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 while (group->poly[i] != 0)
78 return NID_X9_62_ppBasis;
80 return NID_X9_62_tpBasis;
82 /* everything else is currently not supported */
86 #ifndef OPENSSL_NO_EC2M
87 int EC_GROUP_get_trinomial_basis(const EC_GROUP *group, unsigned int *k)
92 if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
93 NID_X9_62_characteristic_two_field
94 || !((group->poly[0] != 0) && (group->poly[1] != 0)
95 && (group->poly[2] == 0))) {
96 ECerr(EC_F_EC_GROUP_GET_TRINOMIAL_BASIS,
97 ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
107 int EC_GROUP_get_pentanomial_basis(const EC_GROUP *group, unsigned int *k1,
108 unsigned int *k2, unsigned int *k3)
113 if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
114 NID_X9_62_characteristic_two_field
115 || !((group->poly[0] != 0) && (group->poly[1] != 0)
116 && (group->poly[2] != 0) && (group->poly[3] != 0)
117 && (group->poly[4] == 0))) {
118 ECerr(EC_F_EC_GROUP_GET_PENTANOMIAL_BASIS,
119 ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
124 *k1 = group->poly[3];
126 *k2 = group->poly[2];
128 *k3 = group->poly[1];
134 /* some structures needed for the asn1 encoding */
135 typedef struct x9_62_pentanomial_st {
141 typedef struct x9_62_characteristic_two_st {
146 /* NID_X9_62_onBasis */
148 /* NID_X9_62_tpBasis */
149 ASN1_INTEGER *tpBasis;
150 /* NID_X9_62_ppBasis */
151 X9_62_PENTANOMIAL *ppBasis;
155 } X9_62_CHARACTERISTIC_TWO;
157 typedef struct x9_62_fieldid_st {
158 ASN1_OBJECT *fieldType;
161 /* NID_X9_62_prime_field */
163 /* NID_X9_62_characteristic_two_field */
164 X9_62_CHARACTERISTIC_TWO *char_two;
170 typedef struct x9_62_curve_st {
171 ASN1_OCTET_STRING *a;
172 ASN1_OCTET_STRING *b;
173 ASN1_BIT_STRING *seed;
176 typedef struct ec_parameters_st {
178 X9_62_FIELDID *fieldID;
180 ASN1_OCTET_STRING *base;
182 ASN1_INTEGER *cofactor;
185 struct ecpk_parameters_st {
188 ASN1_OBJECT *named_curve;
189 ECPARAMETERS *parameters;
190 ASN1_NULL *implicitlyCA;
192 } /* ECPKPARAMETERS */ ;
194 /* SEC1 ECPrivateKey */
195 typedef struct ec_privatekey_st {
197 ASN1_OCTET_STRING *privateKey;
198 ECPKPARAMETERS *parameters;
199 ASN1_BIT_STRING *publicKey;
202 /* the OpenSSL ASN.1 definitions */
203 ASN1_SEQUENCE(X9_62_PENTANOMIAL) = {
204 ASN1_SIMPLE(X9_62_PENTANOMIAL, k1, LONG),
205 ASN1_SIMPLE(X9_62_PENTANOMIAL, k2, LONG),
206 ASN1_SIMPLE(X9_62_PENTANOMIAL, k3, LONG)
207 } ASN1_SEQUENCE_END(X9_62_PENTANOMIAL)
209 DECLARE_ASN1_ALLOC_FUNCTIONS(X9_62_PENTANOMIAL)
210 IMPLEMENT_ASN1_ALLOC_FUNCTIONS(X9_62_PENTANOMIAL)
212 ASN1_ADB_TEMPLATE(char_two_def) = ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, p.other, ASN1_ANY);
214 ASN1_ADB(X9_62_CHARACTERISTIC_TWO) = {
215 ADB_ENTRY(NID_X9_62_onBasis, ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, p.onBasis, ASN1_NULL)),
216 ADB_ENTRY(NID_X9_62_tpBasis, ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, p.tpBasis, ASN1_INTEGER)),
217 ADB_ENTRY(NID_X9_62_ppBasis, ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, p.ppBasis, X9_62_PENTANOMIAL))
218 } ASN1_ADB_END(X9_62_CHARACTERISTIC_TWO, 0, type, 0, &char_two_def_tt, NULL);
220 ASN1_SEQUENCE(X9_62_CHARACTERISTIC_TWO) = {
221 ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, m, LONG),
222 ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, type, ASN1_OBJECT),
223 ASN1_ADB_OBJECT(X9_62_CHARACTERISTIC_TWO)
224 } ASN1_SEQUENCE_END(X9_62_CHARACTERISTIC_TWO)
226 DECLARE_ASN1_ALLOC_FUNCTIONS(X9_62_CHARACTERISTIC_TWO)
227 IMPLEMENT_ASN1_ALLOC_FUNCTIONS(X9_62_CHARACTERISTIC_TWO)
229 ASN1_ADB_TEMPLATE(fieldID_def) = ASN1_SIMPLE(X9_62_FIELDID, p.other, ASN1_ANY);
231 ASN1_ADB(X9_62_FIELDID) = {
232 ADB_ENTRY(NID_X9_62_prime_field, ASN1_SIMPLE(X9_62_FIELDID, p.prime, ASN1_INTEGER)),
233 ADB_ENTRY(NID_X9_62_characteristic_two_field, ASN1_SIMPLE(X9_62_FIELDID, p.char_two, X9_62_CHARACTERISTIC_TWO))
234 } ASN1_ADB_END(X9_62_FIELDID, 0, fieldType, 0, &fieldID_def_tt, NULL);
236 ASN1_SEQUENCE(X9_62_FIELDID) = {
237 ASN1_SIMPLE(X9_62_FIELDID, fieldType, ASN1_OBJECT),
238 ASN1_ADB_OBJECT(X9_62_FIELDID)
239 } ASN1_SEQUENCE_END(X9_62_FIELDID)
241 ASN1_SEQUENCE(X9_62_CURVE) = {
242 ASN1_SIMPLE(X9_62_CURVE, a, ASN1_OCTET_STRING),
243 ASN1_SIMPLE(X9_62_CURVE, b, ASN1_OCTET_STRING),
244 ASN1_OPT(X9_62_CURVE, seed, ASN1_BIT_STRING)
245 } ASN1_SEQUENCE_END(X9_62_CURVE)
247 ASN1_SEQUENCE(ECPARAMETERS) = {
248 ASN1_SIMPLE(ECPARAMETERS, version, LONG),
249 ASN1_SIMPLE(ECPARAMETERS, fieldID, X9_62_FIELDID),
250 ASN1_SIMPLE(ECPARAMETERS, curve, X9_62_CURVE),
251 ASN1_SIMPLE(ECPARAMETERS, base, ASN1_OCTET_STRING),
252 ASN1_SIMPLE(ECPARAMETERS, order, ASN1_INTEGER),
253 ASN1_OPT(ECPARAMETERS, cofactor, ASN1_INTEGER)
254 } ASN1_SEQUENCE_END(ECPARAMETERS)
256 DECLARE_ASN1_ALLOC_FUNCTIONS(ECPARAMETERS)
257 IMPLEMENT_ASN1_ALLOC_FUNCTIONS(ECPARAMETERS)
259 ASN1_CHOICE(ECPKPARAMETERS) = {
260 ASN1_SIMPLE(ECPKPARAMETERS, value.named_curve, ASN1_OBJECT),
261 ASN1_SIMPLE(ECPKPARAMETERS, value.parameters, ECPARAMETERS),
262 ASN1_SIMPLE(ECPKPARAMETERS, value.implicitlyCA, ASN1_NULL)
263 } ASN1_CHOICE_END(ECPKPARAMETERS)
265 DECLARE_ASN1_FUNCTIONS_const(ECPKPARAMETERS)
266 DECLARE_ASN1_ENCODE_FUNCTIONS_const(ECPKPARAMETERS, ECPKPARAMETERS)
267 IMPLEMENT_ASN1_FUNCTIONS_const(ECPKPARAMETERS)
269 ASN1_SEQUENCE(EC_PRIVATEKEY) = {
270 ASN1_SIMPLE(EC_PRIVATEKEY, version, LONG),
271 ASN1_SIMPLE(EC_PRIVATEKEY, privateKey, ASN1_OCTET_STRING),
272 ASN1_EXP_OPT(EC_PRIVATEKEY, parameters, ECPKPARAMETERS, 0),
273 ASN1_EXP_OPT(EC_PRIVATEKEY, publicKey, ASN1_BIT_STRING, 1)
274 } ASN1_SEQUENCE_END(EC_PRIVATEKEY)
276 DECLARE_ASN1_FUNCTIONS_const(EC_PRIVATEKEY)
277 DECLARE_ASN1_ENCODE_FUNCTIONS_const(EC_PRIVATEKEY, EC_PRIVATEKEY)
278 IMPLEMENT_ASN1_FUNCTIONS_const(EC_PRIVATEKEY)
280 /* some declarations of internal function */
282 /* ec_asn1_group2field() sets the values in a X9_62_FIELDID object */
283 static int ec_asn1_group2fieldid(const EC_GROUP *, X9_62_FIELDID *);
284 /* ec_asn1_group2curve() sets the values in a X9_62_CURVE object */
285 static int ec_asn1_group2curve(const EC_GROUP *, X9_62_CURVE *);
287 * ec_asn1_parameters2group() creates a EC_GROUP object from a ECPARAMETERS
290 static EC_GROUP *ec_asn1_parameters2group(const ECPARAMETERS *);
292 * ec_asn1_group2parameters() creates a ECPARAMETERS object from a EC_GROUP
295 static ECPARAMETERS *ec_asn1_group2parameters(const EC_GROUP *,
298 * ec_asn1_pkparameters2group() creates a EC_GROUP object from a
299 * ECPKPARAMETERS object
301 static EC_GROUP *ec_asn1_pkparameters2group(const ECPKPARAMETERS *);
303 * ec_asn1_group2pkparameters() creates a ECPKPARAMETERS object from a
306 static ECPKPARAMETERS *ec_asn1_group2pkparameters(const EC_GROUP *,
309 /* the function definitions */
311 static int ec_asn1_group2fieldid(const EC_GROUP *group, X9_62_FIELDID *field)
316 if (group == NULL || field == NULL)
319 /* clear the old values (if necessary) */
320 ASN1_OBJECT_free(field->fieldType);
321 if (field->p.other != NULL)
322 ASN1_TYPE_free(field->p.other);
324 nid = EC_METHOD_get_field_type(EC_GROUP_method_of(group));
325 /* set OID for the field */
326 if ((field->fieldType = OBJ_nid2obj(nid)) == NULL) {
327 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_OBJ_LIB);
331 if (nid == NID_X9_62_prime_field) {
332 if ((tmp = BN_new()) == NULL) {
333 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE);
336 /* the parameters are specified by the prime number p */
337 if (!EC_GROUP_get_curve_GFp(group, tmp, NULL, NULL, NULL)) {
338 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_EC_LIB);
341 /* set the prime number */
342 field->p.prime = BN_to_ASN1_INTEGER(tmp, NULL);
343 if (field->p.prime == NULL) {
344 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_ASN1_LIB);
347 } else /* nid == NID_X9_62_characteristic_two_field */
348 #ifdef OPENSSL_NO_EC2M
350 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, EC_R_GF2M_NOT_SUPPORTED);
356 X9_62_CHARACTERISTIC_TWO *char_two;
358 field->p.char_two = X9_62_CHARACTERISTIC_TWO_new();
359 char_two = field->p.char_two;
361 if (char_two == NULL) {
362 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE);
366 char_two->m = (long)EC_GROUP_get_degree(group);
368 field_type = EC_GROUP_get_basis_type(group);
370 if (field_type == 0) {
371 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_EC_LIB);
374 /* set base type OID */
375 if ((char_two->type = OBJ_nid2obj(field_type)) == NULL) {
376 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_OBJ_LIB);
380 if (field_type == NID_X9_62_tpBasis) {
383 if (!EC_GROUP_get_trinomial_basis(group, &k))
386 char_two->p.tpBasis = ASN1_INTEGER_new();
387 if (!char_two->p.tpBasis) {
388 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE);
391 if (!ASN1_INTEGER_set(char_two->p.tpBasis, (long)k)) {
392 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_ASN1_LIB);
395 } else if (field_type == NID_X9_62_ppBasis) {
396 unsigned int k1, k2, k3;
398 if (!EC_GROUP_get_pentanomial_basis(group, &k1, &k2, &k3))
401 char_two->p.ppBasis = X9_62_PENTANOMIAL_new();
402 if (!char_two->p.ppBasis) {
403 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE);
408 char_two->p.ppBasis->k1 = (long)k1;
409 char_two->p.ppBasis->k2 = (long)k2;
410 char_two->p.ppBasis->k3 = (long)k3;
411 } else { /* field_type == NID_X9_62_onBasis */
413 /* for ONB the parameters are (asn1) NULL */
414 char_two->p.onBasis = ASN1_NULL_new();
415 if (!char_two->p.onBasis) {
416 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE);
430 static int ec_asn1_group2curve(const EC_GROUP *group, X9_62_CURVE *curve)
433 BIGNUM *tmp_1 = NULL, *tmp_2 = NULL;
434 unsigned char *buffer_1 = NULL, *buffer_2 = NULL,
435 *a_buf = NULL, *b_buf = NULL;
437 unsigned char char_zero = 0;
439 if (!group || !curve || !curve->a || !curve->b)
442 if ((tmp_1 = BN_new()) == NULL || (tmp_2 = BN_new()) == NULL) {
443 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_MALLOC_FAILURE);
447 nid = EC_METHOD_get_field_type(EC_GROUP_method_of(group));
450 if (nid == NID_X9_62_prime_field) {
451 if (!EC_GROUP_get_curve_GFp(group, NULL, tmp_1, tmp_2, NULL)) {
452 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_EC_LIB);
456 #ifndef OPENSSL_NO_EC2M
457 else { /* nid == NID_X9_62_characteristic_two_field */
459 if (!EC_GROUP_get_curve_GF2m(group, NULL, tmp_1, tmp_2, NULL)) {
460 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_EC_LIB);
465 len_1 = (size_t)BN_num_bytes(tmp_1);
466 len_2 = (size_t)BN_num_bytes(tmp_2);
469 /* len_1 == 0 => a == 0 */
473 if ((buffer_1 = OPENSSL_malloc(len_1)) == NULL) {
474 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_MALLOC_FAILURE);
477 if ((len_1 = BN_bn2bin(tmp_1, buffer_1)) == 0) {
478 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_BN_LIB);
485 /* len_2 == 0 => b == 0 */
489 if ((buffer_2 = OPENSSL_malloc(len_2)) == NULL) {
490 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_MALLOC_FAILURE);
493 if ((len_2 = BN_bn2bin(tmp_2, buffer_2)) == 0) {
494 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_BN_LIB);
501 if (!ASN1_OCTET_STRING_set(curve->a, a_buf, len_1) ||
502 !ASN1_OCTET_STRING_set(curve->b, b_buf, len_2)) {
503 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_ASN1_LIB);
507 /* set the seed (optional) */
510 if ((curve->seed = ASN1_BIT_STRING_new()) == NULL) {
511 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_MALLOC_FAILURE);
514 curve->seed->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07);
515 curve->seed->flags |= ASN1_STRING_FLAG_BITS_LEFT;
516 if (!ASN1_BIT_STRING_set(curve->seed, group->seed,
517 (int)group->seed_len)) {
518 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_ASN1_LIB);
523 ASN1_BIT_STRING_free(curve->seed);
531 OPENSSL_free(buffer_1);
533 OPENSSL_free(buffer_2);
541 static ECPARAMETERS *ec_asn1_group2parameters(const EC_GROUP *group,
546 ECPARAMETERS *ret = NULL;
548 unsigned char *buffer = NULL;
549 const EC_POINT *point = NULL;
550 point_conversion_form_t form;
552 if ((tmp = BN_new()) == NULL) {
553 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_MALLOC_FAILURE);
558 if ((ret = ECPARAMETERS_new()) == NULL) {
559 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_MALLOC_FAILURE);
565 /* set the version (always one) */
566 ret->version = (long)0x1;
568 /* set the fieldID */
569 if (!ec_asn1_group2fieldid(group, ret->fieldID)) {
570 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_EC_LIB);
575 if (!ec_asn1_group2curve(group, ret->curve)) {
576 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_EC_LIB);
580 /* set the base point */
581 if ((point = EC_GROUP_get0_generator(group)) == NULL) {
582 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, EC_R_UNDEFINED_GENERATOR);
586 form = EC_GROUP_get_point_conversion_form(group);
588 len = EC_POINT_point2oct(group, point, form, NULL, len, NULL);
590 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_EC_LIB);
593 if ((buffer = OPENSSL_malloc(len)) == NULL) {
594 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_MALLOC_FAILURE);
597 if (!EC_POINT_point2oct(group, point, form, buffer, len, NULL)) {
598 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_EC_LIB);
601 if (ret->base == NULL && (ret->base = ASN1_OCTET_STRING_new()) == NULL) {
602 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_MALLOC_FAILURE);
605 if (!ASN1_OCTET_STRING_set(ret->base, buffer, len)) {
606 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_ASN1_LIB);
611 if (!EC_GROUP_get_order(group, tmp, NULL)) {
612 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_EC_LIB);
615 ret->order = BN_to_ASN1_INTEGER(tmp, ret->order);
616 if (ret->order == NULL) {
617 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_ASN1_LIB);
621 /* set the cofactor (optional) */
622 if (EC_GROUP_get_cofactor(group, tmp, NULL)) {
623 ret->cofactor = BN_to_ASN1_INTEGER(tmp, ret->cofactor);
624 if (ret->cofactor == NULL) {
625 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_ASN1_LIB);
634 ECPARAMETERS_free(ret);
640 OPENSSL_free(buffer);
644 ECPKPARAMETERS *ec_asn1_group2pkparameters(const EC_GROUP *group,
645 ECPKPARAMETERS *params)
648 ECPKPARAMETERS *ret = params;
651 if ((ret = ECPKPARAMETERS_new()) == NULL) {
652 ECerr(EC_F_EC_ASN1_GROUP2PKPARAMETERS, ERR_R_MALLOC_FAILURE);
657 ASN1_OBJECT_free(ret->value.named_curve);
658 else if (ret->type == 1 && ret->value.parameters)
659 ECPARAMETERS_free(ret->value.parameters);
662 if (EC_GROUP_get_asn1_flag(group)) {
664 * use the asn1 OID to describe the the elliptic curve parameters
666 tmp = EC_GROUP_get_curve_name(group);
669 if ((ret->value.named_curve = OBJ_nid2obj(tmp)) == NULL)
672 /* we don't kmow the nid => ERROR */
675 /* use the ECPARAMETERS structure */
677 if ((ret->value.parameters =
678 ec_asn1_group2parameters(group, NULL)) == NULL)
683 ECPKPARAMETERS_free(ret);
689 static EC_GROUP *ec_asn1_parameters2group(const ECPARAMETERS *params)
692 EC_GROUP *ret = NULL;
693 BIGNUM *p = NULL, *a = NULL, *b = NULL;
694 EC_POINT *point = NULL;
697 if (!params->fieldID || !params->fieldID->fieldType ||
698 !params->fieldID->p.ptr) {
699 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_ASN1_ERROR);
703 /* now extract the curve parameters a and b */
704 if (!params->curve || !params->curve->a ||
705 !params->curve->a->data || !params->curve->b ||
706 !params->curve->b->data) {
707 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_ASN1_ERROR);
710 a = BN_bin2bn(params->curve->a->data, params->curve->a->length, NULL);
712 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_BN_LIB);
715 b = BN_bin2bn(params->curve->b->data, params->curve->b->length, NULL);
717 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_BN_LIB);
721 /* get the field parameters */
722 tmp = OBJ_obj2nid(params->fieldID->fieldType);
723 if (tmp == NID_X9_62_characteristic_two_field)
724 #ifdef OPENSSL_NO_EC2M
726 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_GF2M_NOT_SUPPORTED);
731 X9_62_CHARACTERISTIC_TWO *char_two;
733 char_two = params->fieldID->p.char_two;
735 field_bits = char_two->m;
736 if (field_bits > OPENSSL_ECC_MAX_FIELD_BITS) {
737 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_FIELD_TOO_LARGE);
741 if ((p = BN_new()) == NULL) {
742 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_MALLOC_FAILURE);
746 /* get the base type */
747 tmp = OBJ_obj2nid(char_two->type);
749 if (tmp == NID_X9_62_tpBasis) {
752 if (!char_two->p.tpBasis) {
753 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_ASN1_ERROR);
757 tmp_long = ASN1_INTEGER_get(char_two->p.tpBasis);
759 if (!(char_two->m > tmp_long && tmp_long > 0)) {
760 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP,
761 EC_R_INVALID_TRINOMIAL_BASIS);
765 /* create the polynomial */
766 if (!BN_set_bit(p, (int)char_two->m))
768 if (!BN_set_bit(p, (int)tmp_long))
770 if (!BN_set_bit(p, 0))
772 } else if (tmp == NID_X9_62_ppBasis) {
773 X9_62_PENTANOMIAL *penta;
775 penta = char_two->p.ppBasis;
777 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_ASN1_ERROR);
782 (char_two->m > penta->k3 && penta->k3 > penta->k2
783 && penta->k2 > penta->k1 && penta->k1 > 0)) {
784 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP,
785 EC_R_INVALID_PENTANOMIAL_BASIS);
789 /* create the polynomial */
790 if (!BN_set_bit(p, (int)char_two->m))
792 if (!BN_set_bit(p, (int)penta->k1))
794 if (!BN_set_bit(p, (int)penta->k2))
796 if (!BN_set_bit(p, (int)penta->k3))
798 if (!BN_set_bit(p, 0))
800 } else if (tmp == NID_X9_62_onBasis) {
801 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_NOT_IMPLEMENTED);
805 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_ASN1_ERROR);
809 /* create the EC_GROUP structure */
810 ret = EC_GROUP_new_curve_GF2m(p, a, b, NULL);
813 else if (tmp == NID_X9_62_prime_field) {
814 /* we have a curve over a prime field */
815 /* extract the prime number */
816 if (!params->fieldID->p.prime) {
817 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_ASN1_ERROR);
820 p = ASN1_INTEGER_to_BN(params->fieldID->p.prime, NULL);
822 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_ASN1_LIB);
826 if (BN_is_negative(p) || BN_is_zero(p)) {
827 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_INVALID_FIELD);
831 field_bits = BN_num_bits(p);
832 if (field_bits > OPENSSL_ECC_MAX_FIELD_BITS) {
833 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_FIELD_TOO_LARGE);
837 /* create the EC_GROUP structure */
838 ret = EC_GROUP_new_curve_GFp(p, a, b, NULL);
840 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_INVALID_FIELD);
845 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_EC_LIB);
849 /* extract seed (optional) */
850 if (params->curve->seed != NULL) {
851 if (ret->seed != NULL)
852 OPENSSL_free(ret->seed);
853 if (!(ret->seed = OPENSSL_malloc(params->curve->seed->length))) {
854 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_MALLOC_FAILURE);
857 memcpy(ret->seed, params->curve->seed->data,
858 params->curve->seed->length);
859 ret->seed_len = params->curve->seed->length;
862 if (!params->order || !params->base || !params->base->data) {
863 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_ASN1_ERROR);
867 if ((point = EC_POINT_new(ret)) == NULL)
870 /* set the point conversion form */
871 EC_GROUP_set_point_conversion_form(ret, (point_conversion_form_t)
872 (params->base->data[0] & ~0x01));
874 /* extract the ec point */
875 if (!EC_POINT_oct2point(ret, point, params->base->data,
876 params->base->length, NULL)) {
877 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_EC_LIB);
881 /* extract the order */
882 if ((a = ASN1_INTEGER_to_BN(params->order, a)) == NULL) {
883 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_ASN1_LIB);
886 if (BN_is_negative(a) || BN_is_zero(a)) {
887 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_INVALID_GROUP_ORDER);
890 if (BN_num_bits(a) > (int)field_bits + 1) { /* Hasse bound */
891 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_INVALID_GROUP_ORDER);
895 /* extract the cofactor (optional) */
896 if (params->cofactor == NULL) {
901 } else if ((b = ASN1_INTEGER_to_BN(params->cofactor, b)) == NULL) {
902 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_ASN1_LIB);
905 /* set the generator, order and cofactor (if present) */
906 if (!EC_GROUP_set_generator(ret, point, a, b)) {
907 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_EC_LIB);
915 EC_GROUP_clear_free(ret);
925 EC_POINT_free(point);
929 EC_GROUP *ec_asn1_pkparameters2group(const ECPKPARAMETERS *params)
931 EC_GROUP *ret = NULL;
934 if (params == NULL) {
935 ECerr(EC_F_EC_ASN1_PKPARAMETERS2GROUP, EC_R_MISSING_PARAMETERS);
939 if (params->type == 0) { /* the curve is given by an OID */
940 tmp = OBJ_obj2nid(params->value.named_curve);
941 if ((ret = EC_GROUP_new_by_curve_name(tmp)) == NULL) {
942 ECerr(EC_F_EC_ASN1_PKPARAMETERS2GROUP,
943 EC_R_EC_GROUP_NEW_BY_NAME_FAILURE);
946 EC_GROUP_set_asn1_flag(ret, OPENSSL_EC_NAMED_CURVE);
947 } else if (params->type == 1) { /* the parameters are given by a
948 * ECPARAMETERS structure */
949 ret = ec_asn1_parameters2group(params->value.parameters);
951 ECerr(EC_F_EC_ASN1_PKPARAMETERS2GROUP, ERR_R_EC_LIB);
954 EC_GROUP_set_asn1_flag(ret, 0x0);
955 } else if (params->type == 2) { /* implicitlyCA */
958 ECerr(EC_F_EC_ASN1_PKPARAMETERS2GROUP, EC_R_ASN1_ERROR);
965 /* EC_GROUP <-> DER encoding of ECPKPARAMETERS */
967 EC_GROUP *d2i_ECPKParameters(EC_GROUP **a, const unsigned char **in, long len)
969 EC_GROUP *group = NULL;
970 ECPKPARAMETERS *params = NULL;
972 if ((params = d2i_ECPKPARAMETERS(NULL, in, len)) == NULL) {
973 ECerr(EC_F_D2I_ECPKPARAMETERS, EC_R_D2I_ECPKPARAMETERS_FAILURE);
974 ECPKPARAMETERS_free(params);
978 if ((group = ec_asn1_pkparameters2group(params)) == NULL) {
979 ECerr(EC_F_D2I_ECPKPARAMETERS, EC_R_PKPARAMETERS2GROUP_FAILURE);
980 ECPKPARAMETERS_free(params);
985 EC_GROUP_clear_free(*a);
989 ECPKPARAMETERS_free(params);
993 int i2d_ECPKParameters(const EC_GROUP *a, unsigned char **out)
996 ECPKPARAMETERS *tmp = ec_asn1_group2pkparameters(a, NULL);
998 ECerr(EC_F_I2D_ECPKPARAMETERS, EC_R_GROUP2PKPARAMETERS_FAILURE);
1001 if ((ret = i2d_ECPKPARAMETERS(tmp, out)) == 0) {
1002 ECerr(EC_F_I2D_ECPKPARAMETERS, EC_R_I2D_ECPKPARAMETERS_FAILURE);
1003 ECPKPARAMETERS_free(tmp);
1006 ECPKPARAMETERS_free(tmp);
1010 /* some EC_KEY functions */
1012 EC_KEY *d2i_ECPrivateKey(EC_KEY **a, const unsigned char **in, long len)
1016 EC_PRIVATEKEY *priv_key = NULL;
1018 if ((priv_key = d2i_EC_PRIVATEKEY(NULL, in, len)) == NULL) {
1019 ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_EC_LIB);
1023 if (a == NULL || *a == NULL) {
1024 if ((ret = EC_KEY_new()) == NULL) {
1025 ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_MALLOC_FAILURE);
1031 if (priv_key->parameters) {
1032 EC_GROUP_clear_free(ret->group);
1033 ret->group = ec_asn1_pkparameters2group(priv_key->parameters);
1036 if (ret->group == NULL) {
1037 ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_EC_LIB);
1041 ret->version = priv_key->version;
1043 if (priv_key->privateKey) {
1044 ret->priv_key = BN_bin2bn(ASN1_STRING_data(priv_key->privateKey),
1045 ASN1_STRING_length(priv_key->privateKey),
1047 if (ret->priv_key == NULL) {
1048 ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_BN_LIB);
1052 ECerr(EC_F_D2I_ECPRIVATEKEY, EC_R_MISSING_PRIVATE_KEY);
1056 EC_POINT_clear_free(ret->pub_key);
1057 ret->pub_key = EC_POINT_new(ret->group);
1058 if (ret->pub_key == NULL) {
1059 ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_EC_LIB);
1063 if (priv_key->publicKey) {
1064 const unsigned char *pub_oct;
1067 pub_oct = ASN1_STRING_data(priv_key->publicKey);
1068 pub_oct_len = ASN1_STRING_length(priv_key->publicKey);
1070 * The first byte - point conversion form - must be present.
1072 if (pub_oct_len <= 0) {
1073 ECerr(EC_F_D2I_ECPRIVATEKEY, EC_R_BUFFER_TOO_SMALL);
1076 /* Save the point conversion form. */
1077 ret->conv_form = (point_conversion_form_t) (pub_oct[0] & ~0x01);
1078 if (!EC_POINT_oct2point(ret->group, ret->pub_key,
1079 pub_oct, (size_t)(pub_oct_len), NULL)) {
1080 ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_EC_LIB);
1085 (ret->group, ret->pub_key, ret->priv_key, NULL, NULL, NULL)) {
1086 ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_EC_LIB);
1089 /* Remember the original private-key-only encoding. */
1090 ret->enc_flag |= EC_PKEY_NO_PUBKEY;
1098 if (a == NULL || *a != ret)
1104 EC_PRIVATEKEY_free(priv_key);
1109 int i2d_ECPrivateKey(EC_KEY *a, unsigned char **out)
1111 int ret = 0, ok = 0;
1112 unsigned char *buffer = NULL;
1113 size_t buf_len = 0, tmp_len, bn_len;
1114 EC_PRIVATEKEY *priv_key = NULL;
1116 if (a == NULL || a->group == NULL || a->priv_key == NULL ||
1117 (!(a->enc_flag & EC_PKEY_NO_PUBKEY) && a->pub_key == NULL)) {
1118 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_PASSED_NULL_PARAMETER);
1122 if ((priv_key = EC_PRIVATEKEY_new()) == NULL) {
1123 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_MALLOC_FAILURE);
1127 priv_key->version = a->version;
1129 bn_len = (size_t)BN_num_bytes(a->priv_key);
1131 /* Octetstring may need leading zeros if BN is to short */
1133 buf_len = (EC_GROUP_get_degree(a->group) + 7) / 8;
1135 if (bn_len > buf_len) {
1136 ECerr(EC_F_I2D_ECPRIVATEKEY, EC_R_BUFFER_TOO_SMALL);
1140 buffer = OPENSSL_malloc(buf_len);
1141 if (buffer == NULL) {
1142 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_MALLOC_FAILURE);
1146 if (!BN_bn2bin(a->priv_key, buffer + buf_len - bn_len)) {
1147 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_BN_LIB);
1151 if (buf_len - bn_len > 0) {
1152 memset(buffer, 0, buf_len - bn_len);
1155 if (!ASN1_OCTET_STRING_set(priv_key->privateKey, buffer, buf_len)) {
1156 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_ASN1_LIB);
1160 if (!(a->enc_flag & EC_PKEY_NO_PARAMETERS)) {
1161 if ((priv_key->parameters =
1162 ec_asn1_group2pkparameters(a->group,
1163 priv_key->parameters)) == NULL) {
1164 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_EC_LIB);
1169 if (!(a->enc_flag & EC_PKEY_NO_PUBKEY)) {
1170 priv_key->publicKey = ASN1_BIT_STRING_new();
1171 if (priv_key->publicKey == NULL) {
1172 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_MALLOC_FAILURE);
1176 tmp_len = EC_POINT_point2oct(a->group, a->pub_key,
1177 a->conv_form, NULL, 0, NULL);
1179 if (tmp_len > buf_len) {
1180 unsigned char *tmp_buffer = OPENSSL_realloc(buffer, tmp_len);
1182 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_MALLOC_FAILURE);
1185 buffer = tmp_buffer;
1189 if (!EC_POINT_point2oct(a->group, a->pub_key,
1190 a->conv_form, buffer, buf_len, NULL)) {
1191 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_EC_LIB);
1195 priv_key->publicKey->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07);
1196 priv_key->publicKey->flags |= ASN1_STRING_FLAG_BITS_LEFT;
1197 if (!ASN1_BIT_STRING_set(priv_key->publicKey, buffer, buf_len)) {
1198 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_ASN1_LIB);
1203 if ((ret = i2d_EC_PRIVATEKEY(priv_key, out)) == 0) {
1204 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_EC_LIB);
1210 OPENSSL_free(buffer);
1212 EC_PRIVATEKEY_free(priv_key);
1213 return (ok ? ret : 0);
1216 int i2d_ECParameters(EC_KEY *a, unsigned char **out)
1219 ECerr(EC_F_I2D_ECPARAMETERS, ERR_R_PASSED_NULL_PARAMETER);
1222 return i2d_ECPKParameters(a->group, out);
1225 EC_KEY *d2i_ECParameters(EC_KEY **a, const unsigned char **in, long len)
1229 if (in == NULL || *in == NULL) {
1230 ECerr(EC_F_D2I_ECPARAMETERS, ERR_R_PASSED_NULL_PARAMETER);
1234 if (a == NULL || *a == NULL) {
1235 if ((ret = EC_KEY_new()) == NULL) {
1236 ECerr(EC_F_D2I_ECPARAMETERS, ERR_R_MALLOC_FAILURE);
1242 if (!d2i_ECPKParameters(&ret->group, in, len)) {
1243 ECerr(EC_F_D2I_ECPARAMETERS, ERR_R_EC_LIB);
1244 if (a == NULL || *a != ret)
1255 EC_KEY *o2i_ECPublicKey(EC_KEY **a, const unsigned char **in, long len)
1259 if (a == NULL || (*a) == NULL || (*a)->group == NULL) {
1261 * sorry, but a EC_GROUP-structur is necessary to set the public key
1263 ECerr(EC_F_O2I_ECPUBLICKEY, ERR_R_PASSED_NULL_PARAMETER);
1267 if (ret->pub_key == NULL &&
1268 (ret->pub_key = EC_POINT_new(ret->group)) == NULL) {
1269 ECerr(EC_F_O2I_ECPUBLICKEY, ERR_R_MALLOC_FAILURE);
1272 if (!EC_POINT_oct2point(ret->group, ret->pub_key, *in, len, NULL)) {
1273 ECerr(EC_F_O2I_ECPUBLICKEY, ERR_R_EC_LIB);
1276 /* save the point conversion form */
1277 ret->conv_form = (point_conversion_form_t) (*in[0] & ~0x01);
1282 int i2o_ECPublicKey(EC_KEY *a, unsigned char **out)
1288 ECerr(EC_F_I2O_ECPUBLICKEY, ERR_R_PASSED_NULL_PARAMETER);
1292 buf_len = EC_POINT_point2oct(a->group, a->pub_key,
1293 a->conv_form, NULL, 0, NULL);
1295 if (out == NULL || buf_len == 0)
1296 /* out == NULL => just return the length of the octet string */
1300 if ((*out = OPENSSL_malloc(buf_len)) == NULL) {
1301 ECerr(EC_F_I2O_ECPUBLICKEY, ERR_R_MALLOC_FAILURE);
1306 if (!EC_POINT_point2oct(a->group, a->pub_key, a->conv_form,
1307 *out, buf_len, NULL)) {
1308 ECerr(EC_F_I2O_ECPUBLICKEY, ERR_R_EC_LIB);