2 * Copyright 2002-2016 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the OpenSSL license (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
12 #include <openssl/err.h>
13 #include <openssl/asn1t.h>
14 #include <openssl/objects.h>
16 int EC_GROUP_get_basis_type(const EC_GROUP *group)
20 if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
21 NID_X9_62_characteristic_two_field)
22 /* everything else is currently not supported */
25 /* Find the last non-zero element of group->poly[] */
27 i < (int)OSSL_NELEM(group->poly) && group->poly[i] != 0;
32 return NID_X9_62_ppBasis;
34 return NID_X9_62_tpBasis;
36 /* everything else is currently not supported */
40 #ifndef OPENSSL_NO_EC2M
41 int EC_GROUP_get_trinomial_basis(const EC_GROUP *group, unsigned int *k)
46 if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
47 NID_X9_62_characteristic_two_field
48 || !((group->poly[0] != 0) && (group->poly[1] != 0)
49 && (group->poly[2] == 0))) {
50 ECerr(EC_F_EC_GROUP_GET_TRINOMIAL_BASIS,
51 ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
61 int EC_GROUP_get_pentanomial_basis(const EC_GROUP *group, unsigned int *k1,
62 unsigned int *k2, unsigned int *k3)
67 if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
68 NID_X9_62_characteristic_two_field
69 || !((group->poly[0] != 0) && (group->poly[1] != 0)
70 && (group->poly[2] != 0) && (group->poly[3] != 0)
71 && (group->poly[4] == 0))) {
72 ECerr(EC_F_EC_GROUP_GET_PENTANOMIAL_BASIS,
73 ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
88 /* some structures needed for the asn1 encoding */
89 typedef struct x9_62_pentanomial_st {
95 typedef struct x9_62_characteristic_two_st {
100 /* NID_X9_62_onBasis */
102 /* NID_X9_62_tpBasis */
103 ASN1_INTEGER *tpBasis;
104 /* NID_X9_62_ppBasis */
105 X9_62_PENTANOMIAL *ppBasis;
109 } X9_62_CHARACTERISTIC_TWO;
111 typedef struct x9_62_fieldid_st {
112 ASN1_OBJECT *fieldType;
115 /* NID_X9_62_prime_field */
117 /* NID_X9_62_characteristic_two_field */
118 X9_62_CHARACTERISTIC_TWO *char_two;
124 typedef struct x9_62_curve_st {
125 ASN1_OCTET_STRING *a;
126 ASN1_OCTET_STRING *b;
127 ASN1_BIT_STRING *seed;
130 struct ec_parameters_st {
132 X9_62_FIELDID *fieldID;
134 ASN1_OCTET_STRING *base;
136 ASN1_INTEGER *cofactor;
137 } /* ECPARAMETERS */ ;
139 struct ecpk_parameters_st {
142 ASN1_OBJECT *named_curve;
143 ECPARAMETERS *parameters;
144 ASN1_NULL *implicitlyCA;
146 } /* ECPKPARAMETERS */ ;
148 /* SEC1 ECPrivateKey */
149 typedef struct ec_privatekey_st {
151 ASN1_OCTET_STRING *privateKey;
152 ECPKPARAMETERS *parameters;
153 ASN1_BIT_STRING *publicKey;
156 /* the OpenSSL ASN.1 definitions */
157 ASN1_SEQUENCE(X9_62_PENTANOMIAL) = {
158 ASN1_EMBED(X9_62_PENTANOMIAL, k1, INT32),
159 ASN1_EMBED(X9_62_PENTANOMIAL, k2, INT32),
160 ASN1_EMBED(X9_62_PENTANOMIAL, k3, INT32)
161 } static_ASN1_SEQUENCE_END(X9_62_PENTANOMIAL)
163 DECLARE_ASN1_ALLOC_FUNCTIONS(X9_62_PENTANOMIAL)
164 IMPLEMENT_ASN1_ALLOC_FUNCTIONS(X9_62_PENTANOMIAL)
166 ASN1_ADB_TEMPLATE(char_two_def) = ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, p.other, ASN1_ANY);
168 ASN1_ADB(X9_62_CHARACTERISTIC_TWO) = {
169 ADB_ENTRY(NID_X9_62_onBasis, ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, p.onBasis, ASN1_NULL)),
170 ADB_ENTRY(NID_X9_62_tpBasis, ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, p.tpBasis, ASN1_INTEGER)),
171 ADB_ENTRY(NID_X9_62_ppBasis, ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, p.ppBasis, X9_62_PENTANOMIAL))
172 } ASN1_ADB_END(X9_62_CHARACTERISTIC_TWO, 0, type, 0, &char_two_def_tt, NULL);
174 ASN1_SEQUENCE(X9_62_CHARACTERISTIC_TWO) = {
175 ASN1_EMBED(X9_62_CHARACTERISTIC_TWO, m, INT32),
176 ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, type, ASN1_OBJECT),
177 ASN1_ADB_OBJECT(X9_62_CHARACTERISTIC_TWO)
178 } static_ASN1_SEQUENCE_END(X9_62_CHARACTERISTIC_TWO)
180 DECLARE_ASN1_ALLOC_FUNCTIONS(X9_62_CHARACTERISTIC_TWO)
181 IMPLEMENT_ASN1_ALLOC_FUNCTIONS(X9_62_CHARACTERISTIC_TWO)
183 ASN1_ADB_TEMPLATE(fieldID_def) = ASN1_SIMPLE(X9_62_FIELDID, p.other, ASN1_ANY);
185 ASN1_ADB(X9_62_FIELDID) = {
186 ADB_ENTRY(NID_X9_62_prime_field, ASN1_SIMPLE(X9_62_FIELDID, p.prime, ASN1_INTEGER)),
187 ADB_ENTRY(NID_X9_62_characteristic_two_field, ASN1_SIMPLE(X9_62_FIELDID, p.char_two, X9_62_CHARACTERISTIC_TWO))
188 } ASN1_ADB_END(X9_62_FIELDID, 0, fieldType, 0, &fieldID_def_tt, NULL);
190 ASN1_SEQUENCE(X9_62_FIELDID) = {
191 ASN1_SIMPLE(X9_62_FIELDID, fieldType, ASN1_OBJECT),
192 ASN1_ADB_OBJECT(X9_62_FIELDID)
193 } static_ASN1_SEQUENCE_END(X9_62_FIELDID)
195 ASN1_SEQUENCE(X9_62_CURVE) = {
196 ASN1_SIMPLE(X9_62_CURVE, a, ASN1_OCTET_STRING),
197 ASN1_SIMPLE(X9_62_CURVE, b, ASN1_OCTET_STRING),
198 ASN1_OPT(X9_62_CURVE, seed, ASN1_BIT_STRING)
199 } static_ASN1_SEQUENCE_END(X9_62_CURVE)
201 ASN1_SEQUENCE(ECPARAMETERS) = {
202 ASN1_EMBED(ECPARAMETERS, version, INT32),
203 ASN1_SIMPLE(ECPARAMETERS, fieldID, X9_62_FIELDID),
204 ASN1_SIMPLE(ECPARAMETERS, curve, X9_62_CURVE),
205 ASN1_SIMPLE(ECPARAMETERS, base, ASN1_OCTET_STRING),
206 ASN1_SIMPLE(ECPARAMETERS, order, ASN1_INTEGER),
207 ASN1_OPT(ECPARAMETERS, cofactor, ASN1_INTEGER)
208 } ASN1_SEQUENCE_END(ECPARAMETERS)
210 DECLARE_ASN1_ALLOC_FUNCTIONS(ECPARAMETERS)
211 IMPLEMENT_ASN1_ALLOC_FUNCTIONS(ECPARAMETERS)
213 ASN1_CHOICE(ECPKPARAMETERS) = {
214 ASN1_SIMPLE(ECPKPARAMETERS, value.named_curve, ASN1_OBJECT),
215 ASN1_SIMPLE(ECPKPARAMETERS, value.parameters, ECPARAMETERS),
216 ASN1_SIMPLE(ECPKPARAMETERS, value.implicitlyCA, ASN1_NULL)
217 } ASN1_CHOICE_END(ECPKPARAMETERS)
219 DECLARE_ASN1_FUNCTIONS_const(ECPKPARAMETERS)
220 DECLARE_ASN1_ENCODE_FUNCTIONS_const(ECPKPARAMETERS, ECPKPARAMETERS)
221 IMPLEMENT_ASN1_FUNCTIONS_const(ECPKPARAMETERS)
223 ASN1_SEQUENCE(EC_PRIVATEKEY) = {
224 ASN1_EMBED(EC_PRIVATEKEY, version, INT32),
225 ASN1_SIMPLE(EC_PRIVATEKEY, privateKey, ASN1_OCTET_STRING),
226 ASN1_EXP_OPT(EC_PRIVATEKEY, parameters, ECPKPARAMETERS, 0),
227 ASN1_EXP_OPT(EC_PRIVATEKEY, publicKey, ASN1_BIT_STRING, 1)
228 } static_ASN1_SEQUENCE_END(EC_PRIVATEKEY)
230 DECLARE_ASN1_FUNCTIONS_const(EC_PRIVATEKEY)
231 DECLARE_ASN1_ENCODE_FUNCTIONS_const(EC_PRIVATEKEY, EC_PRIVATEKEY)
232 IMPLEMENT_ASN1_FUNCTIONS_const(EC_PRIVATEKEY)
234 /* some declarations of internal function */
236 /* ec_asn1_group2field() sets the values in a X9_62_FIELDID object */
237 static int ec_asn1_group2fieldid(const EC_GROUP *, X9_62_FIELDID *);
238 /* ec_asn1_group2curve() sets the values in a X9_62_CURVE object */
239 static int ec_asn1_group2curve(const EC_GROUP *, X9_62_CURVE *);
241 /* the function definitions */
243 static int ec_asn1_group2fieldid(const EC_GROUP *group, X9_62_FIELDID *field)
248 if (group == NULL || field == NULL)
251 /* clear the old values (if necessary) */
252 ASN1_OBJECT_free(field->fieldType);
253 ASN1_TYPE_free(field->p.other);
255 nid = EC_METHOD_get_field_type(EC_GROUP_method_of(group));
256 /* set OID for the field */
257 if ((field->fieldType = OBJ_nid2obj(nid)) == NULL) {
258 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_OBJ_LIB);
262 if (nid == NID_X9_62_prime_field) {
263 if ((tmp = BN_new()) == NULL) {
264 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE);
267 /* the parameters are specified by the prime number p */
268 if (!EC_GROUP_get_curve_GFp(group, tmp, NULL, NULL, NULL)) {
269 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_EC_LIB);
272 /* set the prime number */
273 field->p.prime = BN_to_ASN1_INTEGER(tmp, NULL);
274 if (field->p.prime == NULL) {
275 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_ASN1_LIB);
278 } else if (nid == NID_X9_62_characteristic_two_field)
279 #ifdef OPENSSL_NO_EC2M
281 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, EC_R_GF2M_NOT_SUPPORTED);
287 X9_62_CHARACTERISTIC_TWO *char_two;
289 field->p.char_two = X9_62_CHARACTERISTIC_TWO_new();
290 char_two = field->p.char_two;
292 if (char_two == NULL) {
293 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE);
297 char_two->m = (long)EC_GROUP_get_degree(group);
299 field_type = EC_GROUP_get_basis_type(group);
301 if (field_type == 0) {
302 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_EC_LIB);
305 /* set base type OID */
306 if ((char_two->type = OBJ_nid2obj(field_type)) == NULL) {
307 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_OBJ_LIB);
311 if (field_type == NID_X9_62_tpBasis) {
314 if (!EC_GROUP_get_trinomial_basis(group, &k))
317 char_two->p.tpBasis = ASN1_INTEGER_new();
318 if (char_two->p.tpBasis == NULL) {
319 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE);
322 if (!ASN1_INTEGER_set(char_two->p.tpBasis, (long)k)) {
323 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_ASN1_LIB);
326 } else if (field_type == NID_X9_62_ppBasis) {
327 unsigned int k1, k2, k3;
329 if (!EC_GROUP_get_pentanomial_basis(group, &k1, &k2, &k3))
332 char_two->p.ppBasis = X9_62_PENTANOMIAL_new();
333 if (char_two->p.ppBasis == NULL) {
334 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE);
339 char_two->p.ppBasis->k1 = (long)k1;
340 char_two->p.ppBasis->k2 = (long)k2;
341 char_two->p.ppBasis->k3 = (long)k3;
342 } else { /* field_type == NID_X9_62_onBasis */
344 /* for ONB the parameters are (asn1) NULL */
345 char_two->p.onBasis = ASN1_NULL_new();
346 if (char_two->p.onBasis == NULL) {
347 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE);
354 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, EC_R_UNSUPPORTED_FIELD);
365 static int ec_asn1_group2curve(const EC_GROUP *group, X9_62_CURVE *curve)
368 BIGNUM *tmp_1 = NULL, *tmp_2 = NULL;
369 unsigned char *buffer_1 = NULL, *buffer_2 = NULL,
370 *a_buf = NULL, *b_buf = NULL;
372 unsigned char char_zero = 0;
374 if (!group || !curve || !curve->a || !curve->b)
377 if ((tmp_1 = BN_new()) == NULL || (tmp_2 = BN_new()) == NULL) {
378 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_MALLOC_FAILURE);
382 nid = EC_METHOD_get_field_type(EC_GROUP_method_of(group));
385 if (nid == NID_X9_62_prime_field) {
386 if (!EC_GROUP_get_curve_GFp(group, NULL, tmp_1, tmp_2, NULL)) {
387 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_EC_LIB);
391 #ifndef OPENSSL_NO_EC2M
392 else { /* nid == NID_X9_62_characteristic_two_field */
394 if (!EC_GROUP_get_curve_GF2m(group, NULL, tmp_1, tmp_2, NULL)) {
395 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_EC_LIB);
400 len_1 = (size_t)BN_num_bytes(tmp_1);
401 len_2 = (size_t)BN_num_bytes(tmp_2);
404 /* len_1 == 0 => a == 0 */
408 if ((buffer_1 = OPENSSL_malloc(len_1)) == NULL) {
409 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_MALLOC_FAILURE);
412 if ((len_1 = BN_bn2bin(tmp_1, buffer_1)) == 0) {
413 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_BN_LIB);
420 /* len_2 == 0 => b == 0 */
424 if ((buffer_2 = OPENSSL_malloc(len_2)) == NULL) {
425 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_MALLOC_FAILURE);
428 if ((len_2 = BN_bn2bin(tmp_2, buffer_2)) == 0) {
429 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_BN_LIB);
436 if (!ASN1_OCTET_STRING_set(curve->a, a_buf, len_1) ||
437 !ASN1_OCTET_STRING_set(curve->b, b_buf, len_2)) {
438 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_ASN1_LIB);
442 /* set the seed (optional) */
445 if ((curve->seed = ASN1_BIT_STRING_new()) == NULL) {
446 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_MALLOC_FAILURE);
449 curve->seed->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07);
450 curve->seed->flags |= ASN1_STRING_FLAG_BITS_LEFT;
451 if (!ASN1_BIT_STRING_set(curve->seed, group->seed,
452 (int)group->seed_len)) {
453 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_ASN1_LIB);
457 ASN1_BIT_STRING_free(curve->seed);
464 OPENSSL_free(buffer_1);
465 OPENSSL_free(buffer_2);
471 ECPARAMETERS *EC_GROUP_get_ecparameters(const EC_GROUP *group,
472 ECPARAMETERS *params)
475 ECPARAMETERS *ret = NULL;
477 unsigned char *buffer = NULL;
478 const EC_POINT *point = NULL;
479 point_conversion_form_t form;
481 if (params == NULL) {
482 if ((ret = ECPARAMETERS_new()) == NULL) {
483 ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, ERR_R_MALLOC_FAILURE);
489 /* set the version (always one) */
490 ret->version = (long)0x1;
492 /* set the fieldID */
493 if (!ec_asn1_group2fieldid(group, ret->fieldID)) {
494 ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, ERR_R_EC_LIB);
499 if (!ec_asn1_group2curve(group, ret->curve)) {
500 ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, ERR_R_EC_LIB);
504 /* set the base point */
505 if ((point = EC_GROUP_get0_generator(group)) == NULL) {
506 ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, EC_R_UNDEFINED_GENERATOR);
510 form = EC_GROUP_get_point_conversion_form(group);
512 len = EC_POINT_point2buf(group, point, form, &buffer, NULL);
514 ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, ERR_R_EC_LIB);
517 if (ret->base == NULL && (ret->base = ASN1_OCTET_STRING_new()) == NULL) {
518 OPENSSL_free(buffer);
519 ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, ERR_R_MALLOC_FAILURE);
522 ASN1_STRING_set0(ret->base, buffer, len);
525 tmp = EC_GROUP_get0_order(group);
527 ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, ERR_R_EC_LIB);
530 ret->order = BN_to_ASN1_INTEGER(tmp, ret->order);
531 if (ret->order == NULL) {
532 ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, ERR_R_ASN1_LIB);
536 /* set the cofactor (optional) */
537 tmp = EC_GROUP_get0_cofactor(group);
539 ret->cofactor = BN_to_ASN1_INTEGER(tmp, ret->cofactor);
540 if (ret->cofactor == NULL) {
541 ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, ERR_R_ASN1_LIB);
550 ECPARAMETERS_free(ret);
554 ECPKPARAMETERS *EC_GROUP_get_ecpkparameters(const EC_GROUP *group,
555 ECPKPARAMETERS *params)
558 ECPKPARAMETERS *ret = params;
561 if ((ret = ECPKPARAMETERS_new()) == NULL) {
562 ECerr(EC_F_EC_GROUP_GET_ECPKPARAMETERS, ERR_R_MALLOC_FAILURE);
567 ASN1_OBJECT_free(ret->value.named_curve);
568 else if (ret->type == 1 && ret->value.parameters)
569 ECPARAMETERS_free(ret->value.parameters);
572 if (EC_GROUP_get_asn1_flag(group)) {
574 * use the asn1 OID to describe the the elliptic curve parameters
576 tmp = EC_GROUP_get_curve_name(group);
579 if ((ret->value.named_curve = OBJ_nid2obj(tmp)) == NULL)
582 /* we don't know the nid => ERROR */
585 /* use the ECPARAMETERS structure */
587 if ((ret->value.parameters =
588 EC_GROUP_get_ecparameters(group, NULL)) == NULL)
593 ECPKPARAMETERS_free(ret);
599 EC_GROUP *EC_GROUP_new_from_ecparameters(const ECPARAMETERS *params)
602 EC_GROUP *ret = NULL;
603 BIGNUM *p = NULL, *a = NULL, *b = NULL;
604 EC_POINT *point = NULL;
607 if (!params->fieldID || !params->fieldID->fieldType ||
608 !params->fieldID->p.ptr) {
609 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_ASN1_ERROR);
613 /* now extract the curve parameters a and b */
614 if (!params->curve || !params->curve->a ||
615 !params->curve->a->data || !params->curve->b ||
616 !params->curve->b->data) {
617 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_ASN1_ERROR);
620 a = BN_bin2bn(params->curve->a->data, params->curve->a->length, NULL);
622 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_BN_LIB);
625 b = BN_bin2bn(params->curve->b->data, params->curve->b->length, NULL);
627 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_BN_LIB);
631 /* get the field parameters */
632 tmp = OBJ_obj2nid(params->fieldID->fieldType);
633 if (tmp == NID_X9_62_characteristic_two_field)
634 #ifdef OPENSSL_NO_EC2M
636 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_GF2M_NOT_SUPPORTED);
641 X9_62_CHARACTERISTIC_TWO *char_two;
643 char_two = params->fieldID->p.char_two;
645 field_bits = char_two->m;
646 if (field_bits > OPENSSL_ECC_MAX_FIELD_BITS) {
647 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_FIELD_TOO_LARGE);
651 if ((p = BN_new()) == NULL) {
652 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_MALLOC_FAILURE);
656 /* get the base type */
657 tmp = OBJ_obj2nid(char_two->type);
659 if (tmp == NID_X9_62_tpBasis) {
662 if (!char_two->p.tpBasis) {
663 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_ASN1_ERROR);
667 tmp_long = ASN1_INTEGER_get(char_two->p.tpBasis);
669 if (!(char_two->m > tmp_long && tmp_long > 0)) {
670 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS,
671 EC_R_INVALID_TRINOMIAL_BASIS);
675 /* create the polynomial */
676 if (!BN_set_bit(p, (int)char_two->m))
678 if (!BN_set_bit(p, (int)tmp_long))
680 if (!BN_set_bit(p, 0))
682 } else if (tmp == NID_X9_62_ppBasis) {
683 X9_62_PENTANOMIAL *penta;
685 penta = char_two->p.ppBasis;
687 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_ASN1_ERROR);
692 (char_two->m > penta->k3 && penta->k3 > penta->k2
693 && penta->k2 > penta->k1 && penta->k1 > 0)) {
694 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS,
695 EC_R_INVALID_PENTANOMIAL_BASIS);
699 /* create the polynomial */
700 if (!BN_set_bit(p, (int)char_two->m))
702 if (!BN_set_bit(p, (int)penta->k1))
704 if (!BN_set_bit(p, (int)penta->k2))
706 if (!BN_set_bit(p, (int)penta->k3))
708 if (!BN_set_bit(p, 0))
710 } else if (tmp == NID_X9_62_onBasis) {
711 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_NOT_IMPLEMENTED);
715 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_ASN1_ERROR);
719 /* create the EC_GROUP structure */
720 ret = EC_GROUP_new_curve_GF2m(p, a, b, NULL);
723 else if (tmp == NID_X9_62_prime_field) {
724 /* we have a curve over a prime field */
725 /* extract the prime number */
726 if (!params->fieldID->p.prime) {
727 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_ASN1_ERROR);
730 p = ASN1_INTEGER_to_BN(params->fieldID->p.prime, NULL);
732 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_ASN1_LIB);
736 if (BN_is_negative(p) || BN_is_zero(p)) {
737 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_INVALID_FIELD);
741 field_bits = BN_num_bits(p);
742 if (field_bits > OPENSSL_ECC_MAX_FIELD_BITS) {
743 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_FIELD_TOO_LARGE);
747 /* create the EC_GROUP structure */
748 ret = EC_GROUP_new_curve_GFp(p, a, b, NULL);
750 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_INVALID_FIELD);
755 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_EC_LIB);
759 /* extract seed (optional) */
760 if (params->curve->seed != NULL) {
761 OPENSSL_free(ret->seed);
762 if ((ret->seed = OPENSSL_malloc(params->curve->seed->length)) == NULL) {
763 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_MALLOC_FAILURE);
766 memcpy(ret->seed, params->curve->seed->data,
767 params->curve->seed->length);
768 ret->seed_len = params->curve->seed->length;
771 if (!params->order || !params->base || !params->base->data) {
772 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_ASN1_ERROR);
776 if ((point = EC_POINT_new(ret)) == NULL)
779 /* set the point conversion form */
780 EC_GROUP_set_point_conversion_form(ret, (point_conversion_form_t)
781 (params->base->data[0] & ~0x01));
783 /* extract the ec point */
784 if (!EC_POINT_oct2point(ret, point, params->base->data,
785 params->base->length, NULL)) {
786 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_EC_LIB);
790 /* extract the order */
791 if ((a = ASN1_INTEGER_to_BN(params->order, a)) == NULL) {
792 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_ASN1_LIB);
795 if (BN_is_negative(a) || BN_is_zero(a)) {
796 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_INVALID_GROUP_ORDER);
799 if (BN_num_bits(a) > (int)field_bits + 1) { /* Hasse bound */
800 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_INVALID_GROUP_ORDER);
804 /* extract the cofactor (optional) */
805 if (params->cofactor == NULL) {
808 } else if ((b = ASN1_INTEGER_to_BN(params->cofactor, b)) == NULL) {
809 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_ASN1_LIB);
812 /* set the generator, order and cofactor (if present) */
813 if (!EC_GROUP_set_generator(ret, point, a, b)) {
814 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_EC_LIB);
822 EC_GROUP_clear_free(ret);
829 EC_POINT_free(point);
833 EC_GROUP *EC_GROUP_new_from_ecpkparameters(const ECPKPARAMETERS *params)
835 EC_GROUP *ret = NULL;
838 if (params == NULL) {
839 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPKPARAMETERS, EC_R_MISSING_PARAMETERS);
843 if (params->type == 0) { /* the curve is given by an OID */
844 tmp = OBJ_obj2nid(params->value.named_curve);
845 if ((ret = EC_GROUP_new_by_curve_name(tmp)) == NULL) {
846 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPKPARAMETERS,
847 EC_R_EC_GROUP_NEW_BY_NAME_FAILURE);
850 EC_GROUP_set_asn1_flag(ret, OPENSSL_EC_NAMED_CURVE);
851 } else if (params->type == 1) { /* the parameters are given by a
852 * ECPARAMETERS structure */
853 ret = EC_GROUP_new_from_ecparameters(params->value.parameters);
855 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPKPARAMETERS, ERR_R_EC_LIB);
858 EC_GROUP_set_asn1_flag(ret, 0x0);
859 } else if (params->type == 2) { /* implicitlyCA */
862 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPKPARAMETERS, EC_R_ASN1_ERROR);
869 /* EC_GROUP <-> DER encoding of ECPKPARAMETERS */
871 EC_GROUP *d2i_ECPKParameters(EC_GROUP **a, const unsigned char **in, long len)
873 EC_GROUP *group = NULL;
874 ECPKPARAMETERS *params = NULL;
875 const unsigned char *p = *in;
877 if ((params = d2i_ECPKPARAMETERS(NULL, &p, len)) == NULL) {
878 ECerr(EC_F_D2I_ECPKPARAMETERS, EC_R_D2I_ECPKPARAMETERS_FAILURE);
879 ECPKPARAMETERS_free(params);
883 if ((group = EC_GROUP_new_from_ecpkparameters(params)) == NULL) {
884 ECerr(EC_F_D2I_ECPKPARAMETERS, EC_R_PKPARAMETERS2GROUP_FAILURE);
885 ECPKPARAMETERS_free(params);
890 EC_GROUP_clear_free(*a);
894 ECPKPARAMETERS_free(params);
899 int i2d_ECPKParameters(const EC_GROUP *a, unsigned char **out)
902 ECPKPARAMETERS *tmp = EC_GROUP_get_ecpkparameters(a, NULL);
904 ECerr(EC_F_I2D_ECPKPARAMETERS, EC_R_GROUP2PKPARAMETERS_FAILURE);
907 if ((ret = i2d_ECPKPARAMETERS(tmp, out)) == 0) {
908 ECerr(EC_F_I2D_ECPKPARAMETERS, EC_R_I2D_ECPKPARAMETERS_FAILURE);
909 ECPKPARAMETERS_free(tmp);
912 ECPKPARAMETERS_free(tmp);
916 /* some EC_KEY functions */
918 EC_KEY *d2i_ECPrivateKey(EC_KEY **a, const unsigned char **in, long len)
921 EC_PRIVATEKEY *priv_key = NULL;
922 const unsigned char *p = *in;
924 if ((priv_key = d2i_EC_PRIVATEKEY(NULL, &p, len)) == NULL) {
925 ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_EC_LIB);
929 if (a == NULL || *a == NULL) {
930 if ((ret = EC_KEY_new()) == NULL) {
931 ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_MALLOC_FAILURE);
937 if (priv_key->parameters) {
938 EC_GROUP_clear_free(ret->group);
939 ret->group = EC_GROUP_new_from_ecpkparameters(priv_key->parameters);
942 if (ret->group == NULL) {
943 ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_EC_LIB);
947 ret->version = priv_key->version;
949 if (priv_key->privateKey) {
950 ASN1_OCTET_STRING *pkey = priv_key->privateKey;
951 if (EC_KEY_oct2priv(ret, ASN1_STRING_get0_data(pkey),
952 ASN1_STRING_length(pkey)) == 0)
955 ECerr(EC_F_D2I_ECPRIVATEKEY, EC_R_MISSING_PRIVATE_KEY);
959 EC_POINT_clear_free(ret->pub_key);
960 ret->pub_key = EC_POINT_new(ret->group);
961 if (ret->pub_key == NULL) {
962 ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_EC_LIB);
966 if (priv_key->publicKey) {
967 const unsigned char *pub_oct;
970 pub_oct = ASN1_STRING_get0_data(priv_key->publicKey);
971 pub_oct_len = ASN1_STRING_length(priv_key->publicKey);
972 if (!EC_KEY_oct2key(ret, pub_oct, pub_oct_len, NULL)) {
973 ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_EC_LIB);
977 if (ret->group->meth->keygenpub == NULL
978 || ret->group->meth->keygenpub(ret) == 0)
980 /* Remember the original private-key-only encoding. */
981 ret->enc_flag |= EC_PKEY_NO_PUBKEY;
986 EC_PRIVATEKEY_free(priv_key);
991 if (a == NULL || *a != ret)
993 EC_PRIVATEKEY_free(priv_key);
997 int i2d_ECPrivateKey(EC_KEY *a, unsigned char **out)
1000 unsigned char *priv= NULL, *pub= NULL;
1001 size_t privlen = 0, publen = 0;
1003 EC_PRIVATEKEY *priv_key = NULL;
1005 if (a == NULL || a->group == NULL ||
1006 (!(a->enc_flag & EC_PKEY_NO_PUBKEY) && a->pub_key == NULL)) {
1007 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_PASSED_NULL_PARAMETER);
1011 if ((priv_key = EC_PRIVATEKEY_new()) == NULL) {
1012 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_MALLOC_FAILURE);
1016 priv_key->version = a->version;
1018 privlen = EC_KEY_priv2buf(a, &priv);
1021 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_EC_LIB);
1025 ASN1_STRING_set0(priv_key->privateKey, priv, privlen);
1028 if (!(a->enc_flag & EC_PKEY_NO_PARAMETERS)) {
1029 if ((priv_key->parameters =
1030 EC_GROUP_get_ecpkparameters(a->group,
1031 priv_key->parameters)) == NULL) {
1032 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_EC_LIB);
1037 if (!(a->enc_flag & EC_PKEY_NO_PUBKEY)) {
1038 priv_key->publicKey = ASN1_BIT_STRING_new();
1039 if (priv_key->publicKey == NULL) {
1040 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_MALLOC_FAILURE);
1044 publen = EC_KEY_key2buf(a, a->conv_form, &pub, NULL);
1047 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_EC_LIB);
1051 priv_key->publicKey->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07);
1052 priv_key->publicKey->flags |= ASN1_STRING_FLAG_BITS_LEFT;
1053 ASN1_STRING_set0(priv_key->publicKey, pub, publen);
1057 if ((ret = i2d_EC_PRIVATEKEY(priv_key, out)) == 0) {
1058 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_EC_LIB);
1063 OPENSSL_clear_free(priv, privlen);
1065 EC_PRIVATEKEY_free(priv_key);
1066 return (ok ? ret : 0);
1069 int i2d_ECParameters(EC_KEY *a, unsigned char **out)
1072 ECerr(EC_F_I2D_ECPARAMETERS, ERR_R_PASSED_NULL_PARAMETER);
1075 return i2d_ECPKParameters(a->group, out);
1078 EC_KEY *d2i_ECParameters(EC_KEY **a, const unsigned char **in, long len)
1082 if (in == NULL || *in == NULL) {
1083 ECerr(EC_F_D2I_ECPARAMETERS, ERR_R_PASSED_NULL_PARAMETER);
1087 if (a == NULL || *a == NULL) {
1088 if ((ret = EC_KEY_new()) == NULL) {
1089 ECerr(EC_F_D2I_ECPARAMETERS, ERR_R_MALLOC_FAILURE);
1095 if (!d2i_ECPKParameters(&ret->group, in, len)) {
1096 ECerr(EC_F_D2I_ECPARAMETERS, ERR_R_EC_LIB);
1097 if (a == NULL || *a != ret)
1108 EC_KEY *o2i_ECPublicKey(EC_KEY **a, const unsigned char **in, long len)
1112 if (a == NULL || (*a) == NULL || (*a)->group == NULL) {
1114 * sorry, but a EC_GROUP-structure is necessary to set the public key
1116 ECerr(EC_F_O2I_ECPUBLICKEY, ERR_R_PASSED_NULL_PARAMETER);
1120 if (!EC_KEY_oct2key(ret, *in, len, NULL)) {
1121 ECerr(EC_F_O2I_ECPUBLICKEY, ERR_R_EC_LIB);
1128 int i2o_ECPublicKey(const EC_KEY *a, unsigned char **out)
1134 ECerr(EC_F_I2O_ECPUBLICKEY, ERR_R_PASSED_NULL_PARAMETER);
1138 buf_len = EC_POINT_point2oct(a->group, a->pub_key,
1139 a->conv_form, NULL, 0, NULL);
1141 if (out == NULL || buf_len == 0)
1142 /* out == NULL => just return the length of the octet string */
1146 if ((*out = OPENSSL_malloc(buf_len)) == NULL) {
1147 ECerr(EC_F_I2O_ECPUBLICKEY, ERR_R_MALLOC_FAILURE);
1152 if (!EC_POINT_point2oct(a->group, a->pub_key, a->conv_form,
1153 *out, buf_len, NULL)) {
1154 ECerr(EC_F_I2O_ECPUBLICKEY, ERR_R_EC_LIB);
1166 ASN1_SEQUENCE(ECDSA_SIG) = {
1167 ASN1_SIMPLE(ECDSA_SIG, r, CBIGNUM),
1168 ASN1_SIMPLE(ECDSA_SIG, s, CBIGNUM)
1169 } static_ASN1_SEQUENCE_END(ECDSA_SIG)
1171 DECLARE_ASN1_FUNCTIONS_const(ECDSA_SIG)
1172 DECLARE_ASN1_ENCODE_FUNCTIONS_const(ECDSA_SIG, ECDSA_SIG)
1173 IMPLEMENT_ASN1_ENCODE_FUNCTIONS_const_fname(ECDSA_SIG, ECDSA_SIG, ECDSA_SIG)
1175 ECDSA_SIG *ECDSA_SIG_new(void)
1177 ECDSA_SIG *sig = OPENSSL_zalloc(sizeof(*sig));
1179 ECerr(EC_F_ECDSA_SIG_NEW, ERR_R_MALLOC_FAILURE);
1183 void ECDSA_SIG_free(ECDSA_SIG *sig)
1187 BN_clear_free(sig->r);
1188 BN_clear_free(sig->s);
1192 void ECDSA_SIG_get0(const ECDSA_SIG *sig, const BIGNUM **pr, const BIGNUM **ps)
1200 int ECDSA_SIG_set0(ECDSA_SIG *sig, BIGNUM *r, BIGNUM *s)
1202 if (r == NULL || s == NULL)
1204 BN_clear_free(sig->r);
1205 BN_clear_free(sig->s);
1211 int ECDSA_size(const EC_KEY *r)
1215 unsigned char buf[4];
1216 const EC_GROUP *group;
1220 group = EC_KEY_get0_group(r);
1224 i = EC_GROUP_order_bits(group);
1227 bs.length = (i + 7) / 8;
1229 bs.type = V_ASN1_INTEGER;
1230 /* If the top bit is set the asn1 encoding is 1 larger. */
1233 i = i2d_ASN1_INTEGER(&bs, NULL);
1234 i += i; /* r and s */
1235 ret = ASN1_object_size(1, i, V_ASN1_SEQUENCE);