2 * Copyright 2002-2021 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the Apache License 2.0 (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
11 * ECDSA low level APIs are deprecated for public use, but still ok for
14 #include "internal/deprecated.h"
18 #include <openssl/err.h>
19 #include <openssl/asn1t.h>
20 #include <openssl/objects.h>
21 #include "internal/nelem.h"
22 #include "crypto/asn1.h"
23 #include "crypto/asn1_dsa.h"
27 /* some structures needed for the asn1 encoding */
28 typedef struct x9_62_pentanomial_st {
34 typedef struct x9_62_characteristic_two_st {
39 /* NID_X9_62_onBasis */
41 /* NID_X9_62_tpBasis */
42 ASN1_INTEGER *tpBasis;
43 /* NID_X9_62_ppBasis */
44 X9_62_PENTANOMIAL *ppBasis;
48 } X9_62_CHARACTERISTIC_TWO;
50 typedef struct x9_62_fieldid_st {
51 ASN1_OBJECT *fieldType;
54 /* NID_X9_62_prime_field */
56 /* NID_X9_62_characteristic_two_field */
57 X9_62_CHARACTERISTIC_TWO *char_two;
63 typedef struct x9_62_curve_st {
66 ASN1_BIT_STRING *seed;
69 struct ec_parameters_st {
71 X9_62_FIELDID *fieldID;
73 ASN1_OCTET_STRING *base;
75 ASN1_INTEGER *cofactor;
76 } /* ECPARAMETERS */ ;
79 ECPKPARAMETERS_TYPE_NAMED = 0,
80 ECPKPARAMETERS_TYPE_EXPLICIT,
81 ECPKPARAMETERS_TYPE_IMPLICIT
82 } ecpk_parameters_type_t;
84 struct ecpk_parameters_st {
87 ASN1_OBJECT *named_curve;
88 ECPARAMETERS *parameters;
89 ASN1_NULL *implicitlyCA;
91 } /* ECPKPARAMETERS */ ;
93 /* SEC1 ECPrivateKey */
94 typedef struct ec_privatekey_st {
96 ASN1_OCTET_STRING *privateKey;
97 ECPKPARAMETERS *parameters;
98 ASN1_BIT_STRING *publicKey;
101 /* the OpenSSL ASN.1 definitions */
102 ASN1_SEQUENCE(X9_62_PENTANOMIAL) = {
103 ASN1_EMBED(X9_62_PENTANOMIAL, k1, INT32),
104 ASN1_EMBED(X9_62_PENTANOMIAL, k2, INT32),
105 ASN1_EMBED(X9_62_PENTANOMIAL, k3, INT32)
106 } static_ASN1_SEQUENCE_END(X9_62_PENTANOMIAL)
108 DECLARE_ASN1_ALLOC_FUNCTIONS(X9_62_PENTANOMIAL)
109 IMPLEMENT_ASN1_ALLOC_FUNCTIONS(X9_62_PENTANOMIAL)
111 ASN1_ADB_TEMPLATE(char_two_def) = ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, p.other, ASN1_ANY);
113 ASN1_ADB(X9_62_CHARACTERISTIC_TWO) = {
114 ADB_ENTRY(NID_X9_62_onBasis, ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, p.onBasis, ASN1_NULL)),
115 ADB_ENTRY(NID_X9_62_tpBasis, ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, p.tpBasis, ASN1_INTEGER)),
116 ADB_ENTRY(NID_X9_62_ppBasis, ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, p.ppBasis, X9_62_PENTANOMIAL))
117 } ASN1_ADB_END(X9_62_CHARACTERISTIC_TWO, 0, type, 0, &char_two_def_tt, NULL);
119 ASN1_SEQUENCE(X9_62_CHARACTERISTIC_TWO) = {
120 ASN1_EMBED(X9_62_CHARACTERISTIC_TWO, m, INT32),
121 ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, type, ASN1_OBJECT),
122 ASN1_ADB_OBJECT(X9_62_CHARACTERISTIC_TWO)
123 } static_ASN1_SEQUENCE_END(X9_62_CHARACTERISTIC_TWO)
125 DECLARE_ASN1_ALLOC_FUNCTIONS(X9_62_CHARACTERISTIC_TWO)
126 IMPLEMENT_ASN1_ALLOC_FUNCTIONS(X9_62_CHARACTERISTIC_TWO)
128 ASN1_ADB_TEMPLATE(fieldID_def) = ASN1_SIMPLE(X9_62_FIELDID, p.other, ASN1_ANY);
130 ASN1_ADB(X9_62_FIELDID) = {
131 ADB_ENTRY(NID_X9_62_prime_field, ASN1_SIMPLE(X9_62_FIELDID, p.prime, ASN1_INTEGER)),
132 ADB_ENTRY(NID_X9_62_characteristic_two_field, ASN1_SIMPLE(X9_62_FIELDID, p.char_two, X9_62_CHARACTERISTIC_TWO))
133 } ASN1_ADB_END(X9_62_FIELDID, 0, fieldType, 0, &fieldID_def_tt, NULL);
135 ASN1_SEQUENCE(X9_62_FIELDID) = {
136 ASN1_SIMPLE(X9_62_FIELDID, fieldType, ASN1_OBJECT),
137 ASN1_ADB_OBJECT(X9_62_FIELDID)
138 } static_ASN1_SEQUENCE_END(X9_62_FIELDID)
140 ASN1_SEQUENCE(X9_62_CURVE) = {
141 ASN1_SIMPLE(X9_62_CURVE, a, ASN1_OCTET_STRING),
142 ASN1_SIMPLE(X9_62_CURVE, b, ASN1_OCTET_STRING),
143 ASN1_OPT(X9_62_CURVE, seed, ASN1_BIT_STRING)
144 } static_ASN1_SEQUENCE_END(X9_62_CURVE)
146 ASN1_SEQUENCE(ECPARAMETERS) = {
147 ASN1_EMBED(ECPARAMETERS, version, INT32),
148 ASN1_SIMPLE(ECPARAMETERS, fieldID, X9_62_FIELDID),
149 ASN1_SIMPLE(ECPARAMETERS, curve, X9_62_CURVE),
150 ASN1_SIMPLE(ECPARAMETERS, base, ASN1_OCTET_STRING),
151 ASN1_SIMPLE(ECPARAMETERS, order, ASN1_INTEGER),
152 ASN1_OPT(ECPARAMETERS, cofactor, ASN1_INTEGER)
153 } ASN1_SEQUENCE_END(ECPARAMETERS)
155 DECLARE_ASN1_ALLOC_FUNCTIONS(ECPARAMETERS)
156 IMPLEMENT_ASN1_ALLOC_FUNCTIONS(ECPARAMETERS)
158 ASN1_CHOICE(ECPKPARAMETERS) = {
159 ASN1_SIMPLE(ECPKPARAMETERS, value.named_curve, ASN1_OBJECT),
160 ASN1_SIMPLE(ECPKPARAMETERS, value.parameters, ECPARAMETERS),
161 ASN1_SIMPLE(ECPKPARAMETERS, value.implicitlyCA, ASN1_NULL)
162 } ASN1_CHOICE_END(ECPKPARAMETERS)
164 DECLARE_ASN1_FUNCTIONS(ECPKPARAMETERS)
165 DECLARE_ASN1_ENCODE_FUNCTIONS_name(ECPKPARAMETERS, ECPKPARAMETERS)
166 IMPLEMENT_ASN1_FUNCTIONS(ECPKPARAMETERS)
168 ASN1_SEQUENCE(EC_PRIVATEKEY) = {
169 ASN1_EMBED(EC_PRIVATEKEY, version, INT32),
170 ASN1_SIMPLE(EC_PRIVATEKEY, privateKey, ASN1_OCTET_STRING),
171 ASN1_EXP_OPT(EC_PRIVATEKEY, parameters, ECPKPARAMETERS, 0),
172 ASN1_EXP_OPT(EC_PRIVATEKEY, publicKey, ASN1_BIT_STRING, 1)
173 } static_ASN1_SEQUENCE_END(EC_PRIVATEKEY)
175 DECLARE_ASN1_FUNCTIONS(EC_PRIVATEKEY)
176 DECLARE_ASN1_ENCODE_FUNCTIONS_name(EC_PRIVATEKEY, EC_PRIVATEKEY)
177 IMPLEMENT_ASN1_FUNCTIONS(EC_PRIVATEKEY)
179 /* some declarations of internal function */
181 /* ec_asn1_group2field() sets the values in a X9_62_FIELDID object */
182 static int ec_asn1_group2fieldid(const EC_GROUP *, X9_62_FIELDID *);
183 /* ec_asn1_group2curve() sets the values in a X9_62_CURVE object */
184 static int ec_asn1_group2curve(const EC_GROUP *, X9_62_CURVE *);
186 /* the function definitions */
188 static int ec_asn1_group2fieldid(const EC_GROUP *group, X9_62_FIELDID *field)
193 if (group == NULL || field == NULL)
196 /* clear the old values (if necessary) */
197 ASN1_OBJECT_free(field->fieldType);
198 ASN1_TYPE_free(field->p.other);
200 nid = EC_GROUP_get_field_type(group);
201 /* set OID for the field */
202 if ((field->fieldType = OBJ_nid2obj(nid)) == NULL) {
203 ERR_raise(ERR_LIB_EC, ERR_R_OBJ_LIB);
207 if (nid == NID_X9_62_prime_field) {
208 if ((tmp = BN_new()) == NULL) {
209 ERR_raise(ERR_LIB_EC, ERR_R_MALLOC_FAILURE);
212 /* the parameters are specified by the prime number p */
213 if (!EC_GROUP_get_curve(group, tmp, NULL, NULL, NULL)) {
214 ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
217 /* set the prime number */
218 field->p.prime = BN_to_ASN1_INTEGER(tmp, NULL);
219 if (field->p.prime == NULL) {
220 ERR_raise(ERR_LIB_EC, ERR_R_ASN1_LIB);
223 } else if (nid == NID_X9_62_characteristic_two_field)
224 #ifdef OPENSSL_NO_EC2M
226 ERR_raise(ERR_LIB_EC, EC_R_GF2M_NOT_SUPPORTED);
232 X9_62_CHARACTERISTIC_TWO *char_two;
234 field->p.char_two = X9_62_CHARACTERISTIC_TWO_new();
235 char_two = field->p.char_two;
237 if (char_two == NULL) {
238 ERR_raise(ERR_LIB_EC, ERR_R_MALLOC_FAILURE);
242 char_two->m = (long)EC_GROUP_get_degree(group);
244 field_type = EC_GROUP_get_basis_type(group);
246 if (field_type == 0) {
247 ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
250 /* set base type OID */
251 if ((char_two->type = OBJ_nid2obj(field_type)) == NULL) {
252 ERR_raise(ERR_LIB_EC, ERR_R_OBJ_LIB);
256 if (field_type == NID_X9_62_tpBasis) {
259 if (!EC_GROUP_get_trinomial_basis(group, &k))
262 char_two->p.tpBasis = ASN1_INTEGER_new();
263 if (char_two->p.tpBasis == NULL) {
264 ERR_raise(ERR_LIB_EC, ERR_R_MALLOC_FAILURE);
267 if (!ASN1_INTEGER_set(char_two->p.tpBasis, (long)k)) {
268 ERR_raise(ERR_LIB_EC, ERR_R_ASN1_LIB);
271 } else if (field_type == NID_X9_62_ppBasis) {
272 unsigned int k1, k2, k3;
274 if (!EC_GROUP_get_pentanomial_basis(group, &k1, &k2, &k3))
277 char_two->p.ppBasis = X9_62_PENTANOMIAL_new();
278 if (char_two->p.ppBasis == NULL) {
279 ERR_raise(ERR_LIB_EC, ERR_R_MALLOC_FAILURE);
284 char_two->p.ppBasis->k1 = (long)k1;
285 char_two->p.ppBasis->k2 = (long)k2;
286 char_two->p.ppBasis->k3 = (long)k3;
287 } else { /* field_type == NID_X9_62_onBasis */
289 /* for ONB the parameters are (asn1) NULL */
290 char_two->p.onBasis = ASN1_NULL_new();
291 if (char_two->p.onBasis == NULL) {
292 ERR_raise(ERR_LIB_EC, ERR_R_MALLOC_FAILURE);
299 ERR_raise(ERR_LIB_EC, EC_R_UNSUPPORTED_FIELD);
310 static int ec_asn1_group2curve(const EC_GROUP *group, X9_62_CURVE *curve)
313 BIGNUM *tmp_1 = NULL, *tmp_2 = NULL;
314 unsigned char *a_buf = NULL, *b_buf = NULL;
317 if (!group || !curve || !curve->a || !curve->b)
320 if ((tmp_1 = BN_new()) == NULL || (tmp_2 = BN_new()) == NULL) {
321 ERR_raise(ERR_LIB_EC, ERR_R_MALLOC_FAILURE);
326 if (!EC_GROUP_get_curve(group, NULL, tmp_1, tmp_2, NULL)) {
327 ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
332 * Per SEC 1, the curve coefficients must be padded up to size. See C.2's
333 * definition of Curve, C.1's definition of FieldElement, and 2.3.5's
334 * definition of how to encode the field elements.
336 len = ((size_t)EC_GROUP_get_degree(group) + 7) / 8;
337 if ((a_buf = OPENSSL_malloc(len)) == NULL
338 || (b_buf = OPENSSL_malloc(len)) == NULL) {
339 ERR_raise(ERR_LIB_EC, ERR_R_MALLOC_FAILURE);
342 if (BN_bn2binpad(tmp_1, a_buf, len) < 0
343 || BN_bn2binpad(tmp_2, b_buf, len) < 0) {
344 ERR_raise(ERR_LIB_EC, ERR_R_BN_LIB);
349 if (!ASN1_OCTET_STRING_set(curve->a, a_buf, len)
350 || !ASN1_OCTET_STRING_set(curve->b, b_buf, len)) {
351 ERR_raise(ERR_LIB_EC, ERR_R_ASN1_LIB);
355 /* set the seed (optional) */
358 if ((curve->seed = ASN1_BIT_STRING_new()) == NULL) {
359 ERR_raise(ERR_LIB_EC, ERR_R_MALLOC_FAILURE);
362 ossl_asn1_string_set_bits_left(curve->seed, 0);
363 if (!ASN1_BIT_STRING_set(curve->seed, group->seed,
364 (int)group->seed_len)) {
365 ERR_raise(ERR_LIB_EC, ERR_R_ASN1_LIB);
369 ASN1_BIT_STRING_free(curve->seed);
383 ECPARAMETERS *EC_GROUP_get_ecparameters(const EC_GROUP *group,
384 ECPARAMETERS *params)
387 ECPARAMETERS *ret = NULL;
389 unsigned char *buffer = NULL;
390 const EC_POINT *point = NULL;
391 point_conversion_form_t form;
394 if (params == NULL) {
395 if ((ret = ECPARAMETERS_new()) == NULL) {
396 ERR_raise(ERR_LIB_EC, ERR_R_MALLOC_FAILURE);
402 /* set the version (always one) */
403 ret->version = (long)0x1;
405 /* set the fieldID */
406 if (!ec_asn1_group2fieldid(group, ret->fieldID)) {
407 ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
412 if (!ec_asn1_group2curve(group, ret->curve)) {
413 ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
417 /* set the base point */
418 if ((point = EC_GROUP_get0_generator(group)) == NULL) {
419 ERR_raise(ERR_LIB_EC, EC_R_UNDEFINED_GENERATOR);
423 form = EC_GROUP_get_point_conversion_form(group);
425 len = EC_POINT_point2buf(group, point, form, &buffer, NULL);
427 ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
430 if (ret->base == NULL && (ret->base = ASN1_OCTET_STRING_new()) == NULL) {
431 OPENSSL_free(buffer);
432 ERR_raise(ERR_LIB_EC, ERR_R_MALLOC_FAILURE);
435 ASN1_STRING_set0(ret->base, buffer, len);
438 tmp = EC_GROUP_get0_order(group);
440 ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
443 ret->order = BN_to_ASN1_INTEGER(tmp, orig = ret->order);
444 if (ret->order == NULL) {
446 ERR_raise(ERR_LIB_EC, ERR_R_ASN1_LIB);
450 /* set the cofactor (optional) */
451 tmp = EC_GROUP_get0_cofactor(group);
453 ret->cofactor = BN_to_ASN1_INTEGER(tmp, orig = ret->cofactor);
454 if (ret->cofactor == NULL) {
455 ret->cofactor = orig;
456 ERR_raise(ERR_LIB_EC, ERR_R_ASN1_LIB);
465 ECPARAMETERS_free(ret);
469 ECPKPARAMETERS *EC_GROUP_get_ecpkparameters(const EC_GROUP *group,
470 ECPKPARAMETERS *params)
473 ECPKPARAMETERS *ret = params;
476 if ((ret = ECPKPARAMETERS_new()) == NULL) {
477 ERR_raise(ERR_LIB_EC, ERR_R_MALLOC_FAILURE);
481 if (ret->type == ECPKPARAMETERS_TYPE_NAMED)
482 ASN1_OBJECT_free(ret->value.named_curve);
483 else if (ret->type == ECPKPARAMETERS_TYPE_EXPLICIT
484 && ret->value.parameters != NULL)
485 ECPARAMETERS_free(ret->value.parameters);
488 if (EC_GROUP_get_asn1_flag(group) == OPENSSL_EC_NAMED_CURVE) {
490 * use the asn1 OID to describe the elliptic curve parameters
492 tmp = EC_GROUP_get_curve_name(group);
494 ASN1_OBJECT *asn1obj = OBJ_nid2obj(tmp);
496 if (asn1obj == NULL || OBJ_length(asn1obj) == 0) {
497 ASN1_OBJECT_free(asn1obj);
498 ERR_raise(ERR_LIB_EC, EC_R_MISSING_OID);
501 ret->type = ECPKPARAMETERS_TYPE_NAMED;
502 ret->value.named_curve = asn1obj;
505 /* we don't know the nid => ERROR */
508 /* use the ECPARAMETERS structure */
509 ret->type = ECPKPARAMETERS_TYPE_EXPLICIT;
510 if ((ret->value.parameters =
511 EC_GROUP_get_ecparameters(group, NULL)) == NULL)
516 ECPKPARAMETERS_free(ret);
522 EC_GROUP *EC_GROUP_new_from_ecparameters(const ECPARAMETERS *params)
525 EC_GROUP *ret = NULL, *dup = NULL;
526 BIGNUM *p = NULL, *a = NULL, *b = NULL;
527 EC_POINT *point = NULL;
529 int curve_name = NID_undef;
532 if (params->fieldID == NULL
533 || params->fieldID->fieldType == NULL
534 || params->fieldID->p.ptr == NULL) {
535 ERR_raise(ERR_LIB_EC, EC_R_ASN1_ERROR);
540 * Now extract the curve parameters a and b. Note that, although SEC 1
541 * specifies the length of their encodings, historical versions of OpenSSL
542 * encoded them incorrectly, so we must accept any length for backwards
545 if (params->curve == NULL
546 || params->curve->a == NULL || params->curve->a->data == NULL
547 || params->curve->b == NULL || params->curve->b->data == NULL) {
548 ERR_raise(ERR_LIB_EC, EC_R_ASN1_ERROR);
551 a = BN_bin2bn(params->curve->a->data, params->curve->a->length, NULL);
553 ERR_raise(ERR_LIB_EC, ERR_R_BN_LIB);
556 b = BN_bin2bn(params->curve->b->data, params->curve->b->length, NULL);
558 ERR_raise(ERR_LIB_EC, ERR_R_BN_LIB);
562 /* get the field parameters */
563 tmp = OBJ_obj2nid(params->fieldID->fieldType);
564 if (tmp == NID_X9_62_characteristic_two_field)
565 #ifdef OPENSSL_NO_EC2M
567 ERR_raise(ERR_LIB_EC, EC_R_GF2M_NOT_SUPPORTED);
572 X9_62_CHARACTERISTIC_TWO *char_two;
574 char_two = params->fieldID->p.char_two;
576 field_bits = char_two->m;
577 if (field_bits > OPENSSL_ECC_MAX_FIELD_BITS) {
578 ERR_raise(ERR_LIB_EC, EC_R_FIELD_TOO_LARGE);
582 if ((p = BN_new()) == NULL) {
583 ERR_raise(ERR_LIB_EC, ERR_R_MALLOC_FAILURE);
587 /* get the base type */
588 tmp = OBJ_obj2nid(char_two->type);
590 if (tmp == NID_X9_62_tpBasis) {
593 if (!char_two->p.tpBasis) {
594 ERR_raise(ERR_LIB_EC, EC_R_ASN1_ERROR);
598 tmp_long = ASN1_INTEGER_get(char_two->p.tpBasis);
600 if (!(char_two->m > tmp_long && tmp_long > 0)) {
601 ERR_raise(ERR_LIB_EC, EC_R_INVALID_TRINOMIAL_BASIS);
605 /* create the polynomial */
606 if (!BN_set_bit(p, (int)char_two->m))
608 if (!BN_set_bit(p, (int)tmp_long))
610 if (!BN_set_bit(p, 0))
612 } else if (tmp == NID_X9_62_ppBasis) {
613 X9_62_PENTANOMIAL *penta;
615 penta = char_two->p.ppBasis;
617 ERR_raise(ERR_LIB_EC, EC_R_ASN1_ERROR);
622 (char_two->m > penta->k3 && penta->k3 > penta->k2
623 && penta->k2 > penta->k1 && penta->k1 > 0)) {
624 ERR_raise(ERR_LIB_EC, EC_R_INVALID_PENTANOMIAL_BASIS);
628 /* create the polynomial */
629 if (!BN_set_bit(p, (int)char_two->m))
631 if (!BN_set_bit(p, (int)penta->k1))
633 if (!BN_set_bit(p, (int)penta->k2))
635 if (!BN_set_bit(p, (int)penta->k3))
637 if (!BN_set_bit(p, 0))
639 } else if (tmp == NID_X9_62_onBasis) {
640 ERR_raise(ERR_LIB_EC, EC_R_NOT_IMPLEMENTED);
644 ERR_raise(ERR_LIB_EC, EC_R_ASN1_ERROR);
648 /* create the EC_GROUP structure */
649 ret = EC_GROUP_new_curve_GF2m(p, a, b, NULL);
652 else if (tmp == NID_X9_62_prime_field) {
653 /* we have a curve over a prime field */
654 /* extract the prime number */
655 if (params->fieldID->p.prime == NULL) {
656 ERR_raise(ERR_LIB_EC, EC_R_ASN1_ERROR);
659 p = ASN1_INTEGER_to_BN(params->fieldID->p.prime, NULL);
661 ERR_raise(ERR_LIB_EC, ERR_R_ASN1_LIB);
665 if (BN_is_negative(p) || BN_is_zero(p)) {
666 ERR_raise(ERR_LIB_EC, EC_R_INVALID_FIELD);
670 field_bits = BN_num_bits(p);
671 if (field_bits > OPENSSL_ECC_MAX_FIELD_BITS) {
672 ERR_raise(ERR_LIB_EC, EC_R_FIELD_TOO_LARGE);
676 /* create the EC_GROUP structure */
677 ret = EC_GROUP_new_curve_GFp(p, a, b, NULL);
679 ERR_raise(ERR_LIB_EC, EC_R_INVALID_FIELD);
684 ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
688 /* extract seed (optional) */
689 if (params->curve->seed != NULL) {
691 * This happens for instance with
692 * fuzz/corpora/asn1/65cf44e85614c62f10cf3b7a7184c26293a19e4a
693 * and causes the OPENSSL_malloc below to choke on the
694 * zero length allocation request.
696 if (params->curve->seed->length == 0) {
697 ERR_raise(ERR_LIB_EC, EC_R_ASN1_ERROR);
700 OPENSSL_free(ret->seed);
701 if ((ret->seed = OPENSSL_malloc(params->curve->seed->length)) == NULL) {
702 ERR_raise(ERR_LIB_EC, ERR_R_MALLOC_FAILURE);
705 memcpy(ret->seed, params->curve->seed->data,
706 params->curve->seed->length);
707 ret->seed_len = params->curve->seed->length;
710 if (params->order == NULL
711 || params->base == NULL
712 || params->base->data == NULL
713 || params->base->length == 0) {
714 ERR_raise(ERR_LIB_EC, EC_R_ASN1_ERROR);
718 if ((point = EC_POINT_new(ret)) == NULL)
721 /* set the point conversion form */
722 EC_GROUP_set_point_conversion_form(ret, (point_conversion_form_t)
723 (params->base->data[0] & ~0x01));
725 /* extract the ec point */
726 if (!EC_POINT_oct2point(ret, point, params->base->data,
727 params->base->length, NULL)) {
728 ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
732 /* extract the order */
733 if (ASN1_INTEGER_to_BN(params->order, a) == NULL) {
734 ERR_raise(ERR_LIB_EC, ERR_R_ASN1_LIB);
737 if (BN_is_negative(a) || BN_is_zero(a)) {
738 ERR_raise(ERR_LIB_EC, EC_R_INVALID_GROUP_ORDER);
741 if (BN_num_bits(a) > (int)field_bits + 1) { /* Hasse bound */
742 ERR_raise(ERR_LIB_EC, EC_R_INVALID_GROUP_ORDER);
746 /* extract the cofactor (optional) */
747 if (params->cofactor == NULL) {
750 } else if (ASN1_INTEGER_to_BN(params->cofactor, b) == NULL) {
751 ERR_raise(ERR_LIB_EC, ERR_R_ASN1_LIB);
754 /* set the generator, order and cofactor (if present) */
755 if (!EC_GROUP_set_generator(ret, point, a, b)) {
756 ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
761 * Check if the explicit parameters group just created matches one of the
764 * We create a copy of the group just built, so that we can remove optional
765 * fields for the lookup: we do this to avoid the possibility that one of
766 * the optional parameters is used to force the library into using a less
767 * performant and less secure EC_METHOD instead of the specialized one.
768 * In any case, `seed` is not really used in any computation, while a
769 * cofactor different from the one in the built-in table is just
770 * mathematically wrong anyway and should not be used.
772 if ((ctx = BN_CTX_new()) == NULL) {
773 ERR_raise(ERR_LIB_EC, ERR_R_BN_LIB);
776 if ((dup = EC_GROUP_dup(ret)) == NULL
777 || EC_GROUP_set_seed(dup, NULL, 0) != 1
778 || !EC_GROUP_set_generator(dup, point, a, NULL)) {
779 ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
782 if ((curve_name = ossl_ec_curve_nid_from_params(dup, ctx)) != NID_undef) {
784 * The input explicit parameters successfully matched one of the
785 * built-in curves: often for built-in curves we have specialized
786 * methods with better performance and hardening.
788 * In this case we replace the `EC_GROUP` created through explicit
789 * parameters with one created from a named group.
791 EC_GROUP *named_group = NULL;
793 #ifndef OPENSSL_NO_EC_NISTP_64_GCC_128
795 * NID_wap_wsg_idm_ecid_wtls12 and NID_secp224r1 are both aliases for
796 * the same curve, we prefer the SECP nid when matching explicit
797 * parameters as that is associated with a specialized EC_METHOD.
799 if (curve_name == NID_wap_wsg_idm_ecid_wtls12)
800 curve_name = NID_secp224r1;
801 #endif /* !def(OPENSSL_NO_EC_NISTP_64_GCC_128) */
803 if ((named_group = EC_GROUP_new_by_curve_name(curve_name)) == NULL) {
804 ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
811 * Set the flag so that EC_GROUPs created from explicit parameters are
812 * serialized using explicit parameters by default.
814 EC_GROUP_set_asn1_flag(ret, OPENSSL_EC_EXPLICIT_CURVE);
817 * If the input params do not contain the optional seed field we make
818 * sure it is not added to the returned group.
820 * The seed field is not really used inside libcrypto anyway, and
821 * adding it to parsed explicit parameter keys would alter their DER
822 * encoding output (because of the extra field) which could impact
823 * applications fingerprinting keys by their DER encoding.
825 if (params->curve->seed == NULL) {
826 if (EC_GROUP_set_seed(ret, NULL, 0) != 1)
843 EC_POINT_free(point);
850 EC_GROUP *EC_GROUP_new_from_ecpkparameters(const ECPKPARAMETERS *params)
852 EC_GROUP *ret = NULL;
855 if (params == NULL) {
856 ERR_raise(ERR_LIB_EC, EC_R_MISSING_PARAMETERS);
860 if (params->type == ECPKPARAMETERS_TYPE_NAMED) {
861 /* the curve is given by an OID */
862 tmp = OBJ_obj2nid(params->value.named_curve);
863 if ((ret = EC_GROUP_new_by_curve_name(tmp)) == NULL) {
864 ERR_raise(ERR_LIB_EC, EC_R_EC_GROUP_NEW_BY_NAME_FAILURE);
867 EC_GROUP_set_asn1_flag(ret, OPENSSL_EC_NAMED_CURVE);
868 } else if (params->type == ECPKPARAMETERS_TYPE_EXPLICIT) {
869 /* the parameters are given by an ECPARAMETERS structure */
870 ret = EC_GROUP_new_from_ecparameters(params->value.parameters);
872 ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
875 EC_GROUP_set_asn1_flag(ret, OPENSSL_EC_EXPLICIT_CURVE);
876 } else if (params->type == ECPKPARAMETERS_TYPE_IMPLICIT) {
877 /* implicit parameters inherited from CA - unsupported */
880 ERR_raise(ERR_LIB_EC, EC_R_ASN1_ERROR);
887 /* EC_GROUP <-> DER encoding of ECPKPARAMETERS */
889 EC_GROUP *d2i_ECPKParameters(EC_GROUP **a, const unsigned char **in, long len)
891 EC_GROUP *group = NULL;
892 ECPKPARAMETERS *params = NULL;
893 const unsigned char *p = *in;
895 if ((params = d2i_ECPKPARAMETERS(NULL, &p, len)) == NULL) {
896 ECPKPARAMETERS_free(params);
900 if ((group = EC_GROUP_new_from_ecpkparameters(params)) == NULL) {
901 ECPKPARAMETERS_free(params);
905 if (params->type == ECPKPARAMETERS_TYPE_EXPLICIT)
906 group->decoded_from_explicit_params = 1;
913 ECPKPARAMETERS_free(params);
918 int i2d_ECPKParameters(const EC_GROUP *a, unsigned char **out)
921 ECPKPARAMETERS *tmp = EC_GROUP_get_ecpkparameters(a, NULL);
923 ERR_raise(ERR_LIB_EC, EC_R_GROUP2PKPARAMETERS_FAILURE);
926 if ((ret = i2d_ECPKPARAMETERS(tmp, out)) == 0) {
927 ERR_raise(ERR_LIB_EC, EC_R_I2D_ECPKPARAMETERS_FAILURE);
928 ECPKPARAMETERS_free(tmp);
931 ECPKPARAMETERS_free(tmp);
935 /* some EC_KEY functions */
937 EC_KEY *d2i_ECPrivateKey(EC_KEY **a, const unsigned char **in, long len)
940 EC_PRIVATEKEY *priv_key = NULL;
941 const unsigned char *p = *in;
943 if ((priv_key = d2i_EC_PRIVATEKEY(NULL, &p, len)) == NULL)
946 if (a == NULL || *a == NULL) {
947 if ((ret = EC_KEY_new()) == NULL) {
948 ERR_raise(ERR_LIB_EC, ERR_R_MALLOC_FAILURE);
954 if (priv_key->parameters) {
955 EC_GROUP_free(ret->group);
956 ret->group = EC_GROUP_new_from_ecpkparameters(priv_key->parameters);
957 if (ret->group != NULL
958 && priv_key->parameters->type == ECPKPARAMETERS_TYPE_EXPLICIT)
959 ret->group->decoded_from_explicit_params = 1;
962 if (ret->group == NULL) {
963 ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
967 ret->version = priv_key->version;
969 if (priv_key->privateKey) {
970 ASN1_OCTET_STRING *pkey = priv_key->privateKey;
971 if (EC_KEY_oct2priv(ret, ASN1_STRING_get0_data(pkey),
972 ASN1_STRING_length(pkey)) == 0)
975 ERR_raise(ERR_LIB_EC, EC_R_MISSING_PRIVATE_KEY);
979 if (EC_GROUP_get_curve_name(ret->group) == NID_sm2)
980 EC_KEY_set_flags(ret, EC_FLAG_SM2_RANGE);
982 EC_POINT_clear_free(ret->pub_key);
983 ret->pub_key = EC_POINT_new(ret->group);
984 if (ret->pub_key == NULL) {
985 ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
989 if (priv_key->publicKey) {
990 const unsigned char *pub_oct;
993 pub_oct = ASN1_STRING_get0_data(priv_key->publicKey);
994 pub_oct_len = ASN1_STRING_length(priv_key->publicKey);
995 if (!EC_KEY_oct2key(ret, pub_oct, pub_oct_len, NULL)) {
996 ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
1000 if (ret->group->meth->keygenpub == NULL
1001 || ret->group->meth->keygenpub(ret) == 0)
1003 /* Remember the original private-key-only encoding. */
1004 ret->enc_flag |= EC_PKEY_NO_PUBKEY;
1009 EC_PRIVATEKEY_free(priv_key);
1015 if (a == NULL || *a != ret)
1017 EC_PRIVATEKEY_free(priv_key);
1021 int i2d_ECPrivateKey(const EC_KEY *a, unsigned char **out)
1023 int ret = 0, ok = 0;
1024 unsigned char *priv= NULL, *pub= NULL;
1025 size_t privlen = 0, publen = 0;
1027 EC_PRIVATEKEY *priv_key = NULL;
1029 if (a == NULL || a->group == NULL ||
1030 (!(a->enc_flag & EC_PKEY_NO_PUBKEY) && a->pub_key == NULL)) {
1031 ERR_raise(ERR_LIB_EC, ERR_R_PASSED_NULL_PARAMETER);
1035 if ((priv_key = EC_PRIVATEKEY_new()) == NULL) {
1036 ERR_raise(ERR_LIB_EC, ERR_R_MALLOC_FAILURE);
1040 priv_key->version = a->version;
1042 privlen = EC_KEY_priv2buf(a, &priv);
1045 ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
1049 ASN1_STRING_set0(priv_key->privateKey, priv, privlen);
1052 if (!(a->enc_flag & EC_PKEY_NO_PARAMETERS)) {
1053 if ((priv_key->parameters =
1054 EC_GROUP_get_ecpkparameters(a->group,
1055 priv_key->parameters)) == NULL) {
1056 ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
1061 if (!(a->enc_flag & EC_PKEY_NO_PUBKEY)) {
1062 priv_key->publicKey = ASN1_BIT_STRING_new();
1063 if (priv_key->publicKey == NULL) {
1064 ERR_raise(ERR_LIB_EC, ERR_R_MALLOC_FAILURE);
1068 publen = EC_KEY_key2buf(a, a->conv_form, &pub, NULL);
1071 ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
1075 ossl_asn1_string_set_bits_left(priv_key->publicKey, 0);
1076 ASN1_STRING_set0(priv_key->publicKey, pub, publen);
1080 if ((ret = i2d_EC_PRIVATEKEY(priv_key, out)) == 0) {
1081 ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
1086 OPENSSL_clear_free(priv, privlen);
1088 EC_PRIVATEKEY_free(priv_key);
1089 return (ok ? ret : 0);
1092 int i2d_ECParameters(const EC_KEY *a, unsigned char **out)
1095 ERR_raise(ERR_LIB_EC, ERR_R_PASSED_NULL_PARAMETER);
1098 return i2d_ECPKParameters(a->group, out);
1101 EC_KEY *d2i_ECParameters(EC_KEY **a, const unsigned char **in, long len)
1105 if (in == NULL || *in == NULL) {
1106 ERR_raise(ERR_LIB_EC, ERR_R_PASSED_NULL_PARAMETER);
1110 if (a == NULL || *a == NULL) {
1111 if ((ret = EC_KEY_new()) == NULL) {
1112 ERR_raise(ERR_LIB_EC, ERR_R_MALLOC_FAILURE);
1118 if (!d2i_ECPKParameters(&ret->group, in, len)) {
1119 if (a == NULL || *a != ret)
1126 if (EC_GROUP_get_curve_name(ret->group) == NID_sm2)
1127 EC_KEY_set_flags(ret, EC_FLAG_SM2_RANGE);
1137 EC_KEY *o2i_ECPublicKey(EC_KEY **a, const unsigned char **in, long len)
1141 if (a == NULL || (*a) == NULL || (*a)->group == NULL) {
1143 * sorry, but a EC_GROUP-structure is necessary to set the public key
1145 ERR_raise(ERR_LIB_EC, ERR_R_PASSED_NULL_PARAMETER);
1149 /* EC_KEY_opt2key updates dirty_cnt */
1150 if (!EC_KEY_oct2key(ret, *in, len, NULL)) {
1151 ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
1158 int i2o_ECPublicKey(const EC_KEY *a, unsigned char **out)
1164 ERR_raise(ERR_LIB_EC, ERR_R_PASSED_NULL_PARAMETER);
1168 buf_len = EC_POINT_point2oct(a->group, a->pub_key,
1169 a->conv_form, NULL, 0, NULL);
1171 if (out == NULL || buf_len == 0)
1172 /* out == NULL => just return the length of the octet string */
1176 if ((*out = OPENSSL_malloc(buf_len)) == NULL) {
1177 ERR_raise(ERR_LIB_EC, ERR_R_MALLOC_FAILURE);
1182 if (!EC_POINT_point2oct(a->group, a->pub_key, a->conv_form,
1183 *out, buf_len, NULL)) {
1184 ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
1196 DECLARE_ASN1_FUNCTIONS(ECDSA_SIG)
1197 DECLARE_ASN1_ENCODE_FUNCTIONS_name(ECDSA_SIG, ECDSA_SIG)
1199 #endif /* FIPS_MODULE */
1201 ECDSA_SIG *ECDSA_SIG_new(void)
1203 ECDSA_SIG *sig = OPENSSL_zalloc(sizeof(*sig));
1205 ERR_raise(ERR_LIB_EC, ERR_R_MALLOC_FAILURE);
1209 void ECDSA_SIG_free(ECDSA_SIG *sig)
1213 BN_clear_free(sig->r);
1214 BN_clear_free(sig->s);
1218 ECDSA_SIG *d2i_ECDSA_SIG(ECDSA_SIG **psig, const unsigned char **ppin, long len)
1224 if (psig != NULL && *psig != NULL) {
1227 sig = ECDSA_SIG_new();
1235 if (sig->r == NULL || sig->s == NULL
1236 || ossl_decode_der_dsa_sig(sig->r, sig->s, ppin, (size_t)len) == 0) {
1237 if (psig == NULL || *psig == NULL)
1238 ECDSA_SIG_free(sig);
1241 if (psig != NULL && *psig == NULL)
1246 int i2d_ECDSA_SIG(const ECDSA_SIG *sig, unsigned char **ppout)
1248 BUF_MEM *buf = NULL;
1252 if (ppout == NULL) {
1253 if (!WPACKET_init_null(&pkt, 0))
1255 } else if (*ppout == NULL) {
1256 if ((buf = BUF_MEM_new()) == NULL
1257 || !WPACKET_init_len(&pkt, buf, 0)) {
1262 if (!WPACKET_init_static_len(&pkt, *ppout, SIZE_MAX, 0))
1266 if (!ossl_encode_der_dsa_sig(&pkt, sig->r, sig->s)
1267 || !WPACKET_get_total_written(&pkt, &encoded_len)
1268 || !WPACKET_finish(&pkt)) {
1270 WPACKET_cleanup(&pkt);
1274 if (ppout != NULL) {
1275 if (*ppout == NULL) {
1276 *ppout = (unsigned char *)buf->data;
1280 *ppout += encoded_len;
1284 return (int)encoded_len;
1287 void ECDSA_SIG_get0(const ECDSA_SIG *sig, const BIGNUM **pr, const BIGNUM **ps)
1295 const BIGNUM *ECDSA_SIG_get0_r(const ECDSA_SIG *sig)
1300 const BIGNUM *ECDSA_SIG_get0_s(const ECDSA_SIG *sig)
1305 int ECDSA_SIG_set0(ECDSA_SIG *sig, BIGNUM *r, BIGNUM *s)
1307 if (r == NULL || s == NULL)
1309 BN_clear_free(sig->r);
1310 BN_clear_free(sig->s);
1316 int ECDSA_size(const EC_KEY *ec)
1320 const EC_GROUP *group;
1325 group = EC_KEY_get0_group(ec);
1329 bn = EC_GROUP_get0_order(group);
1333 sig.r = sig.s = (BIGNUM *)bn;
1334 ret = i2d_ECDSA_SIG(&sig, NULL);