1 /* crypto/ec/ec_asn1.c */
3 * Written by Nils Larsch for the OpenSSL project.
5 /* ====================================================================
6 * Copyright (c) 2000-2003 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/err.h>
62 #include <openssl/asn1t.h>
63 #include <openssl/objects.h>
65 int EC_GROUP_get_basis_type(const EC_GROUP *group)
69 if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
70 NID_X9_62_characteristic_two_field)
71 /* everything else is currently not supported */
74 /* Find the last non-zero element of group->poly[] */
76 i < (int)OSSL_NELEM(group->poly) && group->poly[i] != 0;
81 return NID_X9_62_ppBasis;
83 return NID_X9_62_tpBasis;
85 /* everything else is currently not supported */
89 #ifndef OPENSSL_NO_EC2M
90 int EC_GROUP_get_trinomial_basis(const EC_GROUP *group, unsigned int *k)
95 if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
96 NID_X9_62_characteristic_two_field
97 || !((group->poly[0] != 0) && (group->poly[1] != 0)
98 && (group->poly[2] == 0))) {
99 ECerr(EC_F_EC_GROUP_GET_TRINOMIAL_BASIS,
100 ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
110 int EC_GROUP_get_pentanomial_basis(const EC_GROUP *group, unsigned int *k1,
111 unsigned int *k2, unsigned int *k3)
116 if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
117 NID_X9_62_characteristic_two_field
118 || !((group->poly[0] != 0) && (group->poly[1] != 0)
119 && (group->poly[2] != 0) && (group->poly[3] != 0)
120 && (group->poly[4] == 0))) {
121 ECerr(EC_F_EC_GROUP_GET_PENTANOMIAL_BASIS,
122 ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
127 *k1 = group->poly[3];
129 *k2 = group->poly[2];
131 *k3 = group->poly[1];
137 /* some structures needed for the asn1 encoding */
138 typedef struct x9_62_pentanomial_st {
144 typedef struct x9_62_characteristic_two_st {
149 /* NID_X9_62_onBasis */
151 /* NID_X9_62_tpBasis */
152 ASN1_INTEGER *tpBasis;
153 /* NID_X9_62_ppBasis */
154 X9_62_PENTANOMIAL *ppBasis;
158 } X9_62_CHARACTERISTIC_TWO;
160 typedef struct x9_62_fieldid_st {
161 ASN1_OBJECT *fieldType;
164 /* NID_X9_62_prime_field */
166 /* NID_X9_62_characteristic_two_field */
167 X9_62_CHARACTERISTIC_TWO *char_two;
173 typedef struct x9_62_curve_st {
174 ASN1_OCTET_STRING *a;
175 ASN1_OCTET_STRING *b;
176 ASN1_BIT_STRING *seed;
179 typedef struct ec_parameters_st {
181 X9_62_FIELDID *fieldID;
183 ASN1_OCTET_STRING *base;
185 ASN1_INTEGER *cofactor;
188 struct ecpk_parameters_st {
191 ASN1_OBJECT *named_curve;
192 ECPARAMETERS *parameters;
193 ASN1_NULL *implicitlyCA;
195 } /* ECPKPARAMETERS */ ;
197 /* SEC1 ECPrivateKey */
198 typedef struct ec_privatekey_st {
200 ASN1_OCTET_STRING *privateKey;
201 ECPKPARAMETERS *parameters;
202 ASN1_BIT_STRING *publicKey;
205 /* the OpenSSL ASN.1 definitions */
206 ASN1_SEQUENCE(X9_62_PENTANOMIAL) = {
207 ASN1_SIMPLE(X9_62_PENTANOMIAL, k1, LONG),
208 ASN1_SIMPLE(X9_62_PENTANOMIAL, k2, LONG),
209 ASN1_SIMPLE(X9_62_PENTANOMIAL, k3, LONG)
210 } ASN1_SEQUENCE_END(X9_62_PENTANOMIAL)
212 DECLARE_ASN1_ALLOC_FUNCTIONS(X9_62_PENTANOMIAL)
213 IMPLEMENT_ASN1_ALLOC_FUNCTIONS(X9_62_PENTANOMIAL)
215 ASN1_ADB_TEMPLATE(char_two_def) = ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, p.other, ASN1_ANY);
217 ASN1_ADB(X9_62_CHARACTERISTIC_TWO) = {
218 ADB_ENTRY(NID_X9_62_onBasis, ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, p.onBasis, ASN1_NULL)),
219 ADB_ENTRY(NID_X9_62_tpBasis, ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, p.tpBasis, ASN1_INTEGER)),
220 ADB_ENTRY(NID_X9_62_ppBasis, ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, p.ppBasis, X9_62_PENTANOMIAL))
221 } ASN1_ADB_END(X9_62_CHARACTERISTIC_TWO, 0, type, 0, &char_two_def_tt, NULL);
223 ASN1_SEQUENCE(X9_62_CHARACTERISTIC_TWO) = {
224 ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, m, LONG),
225 ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, type, ASN1_OBJECT),
226 ASN1_ADB_OBJECT(X9_62_CHARACTERISTIC_TWO)
227 } ASN1_SEQUENCE_END(X9_62_CHARACTERISTIC_TWO)
229 DECLARE_ASN1_ALLOC_FUNCTIONS(X9_62_CHARACTERISTIC_TWO)
230 IMPLEMENT_ASN1_ALLOC_FUNCTIONS(X9_62_CHARACTERISTIC_TWO)
232 ASN1_ADB_TEMPLATE(fieldID_def) = ASN1_SIMPLE(X9_62_FIELDID, p.other, ASN1_ANY);
234 ASN1_ADB(X9_62_FIELDID) = {
235 ADB_ENTRY(NID_X9_62_prime_field, ASN1_SIMPLE(X9_62_FIELDID, p.prime, ASN1_INTEGER)),
236 ADB_ENTRY(NID_X9_62_characteristic_two_field, ASN1_SIMPLE(X9_62_FIELDID, p.char_two, X9_62_CHARACTERISTIC_TWO))
237 } ASN1_ADB_END(X9_62_FIELDID, 0, fieldType, 0, &fieldID_def_tt, NULL);
239 ASN1_SEQUENCE(X9_62_FIELDID) = {
240 ASN1_SIMPLE(X9_62_FIELDID, fieldType, ASN1_OBJECT),
241 ASN1_ADB_OBJECT(X9_62_FIELDID)
242 } ASN1_SEQUENCE_END(X9_62_FIELDID)
244 ASN1_SEQUENCE(X9_62_CURVE) = {
245 ASN1_SIMPLE(X9_62_CURVE, a, ASN1_OCTET_STRING),
246 ASN1_SIMPLE(X9_62_CURVE, b, ASN1_OCTET_STRING),
247 ASN1_OPT(X9_62_CURVE, seed, ASN1_BIT_STRING)
248 } ASN1_SEQUENCE_END(X9_62_CURVE)
250 ASN1_SEQUENCE(ECPARAMETERS) = {
251 ASN1_SIMPLE(ECPARAMETERS, version, LONG),
252 ASN1_SIMPLE(ECPARAMETERS, fieldID, X9_62_FIELDID),
253 ASN1_SIMPLE(ECPARAMETERS, curve, X9_62_CURVE),
254 ASN1_SIMPLE(ECPARAMETERS, base, ASN1_OCTET_STRING),
255 ASN1_SIMPLE(ECPARAMETERS, order, ASN1_INTEGER),
256 ASN1_OPT(ECPARAMETERS, cofactor, ASN1_INTEGER)
257 } ASN1_SEQUENCE_END(ECPARAMETERS)
259 DECLARE_ASN1_ALLOC_FUNCTIONS(ECPARAMETERS)
260 IMPLEMENT_ASN1_ALLOC_FUNCTIONS(ECPARAMETERS)
262 ASN1_CHOICE(ECPKPARAMETERS) = {
263 ASN1_SIMPLE(ECPKPARAMETERS, value.named_curve, ASN1_OBJECT),
264 ASN1_SIMPLE(ECPKPARAMETERS, value.parameters, ECPARAMETERS),
265 ASN1_SIMPLE(ECPKPARAMETERS, value.implicitlyCA, ASN1_NULL)
266 } ASN1_CHOICE_END(ECPKPARAMETERS)
268 DECLARE_ASN1_FUNCTIONS_const(ECPKPARAMETERS)
269 DECLARE_ASN1_ENCODE_FUNCTIONS_const(ECPKPARAMETERS, ECPKPARAMETERS)
270 IMPLEMENT_ASN1_FUNCTIONS_const(ECPKPARAMETERS)
272 ASN1_SEQUENCE(EC_PRIVATEKEY) = {
273 ASN1_SIMPLE(EC_PRIVATEKEY, version, LONG),
274 ASN1_SIMPLE(EC_PRIVATEKEY, privateKey, ASN1_OCTET_STRING),
275 ASN1_EXP_OPT(EC_PRIVATEKEY, parameters, ECPKPARAMETERS, 0),
276 ASN1_EXP_OPT(EC_PRIVATEKEY, publicKey, ASN1_BIT_STRING, 1)
277 } ASN1_SEQUENCE_END(EC_PRIVATEKEY)
279 DECLARE_ASN1_FUNCTIONS_const(EC_PRIVATEKEY)
280 DECLARE_ASN1_ENCODE_FUNCTIONS_const(EC_PRIVATEKEY, EC_PRIVATEKEY)
281 IMPLEMENT_ASN1_FUNCTIONS_const(EC_PRIVATEKEY)
283 /* some declarations of internal function */
285 /* ec_asn1_group2field() sets the values in a X9_62_FIELDID object */
286 static int ec_asn1_group2fieldid(const EC_GROUP *, X9_62_FIELDID *);
287 /* ec_asn1_group2curve() sets the values in a X9_62_CURVE object */
288 static int ec_asn1_group2curve(const EC_GROUP *, X9_62_CURVE *);
290 * ec_asn1_parameters2group() creates a EC_GROUP object from a ECPARAMETERS
293 static EC_GROUP *ec_asn1_parameters2group(const ECPARAMETERS *);
295 * ec_asn1_group2parameters() creates a ECPARAMETERS object from a EC_GROUP
298 static ECPARAMETERS *ec_asn1_group2parameters(const EC_GROUP *,
301 * ec_asn1_pkparameters2group() creates a EC_GROUP object from a
302 * ECPKPARAMETERS object
304 static EC_GROUP *ec_asn1_pkparameters2group(const ECPKPARAMETERS *);
306 * ec_asn1_group2pkparameters() creates a ECPKPARAMETERS object from a
309 static ECPKPARAMETERS *ec_asn1_group2pkparameters(const EC_GROUP *,
312 /* the function definitions */
314 static int ec_asn1_group2fieldid(const EC_GROUP *group, X9_62_FIELDID *field)
319 if (group == NULL || field == NULL)
322 /* clear the old values (if necessary) */
323 if (field->fieldType != NULL)
324 ASN1_OBJECT_free(field->fieldType);
325 if (field->p.other != NULL)
326 ASN1_TYPE_free(field->p.other);
328 nid = EC_METHOD_get_field_type(EC_GROUP_method_of(group));
329 /* set OID for the field */
330 if ((field->fieldType = OBJ_nid2obj(nid)) == NULL) {
331 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_OBJ_LIB);
335 if (nid == NID_X9_62_prime_field) {
336 if ((tmp = BN_new()) == NULL) {
337 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE);
340 /* the parameters are specified by the prime number p */
341 if (!EC_GROUP_get_curve_GFp(group, tmp, NULL, NULL, NULL)) {
342 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_EC_LIB);
345 /* set the prime number */
346 field->p.prime = BN_to_ASN1_INTEGER(tmp, NULL);
347 if (field->p.prime == NULL) {
348 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_ASN1_LIB);
351 } else /* nid == NID_X9_62_characteristic_two_field */
352 #ifdef OPENSSL_NO_EC2M
354 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, EC_R_GF2M_NOT_SUPPORTED);
360 X9_62_CHARACTERISTIC_TWO *char_two;
362 field->p.char_two = X9_62_CHARACTERISTIC_TWO_new();
363 char_two = field->p.char_two;
365 if (char_two == NULL) {
366 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE);
370 char_two->m = (long)EC_GROUP_get_degree(group);
372 field_type = EC_GROUP_get_basis_type(group);
374 if (field_type == 0) {
375 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_EC_LIB);
378 /* set base type OID */
379 if ((char_two->type = OBJ_nid2obj(field_type)) == NULL) {
380 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_OBJ_LIB);
384 if (field_type == NID_X9_62_tpBasis) {
387 if (!EC_GROUP_get_trinomial_basis(group, &k))
390 char_two->p.tpBasis = ASN1_INTEGER_new();
391 if (!char_two->p.tpBasis) {
392 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE);
395 if (!ASN1_INTEGER_set(char_two->p.tpBasis, (long)k)) {
396 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_ASN1_LIB);
399 } else if (field_type == NID_X9_62_ppBasis) {
400 unsigned int k1, k2, k3;
402 if (!EC_GROUP_get_pentanomial_basis(group, &k1, &k2, &k3))
405 char_two->p.ppBasis = X9_62_PENTANOMIAL_new();
406 if (!char_two->p.ppBasis) {
407 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE);
412 char_two->p.ppBasis->k1 = (long)k1;
413 char_two->p.ppBasis->k2 = (long)k2;
414 char_two->p.ppBasis->k3 = (long)k3;
415 } else { /* field_type == NID_X9_62_onBasis */
417 /* for ONB the parameters are (asn1) NULL */
418 char_two->p.onBasis = ASN1_NULL_new();
419 if (!char_two->p.onBasis) {
420 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE);
434 static int ec_asn1_group2curve(const EC_GROUP *group, X9_62_CURVE *curve)
437 BIGNUM *tmp_1 = NULL, *tmp_2 = NULL;
438 unsigned char *buffer_1 = NULL, *buffer_2 = NULL,
439 *a_buf = NULL, *b_buf = NULL;
441 unsigned char char_zero = 0;
443 if (!group || !curve || !curve->a || !curve->b)
446 if ((tmp_1 = BN_new()) == NULL || (tmp_2 = BN_new()) == NULL) {
447 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_MALLOC_FAILURE);
451 nid = EC_METHOD_get_field_type(EC_GROUP_method_of(group));
454 if (nid == NID_X9_62_prime_field) {
455 if (!EC_GROUP_get_curve_GFp(group, NULL, tmp_1, tmp_2, NULL)) {
456 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_EC_LIB);
460 #ifndef OPENSSL_NO_EC2M
461 else { /* nid == NID_X9_62_characteristic_two_field */
463 if (!EC_GROUP_get_curve_GF2m(group, NULL, tmp_1, tmp_2, NULL)) {
464 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_EC_LIB);
469 len_1 = (size_t)BN_num_bytes(tmp_1);
470 len_2 = (size_t)BN_num_bytes(tmp_2);
473 /* len_1 == 0 => a == 0 */
477 if ((buffer_1 = OPENSSL_malloc(len_1)) == NULL) {
478 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_MALLOC_FAILURE);
481 if ((len_1 = BN_bn2bin(tmp_1, buffer_1)) == 0) {
482 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_BN_LIB);
489 /* len_2 == 0 => b == 0 */
493 if ((buffer_2 = OPENSSL_malloc(len_2)) == NULL) {
494 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_MALLOC_FAILURE);
497 if ((len_2 = BN_bn2bin(tmp_2, buffer_2)) == 0) {
498 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_BN_LIB);
505 if (!M_ASN1_OCTET_STRING_set(curve->a, a_buf, len_1) ||
506 !M_ASN1_OCTET_STRING_set(curve->b, b_buf, len_2)) {
507 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_ASN1_LIB);
511 /* set the seed (optional) */
514 if ((curve->seed = ASN1_BIT_STRING_new()) == NULL) {
515 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_MALLOC_FAILURE);
518 curve->seed->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07);
519 curve->seed->flags |= ASN1_STRING_FLAG_BITS_LEFT;
520 if (!ASN1_BIT_STRING_set(curve->seed, group->seed,
521 (int)group->seed_len)) {
522 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_ASN1_LIB);
527 ASN1_BIT_STRING_free(curve->seed);
535 OPENSSL_free(buffer_1);
537 OPENSSL_free(buffer_2);
545 static ECPARAMETERS *ec_asn1_group2parameters(const EC_GROUP *group,
550 ECPARAMETERS *ret = NULL;
552 unsigned char *buffer = NULL;
553 const EC_POINT *point = NULL;
554 point_conversion_form_t form;
556 if ((tmp = BN_new()) == NULL) {
557 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_MALLOC_FAILURE);
562 if ((ret = ECPARAMETERS_new()) == NULL) {
563 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_MALLOC_FAILURE);
569 /* set the version (always one) */
570 ret->version = (long)0x1;
572 /* set the fieldID */
573 if (!ec_asn1_group2fieldid(group, ret->fieldID)) {
574 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_EC_LIB);
579 if (!ec_asn1_group2curve(group, ret->curve)) {
580 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_EC_LIB);
584 /* set the base point */
585 if ((point = EC_GROUP_get0_generator(group)) == NULL) {
586 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, EC_R_UNDEFINED_GENERATOR);
590 form = EC_GROUP_get_point_conversion_form(group);
592 len = EC_POINT_point2oct(group, point, form, NULL, len, NULL);
594 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_EC_LIB);
597 if ((buffer = OPENSSL_malloc(len)) == NULL) {
598 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_MALLOC_FAILURE);
601 if (!EC_POINT_point2oct(group, point, form, buffer, len, NULL)) {
602 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_EC_LIB);
605 if (ret->base == NULL && (ret->base = ASN1_OCTET_STRING_new()) == NULL) {
606 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_MALLOC_FAILURE);
609 if (!ASN1_OCTET_STRING_set(ret->base, buffer, len)) {
610 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_ASN1_LIB);
615 if (!EC_GROUP_get_order(group, tmp, NULL)) {
616 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_EC_LIB);
619 ret->order = BN_to_ASN1_INTEGER(tmp, ret->order);
620 if (ret->order == NULL) {
621 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_ASN1_LIB);
625 /* set the cofactor (optional) */
626 if (EC_GROUP_get_cofactor(group, tmp, NULL)) {
627 ret->cofactor = BN_to_ASN1_INTEGER(tmp, ret->cofactor);
628 if (ret->cofactor == NULL) {
629 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_ASN1_LIB);
638 ECPARAMETERS_free(ret);
644 OPENSSL_free(buffer);
648 ECPKPARAMETERS *ec_asn1_group2pkparameters(const EC_GROUP *group,
649 ECPKPARAMETERS *params)
652 ECPKPARAMETERS *ret = params;
655 if ((ret = ECPKPARAMETERS_new()) == NULL) {
656 ECerr(EC_F_EC_ASN1_GROUP2PKPARAMETERS, ERR_R_MALLOC_FAILURE);
660 if (ret->type == 0 && ret->value.named_curve)
661 ASN1_OBJECT_free(ret->value.named_curve);
662 else if (ret->type == 1 && ret->value.parameters)
663 ECPARAMETERS_free(ret->value.parameters);
666 if (EC_GROUP_get_asn1_flag(group)) {
668 * use the asn1 OID to describe the the elliptic curve parameters
670 tmp = EC_GROUP_get_curve_name(group);
673 if ((ret->value.named_curve = OBJ_nid2obj(tmp)) == NULL)
676 /* we don't kmow the nid => ERROR */
679 /* use the ECPARAMETERS structure */
681 if ((ret->value.parameters =
682 ec_asn1_group2parameters(group, NULL)) == NULL)
687 ECPKPARAMETERS_free(ret);
693 static EC_GROUP *ec_asn1_parameters2group(const ECPARAMETERS *params)
696 EC_GROUP *ret = NULL;
697 BIGNUM *p = NULL, *a = NULL, *b = NULL;
698 EC_POINT *point = NULL;
701 if (!params->fieldID || !params->fieldID->fieldType ||
702 !params->fieldID->p.ptr) {
703 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_ASN1_ERROR);
707 /* now extract the curve parameters a and b */
708 if (!params->curve || !params->curve->a ||
709 !params->curve->a->data || !params->curve->b ||
710 !params->curve->b->data) {
711 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_ASN1_ERROR);
714 a = BN_bin2bn(params->curve->a->data, params->curve->a->length, NULL);
716 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_BN_LIB);
719 b = BN_bin2bn(params->curve->b->data, params->curve->b->length, NULL);
721 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_BN_LIB);
725 /* get the field parameters */
726 tmp = OBJ_obj2nid(params->fieldID->fieldType);
727 if (tmp == NID_X9_62_characteristic_two_field)
728 #ifdef OPENSSL_NO_EC2M
730 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_GF2M_NOT_SUPPORTED);
735 X9_62_CHARACTERISTIC_TWO *char_two;
737 char_two = params->fieldID->p.char_two;
739 field_bits = char_two->m;
740 if (field_bits > OPENSSL_ECC_MAX_FIELD_BITS) {
741 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_FIELD_TOO_LARGE);
745 if ((p = BN_new()) == NULL) {
746 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_MALLOC_FAILURE);
750 /* get the base type */
751 tmp = OBJ_obj2nid(char_two->type);
753 if (tmp == NID_X9_62_tpBasis) {
756 if (!char_two->p.tpBasis) {
757 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_ASN1_ERROR);
761 tmp_long = ASN1_INTEGER_get(char_two->p.tpBasis);
763 if (!(char_two->m > tmp_long && tmp_long > 0)) {
764 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP,
765 EC_R_INVALID_TRINOMIAL_BASIS);
769 /* create the polynomial */
770 if (!BN_set_bit(p, (int)char_two->m))
772 if (!BN_set_bit(p, (int)tmp_long))
774 if (!BN_set_bit(p, 0))
776 } else if (tmp == NID_X9_62_ppBasis) {
777 X9_62_PENTANOMIAL *penta;
779 penta = char_two->p.ppBasis;
781 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_ASN1_ERROR);
786 (char_two->m > penta->k3 && penta->k3 > penta->k2
787 && penta->k2 > penta->k1 && penta->k1 > 0)) {
788 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP,
789 EC_R_INVALID_PENTANOMIAL_BASIS);
793 /* create the polynomial */
794 if (!BN_set_bit(p, (int)char_two->m))
796 if (!BN_set_bit(p, (int)penta->k1))
798 if (!BN_set_bit(p, (int)penta->k2))
800 if (!BN_set_bit(p, (int)penta->k3))
802 if (!BN_set_bit(p, 0))
804 } else if (tmp == NID_X9_62_onBasis) {
805 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_NOT_IMPLEMENTED);
809 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_ASN1_ERROR);
813 /* create the EC_GROUP structure */
814 ret = EC_GROUP_new_curve_GF2m(p, a, b, NULL);
817 else if (tmp == NID_X9_62_prime_field) {
818 /* we have a curve over a prime field */
819 /* extract the prime number */
820 if (!params->fieldID->p.prime) {
821 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_ASN1_ERROR);
824 p = ASN1_INTEGER_to_BN(params->fieldID->p.prime, NULL);
826 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_ASN1_LIB);
830 if (BN_is_negative(p) || BN_is_zero(p)) {
831 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_INVALID_FIELD);
835 field_bits = BN_num_bits(p);
836 if (field_bits > OPENSSL_ECC_MAX_FIELD_BITS) {
837 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_FIELD_TOO_LARGE);
841 /* create the EC_GROUP structure */
842 ret = EC_GROUP_new_curve_GFp(p, a, b, NULL);
844 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_INVALID_FIELD);
849 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_EC_LIB);
853 /* extract seed (optional) */
854 if (params->curve->seed != NULL) {
855 if (ret->seed != NULL)
856 OPENSSL_free(ret->seed);
857 if (!(ret->seed = OPENSSL_malloc(params->curve->seed->length))) {
858 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_MALLOC_FAILURE);
861 memcpy(ret->seed, params->curve->seed->data,
862 params->curve->seed->length);
863 ret->seed_len = params->curve->seed->length;
866 if (!params->order || !params->base || !params->base->data) {
867 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_ASN1_ERROR);
871 if ((point = EC_POINT_new(ret)) == NULL)
874 /* set the point conversion form */
875 EC_GROUP_set_point_conversion_form(ret, (point_conversion_form_t)
876 (params->base->data[0] & ~0x01));
878 /* extract the ec point */
879 if (!EC_POINT_oct2point(ret, point, params->base->data,
880 params->base->length, NULL)) {
881 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_EC_LIB);
885 /* extract the order */
886 if ((a = ASN1_INTEGER_to_BN(params->order, a)) == NULL) {
887 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_ASN1_LIB);
890 if (BN_is_negative(a) || BN_is_zero(a)) {
891 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_INVALID_GROUP_ORDER);
894 if (BN_num_bits(a) > (int)field_bits + 1) { /* Hasse bound */
895 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_INVALID_GROUP_ORDER);
899 /* extract the cofactor (optional) */
900 if (params->cofactor == NULL) {
905 } else if ((b = ASN1_INTEGER_to_BN(params->cofactor, b)) == NULL) {
906 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_ASN1_LIB);
909 /* set the generator, order and cofactor (if present) */
910 if (!EC_GROUP_set_generator(ret, point, a, b)) {
911 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_EC_LIB);
919 EC_GROUP_clear_free(ret);
930 EC_POINT_free(point);
934 EC_GROUP *ec_asn1_pkparameters2group(const ECPKPARAMETERS *params)
936 EC_GROUP *ret = NULL;
939 if (params == NULL) {
940 ECerr(EC_F_EC_ASN1_PKPARAMETERS2GROUP, EC_R_MISSING_PARAMETERS);
944 if (params->type == 0) { /* the curve is given by an OID */
945 tmp = OBJ_obj2nid(params->value.named_curve);
946 if ((ret = EC_GROUP_new_by_curve_name(tmp)) == NULL) {
947 ECerr(EC_F_EC_ASN1_PKPARAMETERS2GROUP,
948 EC_R_EC_GROUP_NEW_BY_NAME_FAILURE);
951 EC_GROUP_set_asn1_flag(ret, OPENSSL_EC_NAMED_CURVE);
952 } else if (params->type == 1) { /* the parameters are given by a
953 * ECPARAMETERS structure */
954 ret = ec_asn1_parameters2group(params->value.parameters);
956 ECerr(EC_F_EC_ASN1_PKPARAMETERS2GROUP, ERR_R_EC_LIB);
959 EC_GROUP_set_asn1_flag(ret, 0x0);
960 } else if (params->type == 2) { /* implicitlyCA */
963 ECerr(EC_F_EC_ASN1_PKPARAMETERS2GROUP, EC_R_ASN1_ERROR);
970 /* EC_GROUP <-> DER encoding of ECPKPARAMETERS */
972 EC_GROUP *d2i_ECPKParameters(EC_GROUP **a, const unsigned char **in, long len)
974 EC_GROUP *group = NULL;
975 ECPKPARAMETERS *params = NULL;
976 const unsigned char *p = *in;
978 if ((params = d2i_ECPKPARAMETERS(NULL, &p, len)) == NULL) {
979 ECerr(EC_F_D2I_ECPKPARAMETERS, EC_R_D2I_ECPKPARAMETERS_FAILURE);
980 ECPKPARAMETERS_free(params);
984 if ((group = ec_asn1_pkparameters2group(params)) == NULL) {
985 ECerr(EC_F_D2I_ECPKPARAMETERS, EC_R_PKPARAMETERS2GROUP_FAILURE);
986 ECPKPARAMETERS_free(params);
991 EC_GROUP_clear_free(*a);
995 ECPKPARAMETERS_free(params);
1000 int i2d_ECPKParameters(const EC_GROUP *a, unsigned char **out)
1003 ECPKPARAMETERS *tmp = ec_asn1_group2pkparameters(a, NULL);
1005 ECerr(EC_F_I2D_ECPKPARAMETERS, EC_R_GROUP2PKPARAMETERS_FAILURE);
1008 if ((ret = i2d_ECPKPARAMETERS(tmp, out)) == 0) {
1009 ECerr(EC_F_I2D_ECPKPARAMETERS, EC_R_I2D_ECPKPARAMETERS_FAILURE);
1010 ECPKPARAMETERS_free(tmp);
1013 ECPKPARAMETERS_free(tmp);
1017 /* some EC_KEY functions */
1019 EC_KEY *d2i_ECPrivateKey(EC_KEY **a, const unsigned char **in, long len)
1023 EC_PRIVATEKEY *priv_key = NULL;
1024 const unsigned char *p = *in;
1026 if ((priv_key = d2i_EC_PRIVATEKEY(NULL, &p, len)) == NULL) {
1027 ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_EC_LIB);
1031 if (a == NULL || *a == NULL) {
1032 if ((ret = EC_KEY_new()) == NULL) {
1033 ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_MALLOC_FAILURE);
1039 if (priv_key->parameters) {
1041 EC_GROUP_clear_free(ret->group);
1042 ret->group = ec_asn1_pkparameters2group(priv_key->parameters);
1045 if (ret->group == NULL) {
1046 ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_EC_LIB);
1050 ret->version = priv_key->version;
1052 if (priv_key->privateKey) {
1053 ret->priv_key = BN_bin2bn(M_ASN1_STRING_data(priv_key->privateKey),
1054 M_ASN1_STRING_length(priv_key->privateKey),
1056 if (ret->priv_key == NULL) {
1057 ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_BN_LIB);
1061 ECerr(EC_F_D2I_ECPRIVATEKEY, EC_R_MISSING_PRIVATE_KEY);
1066 EC_POINT_clear_free(ret->pub_key);
1067 ret->pub_key = EC_POINT_new(ret->group);
1068 if (ret->pub_key == NULL) {
1069 ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_EC_LIB);
1073 if (priv_key->publicKey) {
1074 const unsigned char *pub_oct;
1077 pub_oct = M_ASN1_STRING_data(priv_key->publicKey);
1078 pub_oct_len = M_ASN1_STRING_length(priv_key->publicKey);
1080 * The first byte - point conversion form - must be present.
1082 if (pub_oct_len <= 0) {
1083 ECerr(EC_F_D2I_ECPRIVATEKEY, EC_R_BUFFER_TOO_SMALL);
1086 /* Save the point conversion form. */
1087 ret->conv_form = (point_conversion_form_t) (pub_oct[0] & ~0x01);
1088 if (!EC_POINT_oct2point(ret->group, ret->pub_key,
1089 pub_oct, (size_t)(pub_oct_len), NULL)) {
1090 ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_EC_LIB);
1095 (ret->group, ret->pub_key, ret->priv_key, NULL, NULL, NULL)) {
1096 ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_EC_LIB);
1099 /* Remember the original private-key-only encoding. */
1100 ret->enc_flag |= EC_PKEY_NO_PUBKEY;
1109 if (ret && (a == NULL || *a != ret))
1115 EC_PRIVATEKEY_free(priv_key);
1120 int i2d_ECPrivateKey(EC_KEY *a, unsigned char **out)
1122 int ret = 0, ok = 0;
1123 unsigned char *buffer = NULL;
1124 size_t buf_len = 0, tmp_len, bn_len;
1125 EC_PRIVATEKEY *priv_key = NULL;
1127 if (a == NULL || a->group == NULL || a->priv_key == NULL ||
1128 (!(a->enc_flag & EC_PKEY_NO_PUBKEY) && a->pub_key == NULL)) {
1129 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_PASSED_NULL_PARAMETER);
1133 if ((priv_key = EC_PRIVATEKEY_new()) == NULL) {
1134 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_MALLOC_FAILURE);
1138 priv_key->version = a->version;
1140 bn_len = (size_t)BN_num_bytes(a->priv_key);
1142 /* Octetstring may need leading zeros if BN is to short */
1144 buf_len = (EC_GROUP_get_degree(a->group) + 7) / 8;
1146 if (bn_len > buf_len) {
1147 ECerr(EC_F_I2D_ECPRIVATEKEY, EC_R_BUFFER_TOO_SMALL);
1151 buffer = OPENSSL_malloc(buf_len);
1152 if (buffer == NULL) {
1153 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_MALLOC_FAILURE);
1157 if (!BN_bn2bin(a->priv_key, buffer + buf_len - bn_len)) {
1158 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_BN_LIB);
1162 if (buf_len - bn_len > 0) {
1163 memset(buffer, 0, buf_len - bn_len);
1166 if (!M_ASN1_OCTET_STRING_set(priv_key->privateKey, buffer, buf_len)) {
1167 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_ASN1_LIB);
1171 if (!(a->enc_flag & EC_PKEY_NO_PARAMETERS)) {
1172 if ((priv_key->parameters =
1173 ec_asn1_group2pkparameters(a->group,
1174 priv_key->parameters)) == NULL) {
1175 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_EC_LIB);
1180 if (!(a->enc_flag & EC_PKEY_NO_PUBKEY)) {
1181 priv_key->publicKey = M_ASN1_BIT_STRING_new();
1182 if (priv_key->publicKey == NULL) {
1183 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_MALLOC_FAILURE);
1187 tmp_len = EC_POINT_point2oct(a->group, a->pub_key,
1188 a->conv_form, NULL, 0, NULL);
1190 if (tmp_len > buf_len) {
1191 unsigned char *tmp_buffer = OPENSSL_realloc(buffer, tmp_len);
1193 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_MALLOC_FAILURE);
1196 buffer = tmp_buffer;
1200 if (!EC_POINT_point2oct(a->group, a->pub_key,
1201 a->conv_form, buffer, buf_len, NULL)) {
1202 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_EC_LIB);
1206 priv_key->publicKey->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07);
1207 priv_key->publicKey->flags |= ASN1_STRING_FLAG_BITS_LEFT;
1208 if (!M_ASN1_BIT_STRING_set(priv_key->publicKey, buffer, buf_len)) {
1209 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_ASN1_LIB);
1214 if ((ret = i2d_EC_PRIVATEKEY(priv_key, out)) == 0) {
1215 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_EC_LIB);
1221 OPENSSL_free(buffer);
1223 EC_PRIVATEKEY_free(priv_key);
1224 return (ok ? ret : 0);
1227 int i2d_ECParameters(EC_KEY *a, unsigned char **out)
1230 ECerr(EC_F_I2D_ECPARAMETERS, ERR_R_PASSED_NULL_PARAMETER);
1233 return i2d_ECPKParameters(a->group, out);
1236 EC_KEY *d2i_ECParameters(EC_KEY **a, const unsigned char **in, long len)
1240 if (in == NULL || *in == NULL) {
1241 ECerr(EC_F_D2I_ECPARAMETERS, ERR_R_PASSED_NULL_PARAMETER);
1245 if (a == NULL || *a == NULL) {
1246 if ((ret = EC_KEY_new()) == NULL) {
1247 ECerr(EC_F_D2I_ECPARAMETERS, ERR_R_MALLOC_FAILURE);
1253 if (!d2i_ECPKParameters(&ret->group, in, len)) {
1254 ECerr(EC_F_D2I_ECPARAMETERS, ERR_R_EC_LIB);
1255 if (a == NULL || *a != ret)
1266 EC_KEY *o2i_ECPublicKey(EC_KEY **a, const unsigned char **in, long len)
1270 if (a == NULL || (*a) == NULL || (*a)->group == NULL) {
1272 * sorry, but a EC_GROUP-structur is necessary to set the public key
1274 ECerr(EC_F_O2I_ECPUBLICKEY, ERR_R_PASSED_NULL_PARAMETER);
1278 if (ret->pub_key == NULL &&
1279 (ret->pub_key = EC_POINT_new(ret->group)) == NULL) {
1280 ECerr(EC_F_O2I_ECPUBLICKEY, ERR_R_MALLOC_FAILURE);
1283 if (!EC_POINT_oct2point(ret->group, ret->pub_key, *in, len, NULL)) {
1284 ECerr(EC_F_O2I_ECPUBLICKEY, ERR_R_EC_LIB);
1287 /* save the point conversion form */
1288 ret->conv_form = (point_conversion_form_t) (*in[0] & ~0x01);
1293 int i2o_ECPublicKey(EC_KEY *a, unsigned char **out)
1299 ECerr(EC_F_I2O_ECPUBLICKEY, ERR_R_PASSED_NULL_PARAMETER);
1303 buf_len = EC_POINT_point2oct(a->group, a->pub_key,
1304 a->conv_form, NULL, 0, NULL);
1306 if (out == NULL || buf_len == 0)
1307 /* out == NULL => just return the length of the octet string */
1311 if ((*out = OPENSSL_malloc(buf_len)) == NULL) {
1312 ECerr(EC_F_I2O_ECPUBLICKEY, ERR_R_MALLOC_FAILURE);
1317 if (!EC_POINT_point2oct(a->group, a->pub_key, a->conv_form,
1318 *out, buf_len, NULL)) {
1319 ECerr(EC_F_I2O_ECPUBLICKEY, ERR_R_EC_LIB);