1 /* crypto/ec/ec_asn1.c */
3 * Written by Nils Larsch for the OpenSSL project.
5 /* ====================================================================
6 * Copyright (c) 2000-2002 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 */
87 int EC_GROUP_get_trinomial_basis(const EC_GROUP *group, unsigned int *k)
92 if (EC_GROUP_method_of(group)->group_set_curve != ec_GF2m_simple_group_set_curve
93 || !((group->poly[0] != 0) && (group->poly[1] != 0) && (group->poly[2] == 0)))
95 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_GROUP_method_of(group)->group_set_curve != ec_GF2m_simple_group_set_curve
112 || !((group->poly[0] != 0) && (group->poly[1] != 0) && (group->poly[2] != 0) && (group->poly[3] != 0) && (group->poly[4] == 0)))
114 ECerr(EC_F_EC_GROUP_GET_PENTANOMIAL_BASIS, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
119 *k1 = group->poly[3];
121 *k2 = group->poly[2];
123 *k3 = group->poly[1];
130 /* some structures needed for the asn1 encoding */
131 typedef struct x9_62_fieldid_st {
132 ASN1_OBJECT *fieldType;
133 ASN1_TYPE *parameters;
136 typedef struct x9_62_characteristic_two_st {
139 ASN1_TYPE *parameters;
140 } X9_62_CHARACTERISTIC_TWO;
142 typedef struct x9_62_pentanomial_st {
148 typedef struct x9_62_curve_st {
149 ASN1_OCTET_STRING *a;
150 ASN1_OCTET_STRING *b;
151 ASN1_BIT_STRING *seed;
154 typedef struct ec_parameters_st {
156 X9_62_FIELDID *fieldID;
158 ASN1_OCTET_STRING *base;
160 ASN1_INTEGER *cofactor;
163 struct ecpk_parameters_st {
166 ASN1_OBJECT *named_curve;
167 ECPARAMETERS *parameters;
168 ASN1_NULL *implicitlyCA;
170 }/* ECPKPARAMETERS */;
172 /* SEC1 ECPrivateKey */
173 typedef struct ec_privatekey_st {
175 ASN1_OCTET_STRING *privateKey;
176 ECPKPARAMETERS *parameters;
177 ASN1_BIT_STRING *publicKey;
180 /* the OpenSSL asn1 definitions */
182 ASN1_SEQUENCE(X9_62_FIELDID) = {
183 ASN1_SIMPLE(X9_62_FIELDID, fieldType, ASN1_OBJECT),
184 ASN1_SIMPLE(X9_62_FIELDID, parameters, ASN1_ANY)
185 } ASN1_SEQUENCE_END(X9_62_FIELDID)
187 DECLARE_ASN1_FUNCTIONS_const(X9_62_FIELDID)
188 DECLARE_ASN1_ENCODE_FUNCTIONS_const(X9_62_FIELDID, X9_62_FIELDID)
189 IMPLEMENT_ASN1_FUNCTIONS_const(X9_62_FIELDID)
191 ASN1_SEQUENCE(X9_62_CHARACTERISTIC_TWO) = {
192 ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, m, LONG),
193 ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, basis, ASN1_OBJECT),
194 ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, parameters, ASN1_ANY)
195 } ASN1_SEQUENCE_END(X9_62_CHARACTERISTIC_TWO)
197 DECLARE_ASN1_FUNCTIONS_const(X9_62_CHARACTERISTIC_TWO)
198 DECLARE_ASN1_ENCODE_FUNCTIONS_const(X9_62_CHARACTERISTIC_TWO, X9_62_CHARACTERISTIC_TWO)
199 IMPLEMENT_ASN1_FUNCTIONS_const(X9_62_CHARACTERISTIC_TWO)
201 ASN1_SEQUENCE(X9_62_PENTANOMIAL) = {
202 ASN1_SIMPLE(X9_62_PENTANOMIAL, k1, LONG),
203 ASN1_SIMPLE(X9_62_PENTANOMIAL, k2, LONG),
204 ASN1_SIMPLE(X9_62_PENTANOMIAL, k3, LONG)
205 } ASN1_SEQUENCE_END(X9_62_PENTANOMIAL)
207 DECLARE_ASN1_FUNCTIONS_const(X9_62_PENTANOMIAL)
208 DECLARE_ASN1_ENCODE_FUNCTIONS_const(X9_62_PENTANOMIAL, X9_62_PENTANOMIAL)
209 IMPLEMENT_ASN1_FUNCTIONS_const(X9_62_PENTANOMIAL)
211 ASN1_SEQUENCE(X9_62_CURVE) = {
212 ASN1_SIMPLE(X9_62_CURVE, a, ASN1_OCTET_STRING),
213 ASN1_SIMPLE(X9_62_CURVE, b, ASN1_OCTET_STRING),
214 ASN1_OPT(X9_62_CURVE, seed, ASN1_BIT_STRING)
215 } ASN1_SEQUENCE_END(X9_62_CURVE)
217 DECLARE_ASN1_FUNCTIONS_const(X9_62_CURVE)
218 DECLARE_ASN1_ENCODE_FUNCTIONS_const(X9_62_CURVE, X9_62_CURVE)
219 IMPLEMENT_ASN1_FUNCTIONS_const(X9_62_CURVE)
221 ASN1_SEQUENCE(ECPARAMETERS) = {
222 ASN1_SIMPLE(ECPARAMETERS, version, LONG),
223 ASN1_SIMPLE(ECPARAMETERS, fieldID, X9_62_FIELDID),
224 ASN1_SIMPLE(ECPARAMETERS, curve, X9_62_CURVE),
225 ASN1_SIMPLE(ECPARAMETERS, base, ASN1_OCTET_STRING),
226 ASN1_SIMPLE(ECPARAMETERS, order, ASN1_INTEGER),
227 ASN1_SIMPLE(ECPARAMETERS, cofactor, ASN1_INTEGER)
228 } ASN1_SEQUENCE_END(ECPARAMETERS)
230 DECLARE_ASN1_FUNCTIONS_const(ECPARAMETERS)
231 DECLARE_ASN1_ENCODE_FUNCTIONS_const(ECPARAMETERS, ECPARAMETERS)
232 IMPLEMENT_ASN1_FUNCTIONS_const(ECPARAMETERS)
234 ASN1_CHOICE(ECPKPARAMETERS) = {
235 ASN1_SIMPLE(ECPKPARAMETERS, value.named_curve, ASN1_OBJECT),
236 ASN1_SIMPLE(ECPKPARAMETERS, value.parameters, ECPARAMETERS),
237 ASN1_SIMPLE(ECPKPARAMETERS, value.implicitlyCA, ASN1_NULL)
238 } ASN1_CHOICE_END(ECPKPARAMETERS)
240 DECLARE_ASN1_FUNCTIONS_const(ECPKPARAMETERS)
241 DECLARE_ASN1_ENCODE_FUNCTIONS_const(ECPKPARAMETERS, ECPKPARAMETERS)
242 IMPLEMENT_ASN1_FUNCTIONS_const(ECPKPARAMETERS)
244 ASN1_SEQUENCE(EC_PRIVATEKEY) = {
245 ASN1_SIMPLE(EC_PRIVATEKEY, version, LONG),
246 ASN1_SIMPLE(EC_PRIVATEKEY, privateKey, ASN1_OCTET_STRING),
247 ASN1_EXP_OPT(EC_PRIVATEKEY, parameters, ECPKPARAMETERS, 0),
248 ASN1_EXP_OPT(EC_PRIVATEKEY, publicKey, ASN1_BIT_STRING, 1)
249 } ASN1_SEQUENCE_END(EC_PRIVATEKEY)
251 DECLARE_ASN1_FUNCTIONS_const(EC_PRIVATEKEY)
252 DECLARE_ASN1_ENCODE_FUNCTIONS_const(EC_PRIVATEKEY, EC_PRIVATEKEY)
253 IMPLEMENT_ASN1_FUNCTIONS_const(EC_PRIVATEKEY)
255 /* some declarations of internal function */
257 /* ec_asn1_group2field() creates a X9_62_FIELDID object from a
259 static X9_62_FIELDID *ec_asn1_group2field(const EC_GROUP *, X9_62_FIELDID *);
260 /* ec_asn1_group2curve() creates a X9_62_CURVE object from a
262 static X9_62_CURVE *ec_asn1_group2curve(const EC_GROUP *, X9_62_CURVE *);
263 /* ec_asn1_parameters2group() creates a EC_GROUP object from a
264 * ECPARAMETERS object */
265 static EC_GROUP *ec_asn1_parameters2group(const ECPARAMETERS *);
266 /* ec_asn1_group2parameters() creates a ECPARAMETERS object from a
268 static ECPARAMETERS *ec_asn1_group2parameters(const EC_GROUP *,ECPARAMETERS *);
269 /* ec_asn1_pkparameters2group() creates a EC_GROUP object from a
270 * ECPKPARAMETERS object */
271 static EC_GROUP *ec_asn1_pkparameters2group(const ECPKPARAMETERS *);
272 /* ec_asn1_group2pkparameters() creates a ECPKPARAMETERS object from a
274 static ECPKPARAMETERS *ec_asn1_group2pkparameters(const EC_GROUP *,
278 /* the function definitions */
280 static X9_62_FIELDID *ec_asn1_group2field(const EC_GROUP *group,
281 X9_62_FIELDID *field)
284 X9_62_FIELDID *ret = NULL;
285 X9_62_CHARACTERISTIC_TWO *char_two = NULL;
286 X9_62_PENTANOMIAL *penta = NULL;
288 unsigned char *buffer = NULL;
294 if ((ret = X9_62_FIELDID_new()) == NULL)
296 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE);
303 /* clear the old values */
304 if (ret->fieldType != NULL)
305 ASN1_OBJECT_free(ret->fieldType);
306 if (ret->parameters != NULL)
307 ASN1_TYPE_free(ret->parameters);
310 nid = EC_METHOD_get_field_type(EC_GROUP_method_of(group));
311 /* set OID for the field */
312 if ((ret->fieldType = OBJ_nid2obj(nid)) == NULL)
314 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_OBJ_LIB);
318 if ((ret->parameters = ASN1_TYPE_new()) == NULL)
320 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE);
324 if (nid == NID_X9_62_prime_field)
326 if ((tmp = BN_new()) == NULL)
328 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE);
331 /* the parameters are specified by the prime number p */
332 ret->parameters->type = V_ASN1_INTEGER;
333 if (!EC_GROUP_get_curve_GFp(group, tmp, NULL, NULL, NULL))
335 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_EC_LIB);
338 /* set the prime number */
339 ret->parameters->value.integer = BN_to_ASN1_INTEGER(tmp, NULL);
340 if (ret->parameters->value.integer == NULL)
342 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_ASN1_LIB);
346 else /* nid == NID_X9_62_characteristic_two_field */
350 char_two = X9_62_CHARACTERISTIC_TWO_new();
351 if (char_two == NULL)
353 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE);
357 char_two->m = (long)EC_GROUP_get_degree(group);
359 field_type = EC_GROUP_get_basis_type(group);
363 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_EC_LIB);
366 /* set base type OID */
367 if ((char_two->basis = OBJ_nid2obj(field_type)) == NULL)
369 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_OBJ_LIB);
373 if (field_type == NID_X9_62_tpBasis)
377 if (!EC_GROUP_get_trinomial_basis(group, &k))
380 char_two->parameters->type = V_ASN1_INTEGER;
381 char_two->parameters->value.integer =
383 if (char_two->parameters->value.integer == NULL)
385 ECerr(EC_F_EC_ASN1_GROUP2FIELDID,
389 if (!ASN1_INTEGER_set(char_two->parameters->value.integer, (long)k))
391 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS,
396 else if (field_type == NID_X9_62_ppBasis)
398 unsigned int k1, k2, k3;
400 if (!EC_GROUP_get_pentanomial_basis(group, &k1, &k2, &k3))
403 penta = X9_62_PENTANOMIAL_new();
405 penta->k1 = (long)k1;
406 penta->k2 = (long)k2;
407 penta->k3 = (long)k3;
408 /* get the length of the encoded structure */
409 buf_len = i2d_X9_62_PENTANOMIAL(penta, NULL);
410 if ((buffer = OPENSSL_malloc(buf_len)) == NULL)
412 ECerr(EC_F_EC_ASN1_GROUP2FIELDID,
413 ERR_R_MALLOC_FAILURE);
417 i2d_X9_62_PENTANOMIAL(penta, &pp);
418 /* set the encoded pentanomial */
419 char_two->parameters->type=V_ASN1_SEQUENCE;
420 char_two->parameters->value.sequence=ASN1_STRING_new();
421 ASN1_STRING_set(char_two->parameters->value.sequence,
424 OPENSSL_free(buffer);
427 else /* field_type == NID_X9_62_onBasis */
429 /* for ONB the parameters are (asn1) NULL */
430 char_two->parameters->type = V_ASN1_NULL;
432 /* encoded the X9_62_CHARACTERISTIC_TWO structure */
433 buf_len = i2d_X9_62_CHARACTERISTIC_TWO(char_two, NULL);
435 if ((buffer = OPENSSL_malloc(buf_len)) == NULL)
437 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE);
441 i2d_X9_62_CHARACTERISTIC_TWO(char_two, &pp);
442 /* set the encoded parameters */
443 ret->parameters->type = V_ASN1_SEQUENCE;
444 ret->parameters->value.sequence = ASN1_STRING_new();
445 ASN1_STRING_set(ret->parameters->value.sequence,
454 X9_62_FIELDID_free(ret);
460 X9_62_CHARACTERISTIC_TWO_free(char_two);
462 X9_62_PENTANOMIAL_free(penta);
464 OPENSSL_free(buffer);
468 static X9_62_CURVE *ec_asn1_group2curve(const EC_GROUP *group,
472 X9_62_CURVE *ret=NULL;
475 unsigned char *buffer_1=NULL,
480 unsigned char char_zero = 0;
482 if ((tmp_1 = BN_new()) == NULL || (tmp_2 = BN_new()) == NULL)
484 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_MALLOC_FAILURE);
490 if ((ret = X9_62_CURVE_new()) == NULL)
492 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_MALLOC_FAILURE);
500 ASN1_OCTET_STRING_free(ret->a);
502 ASN1_OCTET_STRING_free(ret->b);
504 ASN1_BIT_STRING_free(ret->seed);
507 nid = EC_METHOD_get_field_type(EC_GROUP_method_of(group));
510 if (nid == NID_X9_62_prime_field)
512 if (!EC_GROUP_get_curve_GFp(group, NULL, tmp_1, tmp_2, NULL))
514 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_EC_LIB);
518 else /* nid == NID_X9_62_characteristic_two_field */
520 if (!EC_GROUP_get_curve_GF2m(group, NULL, tmp_1, tmp_2, NULL))
522 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_EC_LIB);
527 len_1 = (size_t)BN_num_bytes(tmp_1);
528 len_2 = (size_t)BN_num_bytes(tmp_2);
532 /* len_1 == 0 => a == 0 */
538 if ((buffer_1 = OPENSSL_malloc(len_1)) == NULL)
540 ECerr(EC_F_EC_ASN1_GROUP2CURVE,
541 ERR_R_MALLOC_FAILURE);
544 if ( (len_1 = BN_bn2bin(tmp_1, buffer_1)) == 0)
546 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_BN_LIB);
554 /* len_2 == 0 => b == 0 */
560 if ((buffer_2 = OPENSSL_malloc(len_2)) == NULL)
562 ECerr(EC_F_EC_ASN1_GROUP2CURVE,
563 ERR_R_MALLOC_FAILURE);
566 if ( (len_2 = BN_bn2bin(tmp_2, buffer_2)) == 0)
568 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_BN_LIB);
575 if ((ret->a = M_ASN1_OCTET_STRING_new()) == NULL ||
576 (ret->b = M_ASN1_OCTET_STRING_new()) == NULL )
578 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_MALLOC_FAILURE);
581 if (!M_ASN1_OCTET_STRING_set(ret->a, a_buf, len_1) ||
582 !M_ASN1_OCTET_STRING_set(ret->b, b_buf, len_2))
584 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_ASN1_LIB);
588 /* set the seed (optional) */
591 if ((ret->seed = ASN1_BIT_STRING_new()) == NULL) goto err;
592 if (!ASN1_BIT_STRING_set(ret->seed, group->seed,
593 (int)group->seed_len))
595 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_ASN1_LIB);
607 X9_62_CURVE_free(ret);
611 OPENSSL_free(buffer_1);
613 OPENSSL_free(buffer_2);
621 static ECPARAMETERS *ec_asn1_group2parameters(const EC_GROUP *group,
626 ECPARAMETERS *ret=NULL;
628 unsigned char *buffer=NULL;
629 const EC_POINT *point=NULL;
630 point_conversion_form_t form;
632 if ((tmp = BN_new()) == NULL)
634 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_MALLOC_FAILURE);
640 if ((ret = ECPARAMETERS_new()) == NULL)
642 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS,
643 ERR_R_MALLOC_FAILURE);
650 /* set the version (always one) */
651 ret->version = (long)0x1;
653 /* set the fieldID */
654 ret->fieldID = ec_asn1_group2field(group, ret->fieldID);
655 if (ret->fieldID == NULL)
657 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_EC_LIB);
662 ret->curve = ec_asn1_group2curve(group, ret->curve);
663 if (ret->curve == NULL)
665 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_EC_LIB);
669 /* set the base point */
670 if ((point = EC_GROUP_get0_generator(group)) == NULL)
672 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, EC_R_UNDEFINED_GENERATOR);
676 form = EC_GROUP_get_point_conversion_form(group);
678 len = EC_POINT_point2oct(group, point, form, NULL, len, NULL);
681 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_EC_LIB);
684 if ((buffer = OPENSSL_malloc(len)) == NULL)
686 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_MALLOC_FAILURE);
689 if (!EC_POINT_point2oct(group, point, form, buffer, len, NULL))
691 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_EC_LIB);
694 if (ret->base == NULL && (ret->base = ASN1_OCTET_STRING_new()) == NULL)
696 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_MALLOC_FAILURE);
699 if (!ASN1_OCTET_STRING_set(ret->base, buffer, len))
701 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_ASN1_LIB);
706 if (!EC_GROUP_get_order(group, tmp, NULL))
708 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_EC_LIB);
711 ret->order = BN_to_ASN1_INTEGER(tmp, ret->order);
712 if (ret->order == NULL)
714 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_ASN1_LIB);
718 /* set the cofactor */
719 if (!EC_GROUP_get_cofactor(group, tmp, NULL))
721 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_EC_LIB);
724 ret->cofactor = BN_to_ASN1_INTEGER(tmp, ret->cofactor);
725 if (ret->cofactor == NULL)
727 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_ASN1_LIB);
736 ECPARAMETERS_free(ret);
742 OPENSSL_free(buffer);
746 ECPKPARAMETERS *ec_asn1_group2pkparameters(const EC_GROUP *group,
747 ECPKPARAMETERS *params)
750 ECPKPARAMETERS *ret = params;
754 if ((ret = ECPKPARAMETERS_new()) == NULL)
756 ECerr(EC_F_EC_ASN1_GROUP2PKPARAMETERS,
757 ERR_R_MALLOC_FAILURE);
763 if (ret->type == 0 && ret->value.named_curve)
764 ASN1_OBJECT_free(ret->value.named_curve);
765 else if (ret->type == 1 && ret->value.parameters)
766 ECPARAMETERS_free(ret->value.parameters);
769 if (EC_GROUP_get_asn1_flag(group))
771 /* use the asn1 OID to describe the
772 * the elliptic curve parameters
774 tmp = EC_GROUP_get_nid(group);
778 if ((ret->value.named_curve = OBJ_nid2obj(tmp)) == NULL)
782 /* we don't kmow the nid => ERROR */
787 /* use the ECPARAMETERS structure */
789 if ((ret->value.parameters = ec_asn1_group2parameters(
790 group, NULL)) == NULL)
796 ECPKPARAMETERS_free(ret);
802 static EC_GROUP *ec_asn1_parameters2group(const ECPARAMETERS *params)
805 EC_GROUP *ret = NULL;
806 BIGNUM *p = NULL, *a = NULL, *b = NULL;
807 EC_POINT *point=NULL;
808 X9_62_CHARACTERISTIC_TWO *char_two = NULL;
809 X9_62_PENTANOMIAL *penta = NULL;
812 if (!params->fieldID || !params->fieldID->fieldType ||
813 !params->fieldID->parameters)
815 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_ASN1_ERROR);
819 /* now extract the curve parameters a and b */
820 if (!params->curve || !params->curve->a ||
821 !params->curve->a->data || !params->curve->b ||
822 !params->curve->b->data)
824 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_ASN1_ERROR);
827 a = BN_bin2bn(params->curve->a->data, params->curve->a->length, NULL);
830 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_BN_LIB);
833 b = BN_bin2bn(params->curve->b->data, params->curve->b->length, NULL);
836 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_BN_LIB);
840 /* get the field parameters */
841 tmp = OBJ_obj2nid(params->fieldID->fieldType);
843 if (tmp == NID_X9_62_characteristic_two_field)
845 ASN1_TYPE *parameters = params->fieldID->parameters;
847 if (parameters->type != V_ASN1_SEQUENCE)
849 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_ASN1_ERROR);
853 if ((p = BN_new()) == NULL)
855 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP,
856 ERR_R_MALLOC_FAILURE);
860 /* extract the X9_62_CHARACTERISTIC_TWO object */
861 pp = M_ASN1_STRING_data(parameters->value.sequence);
862 char_two = d2i_X9_62_CHARACTERISTIC_TWO(NULL,
863 (const unsigned char **) &pp,
864 M_ASN1_STRING_length(parameters->value.sequence));
865 if (char_two == NULL)
867 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_ASN1_LIB);
870 /* get the base type */
871 tmp = OBJ_obj2nid(char_two->basis);
873 if (tmp == NID_X9_62_tpBasis)
877 if (char_two->parameters->type != V_ASN1_INTEGER ||
878 char_two->parameters->value.integer == NULL)
880 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP,
885 tmp_long = ASN1_INTEGER_get(char_two->parameters->value.integer);
886 /* create the polynomial */
887 if (!BN_set_bit(p, (int)char_two->m)) goto err;
888 if (!BN_set_bit(p, (int)tmp_long)) goto err;
889 if (!BN_set_bit(p, 0)) goto err;
891 else if (tmp == NID_X9_62_ppBasis)
893 if (char_two->parameters->type != V_ASN1_SEQUENCE ||
894 char_two->parameters->value.sequence == NULL)
896 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP,
900 /* extract the pentanomial data */
901 pp = M_ASN1_STRING_data(
902 char_two->parameters->value.sequence);
903 penta = d2i_X9_62_PENTANOMIAL(NULL,
904 (const unsigned char **) &pp,
905 M_ASN1_STRING_length(
906 char_two->parameters->value.sequence));
909 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP,
913 /* create the polynomial */
914 if (!BN_set_bit(p, (int)char_two->m)) goto err;
915 if (!BN_set_bit(p, (int)penta->k1)) goto err;
916 if (!BN_set_bit(p, (int)penta->k2)) goto err;
917 if (!BN_set_bit(p, (int)penta->k3)) goto err;
918 if (!BN_set_bit(p, 0)) goto err;
920 else if (tmp == NID_X9_62_onBasis)
922 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP,
923 EC_R_NOT_IMPLEMENTED);
928 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_ASN1_ERROR);
932 /* create the EC_GROUP structure */
933 ret = EC_GROUP_new_curve_GF2m(p, a, b, NULL);
936 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_EC_LIB);
940 else if (tmp == NID_X9_62_prime_field)
942 /* we have a curve over a prime field */
943 /* extract the prime number */
944 if (params->fieldID->parameters->type != V_ASN1_INTEGER ||
945 !params->fieldID->parameters->value.integer)
947 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_ASN1_ERROR);
950 p = ASN1_INTEGER_to_BN(params->fieldID->parameters->value.integer, NULL);
953 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_ASN1_LIB);
956 /* create the EC_GROUP structure */
957 ret = EC_GROUP_new_curve_GFp(p, a, b, NULL);
960 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_EC_LIB);
965 /* extract seed (optional) */
966 if (params->curve->seed != NULL)
968 if (ret->seed != NULL)
969 OPENSSL_free(ret->seed);
970 if (!(ret->seed = OPENSSL_malloc(params->curve->seed->length)))
972 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP,
973 ERR_R_MALLOC_FAILURE);
976 memcpy(ret->seed, params->curve->seed->data,
977 params->curve->seed->length);
978 ret->seed_len = params->curve->seed->length;
981 /* extract the order, cofactor and generator */
982 if (!params->order || !params->cofactor || !params->base ||
985 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_ASN1_ERROR);
989 if ((point = EC_POINT_new(ret)) == NULL) goto err;
991 a = ASN1_INTEGER_to_BN(params->order, a);
992 b = ASN1_INTEGER_to_BN(params->cofactor, b);
995 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_ASN1_LIB);
999 if (!EC_POINT_oct2point(ret, point, params->base->data,
1000 params->base->length, NULL))
1002 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_EC_LIB);
1006 /* set the point conversion form */
1007 EC_GROUP_set_point_conversion_form(ret, (point_conversion_form_t)
1008 (params->base->data[0] & ~0x01));
1010 if (!EC_GROUP_set_generator(ret, point, a, b))
1012 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_EC_LIB);
1021 EC_GROUP_clear_free(ret);
1032 EC_POINT_free(point);
1034 X9_62_CHARACTERISTIC_TWO_free(char_two);
1036 X9_62_PENTANOMIAL_free(penta);
1040 EC_GROUP *ec_asn1_pkparameters2group(const ECPKPARAMETERS *params)
1047 ECerr(EC_F_EC_ASN1_PKPARAMETERS2GROUP,
1048 EC_R_MISSING_PARAMETERS);
1052 if (params->type == 0)
1053 { /* the curve is given by an OID */
1054 tmp = OBJ_obj2nid(params->value.named_curve);
1055 if ((ret = EC_GROUP_new_by_nid(tmp)) == NULL)
1057 ECerr(EC_F_EC_ASN1_PKPARAMETERS2GROUP,
1058 EC_R_EC_GROUP_NEW_BY_NAME_FAILURE);
1061 EC_GROUP_set_asn1_flag(ret, OPENSSL_EC_NAMED_CURVE);
1063 else if (params->type == 1)
1064 { /* the parameters are given by a ECPARAMETERS
1066 ret = ec_asn1_parameters2group(params->value.parameters);
1069 ECerr(EC_F_EC_ASN1_PKPARAMETERS2GROUP, ERR_R_EC_LIB);
1072 EC_GROUP_set_asn1_flag(ret, 0x0);
1074 else if (params->type == 2)
1075 { /* implicitlyCA */
1080 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_ASN1_ERROR);
1087 /* EC_GROUP <-> DER encoding of ECPKPARAMETERS */
1089 EC_GROUP *d2i_ECPKParameters(EC_GROUP **a, const unsigned char **in, long len)
1091 EC_GROUP *group = NULL;
1092 ECPKPARAMETERS *params = NULL;
1094 if ((params = d2i_ECPKPARAMETERS(NULL, in, len)) == NULL)
1096 ECerr(EC_F_D2I_ECPKPARAMETERS, EC_R_D2I_ECPKPARAMETERS_FAILURE);
1097 ECPKPARAMETERS_free(params);
1101 if ((group = ec_asn1_pkparameters2group(params)) == NULL)
1103 ECerr(EC_F_D2I_ECPKPARAMETERS, EC_R_PKPARAMETERS2GROUP_FAILURE);
1109 EC_GROUP_clear_free(*a);
1113 ECPKPARAMETERS_free(params);
1117 int i2d_ECPKParameters(const EC_GROUP *a, unsigned char **out)
1120 ECPKPARAMETERS *tmp = ec_asn1_group2pkparameters(a, NULL);
1123 ECerr(EC_F_I2D_ECPKPARAMETERS, EC_R_GROUP2PKPARAMETERS_FAILURE);
1126 if ((ret = i2d_ECPKPARAMETERS(tmp, out)) == 0)
1128 ECerr(EC_F_I2D_ECPKPARAMETERS, EC_R_I2D_ECPKPARAMETERS_FAILURE);
1129 ECPKPARAMETERS_free(tmp);
1132 ECPKPARAMETERS_free(tmp);
1136 /* some EC_KEY functions */
1138 EC_KEY *d2i_ECPrivateKey(EC_KEY **a, const unsigned char **in, long len)
1142 EC_PRIVATEKEY *priv_key=NULL;
1144 if ((priv_key = EC_PRIVATEKEY_new()) == NULL)
1146 ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_MALLOC_FAILURE);
1150 if ((priv_key = d2i_EC_PRIVATEKEY(&priv_key, in, len)) == NULL)
1152 ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_EC_LIB);
1153 EC_PRIVATEKEY_free(priv_key);
1157 if (a == NULL || *a == NULL)
1159 if ((ret = EC_KEY_new()) == NULL)
1161 ECerr(EC_F_D2I_ECPRIVATEKEY,
1162 ERR_R_MALLOC_FAILURE);
1171 if (priv_key->parameters)
1174 EC_GROUP_clear_free(ret->group);
1175 ret->group = ec_asn1_pkparameters2group(priv_key->parameters);
1178 if (ret->group == NULL)
1180 ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_EC_LIB);
1184 ret->version = priv_key->version;
1186 if (priv_key->privateKey)
1188 ret->priv_key = BN_bin2bn(
1189 M_ASN1_STRING_data(priv_key->privateKey),
1190 M_ASN1_STRING_length(priv_key->privateKey),
1192 if (ret->priv_key == NULL)
1194 ECerr(EC_F_D2I_ECPRIVATEKEY,
1201 ECerr(EC_F_D2I_ECPRIVATEKEY,
1202 EC_R_MISSING_PRIVATE_KEY);
1206 if (priv_key->publicKey)
1209 EC_POINT_clear_free(ret->pub_key);
1210 ret->pub_key = EC_POINT_new(ret->group);
1211 if (ret->pub_key == NULL)
1213 ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_EC_LIB);
1216 if (!EC_POINT_oct2point(ret->group, ret->pub_key,
1217 M_ASN1_STRING_data(priv_key->publicKey),
1218 M_ASN1_STRING_length(priv_key->publicKey), NULL))
1220 ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_EC_LIB);
1235 EC_PRIVATEKEY_free(priv_key);
1240 int i2d_ECPrivateKey(EC_KEY *a, unsigned char **out)
1243 unsigned char *buffer=NULL;
1244 size_t buf_len=0, tmp_len;
1245 EC_PRIVATEKEY *priv_key=NULL;
1247 if (a == NULL || a->group == NULL || a->priv_key == NULL)
1249 ECerr(EC_F_I2D_ECPRIVATEKEY,
1250 ERR_R_PASSED_NULL_PARAMETER);
1254 if ((priv_key = EC_PRIVATEKEY_new()) == NULL)
1256 ECerr(EC_F_I2D_ECPRIVATEKEY,
1257 ERR_R_MALLOC_FAILURE);
1261 priv_key->version = a->version;
1263 buf_len = (size_t)BN_num_bytes(a->priv_key);
1264 buffer = OPENSSL_malloc(buf_len);
1267 ECerr(EC_F_I2D_ECPRIVATEKEY,
1268 ERR_R_MALLOC_FAILURE);
1272 if (!BN_bn2bin(a->priv_key, buffer))
1274 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_BN_LIB);
1278 if (!M_ASN1_OCTET_STRING_set(priv_key->privateKey, buffer, buf_len))
1280 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_ASN1_LIB);
1284 if (!(a->enc_flag & EC_PKEY_NO_PARAMETERS))
1286 if ((priv_key->parameters = ec_asn1_group2pkparameters(
1287 a->group, priv_key->parameters)) == NULL)
1289 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_EC_LIB);
1294 if (!(a->enc_flag & EC_PKEY_NO_PUBKEY))
1296 priv_key->publicKey = M_ASN1_BIT_STRING_new();
1297 if (priv_key->publicKey == NULL)
1299 ECerr(EC_F_I2D_ECPRIVATEKEY,
1300 ERR_R_MALLOC_FAILURE);
1304 tmp_len = EC_POINT_point2oct(a->group, a->pub_key,
1305 a->conv_form, NULL, 0, NULL);
1307 if (tmp_len > buf_len)
1308 buffer = OPENSSL_realloc(buffer, tmp_len);
1311 ECerr(EC_F_I2D_ECPRIVATEKEY,
1312 ERR_R_MALLOC_FAILURE);
1318 if (!EC_POINT_point2oct(a->group, a->pub_key,
1319 a->conv_form, buffer, buf_len, NULL))
1321 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_EC_LIB);
1325 if (!M_ASN1_BIT_STRING_set(priv_key->publicKey, buffer,
1328 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_ASN1_LIB);
1333 if ((ret = i2d_EC_PRIVATEKEY(priv_key, out)) == 0)
1335 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_EC_LIB);
1341 OPENSSL_free(buffer);
1343 EC_PRIVATEKEY_free(priv_key);
1347 int i2d_ECParameters(EC_KEY *a, unsigned char **out)
1351 ECerr(EC_F_I2D_ECPARAMETERS, ERR_R_PASSED_NULL_PARAMETER);
1354 return i2d_ECPKParameters(a->group, out);
1357 EC_KEY *d2i_ECParameters(EC_KEY **a, const unsigned char **in, long len)
1362 if (in == NULL || *in == NULL)
1364 ECerr(EC_F_D2I_ECPARAMETERS, ERR_R_PASSED_NULL_PARAMETER);
1368 group = d2i_ECPKParameters(NULL, in, len);
1372 ECerr(EC_F_D2I_ECPARAMETERS, ERR_R_EC_LIB);
1376 if (a == NULL || *a == NULL)
1378 if ((ret = EC_KEY_new()) == NULL)
1380 ECerr(EC_F_D2I_ECPARAMETERS, ERR_R_MALLOC_FAILURE);
1390 EC_GROUP_clear_free(ret->group);
1397 EC_KEY *ECPublicKey_set_octet_string(EC_KEY **a, const unsigned char **in,
1402 if (a == NULL || (*a) == NULL || (*a)->group == NULL)
1404 /* sorry, but a EC_GROUP-structur is necessary
1405 * to set the public key */
1406 ECerr(EC_F_ECPUBLICKEY_SET_OCTET, ERR_R_PASSED_NULL_PARAMETER);
1410 if (ret->pub_key == NULL &&
1411 (ret->pub_key = EC_POINT_new(ret->group)) == NULL)
1413 ECerr(EC_F_ECPUBLICKEY_SET_OCTET, ERR_R_MALLOC_FAILURE);
1416 if (!EC_POINT_oct2point(ret->group, ret->pub_key, *in, len, NULL))
1418 ECerr(EC_F_ECPUBLICKEY_SET_OCTET, ERR_R_EC_LIB);
1421 /* save the point conversion form */
1422 ret->conv_form = (point_conversion_form_t)(*in[0] & ~0x01);
1426 int ECPublicKey_get_octet_string(EC_KEY *a, unsigned char **out)
1432 ECerr(EC_F_ECPUBLICKEY_GET_OCTET, 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 */
1444 if ((*out = OPENSSL_malloc(buf_len)) == NULL)
1446 ECerr(EC_F_ECPUBLICKEY_GET_OCTET,
1447 ERR_R_MALLOC_FAILURE);
1450 if (!EC_POINT_point2oct(a->group, a->pub_key, a->conv_form,
1451 *out, buf_len, NULL))
1453 ECerr(EC_F_ECPUBLICKEY_GET_OCTET, ERR_R_EC_LIB);