2 * Written by Nils Larsch for the OpenSSL project.
4 /* ====================================================================
5 * Copyright (c) 2000-2003 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/err.h>
61 #include <openssl/asn1t.h>
62 #include <openssl/objects.h>
64 int EC_GROUP_get_basis_type(const EC_GROUP *group)
68 if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
69 NID_X9_62_characteristic_two_field)
70 /* everything else is currently not supported */
73 while (group->poly[i] != 0)
77 return NID_X9_62_ppBasis;
79 return NID_X9_62_tpBasis;
81 /* everything else is currently not supported */
85 #ifndef OPENSSL_NO_EC2M
86 int EC_GROUP_get_trinomial_basis(const EC_GROUP *group, unsigned int *k)
91 if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
92 NID_X9_62_characteristic_two_field
93 || !((group->poly[0] != 0) && (group->poly[1] != 0)
94 && (group->poly[2] == 0))) {
95 ECerr(EC_F_EC_GROUP_GET_TRINOMIAL_BASIS,
96 ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
106 int EC_GROUP_get_pentanomial_basis(const EC_GROUP *group, unsigned int *k1,
107 unsigned int *k2, unsigned int *k3)
112 if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
113 NID_X9_62_characteristic_two_field
114 || !((group->poly[0] != 0) && (group->poly[1] != 0)
115 && (group->poly[2] != 0) && (group->poly[3] != 0)
116 && (group->poly[4] == 0))) {
117 ECerr(EC_F_EC_GROUP_GET_PENTANOMIAL_BASIS,
118 ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
123 *k1 = group->poly[3];
125 *k2 = group->poly[2];
127 *k3 = group->poly[1];
133 /* some structures needed for the asn1 encoding */
134 typedef struct x9_62_pentanomial_st {
140 typedef struct x9_62_characteristic_two_st {
145 /* NID_X9_62_onBasis */
147 /* NID_X9_62_tpBasis */
148 ASN1_INTEGER *tpBasis;
149 /* NID_X9_62_ppBasis */
150 X9_62_PENTANOMIAL *ppBasis;
154 } X9_62_CHARACTERISTIC_TWO;
156 typedef struct x9_62_fieldid_st {
157 ASN1_OBJECT *fieldType;
160 /* NID_X9_62_prime_field */
162 /* NID_X9_62_characteristic_two_field */
163 X9_62_CHARACTERISTIC_TWO *char_two;
169 typedef struct x9_62_curve_st {
170 ASN1_OCTET_STRING *a;
171 ASN1_OCTET_STRING *b;
172 ASN1_BIT_STRING *seed;
175 typedef struct ec_parameters_st {
177 X9_62_FIELDID *fieldID;
179 ASN1_OCTET_STRING *base;
181 ASN1_INTEGER *cofactor;
184 struct ecpk_parameters_st {
187 ASN1_OBJECT *named_curve;
188 ECPARAMETERS *parameters;
189 ASN1_NULL *implicitlyCA;
191 } /* ECPKPARAMETERS */ ;
193 /* SEC1 ECPrivateKey */
194 typedef struct ec_privatekey_st {
196 ASN1_OCTET_STRING *privateKey;
197 ECPKPARAMETERS *parameters;
198 ASN1_BIT_STRING *publicKey;
201 /* the OpenSSL ASN.1 definitions */
202 ASN1_SEQUENCE(X9_62_PENTANOMIAL) = {
203 ASN1_SIMPLE(X9_62_PENTANOMIAL, k1, LONG),
204 ASN1_SIMPLE(X9_62_PENTANOMIAL, k2, LONG),
205 ASN1_SIMPLE(X9_62_PENTANOMIAL, k3, LONG)
206 } static_ASN1_SEQUENCE_END(X9_62_PENTANOMIAL)
208 DECLARE_ASN1_ALLOC_FUNCTIONS(X9_62_PENTANOMIAL)
209 IMPLEMENT_ASN1_ALLOC_FUNCTIONS(X9_62_PENTANOMIAL)
211 ASN1_ADB_TEMPLATE(char_two_def) = ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, p.other, ASN1_ANY);
213 ASN1_ADB(X9_62_CHARACTERISTIC_TWO) = {
214 ADB_ENTRY(NID_X9_62_onBasis, ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, p.onBasis, ASN1_NULL)),
215 ADB_ENTRY(NID_X9_62_tpBasis, ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, p.tpBasis, ASN1_INTEGER)),
216 ADB_ENTRY(NID_X9_62_ppBasis, ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, p.ppBasis, X9_62_PENTANOMIAL))
217 } ASN1_ADB_END(X9_62_CHARACTERISTIC_TWO, 0, type, 0, &char_two_def_tt, NULL);
219 ASN1_SEQUENCE(X9_62_CHARACTERISTIC_TWO) = {
220 ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, m, LONG),
221 ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, type, ASN1_OBJECT),
222 ASN1_ADB_OBJECT(X9_62_CHARACTERISTIC_TWO)
223 } static_ASN1_SEQUENCE_END(X9_62_CHARACTERISTIC_TWO)
225 DECLARE_ASN1_ALLOC_FUNCTIONS(X9_62_CHARACTERISTIC_TWO)
226 IMPLEMENT_ASN1_ALLOC_FUNCTIONS(X9_62_CHARACTERISTIC_TWO)
228 ASN1_ADB_TEMPLATE(fieldID_def) = ASN1_SIMPLE(X9_62_FIELDID, p.other, ASN1_ANY);
230 ASN1_ADB(X9_62_FIELDID) = {
231 ADB_ENTRY(NID_X9_62_prime_field, ASN1_SIMPLE(X9_62_FIELDID, p.prime, ASN1_INTEGER)),
232 ADB_ENTRY(NID_X9_62_characteristic_two_field, ASN1_SIMPLE(X9_62_FIELDID, p.char_two, X9_62_CHARACTERISTIC_TWO))
233 } ASN1_ADB_END(X9_62_FIELDID, 0, fieldType, 0, &fieldID_def_tt, NULL);
235 ASN1_SEQUENCE(X9_62_FIELDID) = {
236 ASN1_SIMPLE(X9_62_FIELDID, fieldType, ASN1_OBJECT),
237 ASN1_ADB_OBJECT(X9_62_FIELDID)
238 } static_ASN1_SEQUENCE_END(X9_62_FIELDID)
240 ASN1_SEQUENCE(X9_62_CURVE) = {
241 ASN1_SIMPLE(X9_62_CURVE, a, ASN1_OCTET_STRING),
242 ASN1_SIMPLE(X9_62_CURVE, b, ASN1_OCTET_STRING),
243 ASN1_OPT(X9_62_CURVE, seed, ASN1_BIT_STRING)
244 } static_ASN1_SEQUENCE_END(X9_62_CURVE)
246 ASN1_SEQUENCE(ECPARAMETERS) = {
247 ASN1_SIMPLE(ECPARAMETERS, version, LONG),
248 ASN1_SIMPLE(ECPARAMETERS, fieldID, X9_62_FIELDID),
249 ASN1_SIMPLE(ECPARAMETERS, curve, X9_62_CURVE),
250 ASN1_SIMPLE(ECPARAMETERS, base, ASN1_OCTET_STRING),
251 ASN1_SIMPLE(ECPARAMETERS, order, ASN1_INTEGER),
252 ASN1_OPT(ECPARAMETERS, cofactor, ASN1_INTEGER)
253 } static_ASN1_SEQUENCE_END(ECPARAMETERS)
255 DECLARE_ASN1_ALLOC_FUNCTIONS(ECPARAMETERS)
256 IMPLEMENT_ASN1_ALLOC_FUNCTIONS(ECPARAMETERS)
258 ASN1_CHOICE(ECPKPARAMETERS) = {
259 ASN1_SIMPLE(ECPKPARAMETERS, value.named_curve, ASN1_OBJECT),
260 ASN1_SIMPLE(ECPKPARAMETERS, value.parameters, ECPARAMETERS),
261 ASN1_SIMPLE(ECPKPARAMETERS, value.implicitlyCA, ASN1_NULL)
262 } static_ASN1_CHOICE_END(ECPKPARAMETERS)
264 DECLARE_ASN1_FUNCTIONS_const(ECPKPARAMETERS)
265 DECLARE_ASN1_ENCODE_FUNCTIONS_const(ECPKPARAMETERS, ECPKPARAMETERS)
266 IMPLEMENT_ASN1_FUNCTIONS_const(ECPKPARAMETERS)
268 ASN1_SEQUENCE(EC_PRIVATEKEY) = {
269 ASN1_SIMPLE(EC_PRIVATEKEY, version, LONG),
270 ASN1_SIMPLE(EC_PRIVATEKEY, privateKey, ASN1_OCTET_STRING),
271 ASN1_EXP_OPT(EC_PRIVATEKEY, parameters, ECPKPARAMETERS, 0),
272 ASN1_EXP_OPT(EC_PRIVATEKEY, publicKey, ASN1_BIT_STRING, 1)
273 } static_ASN1_SEQUENCE_END(EC_PRIVATEKEY)
275 DECLARE_ASN1_FUNCTIONS_const(EC_PRIVATEKEY)
276 DECLARE_ASN1_ENCODE_FUNCTIONS_const(EC_PRIVATEKEY, EC_PRIVATEKEY)
277 IMPLEMENT_ASN1_FUNCTIONS_const(EC_PRIVATEKEY)
279 /* some declarations of internal function */
281 /* ec_asn1_group2field() sets the values in a X9_62_FIELDID object */
282 static int ec_asn1_group2fieldid(const EC_GROUP *, X9_62_FIELDID *);
283 /* ec_asn1_group2curve() sets the values in a X9_62_CURVE object */
284 static int ec_asn1_group2curve(const EC_GROUP *, X9_62_CURVE *);
286 * ec_asn1_parameters2group() creates a EC_GROUP object from a ECPARAMETERS
289 static EC_GROUP *ec_asn1_parameters2group(const ECPARAMETERS *);
291 * ec_asn1_group2parameters() creates a ECPARAMETERS object from a EC_GROUP
294 static ECPARAMETERS *ec_asn1_group2parameters(const EC_GROUP *,
297 * ec_asn1_pkparameters2group() creates a EC_GROUP object from a
298 * ECPKPARAMETERS object
300 static EC_GROUP *ec_asn1_pkparameters2group(const ECPKPARAMETERS *);
302 * ec_asn1_group2pkparameters() creates a ECPKPARAMETERS object from a
305 static ECPKPARAMETERS *ec_asn1_group2pkparameters(const EC_GROUP *,
308 /* the function definitions */
310 static int ec_asn1_group2fieldid(const EC_GROUP *group, X9_62_FIELDID *field)
315 if (group == NULL || field == NULL)
318 /* clear the old values (if necessary) */
319 ASN1_OBJECT_free(field->fieldType);
320 ASN1_TYPE_free(field->p.other);
322 nid = EC_METHOD_get_field_type(EC_GROUP_method_of(group));
323 /* set OID for the field */
324 if ((field->fieldType = OBJ_nid2obj(nid)) == NULL) {
325 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_OBJ_LIB);
329 if (nid == NID_X9_62_prime_field) {
330 if ((tmp = BN_new()) == NULL) {
331 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE);
334 /* the parameters are specified by the prime number p */
335 if (!EC_GROUP_get_curve_GFp(group, tmp, NULL, NULL, NULL)) {
336 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_EC_LIB);
339 /* set the prime number */
340 field->p.prime = BN_to_ASN1_INTEGER(tmp, NULL);
341 if (field->p.prime == NULL) {
342 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_ASN1_LIB);
345 } else if (nid == NID_X9_62_characteristic_two_field)
346 #ifdef OPENSSL_NO_EC2M
348 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, EC_R_GF2M_NOT_SUPPORTED);
354 X9_62_CHARACTERISTIC_TWO *char_two;
356 field->p.char_two = X9_62_CHARACTERISTIC_TWO_new();
357 char_two = field->p.char_two;
359 if (char_two == NULL) {
360 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE);
364 char_two->m = (long)EC_GROUP_get_degree(group);
366 field_type = EC_GROUP_get_basis_type(group);
368 if (field_type == 0) {
369 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_EC_LIB);
372 /* set base type OID */
373 if ((char_two->type = OBJ_nid2obj(field_type)) == NULL) {
374 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_OBJ_LIB);
378 if (field_type == NID_X9_62_tpBasis) {
381 if (!EC_GROUP_get_trinomial_basis(group, &k))
384 char_two->p.tpBasis = ASN1_INTEGER_new();
385 if (char_two->p.tpBasis == NULL) {
386 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE);
389 if (!ASN1_INTEGER_set(char_two->p.tpBasis, (long)k)) {
390 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_ASN1_LIB);
393 } else if (field_type == NID_X9_62_ppBasis) {
394 unsigned int k1, k2, k3;
396 if (!EC_GROUP_get_pentanomial_basis(group, &k1, &k2, &k3))
399 char_two->p.ppBasis = X9_62_PENTANOMIAL_new();
400 if (char_two->p.ppBasis == NULL) {
401 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE);
406 char_two->p.ppBasis->k1 = (long)k1;
407 char_two->p.ppBasis->k2 = (long)k2;
408 char_two->p.ppBasis->k3 = (long)k3;
409 } else { /* field_type == NID_X9_62_onBasis */
411 /* for ONB the parameters are (asn1) NULL */
412 char_two->p.onBasis = ASN1_NULL_new();
413 if (char_two->p.onBasis == NULL) {
414 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE);
421 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, EC_R_UNSUPPORTED_FIELD);
432 static int ec_asn1_group2curve(const EC_GROUP *group, X9_62_CURVE *curve)
435 BIGNUM *tmp_1 = NULL, *tmp_2 = NULL;
436 unsigned char *buffer_1 = NULL, *buffer_2 = NULL,
437 *a_buf = NULL, *b_buf = NULL;
439 unsigned char char_zero = 0;
441 if (!group || !curve || !curve->a || !curve->b)
444 if ((tmp_1 = BN_new()) == NULL || (tmp_2 = BN_new()) == NULL) {
445 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_MALLOC_FAILURE);
449 nid = EC_METHOD_get_field_type(EC_GROUP_method_of(group));
452 if (nid == NID_X9_62_prime_field) {
453 if (!EC_GROUP_get_curve_GFp(group, NULL, tmp_1, tmp_2, NULL)) {
454 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_EC_LIB);
458 #ifndef OPENSSL_NO_EC2M
459 else { /* nid == NID_X9_62_characteristic_two_field */
461 if (!EC_GROUP_get_curve_GF2m(group, NULL, tmp_1, tmp_2, NULL)) {
462 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_EC_LIB);
467 len_1 = (size_t)BN_num_bytes(tmp_1);
468 len_2 = (size_t)BN_num_bytes(tmp_2);
471 /* len_1 == 0 => a == 0 */
475 if ((buffer_1 = OPENSSL_malloc(len_1)) == NULL) {
476 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_MALLOC_FAILURE);
479 if ((len_1 = BN_bn2bin(tmp_1, buffer_1)) == 0) {
480 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_BN_LIB);
487 /* len_2 == 0 => b == 0 */
491 if ((buffer_2 = OPENSSL_malloc(len_2)) == NULL) {
492 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_MALLOC_FAILURE);
495 if ((len_2 = BN_bn2bin(tmp_2, buffer_2)) == 0) {
496 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_BN_LIB);
503 if (!ASN1_OCTET_STRING_set(curve->a, a_buf, len_1) ||
504 !ASN1_OCTET_STRING_set(curve->b, b_buf, len_2)) {
505 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_ASN1_LIB);
509 /* set the seed (optional) */
512 if ((curve->seed = ASN1_BIT_STRING_new()) == NULL) {
513 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_MALLOC_FAILURE);
516 curve->seed->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07);
517 curve->seed->flags |= ASN1_STRING_FLAG_BITS_LEFT;
518 if (!ASN1_BIT_STRING_set(curve->seed, group->seed,
519 (int)group->seed_len)) {
520 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_ASN1_LIB);
524 ASN1_BIT_STRING_free(curve->seed);
531 OPENSSL_free(buffer_1);
532 OPENSSL_free(buffer_2);
538 static ECPARAMETERS *ec_asn1_group2parameters(const EC_GROUP *group,
542 ECPARAMETERS *ret = NULL;
544 unsigned char *buffer = NULL;
545 const EC_POINT *point = NULL;
546 point_conversion_form_t form;
549 if ((ret = ECPARAMETERS_new()) == NULL) {
550 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_MALLOC_FAILURE);
556 /* set the version (always one) */
557 ret->version = (long)0x1;
559 /* set the fieldID */
560 if (!ec_asn1_group2fieldid(group, ret->fieldID)) {
561 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_EC_LIB);
566 if (!ec_asn1_group2curve(group, ret->curve)) {
567 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_EC_LIB);
571 /* set the base point */
572 if ((point = EC_GROUP_get0_generator(group)) == NULL) {
573 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, EC_R_UNDEFINED_GENERATOR);
577 form = EC_GROUP_get_point_conversion_form(group);
579 len = EC_POINT_point2buf(group, point, form, &buffer, NULL);
581 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_EC_LIB);
584 if (ret->base == NULL && (ret->base = ASN1_OCTET_STRING_new()) == NULL) {
585 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_MALLOC_FAILURE);
588 if (!ASN1_OCTET_STRING_set(ret->base, buffer, len)) {
589 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_ASN1_LIB);
594 tmp = EC_GROUP_get0_order(group);
596 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_EC_LIB);
599 ret->order = BN_to_ASN1_INTEGER(tmp, ret->order);
600 if (ret->order == NULL) {
601 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_ASN1_LIB);
605 /* set the cofactor (optional) */
606 tmp = EC_GROUP_get0_cofactor(group);
608 ret->cofactor = BN_to_ASN1_INTEGER(tmp, ret->cofactor);
609 if (ret->cofactor == NULL) {
610 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_ASN1_LIB);
619 ECPARAMETERS_free(ret);
620 OPENSSL_free(buffer);
624 ECPKPARAMETERS *ec_asn1_group2pkparameters(const EC_GROUP *group,
625 ECPKPARAMETERS *params)
628 ECPKPARAMETERS *ret = params;
631 if ((ret = ECPKPARAMETERS_new()) == NULL) {
632 ECerr(EC_F_EC_ASN1_GROUP2PKPARAMETERS, ERR_R_MALLOC_FAILURE);
637 ASN1_OBJECT_free(ret->value.named_curve);
638 else if (ret->type == 1 && ret->value.parameters)
639 ECPARAMETERS_free(ret->value.parameters);
642 if (EC_GROUP_get_asn1_flag(group)) {
644 * use the asn1 OID to describe the the elliptic curve parameters
646 tmp = EC_GROUP_get_curve_name(group);
649 if ((ret->value.named_curve = OBJ_nid2obj(tmp)) == NULL)
652 /* we don't know the nid => ERROR */
655 /* use the ECPARAMETERS structure */
657 if ((ret->value.parameters =
658 ec_asn1_group2parameters(group, NULL)) == NULL)
663 ECPKPARAMETERS_free(ret);
669 static EC_GROUP *ec_asn1_parameters2group(const ECPARAMETERS *params)
672 EC_GROUP *ret = NULL;
673 BIGNUM *p = NULL, *a = NULL, *b = NULL;
674 EC_POINT *point = NULL;
677 if (!params->fieldID || !params->fieldID->fieldType ||
678 !params->fieldID->p.ptr) {
679 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_ASN1_ERROR);
683 /* now extract the curve parameters a and b */
684 if (!params->curve || !params->curve->a ||
685 !params->curve->a->data || !params->curve->b ||
686 !params->curve->b->data) {
687 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_ASN1_ERROR);
690 a = BN_bin2bn(params->curve->a->data, params->curve->a->length, NULL);
692 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_BN_LIB);
695 b = BN_bin2bn(params->curve->b->data, params->curve->b->length, NULL);
697 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_BN_LIB);
701 /* get the field parameters */
702 tmp = OBJ_obj2nid(params->fieldID->fieldType);
703 if (tmp == NID_X9_62_characteristic_two_field)
704 #ifdef OPENSSL_NO_EC2M
706 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_GF2M_NOT_SUPPORTED);
711 X9_62_CHARACTERISTIC_TWO *char_two;
713 char_two = params->fieldID->p.char_two;
715 field_bits = char_two->m;
716 if (field_bits > OPENSSL_ECC_MAX_FIELD_BITS) {
717 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_FIELD_TOO_LARGE);
721 if ((p = BN_new()) == NULL) {
722 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_MALLOC_FAILURE);
726 /* get the base type */
727 tmp = OBJ_obj2nid(char_two->type);
729 if (tmp == NID_X9_62_tpBasis) {
732 if (!char_two->p.tpBasis) {
733 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_ASN1_ERROR);
737 tmp_long = ASN1_INTEGER_get(char_two->p.tpBasis);
739 if (!(char_two->m > tmp_long && tmp_long > 0)) {
740 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP,
741 EC_R_INVALID_TRINOMIAL_BASIS);
745 /* create the polynomial */
746 if (!BN_set_bit(p, (int)char_two->m))
748 if (!BN_set_bit(p, (int)tmp_long))
750 if (!BN_set_bit(p, 0))
752 } else if (tmp == NID_X9_62_ppBasis) {
753 X9_62_PENTANOMIAL *penta;
755 penta = char_two->p.ppBasis;
757 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_ASN1_ERROR);
762 (char_two->m > penta->k3 && penta->k3 > penta->k2
763 && penta->k2 > penta->k1 && penta->k1 > 0)) {
764 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP,
765 EC_R_INVALID_PENTANOMIAL_BASIS);
769 /* create the polynomial */
770 if (!BN_set_bit(p, (int)char_two->m))
772 if (!BN_set_bit(p, (int)penta->k1))
774 if (!BN_set_bit(p, (int)penta->k2))
776 if (!BN_set_bit(p, (int)penta->k3))
778 if (!BN_set_bit(p, 0))
780 } else if (tmp == NID_X9_62_onBasis) {
781 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_NOT_IMPLEMENTED);
785 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_ASN1_ERROR);
789 /* create the EC_GROUP structure */
790 ret = EC_GROUP_new_curve_GF2m(p, a, b, NULL);
793 else if (tmp == NID_X9_62_prime_field) {
794 /* we have a curve over a prime field */
795 /* extract the prime number */
796 if (!params->fieldID->p.prime) {
797 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_ASN1_ERROR);
800 p = ASN1_INTEGER_to_BN(params->fieldID->p.prime, NULL);
802 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_ASN1_LIB);
806 if (BN_is_negative(p) || BN_is_zero(p)) {
807 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_INVALID_FIELD);
811 field_bits = BN_num_bits(p);
812 if (field_bits > OPENSSL_ECC_MAX_FIELD_BITS) {
813 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_FIELD_TOO_LARGE);
817 /* create the EC_GROUP structure */
818 ret = EC_GROUP_new_curve_GFp(p, a, b, NULL);
820 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_INVALID_FIELD);
825 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_EC_LIB);
829 /* extract seed (optional) */
830 if (params->curve->seed != NULL) {
831 OPENSSL_free(ret->seed);
832 if ((ret->seed = OPENSSL_malloc(params->curve->seed->length)) == NULL) {
833 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_MALLOC_FAILURE);
836 memcpy(ret->seed, params->curve->seed->data,
837 params->curve->seed->length);
838 ret->seed_len = params->curve->seed->length;
841 if (!params->order || !params->base || !params->base->data) {
842 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_ASN1_ERROR);
846 if ((point = EC_POINT_new(ret)) == NULL)
849 /* set the point conversion form */
850 EC_GROUP_set_point_conversion_form(ret, (point_conversion_form_t)
851 (params->base->data[0] & ~0x01));
853 /* extract the ec point */
854 if (!EC_POINT_oct2point(ret, point, params->base->data,
855 params->base->length, NULL)) {
856 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_EC_LIB);
860 /* extract the order */
861 if ((a = ASN1_INTEGER_to_BN(params->order, a)) == NULL) {
862 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_ASN1_LIB);
865 if (BN_is_negative(a) || BN_is_zero(a)) {
866 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_INVALID_GROUP_ORDER);
869 if (BN_num_bits(a) > (int)field_bits + 1) { /* Hasse bound */
870 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_INVALID_GROUP_ORDER);
874 /* extract the cofactor (optional) */
875 if (params->cofactor == NULL) {
878 } else if ((b = ASN1_INTEGER_to_BN(params->cofactor, b)) == NULL) {
879 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_ASN1_LIB);
882 /* set the generator, order and cofactor (if present) */
883 if (!EC_GROUP_set_generator(ret, point, a, b)) {
884 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_EC_LIB);
892 EC_GROUP_clear_free(ret);
899 EC_POINT_free(point);
903 EC_GROUP *ec_asn1_pkparameters2group(const ECPKPARAMETERS *params)
905 EC_GROUP *ret = NULL;
908 if (params == NULL) {
909 ECerr(EC_F_EC_ASN1_PKPARAMETERS2GROUP, EC_R_MISSING_PARAMETERS);
913 if (params->type == 0) { /* the curve is given by an OID */
914 tmp = OBJ_obj2nid(params->value.named_curve);
915 if ((ret = EC_GROUP_new_by_curve_name(tmp)) == NULL) {
916 ECerr(EC_F_EC_ASN1_PKPARAMETERS2GROUP,
917 EC_R_EC_GROUP_NEW_BY_NAME_FAILURE);
920 EC_GROUP_set_asn1_flag(ret, OPENSSL_EC_NAMED_CURVE);
921 } else if (params->type == 1) { /* the parameters are given by a
922 * ECPARAMETERS structure */
923 ret = ec_asn1_parameters2group(params->value.parameters);
925 ECerr(EC_F_EC_ASN1_PKPARAMETERS2GROUP, ERR_R_EC_LIB);
928 EC_GROUP_set_asn1_flag(ret, 0x0);
929 } else if (params->type == 2) { /* implicitlyCA */
932 ECerr(EC_F_EC_ASN1_PKPARAMETERS2GROUP, EC_R_ASN1_ERROR);
939 /* EC_GROUP <-> DER encoding of ECPKPARAMETERS */
941 EC_GROUP *d2i_ECPKParameters(EC_GROUP **a, const unsigned char **in, long len)
943 EC_GROUP *group = NULL;
944 ECPKPARAMETERS *params = NULL;
945 const unsigned char *p = *in;
947 if ((params = d2i_ECPKPARAMETERS(NULL, &p, len)) == NULL) {
948 ECerr(EC_F_D2I_ECPKPARAMETERS, EC_R_D2I_ECPKPARAMETERS_FAILURE);
949 ECPKPARAMETERS_free(params);
953 if ((group = ec_asn1_pkparameters2group(params)) == NULL) {
954 ECerr(EC_F_D2I_ECPKPARAMETERS, EC_R_PKPARAMETERS2GROUP_FAILURE);
955 ECPKPARAMETERS_free(params);
960 EC_GROUP_clear_free(*a);
964 ECPKPARAMETERS_free(params);
969 int i2d_ECPKParameters(const EC_GROUP *a, unsigned char **out)
972 ECPKPARAMETERS *tmp = ec_asn1_group2pkparameters(a, NULL);
974 ECerr(EC_F_I2D_ECPKPARAMETERS, EC_R_GROUP2PKPARAMETERS_FAILURE);
977 if ((ret = i2d_ECPKPARAMETERS(tmp, out)) == 0) {
978 ECerr(EC_F_I2D_ECPKPARAMETERS, EC_R_I2D_ECPKPARAMETERS_FAILURE);
979 ECPKPARAMETERS_free(tmp);
982 ECPKPARAMETERS_free(tmp);
986 /* some EC_KEY functions */
988 EC_KEY *d2i_ECPrivateKey(EC_KEY **a, const unsigned char **in, long len)
991 EC_PRIVATEKEY *priv_key = NULL;
992 const unsigned char *p = *in;
994 if ((priv_key = d2i_EC_PRIVATEKEY(NULL, &p, len)) == NULL) {
995 ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_EC_LIB);
999 if (a == NULL || *a == NULL) {
1000 if ((ret = EC_KEY_new()) == NULL) {
1001 ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_MALLOC_FAILURE);
1007 if (priv_key->parameters) {
1008 EC_GROUP_clear_free(ret->group);
1009 ret->group = ec_asn1_pkparameters2group(priv_key->parameters);
1012 if (ret->group == NULL) {
1013 ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_EC_LIB);
1017 ret->version = priv_key->version;
1019 if (priv_key->privateKey) {
1020 ASN1_OCTET_STRING *pkey = priv_key->privateKey;
1021 if (EC_KEY_oct2priv(ret, ASN1_STRING_data(pkey),
1022 ASN1_STRING_length(pkey)) == 0)
1025 ECerr(EC_F_D2I_ECPRIVATEKEY, EC_R_MISSING_PRIVATE_KEY);
1029 EC_POINT_clear_free(ret->pub_key);
1030 ret->pub_key = EC_POINT_new(ret->group);
1031 if (ret->pub_key == NULL) {
1032 ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_EC_LIB);
1036 if (priv_key->publicKey) {
1037 const unsigned char *pub_oct;
1040 pub_oct = ASN1_STRING_data(priv_key->publicKey);
1041 pub_oct_len = ASN1_STRING_length(priv_key->publicKey);
1042 if (!EC_KEY_oct2key(ret, pub_oct, pub_oct_len, NULL)) {
1043 ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_EC_LIB);
1047 if (ret->group->meth->keygenpub == NULL
1048 || ret->group->meth->keygenpub(ret) == 0)
1050 /* Remember the original private-key-only encoding. */
1051 ret->enc_flag |= EC_PKEY_NO_PUBKEY;
1056 EC_PRIVATEKEY_free(priv_key);
1061 if (a == NULL || *a != ret)
1063 EC_PRIVATEKEY_free(priv_key);
1067 int i2d_ECPrivateKey(EC_KEY *a, unsigned char **out)
1069 int ret = 0, ok = 0;
1070 unsigned char *priv= NULL, *pub= NULL;
1071 size_t privlen = 0, publen = 0;
1073 EC_PRIVATEKEY *priv_key = NULL;
1075 if (a == NULL || a->group == NULL ||
1076 (!(a->enc_flag & EC_PKEY_NO_PUBKEY) && a->pub_key == NULL)) {
1077 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_PASSED_NULL_PARAMETER);
1081 if ((priv_key = EC_PRIVATEKEY_new()) == NULL) {
1082 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_MALLOC_FAILURE);
1086 priv_key->version = a->version;
1088 privlen = EC_KEY_priv2buf(a, &priv);
1091 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_EC_LIB);
1095 ASN1_STRING_set0(priv_key->privateKey, priv, privlen);
1098 if (!(a->enc_flag & EC_PKEY_NO_PARAMETERS)) {
1099 if ((priv_key->parameters =
1100 ec_asn1_group2pkparameters(a->group,
1101 priv_key->parameters)) == NULL) {
1102 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_EC_LIB);
1107 if (!(a->enc_flag & EC_PKEY_NO_PUBKEY)) {
1108 priv_key->publicKey = ASN1_BIT_STRING_new();
1109 if (priv_key->publicKey == NULL) {
1110 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_MALLOC_FAILURE);
1114 publen = EC_KEY_key2buf(a, a->conv_form, &pub, NULL);
1117 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_EC_LIB);
1121 priv_key->publicKey->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07);
1122 priv_key->publicKey->flags |= ASN1_STRING_FLAG_BITS_LEFT;
1123 ASN1_STRING_set0(priv_key->publicKey, pub, publen);
1127 if ((ret = i2d_EC_PRIVATEKEY(priv_key, out)) == 0) {
1128 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_EC_LIB);
1133 OPENSSL_clear_free(priv, privlen);
1135 EC_PRIVATEKEY_free(priv_key);
1136 return (ok ? ret : 0);
1139 int i2d_ECParameters(EC_KEY *a, unsigned char **out)
1142 ECerr(EC_F_I2D_ECPARAMETERS, ERR_R_PASSED_NULL_PARAMETER);
1145 return i2d_ECPKParameters(a->group, out);
1148 EC_KEY *d2i_ECParameters(EC_KEY **a, const unsigned char **in, long len)
1152 if (in == NULL || *in == NULL) {
1153 ECerr(EC_F_D2I_ECPARAMETERS, ERR_R_PASSED_NULL_PARAMETER);
1157 if (a == NULL || *a == NULL) {
1158 if ((ret = EC_KEY_new()) == NULL) {
1159 ECerr(EC_F_D2I_ECPARAMETERS, ERR_R_MALLOC_FAILURE);
1165 if (!d2i_ECPKParameters(&ret->group, in, len)) {
1166 ECerr(EC_F_D2I_ECPARAMETERS, ERR_R_EC_LIB);
1167 if (a == NULL || *a != ret)
1178 EC_KEY *o2i_ECPublicKey(EC_KEY **a, const unsigned char **in, long len)
1182 if (a == NULL || (*a) == NULL || (*a)->group == NULL) {
1184 * sorry, but a EC_GROUP-structure is necessary to set the public key
1186 ECerr(EC_F_O2I_ECPUBLICKEY, ERR_R_PASSED_NULL_PARAMETER);
1190 if (!EC_KEY_oct2key(ret, *in, len, NULL)) {
1191 ECerr(EC_F_O2I_ECPUBLICKEY, ERR_R_EC_LIB);
1198 int i2o_ECPublicKey(EC_KEY *a, unsigned char **out)
1204 ECerr(EC_F_I2O_ECPUBLICKEY, ERR_R_PASSED_NULL_PARAMETER);
1208 buf_len = EC_POINT_point2oct(a->group, a->pub_key,
1209 a->conv_form, NULL, 0, NULL);
1211 if (out == NULL || buf_len == 0)
1212 /* out == NULL => just return the length of the octet string */
1216 if ((*out = OPENSSL_malloc(buf_len)) == NULL) {
1217 ECerr(EC_F_I2O_ECPUBLICKEY, ERR_R_MALLOC_FAILURE);
1222 if (!EC_POINT_point2oct(a->group, a->pub_key, a->conv_form,
1223 *out, buf_len, NULL)) {
1224 ECerr(EC_F_I2O_ECPUBLICKEY, ERR_R_EC_LIB);
1236 ASN1_SEQUENCE(ECDSA_SIG) = {
1237 ASN1_SIMPLE(ECDSA_SIG, r, CBIGNUM),
1238 ASN1_SIMPLE(ECDSA_SIG, s, CBIGNUM)
1239 } static_ASN1_SEQUENCE_END(ECDSA_SIG)
1241 DECLARE_ASN1_FUNCTIONS_const(ECDSA_SIG)
1242 DECLARE_ASN1_ENCODE_FUNCTIONS_const(ECDSA_SIG, ECDSA_SIG)
1243 IMPLEMENT_ASN1_FUNCTIONS_const(ECDSA_SIG)
1245 void ECDSA_SIG_get0(BIGNUM **pr, BIGNUM **ps, ECDSA_SIG *sig)
1253 int ECDSA_size(const EC_KEY *r)
1257 unsigned char buf[4];
1258 const EC_GROUP *group;
1262 group = EC_KEY_get0_group(r);
1266 i = EC_GROUP_order_bits(group);
1269 bs.length = (i + 7) / 8;
1271 bs.type = V_ASN1_INTEGER;
1272 /* If the top bit is set the asn1 encoding is 1 larger. */
1275 i = i2d_ASN1_INTEGER(&bs, NULL);
1276 i += i; /* r and s */
1277 ret = ASN1_object_size(1, i, V_ASN1_SEQUENCE);