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/buf.h>
62 #include <openssl/digest.h>
63 #include <openssl/ec.h>
64 #include <openssl/ec_key.h>
65 #include <openssl/ecdh.h>
66 #include <openssl/ecdsa.h>
67 #include <openssl/err.h>
68 #include <openssl/mem.h>
69 #include <openssl/nid.h>
70
71 #include "internal.h"
72 #include "../fipsmodule/ec/internal.h"
73 #include "../internal.h"
74
75
76 typedef struct {
77 /* message digest */
78 const EVP_MD *md;
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 OPENSSL_free(dctx);
115 }
116
pkey_ec_sign(EVP_PKEY_CTX * ctx,uint8_t * sig,size_t * siglen,const uint8_t * tbs,size_t tbslen)117 static int pkey_ec_sign(EVP_PKEY_CTX *ctx, uint8_t *sig, size_t *siglen,
118 const uint8_t *tbs, size_t tbslen) {
119 unsigned int sltmp;
120 EC_KEY *ec = ctx->pkey->pkey.ec;
121
122 if (!sig) {
123 *siglen = ECDSA_size(ec);
124 return 1;
125 } else if (*siglen < (size_t)ECDSA_size(ec)) {
126 OPENSSL_PUT_ERROR(EVP, EVP_R_BUFFER_TOO_SMALL);
127 return 0;
128 }
129
130 if (!ECDSA_sign(0, tbs, tbslen, sig, &sltmp, ec)) {
131 return 0;
132 }
133 *siglen = (size_t)sltmp;
134 return 1;
135 }
136
pkey_ec_verify(EVP_PKEY_CTX * ctx,const uint8_t * sig,size_t siglen,const uint8_t * tbs,size_t tbslen)137 static int pkey_ec_verify(EVP_PKEY_CTX *ctx, const uint8_t *sig, size_t siglen,
138 const uint8_t *tbs, size_t tbslen) {
139 return ECDSA_verify(0, tbs, tbslen, sig, siglen, ctx->pkey->pkey.ec);
140 }
141
pkey_ec_derive(EVP_PKEY_CTX * ctx,uint8_t * key,size_t * keylen)142 static int pkey_ec_derive(EVP_PKEY_CTX *ctx, uint8_t *key,
143 size_t *keylen) {
144 int ret;
145 size_t outlen;
146 const EC_POINT *pubkey = NULL;
147 EC_KEY *eckey;
148
149 if (!ctx->pkey || !ctx->peerkey) {
150 OPENSSL_PUT_ERROR(EVP, EVP_R_KEYS_NOT_SET);
151 return 0;
152 }
153
154 eckey = ctx->pkey->pkey.ec;
155
156 if (!key) {
157 const EC_GROUP *group;
158 group = EC_KEY_get0_group(eckey);
159 *keylen = (EC_GROUP_get_degree(group) + 7) / 8;
160 return 1;
161 }
162 pubkey = EC_KEY_get0_public_key(ctx->peerkey->pkey.ec);
163
164 /* NB: unlike PKCS#3 DH, if *outlen is less than maximum size this is
165 * not an error, the result is truncated. */
166
167 outlen = *keylen;
168
169 ret = ECDH_compute_key(key, outlen, pubkey, eckey, 0);
170 if (ret < 0) {
171 return 0;
172 }
173 *keylen = ret;
174 return 1;
175 }
176
pkey_ec_ctrl(EVP_PKEY_CTX * ctx,int type,int p1,void * p2)177 static int pkey_ec_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2) {
178 EC_PKEY_CTX *dctx = ctx->data;
179
180 switch (type) {
181 case EVP_PKEY_CTRL_MD:
182 if (EVP_MD_type((const EVP_MD *)p2) != NID_sha1 &&
183 EVP_MD_type((const EVP_MD *)p2) != NID_ecdsa_with_SHA1 &&
184 EVP_MD_type((const EVP_MD *)p2) != NID_sha224 &&
185 EVP_MD_type((const EVP_MD *)p2) != NID_sha256 &&
186 EVP_MD_type((const EVP_MD *)p2) != NID_sha384 &&
187 EVP_MD_type((const EVP_MD *)p2) != NID_sha512) {
188 OPENSSL_PUT_ERROR(EVP, EVP_R_INVALID_DIGEST_TYPE);
189 return 0;
190 }
191 dctx->md = p2;
192 return 1;
193
194 case EVP_PKEY_CTRL_GET_MD:
195 *(const EVP_MD **)p2 = dctx->md;
196 return 1;
197
198 case EVP_PKEY_CTRL_PEER_KEY:
199 /* Default behaviour is OK */
200 return 1;
201
202 default:
203 OPENSSL_PUT_ERROR(EVP, EVP_R_COMMAND_NOT_SUPPORTED);
204 return 0;
205 }
206 }
207
pkey_ec_keygen(EVP_PKEY_CTX * ctx,EVP_PKEY * pkey)208 static int pkey_ec_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey) {
209 if (ctx->pkey == NULL) {
210 OPENSSL_PUT_ERROR(EVP, EVP_R_NO_PARAMETERS_SET);
211 return 0;
212 }
213 EC_KEY *ec = EC_KEY_new();
214 if (ec == NULL ||
215 !EC_KEY_set_group(ec, EC_KEY_get0_group(ctx->pkey->pkey.ec)) ||
216 !EC_KEY_generate_key(ec)) {
217 EC_KEY_free(ec);
218 return 0;
219 }
220 EVP_PKEY_assign_EC_KEY(pkey, ec);
221 return 1;
222 }
223
224 const EVP_PKEY_METHOD ec_pkey_meth = {
225 EVP_PKEY_EC,
226 pkey_ec_init,
227 pkey_ec_copy,
228 pkey_ec_cleanup,
229 pkey_ec_keygen,
230 pkey_ec_sign,
231 NULL /* sign_message */,
232 pkey_ec_verify,
233 NULL /* verify_message */,
234 NULL /* verify_recover */,
235 NULL /* encrypt */,
236 NULL /* decrypt */,
237 pkey_ec_derive,
238 pkey_ec_ctrl,
239 };
240