1 /* $OpenBSD: ec_pmeth.c,v 1.8 2014/07/12 16:03:37 miod Exp $ */
2 /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
5 /* ====================================================================
6 * Copyright (c) 2006 The OpenSSL Project. All rights reserved.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in
17 * the documentation and/or other materials provided with the
20 * 3. All advertising materials mentioning features or use of this
21 * software must display the following acknowledgment:
22 * "This product includes software developed by the OpenSSL Project
23 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
25 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
26 * endorse or promote products derived from this software without
27 * prior written permission. For written permission, please contact
28 * licensing@OpenSSL.org.
30 * 5. Products derived from this software may not be called "OpenSSL"
31 * nor may "OpenSSL" appear in their names without prior written
32 * permission of the OpenSSL Project.
34 * 6. Redistributions of any form whatsoever must retain the following
36 * "This product includes software developed by the OpenSSL Project
37 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
39 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
40 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
41 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
42 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
43 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
44 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
45 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
46 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
48 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
49 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
50 * OF THE POSSIBILITY OF SUCH DAMAGE.
51 * ====================================================================
53 * This product includes cryptographic software written by Eric Young
54 * (eay@cryptsoft.com). This product includes software written by Tim
55 * Hudson (tjh@cryptsoft.com).
62 #include <openssl/asn1t.h>
63 #include <openssl/ec.h>
64 #include <openssl/ecdsa.h>
65 #include <openssl/err.h>
66 #include <openssl/evp.h>
67 #include <openssl/x509.h>
71 /* EC pkey context structure */
74 /* Key and paramgen group */
81 pkey_ec_init(EVP_PKEY_CTX * ctx)
84 dctx = malloc(sizeof(EC_PKEY_CTX));
87 dctx->gen_group = NULL;
96 pkey_ec_copy(EVP_PKEY_CTX * dst, EVP_PKEY_CTX * src)
98 EC_PKEY_CTX *dctx, *sctx;
99 if (!pkey_ec_init(dst))
103 if (sctx->gen_group) {
104 dctx->gen_group = EC_GROUP_dup(sctx->gen_group);
105 if (!dctx->gen_group)
113 pkey_ec_cleanup(EVP_PKEY_CTX * ctx)
115 EC_PKEY_CTX *dctx = ctx->data;
117 EC_GROUP_free(dctx->gen_group);
123 pkey_ec_sign(EVP_PKEY_CTX * ctx, unsigned char *sig, size_t * siglen,
124 const unsigned char *tbs, size_t tbslen)
128 EC_PKEY_CTX *dctx = ctx->data;
129 EC_KEY *ec = ctx->pkey->pkey.ec;
132 *siglen = ECDSA_size(ec);
134 } else if (*siglen < (size_t) ECDSA_size(ec)) {
135 ECerr(EC_F_PKEY_EC_SIGN, EC_R_BUFFER_TOO_SMALL);
139 type = EVP_MD_type(dctx->md);
144 ret = ECDSA_sign(type, tbs, tbslen, sig, &sltmp, ec);
148 *siglen = (size_t) sltmp;
153 pkey_ec_verify(EVP_PKEY_CTX * ctx,
154 const unsigned char *sig, size_t siglen,
155 const unsigned char *tbs, size_t tbslen)
158 EC_PKEY_CTX *dctx = ctx->data;
159 EC_KEY *ec = ctx->pkey->pkey.ec;
162 type = EVP_MD_type(dctx->md);
166 ret = ECDSA_verify(type, tbs, tbslen, sig, siglen, ec);
172 pkey_ec_derive(EVP_PKEY_CTX * ctx, unsigned char *key, size_t * keylen)
176 const EC_POINT *pubkey = NULL;
177 if (!ctx->pkey || !ctx->peerkey) {
178 ECerr(EC_F_PKEY_EC_DERIVE, EC_R_KEYS_NOT_SET);
182 const EC_GROUP *group;
183 group = EC_KEY_get0_group(ctx->pkey->pkey.ec);
184 *keylen = (EC_GROUP_get_degree(group) + 7) / 8;
187 pubkey = EC_KEY_get0_public_key(ctx->peerkey->pkey.ec);
190 * NB: unlike PKCS#3 DH, if *outlen is less than maximum size this is
191 * not an error, the result is truncated.
196 ret = ECDH_compute_key(key, outlen, pubkey, ctx->pkey->pkey.ec, 0);
204 pkey_ec_ctrl(EVP_PKEY_CTX * ctx, int type, int p1, void *p2)
206 EC_PKEY_CTX *dctx = ctx->data;
209 case EVP_PKEY_CTRL_EC_PARAMGEN_CURVE_NID:
210 group = EC_GROUP_new_by_curve_name(p1);
212 ECerr(EC_F_PKEY_EC_CTRL, EC_R_INVALID_CURVE);
215 EC_GROUP_free(dctx->gen_group);
216 dctx->gen_group = group;
219 case EVP_PKEY_CTRL_MD:
220 if (EVP_MD_type((const EVP_MD *) p2) != NID_sha1 &&
221 EVP_MD_type((const EVP_MD *) p2) != NID_ecdsa_with_SHA1 &&
222 EVP_MD_type((const EVP_MD *) p2) != NID_sha224 &&
223 EVP_MD_type((const EVP_MD *) p2) != NID_sha256 &&
224 EVP_MD_type((const EVP_MD *) p2) != NID_sha384 &&
225 EVP_MD_type((const EVP_MD *) p2) != NID_sha512) {
226 ECerr(EC_F_PKEY_EC_CTRL, EC_R_INVALID_DIGEST_TYPE);
232 case EVP_PKEY_CTRL_PEER_KEY:
233 /* Default behaviour is OK */
234 case EVP_PKEY_CTRL_DIGESTINIT:
235 case EVP_PKEY_CTRL_PKCS7_SIGN:
236 case EVP_PKEY_CTRL_CMS_SIGN:
246 pkey_ec_ctrl_str(EVP_PKEY_CTX * ctx,
247 const char *type, const char *value)
249 if (!strcmp(type, "ec_paramgen_curve")) {
251 nid = EC_curve_nist2nid(value);
252 if (nid == NID_undef)
253 nid = OBJ_sn2nid(value);
254 if (nid == NID_undef)
255 nid = OBJ_ln2nid(value);
256 if (nid == NID_undef) {
257 ECerr(EC_F_PKEY_EC_CTRL_STR, EC_R_INVALID_CURVE);
260 return EVP_PKEY_CTX_set_ec_paramgen_curve_nid(ctx, nid);
266 pkey_ec_paramgen(EVP_PKEY_CTX * ctx, EVP_PKEY * pkey)
269 EC_PKEY_CTX *dctx = ctx->data;
271 if (dctx->gen_group == NULL) {
272 ECerr(EC_F_PKEY_EC_PARAMGEN, EC_R_NO_PARAMETERS_SET);
278 ret = EC_KEY_set_group(ec, dctx->gen_group);
280 EVP_PKEY_assign_EC_KEY(pkey, ec);
287 pkey_ec_keygen(EVP_PKEY_CTX * ctx, EVP_PKEY * pkey)
290 if (ctx->pkey == NULL) {
291 ECerr(EC_F_PKEY_EC_KEYGEN, EC_R_NO_PARAMETERS_SET);
297 EVP_PKEY_assign_EC_KEY(pkey, ec);
298 /* Note: if error return, pkey is freed by parent routine */
299 if (!EVP_PKEY_copy_parameters(pkey, ctx->pkey))
301 return EC_KEY_generate_key(pkey->pkey.ec);
304 const EVP_PKEY_METHOD ec_pkey_meth = {
305 .pkey_id = EVP_PKEY_EC,
307 .init = pkey_ec_init,
308 .copy = pkey_ec_copy,
309 .cleanup = pkey_ec_cleanup,
311 .paramgen = pkey_ec_paramgen,
313 .keygen = pkey_ec_keygen,
315 .sign = pkey_ec_sign,
317 .verify = pkey_ec_verify,
319 .derive = pkey_ec_derive,
321 .ctrl = pkey_ec_ctrl,
322 .ctrl_str = pkey_ec_ctrl_str