1 /* Written by Dr Stephen N Henson (shenson@bigfoot.com) for the OpenSSL
4 /* ====================================================================
5 * Copyright (c) 2005 The OpenSSL Project. All rights reserved.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
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
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/)"
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.
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.
33 * 6. Redistributions of any form whatsoever must retain the following
35 * "This product includes software developed by the OpenSSL Project
36 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
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 * ====================================================================
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).
60 #include <openssl/x509.h>
61 #include <openssl/ec.h>
63 static int eckey_param2type(int *pptype, void **ppval, EC_KEY *ec_key)
65 const EC_GROUP *group;
67 if (ec_key == NULL || (group = EC_KEY_get0_group(ec_key)) == NULL)
69 ECerr(EC_F_ECKEY_PARAM2TYPE, EC_R_MISSING_PARAMETERS);
72 if (EC_GROUP_get_asn1_flag(group)
73 && (nid = EC_GROUP_get_curve_name(group)))
74 /* we have a 'named curve' => just set the OID */
76 *ppval = OBJ_nid2obj(nid);
77 *pptype = V_ASN1_OBJECT;
79 else /* explicit parameters */
81 ASN1_STRING *pstr = NULL;
82 pstr = ASN1_STRING_new();
85 pstr->length = i2d_ECParameters(ec_key, &pstr->data);
88 ASN1_STRING_free(pstr);
89 ECerr(EC_F_ECKEY_PARAM2TYPE, ERR_R_EC_LIB);
93 *pptype = V_ASN1_SEQUENCE;
98 static int eckey_pub_encode(X509_PUBKEY *pk, EVP_PKEY *pkey)
100 EC_KEY *ec_key = pkey->pkey.ec;
103 unsigned char *penc = NULL, *p;
106 if (!eckey_param2type(&ptype, &pval, ec_key))
108 ECerr(EC_F_ECKEY_PUB_ENCODE, ERR_R_EC_LIB);
111 penclen = i2o_ECPublicKey(ec_key, NULL);
114 penc = OPENSSL_malloc(penclen);
118 penclen = i2o_ECPublicKey(ec_key, &p);
121 if (X509_PUBKEY_set0_param(pk, OBJ_nid2obj(EVP_PKEY_DSA),
122 ptype, pval, penc, penclen))
125 if (ptype == V_ASN1_OBJECT)
126 ASN1_OBJECT_free(pval);
128 ASN1_STRING_free(pval);
134 static EC_KEY *eckey_type2param(int ptype, void *pval)
136 EC_KEY *eckey = NULL;
137 if (ptype == V_ASN1_SEQUENCE)
139 ASN1_STRING *pstr = pval;
140 const unsigned char *pm = NULL;
143 pmlen = pstr->length;
144 if (!(eckey = d2i_ECParameters(NULL, &pm, pmlen)))
146 ECerr(EC_F_ECKEY_TYPE2PARAM, EC_R_DECODE_ERROR);
150 else if (ptype == V_ASN1_OBJECT)
152 ASN1_OBJECT *poid = pval;
155 /* type == V_ASN1_OBJECT => the parameters are given
158 if ((eckey = EC_KEY_new()) == NULL)
160 ECerr(EC_F_ECKEY_TYPE2PARAM, ERR_R_MALLOC_FAILURE);
163 group = EC_GROUP_new_by_curve_name(OBJ_obj2nid(poid));
166 EC_GROUP_set_asn1_flag(group, OPENSSL_EC_NAMED_CURVE);
167 if (EC_KEY_set_group(eckey, group) == 0)
169 EC_GROUP_free(group);
173 ECerr(EC_F_ECKEY_TYPE2PARAM, EC_R_DECODE_ERROR);
185 static int eckey_pub_decode(EVP_PKEY *pkey, X509_PUBKEY *pubkey)
187 const unsigned char *p = NULL;
190 EC_KEY *eckey = NULL;
193 if (!X509_PUBKEY_get0_param(NULL, &p, &pklen, &palg, pubkey))
195 X509_ALGOR_get0(NULL, &ptype, &pval, palg);
197 eckey = eckey_type2param(ptype, pval);
201 ECerr(EC_F_ECKEY_PUB_DECODE, ERR_R_EC_LIB);
205 /* We have parameters now set public key */
206 if (!o2i_ECPublicKey(&eckey, &p, pklen))
208 ECerr(EC_F_ECKEY_PUB_DECODE, EC_R_DECODE_ERROR);
212 EVP_PKEY_assign_EC_KEY(pkey, eckey);
221 static int eckey_priv_decode(EVP_PKEY *pkey, PKCS8_PRIV_KEY_INFO *p8)
223 const unsigned char *p = NULL;
226 EC_KEY *eckey = NULL;
229 if (!PKCS8_pkey_get0(NULL, &p, &pklen, &palg, p8))
231 X509_ALGOR_get0(NULL, &ptype, &pval, palg);
233 eckey = eckey_type2param(ptype, pval);
238 /* We have parameters now set private key */
239 if (!d2i_ECPrivateKey(&eckey, &p, pklen))
241 ECerr(EC_F_ECKEY_PRIV_DECODE, EC_R_DECODE_ERROR);
245 /* calculate public key (if necessary) */
246 if (EC_KEY_get0_public_key(eckey) == NULL)
248 const BIGNUM *priv_key;
249 const EC_GROUP *group;
251 /* the public key was not included in the SEC1 private
252 * key => calculate the public key */
253 group = EC_KEY_get0_group(eckey);
254 pub_key = EC_POINT_new(group);
257 ECerr(EC_F_ECKEY_PRIV_DECODE, ERR_R_EC_LIB);
260 if (!EC_POINT_copy(pub_key, EC_GROUP_get0_generator(group)))
262 EC_POINT_free(pub_key);
263 ECerr(EC_F_ECKEY_PRIV_DECODE, ERR_R_EC_LIB);
266 priv_key = EC_KEY_get0_private_key(eckey);
267 if (!EC_POINT_mul(group, pub_key, priv_key, NULL, NULL, NULL))
269 EC_POINT_free(pub_key);
270 ECerr(EC_F_ECKEY_PRIV_DECODE, ERR_R_EC_LIB);
273 if (EC_KEY_set_public_key(eckey, pub_key) == 0)
275 EC_POINT_free(pub_key);
276 ECerr(EC_F_ECKEY_PRIV_DECODE, ERR_R_EC_LIB);
279 EC_POINT_free(pub_key);
282 EVP_PKEY_assign_EC_KEY(pkey, eckey);
286 ECerr(EC_F_ECKEY_PRIV_DECODE, ERR_R_EC_LIB);
293 static int eckey_priv_encode(PKCS8_PRIV_KEY_INFO *p8, EVP_PKEY *pkey)
296 unsigned char *ep, *p;
299 unsigned int tmp_flags, old_flags;
301 ec_key = pkey->pkey.ec;
303 if (!eckey_param2type(&ptype, &pval, ec_key))
305 ECerr(EC_F_ECKEY_PRIV_ENCODE, EC_R_DECODE_ERROR);
309 /* set the private key */
311 /* do not include the parameters in the SEC1 private key
312 * see PKCS#11 12.11 */
313 old_flags = EC_KEY_get_enc_flags(ec_key);
314 tmp_flags = old_flags | EC_PKEY_NO_PARAMETERS;
315 EC_KEY_set_enc_flags(ec_key, tmp_flags);
316 eplen = i2d_ECPrivateKey(ec_key, NULL);
319 EC_KEY_set_enc_flags(ec_key, old_flags);
320 ECerr(EC_F_ECKEY_PRIV_ENCODE, ERR_R_EC_LIB);
323 ep = (unsigned char *) OPENSSL_malloc(eplen);
326 EC_KEY_set_enc_flags(ec_key, old_flags);
327 ECerr(EC_F_ECKEY_PRIV_ENCODE, ERR_R_MALLOC_FAILURE);
331 if (!i2d_ECPrivateKey(ec_key, &p))
333 EC_KEY_set_enc_flags(ec_key, old_flags);
335 ECerr(EC_F_ECKEY_PRIV_ENCODE, ERR_R_EC_LIB);
337 /* restore old encoding flags */
338 EC_KEY_set_enc_flags(ec_key, old_flags);
340 if (!PKCS8_pkey_set0(p8, OBJ_nid2obj(NID_X9_62_id_ecPublicKey), 0,
341 ptype, pval, ep, eplen))
347 EVP_PKEY_ASN1_METHOD eckey_asn1_meth =