CTX_set_ec_param_enc(EVP_PKEY_CTX *ctx, int encoding) {
280 // BoringSSL only supports named curve syntax.
281 if (encoding != OPENSSL_EC_NAMED_CURVE) {
282 OPENSSL_PUT_ERROR(EVP, EVP_R_INVALID_PARAMETERS);
283 return 0;
284 }
285 return 1;
286 }
287