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 /* 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);
428 static int ec_asn1_group2curve(const EC_GROUP *group, X9_62_CURVE *curve)
431 BIGNUM *tmp_1 = NULL, *tmp_2 = NULL;
432 unsigned char *buffer_1 = NULL, *buffer_2 = NULL,
433 *a_buf = NULL, *b_buf = NULL;
435 unsigned char char_zero = 0;
437 if (!group || !curve || !curve->a || !curve->b)
440 if ((tmp_1 = BN_new()) == NULL || (tmp_2 = BN_new()) == NULL) {
441 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_MALLOC_FAILURE);
445 nid = EC_METHOD_get_field_type(EC_GROUP_method_of(group));
448 if (nid == NID_X9_62_prime_field) {
449 if (!EC_GROUP_get_curve_GFp(group, NULL, tmp_1, tmp_2, NULL)) {
450 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_EC_LIB);
454 #ifndef OPENSSL_NO_EC2M
455 else { /* nid == NID_X9_62_characteristic_two_field */
457 if (!EC_GROUP_get_curve_GF2m(group, NULL, tmp_1, tmp_2, NULL)) {
458 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_EC_LIB);
463 len_1 = (size_t)BN_num_bytes(tmp_1);
464 len_2 = (size_t)BN_num_bytes(tmp_2);
467 /* len_1 == 0 => a == 0 */
471 if ((buffer_1 = OPENSSL_malloc(len_1)) == NULL) {
472 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_MALLOC_FAILURE);
475 if ((len_1 = BN_bn2bin(tmp_1, buffer_1)) == 0) {
476 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_BN_LIB);
483 /* len_2 == 0 => b == 0 */
487 if ((buffer_2 = OPENSSL_malloc(len_2)) == NULL) {
488 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_MALLOC_FAILURE);
491 if ((len_2 = BN_bn2bin(tmp_2, buffer_2)) == 0) {
492 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_BN_LIB);
499 if (!ASN1_OCTET_STRING_set(curve->a, a_buf, len_1) ||
500 !ASN1_OCTET_STRING_set(curve->b, b_buf, len_2)) {
501 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_ASN1_LIB);
505 /* set the seed (optional) */
508 if ((curve->seed = ASN1_BIT_STRING_new()) == NULL) {
509 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_MALLOC_FAILURE);
512 curve->seed->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07);
513 curve->seed->flags |= ASN1_STRING_FLAG_BITS_LEFT;
514 if (!ASN1_BIT_STRING_set(curve->seed, group->seed,
515 (int)group->seed_len)) {
516 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_ASN1_LIB);
520 ASN1_BIT_STRING_free(curve->seed);
527 OPENSSL_free(buffer_1);
528 OPENSSL_free(buffer_2);
534 static ECPARAMETERS *ec_asn1_group2parameters(const EC_GROUP *group,
538 ECPARAMETERS *ret = NULL;
540 unsigned char *buffer = NULL;
541 const EC_POINT *point = NULL;
542 point_conversion_form_t form;
545 if ((ret = ECPARAMETERS_new()) == NULL) {
546 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_MALLOC_FAILURE);
552 /* set the version (always one) */
553 ret->version = (long)0x1;
555 /* set the fieldID */
556 if (!ec_asn1_group2fieldid(group, ret->fieldID)) {
557 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_EC_LIB);
562 if (!ec_asn1_group2curve(group, ret->curve)) {
563 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_EC_LIB);
567 /* set the base point */
568 if ((point = EC_GROUP_get0_generator(group)) == NULL) {
569 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, EC_R_UNDEFINED_GENERATOR);
573 form = EC_GROUP_get_point_conversion_form(group);
575 len = EC_POINT_point2buf(group, point, form, &buffer, NULL);
577 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_EC_LIB);
580 if (ret->base == NULL && (ret->base = ASN1_OCTET_STRING_new()) == NULL) {
581 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_MALLOC_FAILURE);
584 if (!ASN1_OCTET_STRING_set(ret->base, buffer, len)) {
585 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_ASN1_LIB);
590 tmp = EC_GROUP_get0_order(group);
592 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_EC_LIB);
595 ret->order = BN_to_ASN1_INTEGER(tmp, ret->order);
596 if (ret->order == NULL) {
597 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_ASN1_LIB);
601 /* set the cofactor (optional) */
602 tmp = EC_GROUP_get0_cofactor(group);
604 ret->cofactor = BN_to_ASN1_INTEGER(tmp, ret->cofactor);
605 if (ret->cofactor == NULL) {
606 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_ASN1_LIB);
615 ECPARAMETERS_free(ret);
616 OPENSSL_free(buffer);
620 ECPKPARAMETERS *ec_asn1_group2pkparameters(const EC_GROUP *group,
621 ECPKPARAMETERS *params)
624 ECPKPARAMETERS *ret = params;
627 if ((ret = ECPKPARAMETERS_new()) == NULL) {
628 ECerr(EC_F_EC_ASN1_GROUP2PKPARAMETERS, ERR_R_MALLOC_FAILURE);
633 ASN1_OBJECT_free(ret->value.named_curve);
634 else if (ret->type == 1 && ret->value.parameters)
635 ECPARAMETERS_free(ret->value.parameters);
638 if (EC_GROUP_get_asn1_flag(group)) {
640 * use the asn1 OID to describe the the elliptic curve parameters
642 tmp = EC_GROUP_get_curve_name(group);
645 if ((ret->value.named_curve = OBJ_nid2obj(tmp)) == NULL)
648 /* we don't kmow the nid => ERROR */
651 /* use the ECPARAMETERS structure */
653 if ((ret->value.parameters =
654 ec_asn1_group2parameters(group, NULL)) == NULL)
659 ECPKPARAMETERS_free(ret);
665 static EC_GROUP *ec_asn1_parameters2group(const ECPARAMETERS *params)
668 EC_GROUP *ret = NULL;
669 BIGNUM *p = NULL, *a = NULL, *b = NULL;
670 EC_POINT *point = NULL;
673 if (!params->fieldID || !params->fieldID->fieldType ||
674 !params->fieldID->p.ptr) {
675 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_ASN1_ERROR);
679 /* now extract the curve parameters a and b */
680 if (!params->curve || !params->curve->a ||
681 !params->curve->a->data || !params->curve->b ||
682 !params->curve->b->data) {
683 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_ASN1_ERROR);
686 a = BN_bin2bn(params->curve->a->data, params->curve->a->length, NULL);
688 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_BN_LIB);
691 b = BN_bin2bn(params->curve->b->data, params->curve->b->length, NULL);
693 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_BN_LIB);
697 /* get the field parameters */
698 tmp = OBJ_obj2nid(params->fieldID->fieldType);
699 if (tmp == NID_X9_62_characteristic_two_field)
700 #ifdef OPENSSL_NO_EC2M
702 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_GF2M_NOT_SUPPORTED);
707 X9_62_CHARACTERISTIC_TWO *char_two;
709 char_two = params->fieldID->p.char_two;
711 field_bits = char_two->m;
712 if (field_bits > OPENSSL_ECC_MAX_FIELD_BITS) {
713 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_FIELD_TOO_LARGE);
717 if ((p = BN_new()) == NULL) {
718 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_MALLOC_FAILURE);
722 /* get the base type */
723 tmp = OBJ_obj2nid(char_two->type);
725 if (tmp == NID_X9_62_tpBasis) {
728 if (!char_two->p.tpBasis) {
729 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_ASN1_ERROR);
733 tmp_long = ASN1_INTEGER_get(char_two->p.tpBasis);
735 if (!(char_two->m > tmp_long && tmp_long > 0)) {
736 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP,
737 EC_R_INVALID_TRINOMIAL_BASIS);
741 /* create the polynomial */
742 if (!BN_set_bit(p, (int)char_two->m))
744 if (!BN_set_bit(p, (int)tmp_long))
746 if (!BN_set_bit(p, 0))
748 } else if (tmp == NID_X9_62_ppBasis) {
749 X9_62_PENTANOMIAL *penta;
751 penta = char_two->p.ppBasis;
753 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_ASN1_ERROR);
758 (char_two->m > penta->k3 && penta->k3 > penta->k2
759 && penta->k2 > penta->k1 && penta->k1 > 0)) {
760 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP,
761 EC_R_INVALID_PENTANOMIAL_BASIS);
765 /* create the polynomial */
766 if (!BN_set_bit(p, (int)char_two->m))
768 if (!BN_set_bit(p, (int)penta->k1))
770 if (!BN_set_bit(p, (int)penta->k2))
772 if (!BN_set_bit(p, (int)penta->k3))
774 if (!BN_set_bit(p, 0))
776 } else if (tmp == NID_X9_62_onBasis) {
777 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_NOT_IMPLEMENTED);
781 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_ASN1_ERROR);
785 /* create the EC_GROUP structure */
786 ret = EC_GROUP_new_curve_GF2m(p, a, b, NULL);
789 else if (tmp == NID_X9_62_prime_field) {
790 /* we have a curve over a prime field */
791 /* extract the prime number */
792 if (!params->fieldID->p.prime) {
793 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_ASN1_ERROR);
796 p = ASN1_INTEGER_to_BN(params->fieldID->p.prime, NULL);
798 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_ASN1_LIB);
802 if (BN_is_negative(p) || BN_is_zero(p)) {
803 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_INVALID_FIELD);
807 field_bits = BN_num_bits(p);
808 if (field_bits > OPENSSL_ECC_MAX_FIELD_BITS) {
809 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_FIELD_TOO_LARGE);
813 /* create the EC_GROUP structure */
814 ret = EC_GROUP_new_curve_GFp(p, a, b, NULL);
816 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_INVALID_FIELD);
821 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_EC_LIB);
825 /* extract seed (optional) */
826 if (params->curve->seed != NULL) {
827 OPENSSL_free(ret->seed);
828 if ((ret->seed = OPENSSL_malloc(params->curve->seed->length)) == NULL) {
829 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_MALLOC_FAILURE);
832 memcpy(ret->seed, params->curve->seed->data,
833 params->curve->seed->length);
834 ret->seed_len = params->curve->seed->length;
837 if (!params->order || !params->base || !params->base->data) {
838 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_ASN1_ERROR);
842 if ((point = EC_POINT_new(ret)) == NULL)
845 /* set the point conversion form */
846 EC_GROUP_set_point_conversion_form(ret, (point_conversion_form_t)
847 (params->base->data[0] & ~0x01));
849 /* extract the ec point */
850 if (!EC_POINT_oct2point(ret, point, params->base->data,
851 params->base->length, NULL)) {
852 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_EC_LIB);
856 /* extract the order */
857 if ((a = ASN1_INTEGER_to_BN(params->order, a)) == NULL) {
858 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_ASN1_LIB);
861 if (BN_is_negative(a) || BN_is_zero(a)) {
862 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_INVALID_GROUP_ORDER);
865 if (BN_num_bits(a) > (int)field_bits + 1) { /* Hasse bound */
866 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_INVALID_GROUP_ORDER);
870 /* extract the cofactor (optional) */
871 if (params->cofactor == NULL) {
874 } else if ((b = ASN1_INTEGER_to_BN(params->cofactor, b)) == NULL) {
875 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_ASN1_LIB);
878 /* set the generator, order and cofactor (if present) */
879 if (!EC_GROUP_set_generator(ret, point, a, b)) {
880 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_EC_LIB);
888 EC_GROUP_clear_free(ret);
895 EC_POINT_free(point);
899 EC_GROUP *ec_asn1_pkparameters2group(const ECPKPARAMETERS *params)
901 EC_GROUP *ret = NULL;
904 if (params == NULL) {
905 ECerr(EC_F_EC_ASN1_PKPARAMETERS2GROUP, EC_R_MISSING_PARAMETERS);
909 if (params->type == 0) { /* the curve is given by an OID */
910 tmp = OBJ_obj2nid(params->value.named_curve);
911 if ((ret = EC_GROUP_new_by_curve_name(tmp)) == NULL) {
912 ECerr(EC_F_EC_ASN1_PKPARAMETERS2GROUP,
913 EC_R_EC_GROUP_NEW_BY_NAME_FAILURE);
916 EC_GROUP_set_asn1_flag(ret, OPENSSL_EC_NAMED_CURVE);
917 } else if (params->type == 1) { /* the parameters are given by a
918 * ECPARAMETERS structure */
919 ret = ec_asn1_parameters2group(params->value.parameters);
921 ECerr(EC_F_EC_ASN1_PKPARAMETERS2GROUP, ERR_R_EC_LIB);
924 EC_GROUP_set_asn1_flag(ret, 0x0);
925 } else if (params->type == 2) { /* implicitlyCA */
928 ECerr(EC_F_EC_ASN1_PKPARAMETERS2GROUP, EC_R_ASN1_ERROR);
935 /* EC_GROUP <-> DER encoding of ECPKPARAMETERS */
937 EC_GROUP *d2i_ECPKParameters(EC_GROUP **a, const unsigned char **in, long len)
939 EC_GROUP *group = NULL;
940 ECPKPARAMETERS *params = NULL;
941 const unsigned char *p = *in;
943 if ((params = d2i_ECPKPARAMETERS(NULL, &p, len)) == NULL) {
944 ECerr(EC_F_D2I_ECPKPARAMETERS, EC_R_D2I_ECPKPARAMETERS_FAILURE);
945 ECPKPARAMETERS_free(params);
949 if ((group = ec_asn1_pkparameters2group(params)) == NULL) {
950 ECerr(EC_F_D2I_ECPKPARAMETERS, EC_R_PKPARAMETERS2GROUP_FAILURE);
951 ECPKPARAMETERS_free(params);
956 EC_GROUP_clear_free(*a);
960 ECPKPARAMETERS_free(params);
965 int i2d_ECPKParameters(const EC_GROUP *a, unsigned char **out)
968 ECPKPARAMETERS *tmp = ec_asn1_group2pkparameters(a, NULL);
970 ECerr(EC_F_I2D_ECPKPARAMETERS, EC_R_GROUP2PKPARAMETERS_FAILURE);
973 if ((ret = i2d_ECPKPARAMETERS(tmp, out)) == 0) {
974 ECerr(EC_F_I2D_ECPKPARAMETERS, EC_R_I2D_ECPKPARAMETERS_FAILURE);
975 ECPKPARAMETERS_free(tmp);
978 ECPKPARAMETERS_free(tmp);
982 /* some EC_KEY functions */
984 EC_KEY *d2i_ECPrivateKey(EC_KEY **a, const unsigned char **in, long len)
987 EC_PRIVATEKEY *priv_key = NULL;
988 const unsigned char *p = *in;
990 if ((priv_key = d2i_EC_PRIVATEKEY(NULL, &p, len)) == NULL) {
991 ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_EC_LIB);
995 if (a == NULL || *a == NULL) {
996 if ((ret = EC_KEY_new()) == NULL) {
997 ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_MALLOC_FAILURE);
1003 if (priv_key->parameters) {
1004 EC_GROUP_clear_free(ret->group);
1005 ret->group = ec_asn1_pkparameters2group(priv_key->parameters);
1008 if (ret->group == NULL) {
1009 ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_EC_LIB);
1013 ret->version = priv_key->version;
1015 if (priv_key->privateKey) {
1016 ASN1_OCTET_STRING *pkey = priv_key->privateKey;
1017 if (EC_KEY_oct2priv(ret, ASN1_STRING_data(pkey),
1018 ASN1_STRING_length(pkey)) == 0)
1021 ECerr(EC_F_D2I_ECPRIVATEKEY, EC_R_MISSING_PRIVATE_KEY);
1025 EC_POINT_clear_free(ret->pub_key);
1026 ret->pub_key = EC_POINT_new(ret->group);
1027 if (ret->pub_key == NULL) {
1028 ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_EC_LIB);
1032 if (priv_key->publicKey) {
1033 const unsigned char *pub_oct;
1036 pub_oct = ASN1_STRING_data(priv_key->publicKey);
1037 pub_oct_len = ASN1_STRING_length(priv_key->publicKey);
1039 * The first byte - point conversion form - must be present.
1041 if (pub_oct_len <= 0) {
1042 ECerr(EC_F_D2I_ECPRIVATEKEY, EC_R_BUFFER_TOO_SMALL);
1045 /* Save the point conversion form. */
1046 ret->conv_form = (point_conversion_form_t) (pub_oct[0] & ~0x01);
1047 if (!EC_POINT_oct2point(ret->group, ret->pub_key,
1048 pub_oct, (size_t)(pub_oct_len), NULL)) {
1049 ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_EC_LIB);
1054 (ret->group, ret->pub_key, ret->priv_key, NULL, NULL, NULL)) {
1055 ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_EC_LIB);
1058 /* Remember the original private-key-only encoding. */
1059 ret->enc_flag |= EC_PKEY_NO_PUBKEY;
1064 EC_PRIVATEKEY_free(priv_key);
1069 if (a == NULL || *a != ret)
1071 EC_PRIVATEKEY_free(priv_key);
1075 int i2d_ECPrivateKey(EC_KEY *a, unsigned char **out)
1077 int ret = 0, ok = 0;
1078 unsigned char *priv= NULL, *pub= NULL;
1079 size_t privlen, publen;
1081 EC_PRIVATEKEY *priv_key = NULL;
1083 if (a == NULL || a->group == NULL ||
1084 (!(a->enc_flag & EC_PKEY_NO_PUBKEY) && a->pub_key == NULL)) {
1085 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_PASSED_NULL_PARAMETER);
1089 if ((priv_key = EC_PRIVATEKEY_new()) == NULL) {
1090 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_MALLOC_FAILURE);
1094 priv_key->version = a->version;
1096 privlen = EC_KEY_priv2buf(a, &priv);
1099 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_EC_LIB);
1103 ASN1_STRING_set0(priv_key->privateKey, priv, privlen);
1106 if (!(a->enc_flag & EC_PKEY_NO_PARAMETERS)) {
1107 if ((priv_key->parameters =
1108 ec_asn1_group2pkparameters(a->group,
1109 priv_key->parameters)) == NULL) {
1110 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_EC_LIB);
1115 if (!(a->enc_flag & EC_PKEY_NO_PUBKEY)) {
1116 priv_key->publicKey = ASN1_BIT_STRING_new();
1117 if (priv_key->publicKey == NULL) {
1118 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_MALLOC_FAILURE);
1122 publen = EC_KEY_key2buf(a, a->conv_form, &pub, NULL);
1125 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_EC_LIB);
1129 priv_key->publicKey->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07);
1130 priv_key->publicKey->flags |= ASN1_STRING_FLAG_BITS_LEFT;
1131 ASN1_STRING_set0(priv_key->publicKey, pub, publen);
1135 if ((ret = i2d_EC_PRIVATEKEY(priv_key, out)) == 0) {
1136 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_EC_LIB);
1141 OPENSSL_clear_free(priv, privlen);
1143 EC_PRIVATEKEY_free(priv_key);
1144 return (ok ? ret : 0);
1147 int i2d_ECParameters(EC_KEY *a, unsigned char **out)
1150 ECerr(EC_F_I2D_ECPARAMETERS, ERR_R_PASSED_NULL_PARAMETER);
1153 return i2d_ECPKParameters(a->group, out);
1156 EC_KEY *d2i_ECParameters(EC_KEY **a, const unsigned char **in, long len)
1160 if (in == NULL || *in == NULL) {
1161 ECerr(EC_F_D2I_ECPARAMETERS, ERR_R_PASSED_NULL_PARAMETER);
1165 if (a == NULL || *a == NULL) {
1166 if ((ret = EC_KEY_new()) == NULL) {
1167 ECerr(EC_F_D2I_ECPARAMETERS, ERR_R_MALLOC_FAILURE);
1173 if (!d2i_ECPKParameters(&ret->group, in, len)) {
1174 ECerr(EC_F_D2I_ECPARAMETERS, ERR_R_EC_LIB);
1175 if (a == NULL || *a != ret)
1186 EC_KEY *o2i_ECPublicKey(EC_KEY **a, const unsigned char **in, long len)
1190 if (a == NULL || (*a) == NULL || (*a)->group == NULL) {
1192 * sorry, but a EC_GROUP-structur is necessary to set the public key
1194 ECerr(EC_F_O2I_ECPUBLICKEY, ERR_R_PASSED_NULL_PARAMETER);
1198 if (ret->pub_key == NULL &&
1199 (ret->pub_key = EC_POINT_new(ret->group)) == NULL) {
1200 ECerr(EC_F_O2I_ECPUBLICKEY, ERR_R_MALLOC_FAILURE);
1203 if (!EC_POINT_oct2point(ret->group, ret->pub_key, *in, len, NULL)) {
1204 ECerr(EC_F_O2I_ECPUBLICKEY, ERR_R_EC_LIB);
1207 /* save the point conversion form */
1208 ret->conv_form = (point_conversion_form_t) (*in[0] & ~0x01);
1213 int i2o_ECPublicKey(EC_KEY *a, unsigned char **out)
1219 ECerr(EC_F_I2O_ECPUBLICKEY, ERR_R_PASSED_NULL_PARAMETER);
1223 buf_len = EC_POINT_point2oct(a->group, a->pub_key,
1224 a->conv_form, NULL, 0, NULL);
1226 if (out == NULL || buf_len == 0)
1227 /* out == NULL => just return the length of the octet string */
1231 if ((*out = OPENSSL_malloc(buf_len)) == NULL) {
1232 ECerr(EC_F_I2O_ECPUBLICKEY, ERR_R_MALLOC_FAILURE);
1237 if (!EC_POINT_point2oct(a->group, a->pub_key, a->conv_form,
1238 *out, buf_len, NULL)) {
1239 ECerr(EC_F_I2O_ECPUBLICKEY, ERR_R_EC_LIB);
1251 ASN1_SEQUENCE(ECDSA_SIG) = {
1252 ASN1_SIMPLE(ECDSA_SIG, r, CBIGNUM),
1253 ASN1_SIMPLE(ECDSA_SIG, s, CBIGNUM)
1254 } static_ASN1_SEQUENCE_END(ECDSA_SIG)
1256 DECLARE_ASN1_FUNCTIONS_const(ECDSA_SIG)
1257 DECLARE_ASN1_ENCODE_FUNCTIONS_const(ECDSA_SIG, ECDSA_SIG)
1258 IMPLEMENT_ASN1_FUNCTIONS_const(ECDSA_SIG)
1260 void ECDSA_SIG_get0(BIGNUM **pr, BIGNUM **ps, ECDSA_SIG *sig)
1268 int ECDSA_size(const EC_KEY *r)
1272 unsigned char buf[4];
1273 const EC_GROUP *group;
1277 group = EC_KEY_get0_group(r);
1281 i = EC_GROUP_order_bits(group);
1284 bs.length = (i + 7) / 8;
1286 bs.type = V_ASN1_INTEGER;
1287 /* If the top bit is set the asn1 encoding is 1 larger. */
1290 i = i2d_ASN1_INTEGER(&bs, NULL);
1291 i += i; /* r and s */
1292 ret = ASN1_object_size(1, i, V_ASN1_SEQUENCE);