2 * Copyright 2002-2018 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>
15 #include "internal/nelem.h"
17 int EC_GROUP_get_basis_type(const EC_GROUP *group)
21 if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
22 NID_X9_62_characteristic_two_field)
23 /* everything else is currently not supported */
26 /* Find the last non-zero element of group->poly[] */
28 i < (int)OSSL_NELEM(group->poly) && group->poly[i] != 0;
33 return NID_X9_62_ppBasis;
35 return NID_X9_62_tpBasis;
37 /* everything else is currently not supported */
41 #ifndef OPENSSL_NO_EC2M
42 int EC_GROUP_get_trinomial_basis(const EC_GROUP *group, unsigned int *k)
47 if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
48 NID_X9_62_characteristic_two_field
49 || !((group->poly[0] != 0) && (group->poly[1] != 0)
50 && (group->poly[2] == 0))) {
51 ECerr(EC_F_EC_GROUP_GET_TRINOMIAL_BASIS,
52 ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
62 int EC_GROUP_get_pentanomial_basis(const EC_GROUP *group, unsigned int *k1,
63 unsigned int *k2, unsigned int *k3)
68 if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
69 NID_X9_62_characteristic_two_field
70 || !((group->poly[0] != 0) && (group->poly[1] != 0)
71 && (group->poly[2] != 0) && (group->poly[3] != 0)
72 && (group->poly[4] == 0))) {
73 ECerr(EC_F_EC_GROUP_GET_PENTANOMIAL_BASIS,
74 ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
89 /* some structures needed for the asn1 encoding */
90 typedef struct x9_62_pentanomial_st {
96 typedef struct x9_62_characteristic_two_st {
101 /* NID_X9_62_onBasis */
103 /* NID_X9_62_tpBasis */
104 ASN1_INTEGER *tpBasis;
105 /* NID_X9_62_ppBasis */
106 X9_62_PENTANOMIAL *ppBasis;
110 } X9_62_CHARACTERISTIC_TWO;
112 typedef struct x9_62_fieldid_st {
113 ASN1_OBJECT *fieldType;
116 /* NID_X9_62_prime_field */
118 /* NID_X9_62_characteristic_two_field */
119 X9_62_CHARACTERISTIC_TWO *char_two;
125 typedef struct x9_62_curve_st {
126 ASN1_OCTET_STRING *a;
127 ASN1_OCTET_STRING *b;
128 ASN1_BIT_STRING *seed;
131 struct ec_parameters_st {
133 X9_62_FIELDID *fieldID;
135 ASN1_OCTET_STRING *base;
137 ASN1_INTEGER *cofactor;
138 } /* ECPARAMETERS */ ;
140 struct ecpk_parameters_st {
143 ASN1_OBJECT *named_curve;
144 ECPARAMETERS *parameters;
145 ASN1_NULL *implicitlyCA;
147 } /* ECPKPARAMETERS */ ;
149 /* SEC1 ECPrivateKey */
150 typedef struct ec_privatekey_st {
152 ASN1_OCTET_STRING *privateKey;
153 ECPKPARAMETERS *parameters;
154 ASN1_BIT_STRING *publicKey;
157 /* the OpenSSL ASN.1 definitions */
158 ASN1_SEQUENCE(X9_62_PENTANOMIAL) = {
159 ASN1_EMBED(X9_62_PENTANOMIAL, k1, INT32),
160 ASN1_EMBED(X9_62_PENTANOMIAL, k2, INT32),
161 ASN1_EMBED(X9_62_PENTANOMIAL, k3, INT32)
162 } static_ASN1_SEQUENCE_END(X9_62_PENTANOMIAL)
164 DECLARE_ASN1_ALLOC_FUNCTIONS(X9_62_PENTANOMIAL)
165 IMPLEMENT_ASN1_ALLOC_FUNCTIONS(X9_62_PENTANOMIAL)
167 ASN1_ADB_TEMPLATE(char_two_def) = ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, p.other, ASN1_ANY);
169 ASN1_ADB(X9_62_CHARACTERISTIC_TWO) = {
170 ADB_ENTRY(NID_X9_62_onBasis, ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, p.onBasis, ASN1_NULL)),
171 ADB_ENTRY(NID_X9_62_tpBasis, ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, p.tpBasis, ASN1_INTEGER)),
172 ADB_ENTRY(NID_X9_62_ppBasis, ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, p.ppBasis, X9_62_PENTANOMIAL))
173 } ASN1_ADB_END(X9_62_CHARACTERISTIC_TWO, 0, type, 0, &char_two_def_tt, NULL);
175 ASN1_SEQUENCE(X9_62_CHARACTERISTIC_TWO) = {
176 ASN1_EMBED(X9_62_CHARACTERISTIC_TWO, m, INT32),
177 ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, type, ASN1_OBJECT),
178 ASN1_ADB_OBJECT(X9_62_CHARACTERISTIC_TWO)
179 } static_ASN1_SEQUENCE_END(X9_62_CHARACTERISTIC_TWO)
181 DECLARE_ASN1_ALLOC_FUNCTIONS(X9_62_CHARACTERISTIC_TWO)
182 IMPLEMENT_ASN1_ALLOC_FUNCTIONS(X9_62_CHARACTERISTIC_TWO)
184 ASN1_ADB_TEMPLATE(fieldID_def) = ASN1_SIMPLE(X9_62_FIELDID, p.other, ASN1_ANY);
186 ASN1_ADB(X9_62_FIELDID) = {
187 ADB_ENTRY(NID_X9_62_prime_field, ASN1_SIMPLE(X9_62_FIELDID, p.prime, ASN1_INTEGER)),
188 ADB_ENTRY(NID_X9_62_characteristic_two_field, ASN1_SIMPLE(X9_62_FIELDID, p.char_two, X9_62_CHARACTERISTIC_TWO))
189 } ASN1_ADB_END(X9_62_FIELDID, 0, fieldType, 0, &fieldID_def_tt, NULL);
191 ASN1_SEQUENCE(X9_62_FIELDID) = {
192 ASN1_SIMPLE(X9_62_FIELDID, fieldType, ASN1_OBJECT),
193 ASN1_ADB_OBJECT(X9_62_FIELDID)
194 } static_ASN1_SEQUENCE_END(X9_62_FIELDID)
196 ASN1_SEQUENCE(X9_62_CURVE) = {
197 ASN1_SIMPLE(X9_62_CURVE, a, ASN1_OCTET_STRING),
198 ASN1_SIMPLE(X9_62_CURVE, b, ASN1_OCTET_STRING),
199 ASN1_OPT(X9_62_CURVE, seed, ASN1_BIT_STRING)
200 } static_ASN1_SEQUENCE_END(X9_62_CURVE)
202 ASN1_SEQUENCE(ECPARAMETERS) = {
203 ASN1_EMBED(ECPARAMETERS, version, INT32),
204 ASN1_SIMPLE(ECPARAMETERS, fieldID, X9_62_FIELDID),
205 ASN1_SIMPLE(ECPARAMETERS, curve, X9_62_CURVE),
206 ASN1_SIMPLE(ECPARAMETERS, base, ASN1_OCTET_STRING),
207 ASN1_SIMPLE(ECPARAMETERS, order, ASN1_INTEGER),
208 ASN1_OPT(ECPARAMETERS, cofactor, ASN1_INTEGER)
209 } ASN1_SEQUENCE_END(ECPARAMETERS)
211 DECLARE_ASN1_ALLOC_FUNCTIONS(ECPARAMETERS)
212 IMPLEMENT_ASN1_ALLOC_FUNCTIONS(ECPARAMETERS)
214 ASN1_CHOICE(ECPKPARAMETERS) = {
215 ASN1_SIMPLE(ECPKPARAMETERS, value.named_curve, ASN1_OBJECT),
216 ASN1_SIMPLE(ECPKPARAMETERS, value.parameters, ECPARAMETERS),
217 ASN1_SIMPLE(ECPKPARAMETERS, value.implicitlyCA, ASN1_NULL)
218 } ASN1_CHOICE_END(ECPKPARAMETERS)
220 DECLARE_ASN1_FUNCTIONS_const(ECPKPARAMETERS)
221 DECLARE_ASN1_ENCODE_FUNCTIONS_const(ECPKPARAMETERS, ECPKPARAMETERS)
222 IMPLEMENT_ASN1_FUNCTIONS_const(ECPKPARAMETERS)
224 ASN1_SEQUENCE(EC_PRIVATEKEY) = {
225 ASN1_EMBED(EC_PRIVATEKEY, version, INT32),
226 ASN1_SIMPLE(EC_PRIVATEKEY, privateKey, ASN1_OCTET_STRING),
227 ASN1_EXP_OPT(EC_PRIVATEKEY, parameters, ECPKPARAMETERS, 0),
228 ASN1_EXP_OPT(EC_PRIVATEKEY, publicKey, ASN1_BIT_STRING, 1)
229 } static_ASN1_SEQUENCE_END(EC_PRIVATEKEY)
231 DECLARE_ASN1_FUNCTIONS_const(EC_PRIVATEKEY)
232 DECLARE_ASN1_ENCODE_FUNCTIONS_const(EC_PRIVATEKEY, EC_PRIVATEKEY)
233 IMPLEMENT_ASN1_FUNCTIONS_const(EC_PRIVATEKEY)
235 /* some declarations of internal function */
237 /* ec_asn1_group2field() sets the values in a X9_62_FIELDID object */
238 static int ec_asn1_group2fieldid(const EC_GROUP *, X9_62_FIELDID *);
239 /* ec_asn1_group2curve() sets the values in a X9_62_CURVE object */
240 static int ec_asn1_group2curve(const EC_GROUP *, X9_62_CURVE *);
242 /* the function definitions */
244 static int ec_asn1_group2fieldid(const EC_GROUP *group, X9_62_FIELDID *field)
249 if (group == NULL || field == NULL)
252 /* clear the old values (if necessary) */
253 ASN1_OBJECT_free(field->fieldType);
254 ASN1_TYPE_free(field->p.other);
256 nid = EC_METHOD_get_field_type(EC_GROUP_method_of(group));
257 /* set OID for the field */
258 if ((field->fieldType = OBJ_nid2obj(nid)) == NULL) {
259 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_OBJ_LIB);
263 if (nid == NID_X9_62_prime_field) {
264 if ((tmp = BN_new()) == NULL) {
265 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE);
268 /* the parameters are specified by the prime number p */
269 if (!EC_GROUP_get_curve_GFp(group, tmp, NULL, NULL, NULL)) {
270 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_EC_LIB);
273 /* set the prime number */
274 field->p.prime = BN_to_ASN1_INTEGER(tmp, NULL);
275 if (field->p.prime == NULL) {
276 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_ASN1_LIB);
279 } else if (nid == NID_X9_62_characteristic_two_field)
280 #ifdef OPENSSL_NO_EC2M
282 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, EC_R_GF2M_NOT_SUPPORTED);
288 X9_62_CHARACTERISTIC_TWO *char_two;
290 field->p.char_two = X9_62_CHARACTERISTIC_TWO_new();
291 char_two = field->p.char_two;
293 if (char_two == NULL) {
294 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE);
298 char_two->m = (long)EC_GROUP_get_degree(group);
300 field_type = EC_GROUP_get_basis_type(group);
302 if (field_type == 0) {
303 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_EC_LIB);
306 /* set base type OID */
307 if ((char_two->type = OBJ_nid2obj(field_type)) == NULL) {
308 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_OBJ_LIB);
312 if (field_type == NID_X9_62_tpBasis) {
315 if (!EC_GROUP_get_trinomial_basis(group, &k))
318 char_two->p.tpBasis = ASN1_INTEGER_new();
319 if (char_two->p.tpBasis == NULL) {
320 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE);
323 if (!ASN1_INTEGER_set(char_two->p.tpBasis, (long)k)) {
324 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_ASN1_LIB);
327 } else if (field_type == NID_X9_62_ppBasis) {
328 unsigned int k1, k2, k3;
330 if (!EC_GROUP_get_pentanomial_basis(group, &k1, &k2, &k3))
333 char_two->p.ppBasis = X9_62_PENTANOMIAL_new();
334 if (char_two->p.ppBasis == NULL) {
335 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE);
340 char_two->p.ppBasis->k1 = (long)k1;
341 char_two->p.ppBasis->k2 = (long)k2;
342 char_two->p.ppBasis->k3 = (long)k3;
343 } else { /* field_type == NID_X9_62_onBasis */
345 /* for ONB the parameters are (asn1) NULL */
346 char_two->p.onBasis = ASN1_NULL_new();
347 if (char_two->p.onBasis == NULL) {
348 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE);
355 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, EC_R_UNSUPPORTED_FIELD);
366 static int ec_asn1_group2curve(const EC_GROUP *group, X9_62_CURVE *curve)
369 BIGNUM *tmp_1 = NULL, *tmp_2 = NULL;
370 unsigned char *buffer_1 = NULL, *buffer_2 = NULL,
371 *a_buf = NULL, *b_buf = NULL;
373 unsigned char char_zero = 0;
375 if (!group || !curve || !curve->a || !curve->b)
378 if ((tmp_1 = BN_new()) == NULL || (tmp_2 = BN_new()) == NULL) {
379 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_MALLOC_FAILURE);
383 nid = EC_METHOD_get_field_type(EC_GROUP_method_of(group));
386 if (nid == NID_X9_62_prime_field) {
387 if (!EC_GROUP_get_curve_GFp(group, NULL, tmp_1, tmp_2, NULL)) {
388 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_EC_LIB);
392 #ifndef OPENSSL_NO_EC2M
393 else { /* nid == NID_X9_62_characteristic_two_field */
395 if (!EC_GROUP_get_curve_GF2m(group, NULL, tmp_1, tmp_2, NULL)) {
396 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_EC_LIB);
401 len_1 = (size_t)BN_num_bytes(tmp_1);
402 len_2 = (size_t)BN_num_bytes(tmp_2);
405 /* len_1 == 0 => a == 0 */
409 if ((buffer_1 = OPENSSL_malloc(len_1)) == NULL) {
410 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_MALLOC_FAILURE);
413 if ((len_1 = BN_bn2bin(tmp_1, buffer_1)) == 0) {
414 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_BN_LIB);
421 /* len_2 == 0 => b == 0 */
425 if ((buffer_2 = OPENSSL_malloc(len_2)) == NULL) {
426 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_MALLOC_FAILURE);
429 if ((len_2 = BN_bn2bin(tmp_2, buffer_2)) == 0) {
430 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_BN_LIB);
437 if (!ASN1_OCTET_STRING_set(curve->a, a_buf, len_1) ||
438 !ASN1_OCTET_STRING_set(curve->b, b_buf, len_2)) {
439 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_ASN1_LIB);
443 /* set the seed (optional) */
446 if ((curve->seed = ASN1_BIT_STRING_new()) == NULL) {
447 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_MALLOC_FAILURE);
450 curve->seed->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07);
451 curve->seed->flags |= ASN1_STRING_FLAG_BITS_LEFT;
452 if (!ASN1_BIT_STRING_set(curve->seed, group->seed,
453 (int)group->seed_len)) {
454 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_ASN1_LIB);
458 ASN1_BIT_STRING_free(curve->seed);
465 OPENSSL_free(buffer_1);
466 OPENSSL_free(buffer_2);
472 ECPARAMETERS *EC_GROUP_get_ecparameters(const EC_GROUP *group,
473 ECPARAMETERS *params)
476 ECPARAMETERS *ret = NULL;
478 unsigned char *buffer = NULL;
479 const EC_POINT *point = NULL;
480 point_conversion_form_t form;
482 if (params == NULL) {
483 if ((ret = ECPARAMETERS_new()) == NULL) {
484 ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, ERR_R_MALLOC_FAILURE);
490 /* set the version (always one) */
491 ret->version = (long)0x1;
493 /* set the fieldID */
494 if (!ec_asn1_group2fieldid(group, ret->fieldID)) {
495 ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, ERR_R_EC_LIB);
500 if (!ec_asn1_group2curve(group, ret->curve)) {
501 ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, ERR_R_EC_LIB);
505 /* set the base point */
506 if ((point = EC_GROUP_get0_generator(group)) == NULL) {
507 ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, EC_R_UNDEFINED_GENERATOR);
511 form = EC_GROUP_get_point_conversion_form(group);
513 len = EC_POINT_point2buf(group, point, form, &buffer, NULL);
515 ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, ERR_R_EC_LIB);
518 if (ret->base == NULL && (ret->base = ASN1_OCTET_STRING_new()) == NULL) {
519 OPENSSL_free(buffer);
520 ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, ERR_R_MALLOC_FAILURE);
523 ASN1_STRING_set0(ret->base, buffer, len);
526 tmp = EC_GROUP_get0_order(group);
528 ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, ERR_R_EC_LIB);
531 ret->order = BN_to_ASN1_INTEGER(tmp, ret->order);
532 if (ret->order == NULL) {
533 ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, ERR_R_ASN1_LIB);
537 /* set the cofactor (optional) */
538 tmp = EC_GROUP_get0_cofactor(group);
540 ret->cofactor = BN_to_ASN1_INTEGER(tmp, ret->cofactor);
541 if (ret->cofactor == NULL) {
542 ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, ERR_R_ASN1_LIB);
551 ECPARAMETERS_free(ret);
555 ECPKPARAMETERS *EC_GROUP_get_ecpkparameters(const EC_GROUP *group,
556 ECPKPARAMETERS *params)
559 ECPKPARAMETERS *ret = params;
562 if ((ret = ECPKPARAMETERS_new()) == NULL) {
563 ECerr(EC_F_EC_GROUP_GET_ECPKPARAMETERS, ERR_R_MALLOC_FAILURE);
568 ASN1_OBJECT_free(ret->value.named_curve);
569 else if (ret->type == 1 && ret->value.parameters)
570 ECPARAMETERS_free(ret->value.parameters);
573 if (EC_GROUP_get_asn1_flag(group)) {
575 * use the asn1 OID to describe the elliptic curve parameters
577 tmp = EC_GROUP_get_curve_name(group);
580 if ((ret->value.named_curve = OBJ_nid2obj(tmp)) == NULL)
583 /* we don't know the nid => ERROR */
586 /* use the ECPARAMETERS structure */
588 if ((ret->value.parameters =
589 EC_GROUP_get_ecparameters(group, NULL)) == NULL)
594 ECPKPARAMETERS_free(ret);
600 EC_GROUP *EC_GROUP_new_from_ecparameters(const ECPARAMETERS *params)
603 EC_GROUP *ret = NULL;
604 BIGNUM *p = NULL, *a = NULL, *b = NULL;
605 EC_POINT *point = NULL;
608 if (!params->fieldID || !params->fieldID->fieldType ||
609 !params->fieldID->p.ptr) {
610 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_ASN1_ERROR);
614 /* now extract the curve parameters a and b */
615 if (!params->curve || !params->curve->a ||
616 !params->curve->a->data || !params->curve->b ||
617 !params->curve->b->data) {
618 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_ASN1_ERROR);
621 a = BN_bin2bn(params->curve->a->data, params->curve->a->length, NULL);
623 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_BN_LIB);
626 b = BN_bin2bn(params->curve->b->data, params->curve->b->length, NULL);
628 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_BN_LIB);
632 /* get the field parameters */
633 tmp = OBJ_obj2nid(params->fieldID->fieldType);
634 if (tmp == NID_X9_62_characteristic_two_field)
635 #ifdef OPENSSL_NO_EC2M
637 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_GF2M_NOT_SUPPORTED);
642 X9_62_CHARACTERISTIC_TWO *char_two;
644 char_two = params->fieldID->p.char_two;
646 field_bits = char_two->m;
647 if (field_bits > OPENSSL_ECC_MAX_FIELD_BITS) {
648 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_FIELD_TOO_LARGE);
652 if ((p = BN_new()) == NULL) {
653 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_MALLOC_FAILURE);
657 /* get the base type */
658 tmp = OBJ_obj2nid(char_two->type);
660 if (tmp == NID_X9_62_tpBasis) {
663 if (!char_two->p.tpBasis) {
664 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_ASN1_ERROR);
668 tmp_long = ASN1_INTEGER_get(char_two->p.tpBasis);
670 if (!(char_two->m > tmp_long && tmp_long > 0)) {
671 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS,
672 EC_R_INVALID_TRINOMIAL_BASIS);
676 /* create the polynomial */
677 if (!BN_set_bit(p, (int)char_two->m))
679 if (!BN_set_bit(p, (int)tmp_long))
681 if (!BN_set_bit(p, 0))
683 } else if (tmp == NID_X9_62_ppBasis) {
684 X9_62_PENTANOMIAL *penta;
686 penta = char_two->p.ppBasis;
688 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_ASN1_ERROR);
693 (char_two->m > penta->k3 && penta->k3 > penta->k2
694 && penta->k2 > penta->k1 && penta->k1 > 0)) {
695 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS,
696 EC_R_INVALID_PENTANOMIAL_BASIS);
700 /* create the polynomial */
701 if (!BN_set_bit(p, (int)char_two->m))
703 if (!BN_set_bit(p, (int)penta->k1))
705 if (!BN_set_bit(p, (int)penta->k2))
707 if (!BN_set_bit(p, (int)penta->k3))
709 if (!BN_set_bit(p, 0))
711 } else if (tmp == NID_X9_62_onBasis) {
712 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_NOT_IMPLEMENTED);
716 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_ASN1_ERROR);
720 /* create the EC_GROUP structure */
721 ret = EC_GROUP_new_curve_GF2m(p, a, b, NULL);
724 else if (tmp == NID_X9_62_prime_field) {
725 /* we have a curve over a prime field */
726 /* extract the prime number */
727 if (!params->fieldID->p.prime) {
728 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_ASN1_ERROR);
731 p = ASN1_INTEGER_to_BN(params->fieldID->p.prime, NULL);
733 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_ASN1_LIB);
737 if (BN_is_negative(p) || BN_is_zero(p)) {
738 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_INVALID_FIELD);
742 field_bits = BN_num_bits(p);
743 if (field_bits > OPENSSL_ECC_MAX_FIELD_BITS) {
744 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_FIELD_TOO_LARGE);
748 /* create the EC_GROUP structure */
749 ret = EC_GROUP_new_curve_GFp(p, a, b, NULL);
751 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_INVALID_FIELD);
756 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_EC_LIB);
760 /* extract seed (optional) */
761 if (params->curve->seed != NULL) {
762 OPENSSL_free(ret->seed);
763 if ((ret->seed = OPENSSL_malloc(params->curve->seed->length)) == NULL) {
764 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_MALLOC_FAILURE);
767 memcpy(ret->seed, params->curve->seed->data,
768 params->curve->seed->length);
769 ret->seed_len = params->curve->seed->length;
772 if (!params->order || !params->base || !params->base->data) {
773 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_ASN1_ERROR);
777 if ((point = EC_POINT_new(ret)) == NULL)
780 /* set the point conversion form */
781 EC_GROUP_set_point_conversion_form(ret, (point_conversion_form_t)
782 (params->base->data[0] & ~0x01));
784 /* extract the ec point */
785 if (!EC_POINT_oct2point(ret, point, params->base->data,
786 params->base->length, NULL)) {
787 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_EC_LIB);
791 /* extract the order */
792 if ((a = ASN1_INTEGER_to_BN(params->order, a)) == NULL) {
793 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_ASN1_LIB);
796 if (BN_is_negative(a) || BN_is_zero(a)) {
797 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_INVALID_GROUP_ORDER);
800 if (BN_num_bits(a) > (int)field_bits + 1) { /* Hasse bound */
801 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_INVALID_GROUP_ORDER);
805 /* extract the cofactor (optional) */
806 if (params->cofactor == NULL) {
809 } else if ((b = ASN1_INTEGER_to_BN(params->cofactor, b)) == NULL) {
810 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_ASN1_LIB);
813 /* set the generator, order and cofactor (if present) */
814 if (!EC_GROUP_set_generator(ret, point, a, b)) {
815 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_EC_LIB);
823 EC_GROUP_clear_free(ret);
830 EC_POINT_free(point);
834 EC_GROUP *EC_GROUP_new_from_ecpkparameters(const ECPKPARAMETERS *params)
836 EC_GROUP *ret = NULL;
839 if (params == NULL) {
840 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPKPARAMETERS, EC_R_MISSING_PARAMETERS);
844 if (params->type == 0) { /* the curve is given by an OID */
845 tmp = OBJ_obj2nid(params->value.named_curve);
846 if ((ret = EC_GROUP_new_by_curve_name(tmp)) == NULL) {
847 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPKPARAMETERS,
848 EC_R_EC_GROUP_NEW_BY_NAME_FAILURE);
851 EC_GROUP_set_asn1_flag(ret, OPENSSL_EC_NAMED_CURVE);
852 } else if (params->type == 1) { /* the parameters are given by a
853 * ECPARAMETERS structure */
854 ret = EC_GROUP_new_from_ecparameters(params->value.parameters);
856 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPKPARAMETERS, ERR_R_EC_LIB);
859 EC_GROUP_set_asn1_flag(ret, 0x0);
860 } else if (params->type == 2) { /* implicitlyCA */
863 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPKPARAMETERS, EC_R_ASN1_ERROR);
870 /* EC_GROUP <-> DER encoding of ECPKPARAMETERS */
872 EC_GROUP *d2i_ECPKParameters(EC_GROUP **a, const unsigned char **in, long len)
874 EC_GROUP *group = NULL;
875 ECPKPARAMETERS *params = NULL;
876 const unsigned char *p = *in;
878 if ((params = d2i_ECPKPARAMETERS(NULL, &p, len)) == NULL) {
879 ECerr(EC_F_D2I_ECPKPARAMETERS, EC_R_D2I_ECPKPARAMETERS_FAILURE);
880 ECPKPARAMETERS_free(params);
884 if ((group = EC_GROUP_new_from_ecpkparameters(params)) == NULL) {
885 ECerr(EC_F_D2I_ECPKPARAMETERS, EC_R_PKPARAMETERS2GROUP_FAILURE);
886 ECPKPARAMETERS_free(params);
891 EC_GROUP_clear_free(*a);
895 ECPKPARAMETERS_free(params);
900 int i2d_ECPKParameters(const EC_GROUP *a, unsigned char **out)
903 ECPKPARAMETERS *tmp = EC_GROUP_get_ecpkparameters(a, NULL);
905 ECerr(EC_F_I2D_ECPKPARAMETERS, EC_R_GROUP2PKPARAMETERS_FAILURE);
908 if ((ret = i2d_ECPKPARAMETERS(tmp, out)) == 0) {
909 ECerr(EC_F_I2D_ECPKPARAMETERS, EC_R_I2D_ECPKPARAMETERS_FAILURE);
910 ECPKPARAMETERS_free(tmp);
913 ECPKPARAMETERS_free(tmp);
917 /* some EC_KEY functions */
919 EC_KEY *d2i_ECPrivateKey(EC_KEY **a, const unsigned char **in, long len)
922 EC_PRIVATEKEY *priv_key = NULL;
923 const unsigned char *p = *in;
925 if ((priv_key = d2i_EC_PRIVATEKEY(NULL, &p, len)) == NULL) {
926 ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_EC_LIB);
930 if (a == NULL || *a == NULL) {
931 if ((ret = EC_KEY_new()) == NULL) {
932 ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_MALLOC_FAILURE);
938 if (priv_key->parameters) {
939 EC_GROUP_clear_free(ret->group);
940 ret->group = EC_GROUP_new_from_ecpkparameters(priv_key->parameters);
943 if (ret->group == NULL) {
944 ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_EC_LIB);
948 ret->version = priv_key->version;
950 if (priv_key->privateKey) {
951 ASN1_OCTET_STRING *pkey = priv_key->privateKey;
952 if (EC_KEY_oct2priv(ret, ASN1_STRING_get0_data(pkey),
953 ASN1_STRING_length(pkey)) == 0)
956 ECerr(EC_F_D2I_ECPRIVATEKEY, EC_R_MISSING_PRIVATE_KEY);
960 EC_POINT_clear_free(ret->pub_key);
961 ret->pub_key = EC_POINT_new(ret->group);
962 if (ret->pub_key == NULL) {
963 ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_EC_LIB);
967 if (priv_key->publicKey) {
968 const unsigned char *pub_oct;
971 pub_oct = ASN1_STRING_get0_data(priv_key->publicKey);
972 pub_oct_len = ASN1_STRING_length(priv_key->publicKey);
973 if (!EC_KEY_oct2key(ret, pub_oct, pub_oct_len, NULL)) {
974 ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_EC_LIB);
978 if (ret->group->meth->keygenpub == NULL
979 || ret->group->meth->keygenpub(ret) == 0)
981 /* Remember the original private-key-only encoding. */
982 ret->enc_flag |= EC_PKEY_NO_PUBKEY;
987 EC_PRIVATEKEY_free(priv_key);
992 if (a == NULL || *a != ret)
994 EC_PRIVATEKEY_free(priv_key);
998 int i2d_ECPrivateKey(EC_KEY *a, unsigned char **out)
1000 int ret = 0, ok = 0;
1001 unsigned char *priv= NULL, *pub= NULL;
1002 size_t privlen = 0, publen = 0;
1004 EC_PRIVATEKEY *priv_key = NULL;
1006 if (a == NULL || a->group == NULL ||
1007 (!(a->enc_flag & EC_PKEY_NO_PUBKEY) && a->pub_key == NULL)) {
1008 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_PASSED_NULL_PARAMETER);
1012 if ((priv_key = EC_PRIVATEKEY_new()) == NULL) {
1013 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_MALLOC_FAILURE);
1017 priv_key->version = a->version;
1019 privlen = EC_KEY_priv2buf(a, &priv);
1022 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_EC_LIB);
1026 ASN1_STRING_set0(priv_key->privateKey, priv, privlen);
1029 if (!(a->enc_flag & EC_PKEY_NO_PARAMETERS)) {
1030 if ((priv_key->parameters =
1031 EC_GROUP_get_ecpkparameters(a->group,
1032 priv_key->parameters)) == NULL) {
1033 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_EC_LIB);
1038 if (!(a->enc_flag & EC_PKEY_NO_PUBKEY)) {
1039 priv_key->publicKey = ASN1_BIT_STRING_new();
1040 if (priv_key->publicKey == NULL) {
1041 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_MALLOC_FAILURE);
1045 publen = EC_KEY_key2buf(a, a->conv_form, &pub, NULL);
1048 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_EC_LIB);
1052 priv_key->publicKey->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07);
1053 priv_key->publicKey->flags |= ASN1_STRING_FLAG_BITS_LEFT;
1054 ASN1_STRING_set0(priv_key->publicKey, pub, publen);
1058 if ((ret = i2d_EC_PRIVATEKEY(priv_key, out)) == 0) {
1059 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_EC_LIB);
1064 OPENSSL_clear_free(priv, privlen);
1066 EC_PRIVATEKEY_free(priv_key);
1067 return (ok ? ret : 0);
1070 int i2d_ECParameters(EC_KEY *a, unsigned char **out)
1073 ECerr(EC_F_I2D_ECPARAMETERS, ERR_R_PASSED_NULL_PARAMETER);
1076 return i2d_ECPKParameters(a->group, out);
1079 EC_KEY *d2i_ECParameters(EC_KEY **a, const unsigned char **in, long len)
1083 if (in == NULL || *in == NULL) {
1084 ECerr(EC_F_D2I_ECPARAMETERS, ERR_R_PASSED_NULL_PARAMETER);
1088 if (a == NULL || *a == NULL) {
1089 if ((ret = EC_KEY_new()) == NULL) {
1090 ECerr(EC_F_D2I_ECPARAMETERS, ERR_R_MALLOC_FAILURE);
1096 if (!d2i_ECPKParameters(&ret->group, in, len)) {
1097 ECerr(EC_F_D2I_ECPARAMETERS, ERR_R_EC_LIB);
1098 if (a == NULL || *a != ret)
1109 EC_KEY *o2i_ECPublicKey(EC_KEY **a, const unsigned char **in, long len)
1113 if (a == NULL || (*a) == NULL || (*a)->group == NULL) {
1115 * sorry, but a EC_GROUP-structure is necessary to set the public key
1117 ECerr(EC_F_O2I_ECPUBLICKEY, ERR_R_PASSED_NULL_PARAMETER);
1121 if (!EC_KEY_oct2key(ret, *in, len, NULL)) {
1122 ECerr(EC_F_O2I_ECPUBLICKEY, ERR_R_EC_LIB);
1129 int i2o_ECPublicKey(const EC_KEY *a, unsigned char **out)
1135 ECerr(EC_F_I2O_ECPUBLICKEY, ERR_R_PASSED_NULL_PARAMETER);
1139 buf_len = EC_POINT_point2oct(a->group, a->pub_key,
1140 a->conv_form, NULL, 0, NULL);
1142 if (out == NULL || buf_len == 0)
1143 /* out == NULL => just return the length of the octet string */
1147 if ((*out = OPENSSL_malloc(buf_len)) == NULL) {
1148 ECerr(EC_F_I2O_ECPUBLICKEY, ERR_R_MALLOC_FAILURE);
1153 if (!EC_POINT_point2oct(a->group, a->pub_key, a->conv_form,
1154 *out, buf_len, NULL)) {
1155 ECerr(EC_F_I2O_ECPUBLICKEY, ERR_R_EC_LIB);
1167 ASN1_SEQUENCE(ECDSA_SIG) = {
1168 ASN1_SIMPLE(ECDSA_SIG, r, CBIGNUM),
1169 ASN1_SIMPLE(ECDSA_SIG, s, CBIGNUM)
1170 } static_ASN1_SEQUENCE_END(ECDSA_SIG)
1172 DECLARE_ASN1_FUNCTIONS_const(ECDSA_SIG)
1173 DECLARE_ASN1_ENCODE_FUNCTIONS_const(ECDSA_SIG, ECDSA_SIG)
1174 IMPLEMENT_ASN1_ENCODE_FUNCTIONS_const_fname(ECDSA_SIG, ECDSA_SIG, ECDSA_SIG)
1176 ECDSA_SIG *ECDSA_SIG_new(void)
1178 ECDSA_SIG *sig = OPENSSL_zalloc(sizeof(*sig));
1180 ECerr(EC_F_ECDSA_SIG_NEW, ERR_R_MALLOC_FAILURE);
1184 void ECDSA_SIG_free(ECDSA_SIG *sig)
1188 BN_clear_free(sig->r);
1189 BN_clear_free(sig->s);
1193 void ECDSA_SIG_get0(const ECDSA_SIG *sig, const BIGNUM **pr, const BIGNUM **ps)
1201 int ECDSA_SIG_set0(ECDSA_SIG *sig, BIGNUM *r, BIGNUM *s)
1203 if (r == NULL || s == NULL)
1205 BN_clear_free(sig->r);
1206 BN_clear_free(sig->s);
1212 int ECDSA_size(const EC_KEY *r)
1216 unsigned char buf[4];
1217 const EC_GROUP *group;
1221 group = EC_KEY_get0_group(r);
1225 i = EC_GROUP_order_bits(group);
1228 bs.length = (i + 7) / 8;
1230 bs.type = V_ASN1_INTEGER;
1231 /* If the top bit is set the asn1 encoding is 1 larger. */
1234 i = i2d_ASN1_INTEGER(&bs, NULL);
1235 i += i; /* r and s */
1236 ret = ASN1_object_size(1, i, V_ASN1_SEQUENCE);