1 /* crypto/ec/ec_asn1.c */
3 * Written by Nils Larsch for the OpenSSL project.
5 /* ====================================================================
6 * Copyright (c) 2000-2003 The OpenSSL Project. All rights reserved.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in
17 * the documentation and/or other materials provided with the
20 * 3. All advertising materials mentioning features or use of this
21 * software must display the following acknowledgment:
22 * "This product includes software developed by the OpenSSL Project
23 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
25 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
26 * endorse or promote products derived from this software without
27 * prior written permission. For written permission, please contact
28 * licensing@OpenSSL.org.
30 * 5. Products derived from this software may not be called "OpenSSL"
31 * nor may "OpenSSL" appear in their names without prior written
32 * permission of the OpenSSL Project.
34 * 6. Redistributions of any form whatsoever must retain the following
36 * "This product includes software developed by the OpenSSL Project
37 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
39 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
40 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
41 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
42 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
43 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
44 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
45 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
46 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
48 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
49 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
50 * OF THE POSSIBILITY OF SUCH DAMAGE.
51 * ====================================================================
53 * This product includes cryptographic software written by Eric Young
54 * (eay@cryptsoft.com). This product includes software written by Tim
55 * Hudson (tjh@cryptsoft.com).
61 #include <openssl/err.h>
62 #include <openssl/asn1t.h>
63 #include <openssl/objects.h>
66 int EC_GROUP_get_basis_type(const EC_GROUP *group)
70 if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
71 NID_X9_62_characteristic_two_field)
72 /* everything else is currently not supported */
75 while (group->poly[i] != 0)
79 return NID_X9_62_ppBasis;
81 return NID_X9_62_tpBasis;
83 /* everything else is currently not supported */
86 #ifndef OPENSSL_NO_EC2M
87 int EC_GROUP_get_trinomial_basis(const EC_GROUP *group, unsigned int *k)
92 if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
93 NID_X9_62_characteristic_two_field
94 || !((group->poly[0] != 0) && (group->poly[1] != 0) && (group->poly[2] == 0)))
96 ECerr(EC_F_EC_GROUP_GET_TRINOMIAL_BASIS, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
105 int EC_GROUP_get_pentanomial_basis(const EC_GROUP *group, unsigned int *k1,
106 unsigned int *k2, unsigned int *k3)
111 if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
112 NID_X9_62_characteristic_two_field
113 || !((group->poly[0] != 0) && (group->poly[1] != 0) && (group->poly[2] != 0) && (group->poly[3] != 0) && (group->poly[4] == 0)))
115 ECerr(EC_F_EC_GROUP_GET_PENTANOMIAL_BASIS, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
120 *k1 = group->poly[3];
122 *k2 = group->poly[2];
124 *k3 = group->poly[1];
131 /* some structures needed for the asn1 encoding */
132 typedef struct x9_62_pentanomial_st {
138 typedef struct x9_62_characteristic_two_st {
143 /* NID_X9_62_onBasis */
145 /* NID_X9_62_tpBasis */
146 ASN1_INTEGER *tpBasis;
147 /* NID_X9_62_ppBasis */
148 X9_62_PENTANOMIAL *ppBasis;
152 } X9_62_CHARACTERISTIC_TWO;
154 typedef struct x9_62_fieldid_st {
155 ASN1_OBJECT *fieldType;
158 /* NID_X9_62_prime_field */
160 /* NID_X9_62_characteristic_two_field */
161 X9_62_CHARACTERISTIC_TWO *char_two;
167 typedef struct x9_62_curve_st {
168 ASN1_OCTET_STRING *a;
169 ASN1_OCTET_STRING *b;
170 ASN1_BIT_STRING *seed;
173 typedef struct ec_parameters_st {
175 X9_62_FIELDID *fieldID;
177 ASN1_OCTET_STRING *base;
179 ASN1_INTEGER *cofactor;
182 struct ecpk_parameters_st {
185 ASN1_OBJECT *named_curve;
186 ECPARAMETERS *parameters;
187 ASN1_NULL *implicitlyCA;
189 }/* ECPKPARAMETERS */;
191 /* SEC1 ECPrivateKey */
192 typedef struct ec_privatekey_st {
194 ASN1_OCTET_STRING *privateKey;
195 ECPKPARAMETERS *parameters;
196 ASN1_BIT_STRING *publicKey;
199 /* the OpenSSL ASN.1 definitions */
200 ASN1_SEQUENCE(X9_62_PENTANOMIAL) = {
201 ASN1_SIMPLE(X9_62_PENTANOMIAL, k1, LONG),
202 ASN1_SIMPLE(X9_62_PENTANOMIAL, k2, LONG),
203 ASN1_SIMPLE(X9_62_PENTANOMIAL, k3, LONG)
204 } ASN1_SEQUENCE_END(X9_62_PENTANOMIAL)
206 DECLARE_ASN1_ALLOC_FUNCTIONS(X9_62_PENTANOMIAL)
207 IMPLEMENT_ASN1_ALLOC_FUNCTIONS(X9_62_PENTANOMIAL)
209 ASN1_ADB_TEMPLATE(char_two_def) = ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, p.other, ASN1_ANY);
211 ASN1_ADB(X9_62_CHARACTERISTIC_TWO) = {
212 ADB_ENTRY(NID_X9_62_onBasis, ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, p.onBasis, ASN1_NULL)),
213 ADB_ENTRY(NID_X9_62_tpBasis, ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, p.tpBasis, ASN1_INTEGER)),
214 ADB_ENTRY(NID_X9_62_ppBasis, ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, p.ppBasis, X9_62_PENTANOMIAL))
215 } ASN1_ADB_END(X9_62_CHARACTERISTIC_TWO, 0, type, 0, &char_two_def_tt, NULL);
217 ASN1_SEQUENCE(X9_62_CHARACTERISTIC_TWO) = {
218 ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, m, LONG),
219 ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, type, ASN1_OBJECT),
220 ASN1_ADB_OBJECT(X9_62_CHARACTERISTIC_TWO)
221 } ASN1_SEQUENCE_END(X9_62_CHARACTERISTIC_TWO)
223 DECLARE_ASN1_ALLOC_FUNCTIONS(X9_62_CHARACTERISTIC_TWO)
224 IMPLEMENT_ASN1_ALLOC_FUNCTIONS(X9_62_CHARACTERISTIC_TWO)
226 ASN1_ADB_TEMPLATE(fieldID_def) = ASN1_SIMPLE(X9_62_FIELDID, p.other, ASN1_ANY);
228 ASN1_ADB(X9_62_FIELDID) = {
229 ADB_ENTRY(NID_X9_62_prime_field, ASN1_SIMPLE(X9_62_FIELDID, p.prime, ASN1_INTEGER)),
230 ADB_ENTRY(NID_X9_62_characteristic_two_field, ASN1_SIMPLE(X9_62_FIELDID, p.char_two, X9_62_CHARACTERISTIC_TWO))
231 } ASN1_ADB_END(X9_62_FIELDID, 0, fieldType, 0, &fieldID_def_tt, NULL);
233 ASN1_SEQUENCE(X9_62_FIELDID) = {
234 ASN1_SIMPLE(X9_62_FIELDID, fieldType, ASN1_OBJECT),
235 ASN1_ADB_OBJECT(X9_62_FIELDID)
236 } ASN1_SEQUENCE_END(X9_62_FIELDID)
238 ASN1_SEQUENCE(X9_62_CURVE) = {
239 ASN1_SIMPLE(X9_62_CURVE, a, ASN1_OCTET_STRING),
240 ASN1_SIMPLE(X9_62_CURVE, b, ASN1_OCTET_STRING),
241 ASN1_OPT(X9_62_CURVE, seed, ASN1_BIT_STRING)
242 } ASN1_SEQUENCE_END(X9_62_CURVE)
244 ASN1_SEQUENCE(ECPARAMETERS) = {
245 ASN1_SIMPLE(ECPARAMETERS, version, LONG),
246 ASN1_SIMPLE(ECPARAMETERS, fieldID, X9_62_FIELDID),
247 ASN1_SIMPLE(ECPARAMETERS, curve, X9_62_CURVE),
248 ASN1_SIMPLE(ECPARAMETERS, base, ASN1_OCTET_STRING),
249 ASN1_SIMPLE(ECPARAMETERS, order, ASN1_INTEGER),
250 ASN1_OPT(ECPARAMETERS, cofactor, ASN1_INTEGER)
251 } ASN1_SEQUENCE_END(ECPARAMETERS)
253 DECLARE_ASN1_ALLOC_FUNCTIONS(ECPARAMETERS)
254 IMPLEMENT_ASN1_ALLOC_FUNCTIONS(ECPARAMETERS)
256 ASN1_CHOICE(ECPKPARAMETERS) = {
257 ASN1_SIMPLE(ECPKPARAMETERS, value.named_curve, ASN1_OBJECT),
258 ASN1_SIMPLE(ECPKPARAMETERS, value.parameters, ECPARAMETERS),
259 ASN1_SIMPLE(ECPKPARAMETERS, value.implicitlyCA, ASN1_NULL)
260 } ASN1_CHOICE_END(ECPKPARAMETERS)
262 DECLARE_ASN1_FUNCTIONS_const(ECPKPARAMETERS)
263 DECLARE_ASN1_ENCODE_FUNCTIONS_const(ECPKPARAMETERS, ECPKPARAMETERS)
264 IMPLEMENT_ASN1_FUNCTIONS_const(ECPKPARAMETERS)
266 ASN1_SEQUENCE(EC_PRIVATEKEY) = {
267 ASN1_SIMPLE(EC_PRIVATEKEY, version, LONG),
268 ASN1_SIMPLE(EC_PRIVATEKEY, privateKey, ASN1_OCTET_STRING),
269 ASN1_EXP_OPT(EC_PRIVATEKEY, parameters, ECPKPARAMETERS, 0),
270 ASN1_EXP_OPT(EC_PRIVATEKEY, publicKey, ASN1_BIT_STRING, 1)
271 } ASN1_SEQUENCE_END(EC_PRIVATEKEY)
273 DECLARE_ASN1_FUNCTIONS_const(EC_PRIVATEKEY)
274 DECLARE_ASN1_ENCODE_FUNCTIONS_const(EC_PRIVATEKEY, EC_PRIVATEKEY)
275 IMPLEMENT_ASN1_FUNCTIONS_const(EC_PRIVATEKEY)
277 /* some declarations of internal function */
279 /* ec_asn1_group2field() sets the values in a X9_62_FIELDID object */
280 static int ec_asn1_group2fieldid(const EC_GROUP *, X9_62_FIELDID *);
281 /* ec_asn1_group2curve() sets the values in a X9_62_CURVE object */
282 static int ec_asn1_group2curve(const EC_GROUP *, X9_62_CURVE *);
283 /* ec_asn1_parameters2group() creates a EC_GROUP object from a
284 * ECPARAMETERS object */
285 static EC_GROUP *ec_asn1_parameters2group(const ECPARAMETERS *);
286 /* ec_asn1_group2parameters() creates a ECPARAMETERS object from a
288 static ECPARAMETERS *ec_asn1_group2parameters(const EC_GROUP *,ECPARAMETERS *);
289 /* ec_asn1_pkparameters2group() creates a EC_GROUP object from a
290 * ECPKPARAMETERS object */
291 static EC_GROUP *ec_asn1_pkparameters2group(const ECPKPARAMETERS *);
292 /* ec_asn1_group2pkparameters() creates a ECPKPARAMETERS object from a
294 static ECPKPARAMETERS *ec_asn1_group2pkparameters(const EC_GROUP *,
298 /* the function definitions */
300 static int ec_asn1_group2fieldid(const EC_GROUP *group, X9_62_FIELDID *field)
305 if (group == NULL || field == NULL)
308 /* clear the old values (if necessary) */
309 if (field->fieldType != NULL)
310 ASN1_OBJECT_free(field->fieldType);
311 if (field->p.other != NULL)
312 ASN1_TYPE_free(field->p.other);
314 nid = EC_METHOD_get_field_type(EC_GROUP_method_of(group));
315 /* set OID for the field */
316 if ((field->fieldType = OBJ_nid2obj(nid)) == NULL)
318 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_OBJ_LIB);
322 if (nid == NID_X9_62_prime_field)
324 if ((tmp = BN_new()) == NULL)
326 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE);
329 /* the parameters are specified by the prime number p */
330 if (!EC_GROUP_get_curve_GFp(group, tmp, NULL, NULL, NULL))
332 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_EC_LIB);
335 /* set the prime number */
336 field->p.prime = BN_to_ASN1_INTEGER(tmp,NULL);
337 if (field->p.prime == NULL)
339 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_ASN1_LIB);
343 else /* nid == NID_X9_62_characteristic_two_field */
344 #ifdef OPENSSL_NO_EC2M
346 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, EC_R_GF2M_NOT_SUPPORTED);
352 X9_62_CHARACTERISTIC_TWO *char_two;
354 field->p.char_two = X9_62_CHARACTERISTIC_TWO_new();
355 char_two = field->p.char_two;
357 if (char_two == NULL)
359 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE);
363 char_two->m = (long)EC_GROUP_get_degree(group);
365 field_type = EC_GROUP_get_basis_type(group);
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)
375 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_OBJ_LIB);
379 if (field_type == NID_X9_62_tpBasis)
383 if (!EC_GROUP_get_trinomial_basis(group, &k))
386 char_two->p.tpBasis = ASN1_INTEGER_new();
387 if (!char_two->p.tpBasis)
389 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE);
392 if (!ASN1_INTEGER_set(char_two->p.tpBasis, (long)k))
394 ECerr(EC_F_EC_ASN1_GROUP2FIELDID,
399 else if (field_type == NID_X9_62_ppBasis)
401 unsigned int k1, k2, k3;
403 if (!EC_GROUP_get_pentanomial_basis(group, &k1, &k2, &k3))
406 char_two->p.ppBasis = X9_62_PENTANOMIAL_new();
407 if (!char_two->p.ppBasis)
409 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE);
414 char_two->p.ppBasis->k1 = (long)k1;
415 char_two->p.ppBasis->k2 = (long)k2;
416 char_two->p.ppBasis->k3 = (long)k3;
418 else /* field_type == NID_X9_62_onBasis */
420 /* for ONB the parameters are (asn1) NULL */
421 char_two->p.onBasis = ASN1_NULL_new();
422 if (!char_two->p.onBasis)
424 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE);
438 static int ec_asn1_group2curve(const EC_GROUP *group, X9_62_CURVE *curve)
441 BIGNUM *tmp_1=NULL, *tmp_2=NULL;
442 unsigned char *buffer_1=NULL, *buffer_2=NULL,
443 *a_buf=NULL, *b_buf=NULL;
445 unsigned char char_zero = 0;
447 if (!group || !curve || !curve->a || !curve->b)
450 if ((tmp_1 = BN_new()) == NULL || (tmp_2 = BN_new()) == NULL)
452 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_MALLOC_FAILURE);
456 nid = EC_METHOD_get_field_type(EC_GROUP_method_of(group));
459 if (nid == NID_X9_62_prime_field)
461 if (!EC_GROUP_get_curve_GFp(group, NULL, tmp_1, tmp_2, NULL))
463 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_EC_LIB);
467 #ifndef OPENSSL_NO_EC2M
468 else /* nid == NID_X9_62_characteristic_two_field */
470 if (!EC_GROUP_get_curve_GF2m(group, NULL, tmp_1, tmp_2, NULL))
472 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_EC_LIB);
477 len_1 = (size_t)BN_num_bytes(tmp_1);
478 len_2 = (size_t)BN_num_bytes(tmp_2);
482 /* len_1 == 0 => a == 0 */
488 if ((buffer_1 = OPENSSL_malloc(len_1)) == NULL)
490 ECerr(EC_F_EC_ASN1_GROUP2CURVE,
491 ERR_R_MALLOC_FAILURE);
494 if ( (len_1 = BN_bn2bin(tmp_1, buffer_1)) == 0)
496 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_BN_LIB);
504 /* len_2 == 0 => b == 0 */
510 if ((buffer_2 = OPENSSL_malloc(len_2)) == NULL)
512 ECerr(EC_F_EC_ASN1_GROUP2CURVE,
513 ERR_R_MALLOC_FAILURE);
516 if ( (len_2 = BN_bn2bin(tmp_2, buffer_2)) == 0)
518 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_BN_LIB);
525 if (!M_ASN1_OCTET_STRING_set(curve->a, a_buf, len_1) ||
526 !M_ASN1_OCTET_STRING_set(curve->b, b_buf, len_2))
528 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_ASN1_LIB);
532 /* set the seed (optional) */
536 if ((curve->seed = ASN1_BIT_STRING_new()) == NULL)
538 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_MALLOC_FAILURE);
541 curve->seed->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT|0x07);
542 curve->seed->flags |= ASN1_STRING_FLAG_BITS_LEFT;
543 if (!ASN1_BIT_STRING_set(curve->seed, group->seed,
544 (int)group->seed_len))
546 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_ASN1_LIB);
554 ASN1_BIT_STRING_free(curve->seed);
562 OPENSSL_free(buffer_1);
564 OPENSSL_free(buffer_2);
572 static ECPARAMETERS *ec_asn1_group2parameters(const EC_GROUP *group,
577 ECPARAMETERS *ret=NULL;
579 unsigned char *buffer=NULL;
580 const EC_POINT *point=NULL;
581 point_conversion_form_t form;
583 if ((tmp = BN_new()) == NULL)
585 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_MALLOC_FAILURE);
591 if ((ret = ECPARAMETERS_new()) == NULL)
593 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS,
594 ERR_R_MALLOC_FAILURE);
601 /* set the version (always one) */
602 ret->version = (long)0x1;
604 /* set the fieldID */
605 if (!ec_asn1_group2fieldid(group, ret->fieldID))
607 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_EC_LIB);
612 if (!ec_asn1_group2curve(group, ret->curve))
614 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_EC_LIB);
618 /* set the base point */
619 if ((point = EC_GROUP_get0_generator(group)) == NULL)
621 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, EC_R_UNDEFINED_GENERATOR);
625 form = EC_GROUP_get_point_conversion_form(group);
627 len = EC_POINT_point2oct(group, point, form, NULL, len, NULL);
630 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_EC_LIB);
633 if ((buffer = OPENSSL_malloc(len)) == NULL)
635 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_MALLOC_FAILURE);
638 if (!EC_POINT_point2oct(group, point, form, buffer, len, NULL))
640 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_EC_LIB);
643 if (ret->base == NULL && (ret->base = ASN1_OCTET_STRING_new()) == NULL)
645 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_MALLOC_FAILURE);
648 if (!ASN1_OCTET_STRING_set(ret->base, buffer, len))
650 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_ASN1_LIB);
655 if (!EC_GROUP_get_order(group, tmp, NULL))
657 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_EC_LIB);
660 ret->order = BN_to_ASN1_INTEGER(tmp, ret->order);
661 if (ret->order == NULL)
663 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_ASN1_LIB);
667 /* set the cofactor (optional) */
668 if (EC_GROUP_get_cofactor(group, tmp, NULL))
670 ret->cofactor = BN_to_ASN1_INTEGER(tmp, ret->cofactor);
671 if (ret->cofactor == NULL)
673 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_ASN1_LIB);
683 ECPARAMETERS_free(ret);
689 OPENSSL_free(buffer);
693 ECPKPARAMETERS *ec_asn1_group2pkparameters(const EC_GROUP *group,
694 ECPKPARAMETERS *params)
697 ECPKPARAMETERS *ret = params;
701 if ((ret = ECPKPARAMETERS_new()) == NULL)
703 ECerr(EC_F_EC_ASN1_GROUP2PKPARAMETERS,
704 ERR_R_MALLOC_FAILURE);
710 if (ret->type == 0 && ret->value.named_curve)
711 ASN1_OBJECT_free(ret->value.named_curve);
712 else if (ret->type == 1 && ret->value.parameters)
713 ECPARAMETERS_free(ret->value.parameters);
716 if (EC_GROUP_get_asn1_flag(group))
718 /* use the asn1 OID to describe the
719 * the elliptic curve parameters
721 tmp = EC_GROUP_get_curve_name(group);
725 if ((ret->value.named_curve = OBJ_nid2obj(tmp)) == NULL)
729 /* we don't kmow the nid => ERROR */
734 /* use the ECPARAMETERS structure */
736 if ((ret->value.parameters = ec_asn1_group2parameters(
737 group, NULL)) == NULL)
743 ECPKPARAMETERS_free(ret);
749 static EC_GROUP *ec_asn1_parameters2group(const ECPARAMETERS *params)
752 EC_GROUP *ret = NULL;
753 BIGNUM *p = NULL, *a = NULL, *b = NULL;
754 EC_POINT *point=NULL;
757 if (!params->fieldID || !params->fieldID->fieldType ||
758 !params->fieldID->p.ptr)
760 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_ASN1_ERROR);
764 /* now extract the curve parameters a and b */
765 if (!params->curve || !params->curve->a ||
766 !params->curve->a->data || !params->curve->b ||
767 !params->curve->b->data)
769 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_ASN1_ERROR);
772 a = BN_bin2bn(params->curve->a->data, params->curve->a->length, NULL);
775 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_BN_LIB);
778 b = BN_bin2bn(params->curve->b->data, params->curve->b->length, NULL);
781 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_BN_LIB);
785 /* get the field parameters */
786 tmp = OBJ_obj2nid(params->fieldID->fieldType);
787 if (tmp == NID_X9_62_characteristic_two_field)
788 #ifdef OPENSSL_NO_EC2M
790 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_GF2M_NOT_SUPPORTED);
795 X9_62_CHARACTERISTIC_TWO *char_two;
797 char_two = params->fieldID->p.char_two;
799 field_bits = char_two->m;
800 if (field_bits > OPENSSL_ECC_MAX_FIELD_BITS)
802 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_FIELD_TOO_LARGE);
806 if ((p = BN_new()) == NULL)
808 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_MALLOC_FAILURE);
812 /* get the base type */
813 tmp = OBJ_obj2nid(char_two->type);
815 if (tmp == NID_X9_62_tpBasis)
819 if (!char_two->p.tpBasis)
821 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_ASN1_ERROR);
825 tmp_long = ASN1_INTEGER_get(char_two->p.tpBasis);
827 if (!(char_two->m > tmp_long && tmp_long > 0))
829 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_INVALID_TRINOMIAL_BASIS);
833 /* create the polynomial */
834 if (!BN_set_bit(p, (int)char_two->m))
836 if (!BN_set_bit(p, (int)tmp_long))
838 if (!BN_set_bit(p, 0))
841 else if (tmp == NID_X9_62_ppBasis)
843 X9_62_PENTANOMIAL *penta;
845 penta = char_two->p.ppBasis;
848 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_ASN1_ERROR);
852 if (!(char_two->m > penta->k3 && penta->k3 > penta->k2 && penta->k2 > penta->k1 && penta->k1 > 0))
854 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_INVALID_PENTANOMIAL_BASIS);
858 /* create the polynomial */
859 if (!BN_set_bit(p, (int)char_two->m)) goto err;
860 if (!BN_set_bit(p, (int)penta->k1)) goto err;
861 if (!BN_set_bit(p, (int)penta->k2)) goto err;
862 if (!BN_set_bit(p, (int)penta->k3)) goto err;
863 if (!BN_set_bit(p, 0)) goto err;
865 else if (tmp == NID_X9_62_onBasis)
867 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_NOT_IMPLEMENTED);
872 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_ASN1_ERROR);
876 /* create the EC_GROUP structure */
877 ret = EC_GROUP_new_curve_GF2m(p, a, b, NULL);
880 else if (tmp == NID_X9_62_prime_field)
882 /* we have a curve over a prime field */
883 /* extract the prime number */
884 if (!params->fieldID->p.prime)
886 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_ASN1_ERROR);
889 p = ASN1_INTEGER_to_BN(params->fieldID->p.prime, NULL);
892 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_ASN1_LIB);
896 if (BN_is_negative(p) || BN_is_zero(p))
898 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_INVALID_FIELD);
902 field_bits = BN_num_bits(p);
903 if (field_bits > OPENSSL_ECC_MAX_FIELD_BITS)
905 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_FIELD_TOO_LARGE);
909 /* create the EC_GROUP structure */
910 ret = EC_GROUP_new_curve_GFp(p, a, b, NULL);
914 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_INVALID_FIELD);
920 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_EC_LIB);
924 /* extract seed (optional) */
925 if (params->curve->seed != NULL)
927 if (ret->seed != NULL)
928 OPENSSL_free(ret->seed);
929 if (!(ret->seed = OPENSSL_malloc(params->curve->seed->length)))
931 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP,
932 ERR_R_MALLOC_FAILURE);
935 memcpy(ret->seed, params->curve->seed->data,
936 params->curve->seed->length);
937 ret->seed_len = params->curve->seed->length;
940 if (!params->order || !params->base || !params->base->data)
942 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_ASN1_ERROR);
946 if ((point = EC_POINT_new(ret)) == NULL) goto err;
948 /* set the point conversion form */
949 EC_GROUP_set_point_conversion_form(ret, (point_conversion_form_t)
950 (params->base->data[0] & ~0x01));
952 /* extract the ec point */
953 if (!EC_POINT_oct2point(ret, point, params->base->data,
954 params->base->length, NULL))
956 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_EC_LIB);
960 /* extract the order */
961 if ((a = ASN1_INTEGER_to_BN(params->order, a)) == NULL)
963 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_ASN1_LIB);
966 if (BN_is_negative(a) || BN_is_zero(a))
968 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_INVALID_GROUP_ORDER);
971 if (BN_num_bits(a) > (int)field_bits + 1) /* Hasse bound */
973 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_INVALID_GROUP_ORDER);
977 /* extract the cofactor (optional) */
978 if (params->cofactor == NULL)
987 if ((b = ASN1_INTEGER_to_BN(params->cofactor, b)) == NULL)
989 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_ASN1_LIB);
992 /* set the generator, order and cofactor (if present) */
993 if (!EC_GROUP_set_generator(ret, point, a, b))
995 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_EC_LIB);
1004 EC_GROUP_clear_free(ret);
1015 EC_POINT_free(point);
1019 EC_GROUP *ec_asn1_pkparameters2group(const ECPKPARAMETERS *params)
1026 ECerr(EC_F_EC_ASN1_PKPARAMETERS2GROUP,
1027 EC_R_MISSING_PARAMETERS);
1031 if (params->type == 0)
1032 { /* the curve is given by an OID */
1033 tmp = OBJ_obj2nid(params->value.named_curve);
1034 if ((ret = EC_GROUP_new_by_curve_name(tmp)) == NULL)
1036 ECerr(EC_F_EC_ASN1_PKPARAMETERS2GROUP,
1037 EC_R_EC_GROUP_NEW_BY_NAME_FAILURE);
1040 EC_GROUP_set_asn1_flag(ret, OPENSSL_EC_NAMED_CURVE);
1042 else if (params->type == 1)
1043 { /* the parameters are given by a ECPARAMETERS
1045 ret = ec_asn1_parameters2group(params->value.parameters);
1048 ECerr(EC_F_EC_ASN1_PKPARAMETERS2GROUP, ERR_R_EC_LIB);
1051 EC_GROUP_set_asn1_flag(ret, 0x0);
1053 else if (params->type == 2)
1054 { /* implicitlyCA */
1059 ECerr(EC_F_EC_ASN1_PKPARAMETERS2GROUP, EC_R_ASN1_ERROR);
1066 /* EC_GROUP <-> DER encoding of ECPKPARAMETERS */
1068 EC_GROUP *d2i_ECPKParameters(EC_GROUP **a, const unsigned char **in, long len)
1070 EC_GROUP *group = NULL;
1071 ECPKPARAMETERS *params = NULL;
1073 if ((params = d2i_ECPKPARAMETERS(NULL, in, len)) == NULL)
1075 ECerr(EC_F_D2I_ECPKPARAMETERS, EC_R_D2I_ECPKPARAMETERS_FAILURE);
1076 ECPKPARAMETERS_free(params);
1080 if ((group = ec_asn1_pkparameters2group(params)) == NULL)
1082 ECerr(EC_F_D2I_ECPKPARAMETERS, EC_R_PKPARAMETERS2GROUP_FAILURE);
1083 ECPKPARAMETERS_free(params);
1089 EC_GROUP_clear_free(*a);
1093 ECPKPARAMETERS_free(params);
1097 int i2d_ECPKParameters(const EC_GROUP *a, unsigned char **out)
1100 ECPKPARAMETERS *tmp = ec_asn1_group2pkparameters(a, NULL);
1103 ECerr(EC_F_I2D_ECPKPARAMETERS, EC_R_GROUP2PKPARAMETERS_FAILURE);
1106 if ((ret = i2d_ECPKPARAMETERS(tmp, out)) == 0)
1108 ECerr(EC_F_I2D_ECPKPARAMETERS, EC_R_I2D_ECPKPARAMETERS_FAILURE);
1109 ECPKPARAMETERS_free(tmp);
1112 ECPKPARAMETERS_free(tmp);
1116 /* some EC_KEY functions */
1118 EC_KEY *d2i_ECPrivateKey(EC_KEY **a, const unsigned char **in, long len)
1122 EC_PRIVATEKEY *priv_key=NULL;
1124 if ((priv_key = EC_PRIVATEKEY_new()) == NULL)
1126 ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_MALLOC_FAILURE);
1130 if ((priv_key = d2i_EC_PRIVATEKEY(&priv_key, in, len)) == NULL)
1132 ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_EC_LIB);
1133 EC_PRIVATEKEY_free(priv_key);
1137 if (a == NULL || *a == NULL)
1139 if ((ret = EC_KEY_new()) == NULL)
1141 ECerr(EC_F_D2I_ECPRIVATEKEY,
1142 ERR_R_MALLOC_FAILURE);
1151 if (priv_key->parameters)
1154 EC_GROUP_clear_free(ret->group);
1155 ret->group = ec_asn1_pkparameters2group(priv_key->parameters);
1158 if (ret->group == NULL)
1160 ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_EC_LIB);
1164 ret->version = priv_key->version;
1166 if (priv_key->privateKey)
1168 ret->priv_key = BN_bin2bn(
1169 M_ASN1_STRING_data(priv_key->privateKey),
1170 M_ASN1_STRING_length(priv_key->privateKey),
1172 if (ret->priv_key == NULL)
1174 ECerr(EC_F_D2I_ECPRIVATEKEY,
1181 ECerr(EC_F_D2I_ECPRIVATEKEY,
1182 EC_R_MISSING_PRIVATE_KEY);
1187 EC_POINT_clear_free(ret->pub_key);
1188 ret->pub_key = EC_POINT_new(ret->group);
1189 if (ret->pub_key == NULL)
1191 ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_EC_LIB);
1195 if (priv_key->publicKey)
1197 const unsigned char *pub_oct;
1200 pub_oct = M_ASN1_STRING_data(priv_key->publicKey);
1201 pub_oct_len = M_ASN1_STRING_length(priv_key->publicKey);
1202 /* The first byte - point conversion form - must be present. */
1203 if (pub_oct_len <= 0)
1205 ECerr(EC_F_D2I_ECPRIVATEKEY, EC_R_BUFFER_TOO_SMALL);
1208 /* Save the point conversion form. */
1209 ret->conv_form = (point_conversion_form_t)(pub_oct[0] & ~0x01);
1210 if (!EC_POINT_oct2point(ret->group, ret->pub_key,
1211 pub_oct, (size_t)(pub_oct_len), NULL))
1213 ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_EC_LIB);
1219 if (!EC_POINT_mul(ret->group, ret->pub_key, ret->priv_key, NULL, NULL, NULL))
1221 ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_EC_LIB);
1224 /* Remember the original private-key-only encoding. */
1225 ret->enc_flag |= EC_PKEY_NO_PUBKEY;
1238 EC_PRIVATEKEY_free(priv_key);
1243 int i2d_ECPrivateKey(EC_KEY *a, unsigned char **out)
1246 unsigned char *buffer=NULL;
1247 size_t buf_len=0, tmp_len;
1248 EC_PRIVATEKEY *priv_key=NULL;
1250 if (a == NULL || a->group == NULL || a->priv_key == NULL ||
1251 (!(a->enc_flag & EC_PKEY_NO_PUBKEY) && a->pub_key == NULL))
1253 ECerr(EC_F_I2D_ECPRIVATEKEY,
1254 ERR_R_PASSED_NULL_PARAMETER);
1258 if ((priv_key = EC_PRIVATEKEY_new()) == NULL)
1260 ECerr(EC_F_I2D_ECPRIVATEKEY,
1261 ERR_R_MALLOC_FAILURE);
1265 priv_key->version = a->version;
1267 buf_len = (size_t)BN_num_bytes(a->priv_key);
1268 buffer = OPENSSL_malloc(buf_len);
1271 ECerr(EC_F_I2D_ECPRIVATEKEY,
1272 ERR_R_MALLOC_FAILURE);
1276 if (!BN_bn2bin(a->priv_key, buffer))
1278 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_BN_LIB);
1282 if (!M_ASN1_OCTET_STRING_set(priv_key->privateKey, buffer, buf_len))
1284 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_ASN1_LIB);
1288 if (!(a->enc_flag & EC_PKEY_NO_PARAMETERS))
1290 if ((priv_key->parameters = ec_asn1_group2pkparameters(
1291 a->group, priv_key->parameters)) == NULL)
1293 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_EC_LIB);
1298 if (!(a->enc_flag & EC_PKEY_NO_PUBKEY))
1300 priv_key->publicKey = M_ASN1_BIT_STRING_new();
1301 if (priv_key->publicKey == NULL)
1303 ECerr(EC_F_I2D_ECPRIVATEKEY,
1304 ERR_R_MALLOC_FAILURE);
1308 tmp_len = EC_POINT_point2oct(a->group, a->pub_key,
1309 a->conv_form, NULL, 0, NULL);
1311 if (tmp_len > buf_len)
1313 unsigned char *tmp_buffer = OPENSSL_realloc(buffer, tmp_len);
1316 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_MALLOC_FAILURE);
1319 buffer = tmp_buffer;
1323 if (!EC_POINT_point2oct(a->group, a->pub_key,
1324 a->conv_form, buffer, buf_len, NULL))
1326 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_EC_LIB);
1330 priv_key->publicKey->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT|0x07);
1331 priv_key->publicKey->flags |= ASN1_STRING_FLAG_BITS_LEFT;
1332 if (!M_ASN1_BIT_STRING_set(priv_key->publicKey, buffer,
1335 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_ASN1_LIB);
1340 if ((ret = i2d_EC_PRIVATEKEY(priv_key, out)) == 0)
1342 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_EC_LIB);
1348 OPENSSL_free(buffer);
1350 EC_PRIVATEKEY_free(priv_key);
1354 int i2d_ECParameters(EC_KEY *a, unsigned char **out)
1358 ECerr(EC_F_I2D_ECPARAMETERS, ERR_R_PASSED_NULL_PARAMETER);
1361 return i2d_ECPKParameters(a->group, out);
1364 EC_KEY *d2i_ECParameters(EC_KEY **a, const unsigned char **in, long len)
1368 if (in == NULL || *in == NULL)
1370 ECerr(EC_F_D2I_ECPARAMETERS, ERR_R_PASSED_NULL_PARAMETER);
1374 if (a == NULL || *a == NULL)
1376 if ((ret = EC_KEY_new()) == NULL)
1378 ECerr(EC_F_D2I_ECPARAMETERS, ERR_R_MALLOC_FAILURE);
1387 if (!d2i_ECPKParameters(&ret->group, in, len))
1389 ECerr(EC_F_D2I_ECPARAMETERS, ERR_R_EC_LIB);
1396 EC_KEY *o2i_ECPublicKey(EC_KEY **a, const unsigned char **in, long len)
1400 if (a == NULL || (*a) == NULL || (*a)->group == NULL)
1402 /* sorry, but a EC_GROUP-structur is necessary
1403 * to set the public key */
1404 ECerr(EC_F_O2I_ECPUBLICKEY, ERR_R_PASSED_NULL_PARAMETER);
1408 if (ret->pub_key == NULL &&
1409 (ret->pub_key = EC_POINT_new(ret->group)) == NULL)
1411 ECerr(EC_F_O2I_ECPUBLICKEY, ERR_R_MALLOC_FAILURE);
1414 if (!EC_POINT_oct2point(ret->group, ret->pub_key, *in, len, NULL))
1416 ECerr(EC_F_O2I_ECPUBLICKEY, ERR_R_EC_LIB);
1419 /* save the point conversion form */
1420 ret->conv_form = (point_conversion_form_t)(*in[0] & ~0x01);
1425 int i2o_ECPublicKey(EC_KEY *a, unsigned char **out)
1432 ECerr(EC_F_I2O_ECPUBLICKEY, ERR_R_PASSED_NULL_PARAMETER);
1436 buf_len = EC_POINT_point2oct(a->group, a->pub_key,
1437 a->conv_form, NULL, 0, NULL);
1439 if (out == NULL || buf_len == 0)
1440 /* out == NULL => just return the length of the octet string */
1445 if ((*out = OPENSSL_malloc(buf_len)) == NULL)
1447 ECerr(EC_F_I2O_ECPUBLICKEY, ERR_R_MALLOC_FAILURE);
1452 if (!EC_POINT_point2oct(a->group, a->pub_key, a->conv_form,
1453 *out, buf_len, NULL))
1455 ECerr(EC_F_I2O_ECPUBLICKEY, ERR_R_EC_LIB);