1 /* $OpenBSD: ec_ameth.c,v 1.25 2018/08/24 20:22:15 tb 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).
61 #include <openssl/opensslconf.h>
63 #include <openssl/bn.h>
64 #include <openssl/ec.h>
65 #include <openssl/err.h>
66 #include <openssl/x509.h>
69 #include "asn1_locl.h"
72 eckey_param2type(int *pptype, void **ppval, EC_KEY * ec_key)
74 const EC_GROUP *group;
76 if (ec_key == NULL || (group = EC_KEY_get0_group(ec_key)) == NULL) {
77 ECerror(EC_R_MISSING_PARAMETERS);
80 if (EC_GROUP_get_asn1_flag(group) &&
81 (nid = EC_GROUP_get_curve_name(group))) {
82 /* we have a 'named curve' => just set the OID */
83 *ppval = OBJ_nid2obj(nid);
84 *pptype = V_ASN1_OBJECT;
86 /* explicit parameters */
87 ASN1_STRING *pstr = NULL;
88 pstr = ASN1_STRING_new();
91 pstr->length = i2d_ECParameters(ec_key, &pstr->data);
92 if (pstr->length <= 0) {
93 ASN1_STRING_free(pstr);
94 ECerror(ERR_R_EC_LIB);
98 *pptype = V_ASN1_SEQUENCE;
104 eckey_pub_encode(X509_PUBKEY * pk, const EVP_PKEY * pkey)
106 EC_KEY *ec_key = pkey->pkey.ec;
109 unsigned char *penc = NULL, *p;
112 if (!eckey_param2type(&ptype, &pval, ec_key)) {
113 ECerror(ERR_R_EC_LIB);
116 penclen = i2o_ECPublicKey(ec_key, NULL);
119 penc = malloc(penclen);
123 penclen = i2o_ECPublicKey(ec_key, &p);
126 if (X509_PUBKEY_set0_param(pk, OBJ_nid2obj(EVP_PKEY_EC),
127 ptype, pval, penc, penclen))
130 if (ptype == V_ASN1_OBJECT)
131 ASN1_OBJECT_free(pval);
133 ASN1_STRING_free(pval);
139 eckey_type2param(int ptype, const void *pval)
141 EC_KEY *eckey = NULL;
143 if (ptype == V_ASN1_SEQUENCE) {
144 const ASN1_STRING *pstr = pval;
145 const unsigned char *pm = NULL;
149 pmlen = pstr->length;
150 if (!(eckey = d2i_ECParameters(NULL, &pm, pmlen))) {
151 ECerror(EC_R_DECODE_ERROR);
154 } else if (ptype == V_ASN1_OBJECT) {
155 const ASN1_OBJECT *poid = pval;
159 * type == V_ASN1_OBJECT => the parameters are given by an
162 if ((eckey = EC_KEY_new()) == NULL) {
163 ECerror(ERR_R_MALLOC_FAILURE);
166 group = EC_GROUP_new_by_curve_name(OBJ_obj2nid(poid));
169 EC_GROUP_set_asn1_flag(group, OPENSSL_EC_NAMED_CURVE);
170 if (EC_KEY_set_group(eckey, group) == 0)
172 EC_GROUP_free(group);
174 ECerror(EC_R_DECODE_ERROR);
187 eckey_pub_decode(EVP_PKEY * pkey, X509_PUBKEY * pubkey)
189 const unsigned char *p = NULL;
192 EC_KEY *eckey = NULL;
195 if (!X509_PUBKEY_get0_param(NULL, &p, &pklen, &palg, pubkey))
197 X509_ALGOR_get0(NULL, &ptype, &pval, palg);
199 eckey = eckey_type2param(ptype, pval);
202 ECerror(ERR_R_EC_LIB);
205 /* We have parameters now set public key */
206 if (!o2i_ECPublicKey(&eckey, &p, pklen)) {
207 ECerror(EC_R_DECODE_ERROR);
210 EVP_PKEY_assign_EC_KEY(pkey, eckey);
220 eckey_pub_cmp(const EVP_PKEY * a, const EVP_PKEY * b)
223 const EC_GROUP *group = EC_KEY_get0_group(b->pkey.ec);
224 const EC_POINT *pa = EC_KEY_get0_public_key(a->pkey.ec), *pb = EC_KEY_get0_public_key(b->pkey.ec);
226 r = EC_POINT_cmp(group, pa, pb, NULL);
235 eckey_priv_decode(EVP_PKEY * pkey, const PKCS8_PRIV_KEY_INFO * p8)
237 const unsigned char *p = NULL;
240 EC_KEY *eckey = NULL;
241 const X509_ALGOR *palg;
243 if (!PKCS8_pkey_get0(NULL, &p, &pklen, &palg, p8))
245 X509_ALGOR_get0(NULL, &ptype, &pval, palg);
247 eckey = eckey_type2param(ptype, pval);
252 /* We have parameters now set private key */
253 if (!d2i_ECPrivateKey(&eckey, &p, pklen)) {
254 ECerror(EC_R_DECODE_ERROR);
257 /* calculate public key (if necessary) */
258 if (EC_KEY_get0_public_key(eckey) == NULL) {
259 const BIGNUM *priv_key;
260 const EC_GROUP *group;
263 * the public key was not included in the SEC1 private key =>
264 * calculate the public key
266 group = EC_KEY_get0_group(eckey);
267 pub_key = EC_POINT_new(group);
268 if (pub_key == NULL) {
269 ECerror(ERR_R_EC_LIB);
272 if (!EC_POINT_copy(pub_key, EC_GROUP_get0_generator(group))) {
273 EC_POINT_free(pub_key);
274 ECerror(ERR_R_EC_LIB);
277 priv_key = EC_KEY_get0_private_key(eckey);
278 if (!EC_POINT_mul(group, pub_key, priv_key, NULL, NULL, NULL)) {
279 EC_POINT_free(pub_key);
280 ECerror(ERR_R_EC_LIB);
283 if (EC_KEY_set_public_key(eckey, pub_key) == 0) {
284 EC_POINT_free(pub_key);
285 ECerror(ERR_R_EC_LIB);
288 EC_POINT_free(pub_key);
290 EVP_PKEY_assign_EC_KEY(pkey, eckey);
294 ECerror(ERR_R_EC_LIB);
302 eckey_priv_encode(PKCS8_PRIV_KEY_INFO * p8, const EVP_PKEY * pkey)
305 unsigned char *ep, *p;
308 unsigned int tmp_flags, old_flags;
310 ec_key = pkey->pkey.ec;
312 if (!eckey_param2type(&ptype, &pval, ec_key)) {
313 ECerror(EC_R_DECODE_ERROR);
316 /* set the private key */
319 * do not include the parameters in the SEC1 private key see PKCS#11
322 old_flags = EC_KEY_get_enc_flags(ec_key);
323 tmp_flags = old_flags | EC_PKEY_NO_PARAMETERS;
324 EC_KEY_set_enc_flags(ec_key, tmp_flags);
325 eplen = i2d_ECPrivateKey(ec_key, NULL);
327 EC_KEY_set_enc_flags(ec_key, old_flags);
328 ECerror(ERR_R_EC_LIB);
333 EC_KEY_set_enc_flags(ec_key, old_flags);
334 ECerror(ERR_R_MALLOC_FAILURE);
338 if (!i2d_ECPrivateKey(ec_key, &p)) {
339 EC_KEY_set_enc_flags(ec_key, old_flags);
341 ECerror(ERR_R_EC_LIB);
344 /* restore old encoding flags */
345 EC_KEY_set_enc_flags(ec_key, old_flags);
347 if (!PKCS8_pkey_set0(p8, OBJ_nid2obj(NID_X9_62_id_ecPublicKey), 0,
348 ptype, pval, ep, eplen))
355 int_ec_size(const EVP_PKEY * pkey)
357 return ECDSA_size(pkey->pkey.ec);
361 ec_bits(const EVP_PKEY * pkey)
363 BIGNUM *order = BN_new();
364 const EC_GROUP *group;
371 group = EC_KEY_get0_group(pkey->pkey.ec);
372 if (!EC_GROUP_get_order(group, order, NULL)) {
377 ret = BN_num_bits(order);
383 ec_missing_parameters(const EVP_PKEY * pkey)
385 if (EC_KEY_get0_group(pkey->pkey.ec) == NULL)
391 ec_copy_parameters(EVP_PKEY * to, const EVP_PKEY * from)
393 return EC_KEY_set_group(to->pkey.ec, EC_KEY_get0_group(from->pkey.ec));
397 ec_cmp_parameters(const EVP_PKEY * a, const EVP_PKEY * b)
399 const EC_GROUP *group_a = EC_KEY_get0_group(a->pkey.ec), *group_b = EC_KEY_get0_group(b->pkey.ec);
400 if (EC_GROUP_cmp(group_a, group_b, NULL))
407 int_ec_free(EVP_PKEY * pkey)
409 EC_KEY_free(pkey->pkey.ec);
413 do_EC_KEY_print(BIO * bp, const EC_KEY * x, int off, int ktype)
415 unsigned char *buffer = NULL;
417 size_t buf_len = 0, i;
418 int ret = 0, reason = ERR_R_BIO_LIB;
419 BIGNUM *pub_key = NULL, *order = NULL;
421 const EC_GROUP *group;
422 const EC_POINT *public_key;
423 const BIGNUM *priv_key;
425 if (x == NULL || (group = EC_KEY_get0_group(x)) == NULL) {
426 reason = ERR_R_PASSED_NULL_PARAMETER;
431 reason = ERR_R_MALLOC_FAILURE;
435 public_key = EC_KEY_get0_public_key(x);
436 if (public_key != NULL) {
437 if ((pub_key = EC_POINT_point2bn(group, public_key,
438 EC_KEY_get_conv_form(x), NULL, ctx)) == NULL) {
439 reason = ERR_R_EC_LIB;
443 buf_len = (size_t) BN_num_bytes(pub_key);
447 priv_key = EC_KEY_get0_private_key(x);
448 if (priv_key && (i = (size_t) BN_num_bytes(priv_key)) > buf_len)
455 if ((buffer = malloc(buf_len)) == NULL) {
456 reason = ERR_R_MALLOC_FAILURE;
461 ecstr = "Private-Key";
463 ecstr = "Public-Key";
465 ecstr = "ECDSA-Parameters";
467 if (!BIO_indent(bp, off, 128))
469 if ((order = BN_new()) == NULL)
471 if (!EC_GROUP_get_order(group, order, NULL))
473 if (BIO_printf(bp, "%s: (%d bit)\n", ecstr,
474 BN_num_bits(order)) <= 0)
477 if ((priv_key != NULL) && !ASN1_bn_print(bp, "priv:", priv_key,
480 if ((pub_key != NULL) && !ASN1_bn_print(bp, "pub: ", pub_key,
483 if (!ECPKParameters_print(bp, group, off))
497 eckey_param_decode(EVP_PKEY * pkey,
498 const unsigned char **pder, int derlen)
501 if (!(eckey = d2i_ECParameters(NULL, pder, derlen))) {
502 ECerror(ERR_R_EC_LIB);
505 EVP_PKEY_assign_EC_KEY(pkey, eckey);
510 eckey_param_encode(const EVP_PKEY * pkey, unsigned char **pder)
512 return i2d_ECParameters(pkey->pkey.ec, pder);
516 eckey_param_print(BIO * bp, const EVP_PKEY * pkey, int indent,
519 return do_EC_KEY_print(bp, pkey->pkey.ec, indent, 0);
523 eckey_pub_print(BIO * bp, const EVP_PKEY * pkey, int indent,
526 return do_EC_KEY_print(bp, pkey->pkey.ec, indent, 1);
531 eckey_priv_print(BIO * bp, const EVP_PKEY * pkey, int indent,
534 return do_EC_KEY_print(bp, pkey->pkey.ec, indent, 2);
538 old_ec_priv_decode(EVP_PKEY * pkey,
539 const unsigned char **pder, int derlen)
542 if (!(ec = d2i_ECPrivateKey(NULL, pder, derlen))) {
543 ECerror(EC_R_DECODE_ERROR);
546 EVP_PKEY_assign_EC_KEY(pkey, ec);
551 old_ec_priv_encode(const EVP_PKEY * pkey, unsigned char **pder)
553 return i2d_ECPrivateKey(pkey->pkey.ec, pder);
557 ec_pkey_ctrl(EVP_PKEY * pkey, int op, long arg1, void *arg2)
560 case ASN1_PKEY_CTRL_PKCS7_SIGN:
563 X509_ALGOR *alg1, *alg2;
564 PKCS7_SIGNER_INFO_get0_algs(arg2, NULL, &alg1, &alg2);
565 if (alg1 == NULL || alg1->algorithm == NULL)
567 hnid = OBJ_obj2nid(alg1->algorithm);
568 if (hnid == NID_undef)
570 if (!OBJ_find_sigid_by_algs(&snid, hnid, EVP_PKEY_id(pkey)))
572 X509_ALGOR_set0(alg2, OBJ_nid2obj(snid), V_ASN1_UNDEF, 0);
576 case ASN1_PKEY_CTRL_DEFAULT_MD_NID:
577 *(int *) arg2 = NID_sha1;
587 const EVP_PKEY_ASN1_METHOD eckey_asn1_meth = {
588 .pkey_id = EVP_PKEY_EC,
589 .pkey_base_id = EVP_PKEY_EC,
592 .info = "OpenSSL EC algorithm",
594 .pub_decode = eckey_pub_decode,
595 .pub_encode = eckey_pub_encode,
596 .pub_cmp = eckey_pub_cmp,
597 .pub_print = eckey_pub_print,
599 .priv_decode = eckey_priv_decode,
600 .priv_encode = eckey_priv_encode,
601 .priv_print = eckey_priv_print,
603 .pkey_size = int_ec_size,
604 .pkey_bits = ec_bits,
606 .param_decode = eckey_param_decode,
607 .param_encode = eckey_param_encode,
608 .param_missing = ec_missing_parameters,
609 .param_copy = ec_copy_parameters,
610 .param_cmp = ec_cmp_parameters,
611 .param_print = eckey_param_print,
613 .pkey_free = int_ec_free,
614 .pkey_ctrl = ec_pkey_ctrl,
615 .old_priv_decode = old_ec_priv_decode,
616 .old_priv_encode = old_ec_priv_encode