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 */
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_pentanomial_st
{
137 typedef struct x9_62_characteristic_two_st
{
142 /* NID_X9_62_onBasis */
144 /* NID_X9_62_tpBasis */
145 ASN1_INTEGER
*tpBasis
;
146 /* NID_X9_62_ppBasis */
147 X9_62_PENTANOMIAL
*ppBasis
;
151 } X9_62_CHARACTERISTIC_TWO
;
153 typedef struct x9_62_fieldid_st
{
154 ASN1_OBJECT
*fieldType
;
157 /* NID_X9_62_prime_field */
159 /* NID_X9_62_characteristic_two_field */
160 X9_62_CHARACTERISTIC_TWO
*char_two
;
166 typedef struct x9_62_curve_st
{
167 ASN1_OCTET_STRING
*a
;
168 ASN1_OCTET_STRING
*b
;
169 ASN1_BIT_STRING
*seed
;
172 typedef struct ec_parameters_st
{
174 X9_62_FIELDID
*fieldID
;
176 ASN1_OCTET_STRING
*base
;
178 ASN1_INTEGER
*cofactor
;
181 struct ecpk_parameters_st
{
184 ASN1_OBJECT
*named_curve
;
185 ECPARAMETERS
*parameters
;
186 ASN1_NULL
*implicitlyCA
;
188 }/* ECPKPARAMETERS */;
190 /* SEC1 ECPrivateKey */
191 typedef struct ec_privatekey_st
{
193 ASN1_OCTET_STRING
*privateKey
;
194 ECPKPARAMETERS
*parameters
;
195 ASN1_BIT_STRING
*publicKey
;
198 /* the OpenSSL ASN.1 definitions */
199 ASN1_SEQUENCE(X9_62_PENTANOMIAL
) = {
200 ASN1_SIMPLE(X9_62_PENTANOMIAL
, k1
, LONG
),
201 ASN1_SIMPLE(X9_62_PENTANOMIAL
, k2
, LONG
),
202 ASN1_SIMPLE(X9_62_PENTANOMIAL
, k3
, LONG
)
203 } ASN1_SEQUENCE_END(X9_62_PENTANOMIAL
)
205 DECLARE_ASN1_ALLOC_FUNCTIONS(X9_62_PENTANOMIAL
)
206 IMPLEMENT_ASN1_ALLOC_FUNCTIONS(X9_62_PENTANOMIAL
)
208 ASN1_ADB_TEMPLATE(char_two_def
) = ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO
, p
.other
, ASN1_ANY
);
210 ASN1_ADB(X9_62_CHARACTERISTIC_TWO
) = {
211 ADB_ENTRY(NID_X9_62_onBasis
, ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO
, p
.onBasis
, ASN1_NULL
)),
212 ADB_ENTRY(NID_X9_62_tpBasis
, ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO
, p
.tpBasis
, ASN1_INTEGER
)),
213 ADB_ENTRY(NID_X9_62_ppBasis
, ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO
, p
.ppBasis
, X9_62_PENTANOMIAL
))
214 } ASN1_ADB_END(X9_62_CHARACTERISTIC_TWO
, 0, type
, 0, &char_two_def_tt
, NULL
);
216 ASN1_SEQUENCE(X9_62_CHARACTERISTIC_TWO
) = {
217 ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO
, m
, LONG
),
218 ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO
, type
, ASN1_OBJECT
),
219 ASN1_ADB_OBJECT(X9_62_CHARACTERISTIC_TWO
)
220 } ASN1_SEQUENCE_END(X9_62_CHARACTERISTIC_TWO
)
222 DECLARE_ASN1_ALLOC_FUNCTIONS(X9_62_CHARACTERISTIC_TWO
)
223 IMPLEMENT_ASN1_ALLOC_FUNCTIONS(X9_62_CHARACTERISTIC_TWO
)
225 ASN1_ADB_TEMPLATE(fieldID_def
) = ASN1_SIMPLE(X9_62_FIELDID
, p
.other
, ASN1_ANY
);
227 ASN1_ADB(X9_62_FIELDID
) = {
228 ADB_ENTRY(NID_X9_62_prime_field
, ASN1_SIMPLE(X9_62_FIELDID
, p
.prime
, ASN1_INTEGER
)),
229 ADB_ENTRY(NID_X9_62_characteristic_two_field
, ASN1_SIMPLE(X9_62_FIELDID
, p
.char_two
, X9_62_CHARACTERISTIC_TWO
))
230 } ASN1_ADB_END(X9_62_FIELDID
, 0, fieldType
, 0, &fieldID_def_tt
, NULL
);
232 ASN1_SEQUENCE(X9_62_FIELDID
) = {
233 ASN1_SIMPLE(X9_62_FIELDID
, fieldType
, ASN1_OBJECT
),
234 ASN1_ADB_OBJECT(X9_62_FIELDID
)
235 } ASN1_SEQUENCE_END(X9_62_FIELDID
)
237 ASN1_SEQUENCE(X9_62_CURVE
) = {
238 ASN1_SIMPLE(X9_62_CURVE
, a
, ASN1_OCTET_STRING
),
239 ASN1_SIMPLE(X9_62_CURVE
, b
, ASN1_OCTET_STRING
),
240 ASN1_OPT(X9_62_CURVE
, seed
, ASN1_BIT_STRING
)
241 } ASN1_SEQUENCE_END(X9_62_CURVE
)
243 ASN1_SEQUENCE(ECPARAMETERS
) = {
244 ASN1_SIMPLE(ECPARAMETERS
, version
, LONG
),
245 ASN1_SIMPLE(ECPARAMETERS
, fieldID
, X9_62_FIELDID
),
246 ASN1_SIMPLE(ECPARAMETERS
, curve
, X9_62_CURVE
),
247 ASN1_SIMPLE(ECPARAMETERS
, base
, ASN1_OCTET_STRING
),
248 ASN1_SIMPLE(ECPARAMETERS
, order
, ASN1_INTEGER
),
249 ASN1_OPT(ECPARAMETERS
, cofactor
, ASN1_INTEGER
)
250 } ASN1_SEQUENCE_END(ECPARAMETERS
)
252 DECLARE_ASN1_ALLOC_FUNCTIONS(ECPARAMETERS
)
253 IMPLEMENT_ASN1_ALLOC_FUNCTIONS(ECPARAMETERS
)
255 ASN1_CHOICE(ECPKPARAMETERS
) = {
256 ASN1_SIMPLE(ECPKPARAMETERS
, value
.named_curve
, ASN1_OBJECT
),
257 ASN1_SIMPLE(ECPKPARAMETERS
, value
.parameters
, ECPARAMETERS
),
258 ASN1_SIMPLE(ECPKPARAMETERS
, value
.implicitlyCA
, ASN1_NULL
)
259 } ASN1_CHOICE_END(ECPKPARAMETERS
)
261 DECLARE_ASN1_FUNCTIONS_const(ECPKPARAMETERS
)
262 DECLARE_ASN1_ENCODE_FUNCTIONS_const(ECPKPARAMETERS
, ECPKPARAMETERS
)
263 IMPLEMENT_ASN1_FUNCTIONS_const(ECPKPARAMETERS
)
265 ASN1_SEQUENCE(EC_PRIVATEKEY
) = {
266 ASN1_SIMPLE(EC_PRIVATEKEY
, version
, LONG
),
267 ASN1_SIMPLE(EC_PRIVATEKEY
, privateKey
, ASN1_OCTET_STRING
),
268 ASN1_EXP_OPT(EC_PRIVATEKEY
, parameters
, ECPKPARAMETERS
, 0),
269 ASN1_EXP_OPT(EC_PRIVATEKEY
, publicKey
, ASN1_BIT_STRING
, 1)
270 } ASN1_SEQUENCE_END(EC_PRIVATEKEY
)
272 DECLARE_ASN1_FUNCTIONS_const(EC_PRIVATEKEY
)
273 DECLARE_ASN1_ENCODE_FUNCTIONS_const(EC_PRIVATEKEY
, EC_PRIVATEKEY
)
274 IMPLEMENT_ASN1_FUNCTIONS_const(EC_PRIVATEKEY
)
276 /* some declarations of internal function */
278 /* ec_asn1_group2field() sets the values in a X9_62_FIELDID object */
279 static int ec_asn1_group2fieldid(const EC_GROUP
*, X9_62_FIELDID
*);
280 /* ec_asn1_group2curve() sets the values in a X9_62_CURVE object */
281 static int ec_asn1_group2curve(const EC_GROUP
*, X9_62_CURVE
*);
282 /* ec_asn1_parameters2group() creates a EC_GROUP object from a
283 * ECPARAMETERS object */
284 static EC_GROUP
*ec_asn1_parameters2group(const ECPARAMETERS
*);
285 /* ec_asn1_group2parameters() creates a ECPARAMETERS object from a
287 static ECPARAMETERS
*ec_asn1_group2parameters(const EC_GROUP
*,ECPARAMETERS
*);
288 /* ec_asn1_pkparameters2group() creates a EC_GROUP object from a
289 * ECPKPARAMETERS object */
290 static EC_GROUP
*ec_asn1_pkparameters2group(const ECPKPARAMETERS
*);
291 /* ec_asn1_group2pkparameters() creates a ECPKPARAMETERS object from a
293 static ECPKPARAMETERS
*ec_asn1_group2pkparameters(const EC_GROUP
*,
297 /* the function definitions */
299 static int ec_asn1_group2fieldid(const EC_GROUP
*group
, X9_62_FIELDID
*field
)
304 if (group
== NULL
|| field
== NULL
)
307 /* clear the old values (if necessary) */
308 if (field
->fieldType
!= NULL
)
309 ASN1_OBJECT_free(field
->fieldType
);
310 if (field
->p
.other
!= NULL
)
311 ASN1_TYPE_free(field
->p
.other
);
313 nid
= EC_METHOD_get_field_type(EC_GROUP_method_of(group
));
314 /* set OID for the field */
315 if ((field
->fieldType
= OBJ_nid2obj(nid
)) == NULL
)
317 ECerr(EC_F_EC_ASN1_GROUP2FIELDID
, ERR_R_OBJ_LIB
);
321 if (nid
== NID_X9_62_prime_field
)
323 if ((tmp
= BN_new()) == NULL
)
325 ECerr(EC_F_EC_ASN1_GROUP2FIELDID
, ERR_R_MALLOC_FAILURE
);
328 /* the parameters are specified by the prime number p */
329 if (!EC_GROUP_get_curve_GFp(group
, tmp
, NULL
, NULL
, NULL
))
331 ECerr(EC_F_EC_ASN1_GROUP2FIELDID
, ERR_R_EC_LIB
);
334 /* set the prime number */
335 field
->p
.prime
= BN_to_ASN1_INTEGER(tmp
,NULL
);
336 if (field
->p
.prime
== NULL
)
338 ECerr(EC_F_EC_ASN1_GROUP2FIELDID
, ERR_R_ASN1_LIB
);
342 else /* nid == NID_X9_62_characteristic_two_field */
345 X9_62_CHARACTERISTIC_TWO
*char_two
;
347 field
->p
.char_two
= X9_62_CHARACTERISTIC_TWO_new();
348 char_two
= field
->p
.char_two
;
350 if (char_two
== NULL
)
352 ECerr(EC_F_EC_ASN1_GROUP2FIELDID
, ERR_R_MALLOC_FAILURE
);
356 char_two
->m
= (long)EC_GROUP_get_degree(group
);
358 field_type
= EC_GROUP_get_basis_type(group
);
362 ECerr(EC_F_EC_ASN1_GROUP2FIELDID
, ERR_R_EC_LIB
);
365 /* set base type OID */
366 if ((char_two
->type
= OBJ_nid2obj(field_type
)) == NULL
)
368 ECerr(EC_F_EC_ASN1_GROUP2FIELDID
, ERR_R_OBJ_LIB
);
372 if (field_type
== NID_X9_62_tpBasis
)
376 if (!EC_GROUP_get_trinomial_basis(group
, &k
))
379 char_two
->p
.tpBasis
= ASN1_INTEGER_new();
380 if (!char_two
->p
.tpBasis
)
382 ECerr(EC_F_EC_ASN1_GROUP2FIELDID
, ERR_R_MALLOC_FAILURE
);
385 if (!ASN1_INTEGER_set(char_two
->p
.tpBasis
, (long)k
))
387 ECerr(EC_F_EC_ASN1_GROUP2FIELDID
,
392 else if (field_type
== NID_X9_62_ppBasis
)
394 unsigned int k1
, k2
, k3
;
396 if (!EC_GROUP_get_pentanomial_basis(group
, &k1
, &k2
, &k3
))
399 char_two
->p
.ppBasis
= X9_62_PENTANOMIAL_new();
400 if (!char_two
->p
.ppBasis
)
402 ECerr(EC_F_EC_ASN1_GROUP2FIELDID
, ERR_R_MALLOC_FAILURE
);
407 char_two
->p
.ppBasis
->k1
= (long)k1
;
408 char_two
->p
.ppBasis
->k2
= (long)k2
;
409 char_two
->p
.ppBasis
->k3
= (long)k3
;
411 else /* field_type == NID_X9_62_onBasis */
413 /* for ONB the parameters are (asn1) NULL */
414 char_two
->p
.onBasis
= ASN1_NULL_new();
415 if (!char_two
->p
.onBasis
)
417 ECerr(EC_F_EC_ASN1_GROUP2FIELDID
, ERR_R_MALLOC_FAILURE
);
430 static int ec_asn1_group2curve(const EC_GROUP
*group
, X9_62_CURVE
*curve
)
433 BIGNUM
*tmp_1
=NULL
, *tmp_2
=NULL
;
434 unsigned char *buffer_1
=NULL
, *buffer_2
=NULL
,
435 *a_buf
=NULL
, *b_buf
=NULL
;
437 unsigned char char_zero
= 0;
439 if (!group
|| !curve
|| !curve
->a
|| !curve
->b
)
442 if ((tmp_1
= BN_new()) == NULL
|| (tmp_2
= BN_new()) == NULL
)
444 ECerr(EC_F_EC_ASN1_GROUP2CURVE
, ERR_R_MALLOC_FAILURE
);
448 nid
= EC_METHOD_get_field_type(EC_GROUP_method_of(group
));
451 if (nid
== NID_X9_62_prime_field
)
453 if (!EC_GROUP_get_curve_GFp(group
, NULL
, tmp_1
, tmp_2
, NULL
))
455 ECerr(EC_F_EC_ASN1_GROUP2CURVE
, ERR_R_EC_LIB
);
459 else /* nid == NID_X9_62_characteristic_two_field */
461 if (!EC_GROUP_get_curve_GF2m(group
, NULL
, tmp_1
, tmp_2
, NULL
))
463 ECerr(EC_F_EC_ASN1_GROUP2CURVE
, ERR_R_EC_LIB
);
468 len_1
= (size_t)BN_num_bytes(tmp_1
);
469 len_2
= (size_t)BN_num_bytes(tmp_2
);
473 /* len_1 == 0 => a == 0 */
479 if ((buffer_1
= OPENSSL_malloc(len_1
)) == NULL
)
481 ECerr(EC_F_EC_ASN1_GROUP2CURVE
,
482 ERR_R_MALLOC_FAILURE
);
485 if ( (len_1
= BN_bn2bin(tmp_1
, buffer_1
)) == 0)
487 ECerr(EC_F_EC_ASN1_GROUP2CURVE
, ERR_R_BN_LIB
);
495 /* len_2 == 0 => b == 0 */
501 if ((buffer_2
= OPENSSL_malloc(len_2
)) == NULL
)
503 ECerr(EC_F_EC_ASN1_GROUP2CURVE
,
504 ERR_R_MALLOC_FAILURE
);
507 if ( (len_2
= BN_bn2bin(tmp_2
, buffer_2
)) == 0)
509 ECerr(EC_F_EC_ASN1_GROUP2CURVE
, ERR_R_BN_LIB
);
516 if (!M_ASN1_OCTET_STRING_set(curve
->a
, a_buf
, len_1
) ||
517 !M_ASN1_OCTET_STRING_set(curve
->b
, b_buf
, len_2
))
519 ECerr(EC_F_EC_ASN1_GROUP2CURVE
, ERR_R_ASN1_LIB
);
523 /* set the seed (optional) */
527 if ((curve
->seed
= ASN1_BIT_STRING_new()) == NULL
)
529 ECerr(EC_F_EC_ASN1_GROUP2CURVE
, ERR_R_MALLOC_FAILURE
);
532 curve
->seed
->flags
&= ~(ASN1_STRING_FLAG_BITS_LEFT
|0x07);
533 curve
->seed
->flags
|= ASN1_STRING_FLAG_BITS_LEFT
;
534 if (!ASN1_BIT_STRING_set(curve
->seed
, group
->seed
,
535 (int)group
->seed_len
))
537 ECerr(EC_F_EC_ASN1_GROUP2CURVE
, ERR_R_ASN1_LIB
);
545 ASN1_BIT_STRING_free(curve
->seed
);
553 OPENSSL_free(buffer_1
);
555 OPENSSL_free(buffer_2
);
563 static ECPARAMETERS
*ec_asn1_group2parameters(const EC_GROUP
*group
,
568 ECPARAMETERS
*ret
=NULL
;
570 unsigned char *buffer
=NULL
;
571 const EC_POINT
*point
=NULL
;
572 point_conversion_form_t form
;
574 if ((tmp
= BN_new()) == NULL
)
576 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS
, ERR_R_MALLOC_FAILURE
);
582 if ((ret
= ECPARAMETERS_new()) == NULL
)
584 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS
,
585 ERR_R_MALLOC_FAILURE
);
592 /* set the version (always one) */
593 ret
->version
= (long)0x1;
595 /* set the fieldID */
596 if (!ec_asn1_group2fieldid(group
, ret
->fieldID
))
598 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS
, ERR_R_EC_LIB
);
603 if (!ec_asn1_group2curve(group
, ret
->curve
))
605 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS
, ERR_R_EC_LIB
);
609 /* set the base point */
610 if ((point
= EC_GROUP_get0_generator(group
)) == NULL
)
612 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS
, EC_R_UNDEFINED_GENERATOR
);
616 form
= EC_GROUP_get_point_conversion_form(group
);
618 len
= EC_POINT_point2oct(group
, point
, form
, NULL
, len
, NULL
);
621 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS
, ERR_R_EC_LIB
);
624 if ((buffer
= OPENSSL_malloc(len
)) == NULL
)
626 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS
, ERR_R_MALLOC_FAILURE
);
629 if (!EC_POINT_point2oct(group
, point
, form
, buffer
, len
, NULL
))
631 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS
, ERR_R_EC_LIB
);
634 if (ret
->base
== NULL
&& (ret
->base
= ASN1_OCTET_STRING_new()) == NULL
)
636 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS
, ERR_R_MALLOC_FAILURE
);
639 if (!ASN1_OCTET_STRING_set(ret
->base
, buffer
, len
))
641 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS
, ERR_R_ASN1_LIB
);
646 if (!EC_GROUP_get_order(group
, tmp
, NULL
))
648 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS
, ERR_R_EC_LIB
);
651 ret
->order
= BN_to_ASN1_INTEGER(tmp
, ret
->order
);
652 if (ret
->order
== NULL
)
654 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS
, ERR_R_ASN1_LIB
);
658 /* set the cofactor (optional) */
659 if (EC_GROUP_get_cofactor(group
, tmp
, NULL
))
661 ret
->cofactor
= BN_to_ASN1_INTEGER(tmp
, ret
->cofactor
);
662 if (ret
->cofactor
== NULL
)
664 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS
, ERR_R_ASN1_LIB
);
674 ECPARAMETERS_free(ret
);
680 OPENSSL_free(buffer
);
684 ECPKPARAMETERS
*ec_asn1_group2pkparameters(const EC_GROUP
*group
,
685 ECPKPARAMETERS
*params
)
688 ECPKPARAMETERS
*ret
= params
;
692 if ((ret
= ECPKPARAMETERS_new()) == NULL
)
694 ECerr(EC_F_EC_ASN1_GROUP2PKPARAMETERS
,
695 ERR_R_MALLOC_FAILURE
);
701 if (ret
->type
== 0 && ret
->value
.named_curve
)
702 ASN1_OBJECT_free(ret
->value
.named_curve
);
703 else if (ret
->type
== 1 && ret
->value
.parameters
)
704 ECPARAMETERS_free(ret
->value
.parameters
);
707 if (EC_GROUP_get_asn1_flag(group
))
709 /* use the asn1 OID to describe the
710 * the elliptic curve parameters
712 tmp
= EC_GROUP_get_curve_name(group
);
716 if ((ret
->value
.named_curve
= OBJ_nid2obj(tmp
)) == NULL
)
720 /* we don't kmow the nid => ERROR */
725 /* use the ECPARAMETERS structure */
727 if ((ret
->value
.parameters
= ec_asn1_group2parameters(
728 group
, NULL
)) == NULL
)
734 ECPKPARAMETERS_free(ret
);
740 static EC_GROUP
*ec_asn1_parameters2group(const ECPARAMETERS
*params
)
743 EC_GROUP
*ret
= NULL
;
744 BIGNUM
*p
= NULL
, *a
= NULL
, *b
= NULL
;
745 EC_POINT
*point
=NULL
;
748 if (!params
->fieldID
|| !params
->fieldID
->fieldType
||
749 !params
->fieldID
->p
.ptr
)
751 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP
, EC_R_ASN1_ERROR
);
755 /* now extract the curve parameters a and b */
756 if (!params
->curve
|| !params
->curve
->a
||
757 !params
->curve
->a
->data
|| !params
->curve
->b
||
758 !params
->curve
->b
->data
)
760 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP
, EC_R_ASN1_ERROR
);
763 a
= BN_bin2bn(params
->curve
->a
->data
, params
->curve
->a
->length
, NULL
);
766 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP
, ERR_R_BN_LIB
);
769 b
= BN_bin2bn(params
->curve
->b
->data
, params
->curve
->b
->length
, NULL
);
772 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP
, ERR_R_BN_LIB
);
776 /* get the field parameters */
777 tmp
= OBJ_obj2nid(params
->fieldID
->fieldType
);
779 if (tmp
== NID_X9_62_characteristic_two_field
)
781 X9_62_CHARACTERISTIC_TWO
*char_two
;
783 char_two
= params
->fieldID
->p
.char_two
;
785 field_bits
= char_two
->m
;
786 if (field_bits
> OPENSSL_ECC_MAX_FIELD_BITS
)
788 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP
, EC_R_FIELD_TOO_LARGE
);
792 if ((p
= BN_new()) == NULL
)
794 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP
, ERR_R_MALLOC_FAILURE
);
798 /* get the base type */
799 tmp
= OBJ_obj2nid(char_two
->type
);
801 if (tmp
== NID_X9_62_tpBasis
)
805 if (!char_two
->p
.tpBasis
)
807 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP
, EC_R_ASN1_ERROR
);
811 tmp_long
= ASN1_INTEGER_get(char_two
->p
.tpBasis
);
813 if (!(char_two
->m
> tmp_long
&& tmp_long
> 0))
815 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP
, EC_R_INVALID_TRINOMIAL_BASIS
);
819 /* create the polynomial */
820 if (!BN_set_bit(p
, (int)char_two
->m
))
822 if (!BN_set_bit(p
, (int)tmp_long
))
824 if (!BN_set_bit(p
, 0))
827 else if (tmp
== NID_X9_62_ppBasis
)
829 X9_62_PENTANOMIAL
*penta
;
831 penta
= char_two
->p
.ppBasis
;
834 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP
, EC_R_ASN1_ERROR
);
838 if (!(char_two
->m
> penta
->k3
&& penta
->k3
> penta
->k2
&& penta
->k2
> penta
->k1
&& penta
->k1
> 0))
840 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP
, EC_R_INVALID_PENTANOMIAL_BASIS
);
844 /* create the polynomial */
845 if (!BN_set_bit(p
, (int)char_two
->m
)) goto err
;
846 if (!BN_set_bit(p
, (int)penta
->k1
)) goto err
;
847 if (!BN_set_bit(p
, (int)penta
->k2
)) goto err
;
848 if (!BN_set_bit(p
, (int)penta
->k3
)) goto err
;
849 if (!BN_set_bit(p
, 0)) goto err
;
851 else if (tmp
== NID_X9_62_onBasis
)
853 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP
, EC_R_NOT_IMPLEMENTED
);
858 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP
, EC_R_ASN1_ERROR
);
862 /* create the EC_GROUP structure */
863 ret
= EC_GROUP_new_curve_GF2m(p
, a
, b
, NULL
);
865 else if (tmp
== NID_X9_62_prime_field
)
867 /* we have a curve over a prime field */
868 /* extract the prime number */
869 if (!params
->fieldID
->p
.prime
)
871 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP
, EC_R_ASN1_ERROR
);
874 p
= ASN1_INTEGER_to_BN(params
->fieldID
->p
.prime
, NULL
);
877 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP
, ERR_R_ASN1_LIB
);
881 if (BN_is_negative(p
) || BN_is_zero(p
))
883 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP
, EC_R_INVALID_FIELD
);
887 field_bits
= BN_num_bits(p
);
888 if (field_bits
> OPENSSL_ECC_MAX_FIELD_BITS
)
890 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP
, EC_R_FIELD_TOO_LARGE
);
894 /* create the EC_GROUP structure */
895 ret
= EC_GROUP_new_curve_GFp(p
, a
, b
, NULL
);
899 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP
, EC_R_INVALID_FIELD
);
905 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP
, ERR_R_EC_LIB
);
909 /* extract seed (optional) */
910 if (params
->curve
->seed
!= NULL
)
912 if (ret
->seed
!= NULL
)
913 OPENSSL_free(ret
->seed
);
914 if (!(ret
->seed
= OPENSSL_malloc(params
->curve
->seed
->length
)))
916 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP
,
917 ERR_R_MALLOC_FAILURE
);
920 memcpy(ret
->seed
, params
->curve
->seed
->data
,
921 params
->curve
->seed
->length
);
922 ret
->seed_len
= params
->curve
->seed
->length
;
925 if (!params
->order
|| !params
->base
|| !params
->base
->data
)
927 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP
, EC_R_ASN1_ERROR
);
931 if ((point
= EC_POINT_new(ret
)) == NULL
) goto err
;
933 /* set the point conversion form */
934 EC_GROUP_set_point_conversion_form(ret
, (point_conversion_form_t
)
935 (params
->base
->data
[0] & ~0x01));
937 /* extract the ec point */
938 if (!EC_POINT_oct2point(ret
, point
, params
->base
->data
,
939 params
->base
->length
, NULL
))
941 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP
, ERR_R_EC_LIB
);
945 /* extract the order */
946 if ((a
= ASN1_INTEGER_to_BN(params
->order
, a
)) == NULL
)
948 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP
, ERR_R_ASN1_LIB
);
951 if (BN_is_negative(a
) || BN_is_zero(a
))
953 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP
, EC_R_INVALID_GROUP_ORDER
);
956 if (BN_num_bits(a
) > (int)field_bits
+ 1) /* Hasse bound */
958 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP
, EC_R_INVALID_GROUP_ORDER
);
962 /* extract the cofactor (optional) */
963 if (params
->cofactor
== NULL
)
972 if ((b
= ASN1_INTEGER_to_BN(params
->cofactor
, b
)) == NULL
)
974 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP
, ERR_R_ASN1_LIB
);
977 /* set the generator, order and cofactor (if present) */
978 if (!EC_GROUP_set_generator(ret
, point
, a
, b
))
980 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP
, ERR_R_EC_LIB
);
989 EC_GROUP_clear_free(ret
);
1000 EC_POINT_free(point
);
1004 EC_GROUP
*ec_asn1_pkparameters2group(const ECPKPARAMETERS
*params
)
1011 ECerr(EC_F_EC_ASN1_PKPARAMETERS2GROUP
,
1012 EC_R_MISSING_PARAMETERS
);
1016 if (params
->type
== 0)
1017 { /* the curve is given by an OID */
1018 tmp
= OBJ_obj2nid(params
->value
.named_curve
);
1019 if ((ret
= EC_GROUP_new_by_curve_name(tmp
)) == NULL
)
1021 ECerr(EC_F_EC_ASN1_PKPARAMETERS2GROUP
,
1022 EC_R_EC_GROUP_NEW_BY_NAME_FAILURE
);
1025 EC_GROUP_set_asn1_flag(ret
, OPENSSL_EC_NAMED_CURVE
);
1027 else if (params
->type
== 1)
1028 { /* the parameters are given by a ECPARAMETERS
1030 ret
= ec_asn1_parameters2group(params
->value
.parameters
);
1033 ECerr(EC_F_EC_ASN1_PKPARAMETERS2GROUP
, ERR_R_EC_LIB
);
1036 EC_GROUP_set_asn1_flag(ret
, 0x0);
1038 else if (params
->type
== 2)
1039 { /* implicitlyCA */
1044 ECerr(EC_F_EC_ASN1_PKPARAMETERS2GROUP
, EC_R_ASN1_ERROR
);
1051 /* EC_GROUP <-> DER encoding of ECPKPARAMETERS */
1053 EC_GROUP
*d2i_ECPKParameters(EC_GROUP
**a
, const unsigned char **in
, long len
)
1055 EC_GROUP
*group
= NULL
;
1056 ECPKPARAMETERS
*params
= NULL
;
1058 if ((params
= d2i_ECPKPARAMETERS(NULL
, in
, len
)) == NULL
)
1060 ECerr(EC_F_D2I_ECPKPARAMETERS
, EC_R_D2I_ECPKPARAMETERS_FAILURE
);
1061 ECPKPARAMETERS_free(params
);
1065 if ((group
= ec_asn1_pkparameters2group(params
)) == NULL
)
1067 ECerr(EC_F_D2I_ECPKPARAMETERS
, EC_R_PKPARAMETERS2GROUP_FAILURE
);
1073 EC_GROUP_clear_free(*a
);
1077 ECPKPARAMETERS_free(params
);
1081 int i2d_ECPKParameters(const EC_GROUP
*a
, unsigned char **out
)
1084 ECPKPARAMETERS
*tmp
= ec_asn1_group2pkparameters(a
, NULL
);
1087 ECerr(EC_F_I2D_ECPKPARAMETERS
, EC_R_GROUP2PKPARAMETERS_FAILURE
);
1090 if ((ret
= i2d_ECPKPARAMETERS(tmp
, out
)) == 0)
1092 ECerr(EC_F_I2D_ECPKPARAMETERS
, EC_R_I2D_ECPKPARAMETERS_FAILURE
);
1093 ECPKPARAMETERS_free(tmp
);
1096 ECPKPARAMETERS_free(tmp
);
1100 /* some EC_KEY functions */
1102 EC_KEY
*d2i_ECPrivateKey(EC_KEY
**a
, const unsigned char **in
, long len
)
1106 EC_PRIVATEKEY
*priv_key
=NULL
;
1108 if ((priv_key
= EC_PRIVATEKEY_new()) == NULL
)
1110 ECerr(EC_F_D2I_ECPRIVATEKEY
, ERR_R_MALLOC_FAILURE
);
1114 if ((priv_key
= d2i_EC_PRIVATEKEY(&priv_key
, in
, len
)) == NULL
)
1116 ECerr(EC_F_D2I_ECPRIVATEKEY
, ERR_R_EC_LIB
);
1117 EC_PRIVATEKEY_free(priv_key
);
1121 if (a
== NULL
|| *a
== NULL
)
1123 if ((ret
= EC_KEY_new()) == NULL
)
1125 ECerr(EC_F_D2I_ECPRIVATEKEY
,
1126 ERR_R_MALLOC_FAILURE
);
1135 if (priv_key
->parameters
)
1138 EC_GROUP_clear_free(ret
->group
);
1139 ret
->group
= ec_asn1_pkparameters2group(priv_key
->parameters
);
1142 if (ret
->group
== NULL
)
1144 ECerr(EC_F_D2I_ECPRIVATEKEY
, ERR_R_EC_LIB
);
1148 ret
->version
= priv_key
->version
;
1150 if (priv_key
->privateKey
)
1152 ret
->priv_key
= BN_bin2bn(
1153 M_ASN1_STRING_data(priv_key
->privateKey
),
1154 M_ASN1_STRING_length(priv_key
->privateKey
),
1156 if (ret
->priv_key
== NULL
)
1158 ECerr(EC_F_D2I_ECPRIVATEKEY
,
1165 ECerr(EC_F_D2I_ECPRIVATEKEY
,
1166 EC_R_MISSING_PRIVATE_KEY
);
1170 if (priv_key
->publicKey
)
1172 const unsigned char *pub_oct
;
1176 EC_POINT_clear_free(ret
->pub_key
);
1177 ret
->pub_key
= EC_POINT_new(ret
->group
);
1178 if (ret
->pub_key
== NULL
)
1180 ECerr(EC_F_D2I_ECPRIVATEKEY
, ERR_R_EC_LIB
);
1183 pub_oct
= M_ASN1_STRING_data(priv_key
->publicKey
);
1184 pub_oct_len
= M_ASN1_STRING_length(priv_key
->publicKey
);
1185 /* save the point conversion form */
1186 ret
->conv_form
= (point_conversion_form_t
)(pub_oct
[0] & ~0x01);
1187 if (!EC_POINT_oct2point(ret
->group
, ret
->pub_key
,
1188 pub_oct
, pub_oct_len
, NULL
))
1190 ECerr(EC_F_D2I_ECPRIVATEKEY
, ERR_R_EC_LIB
);
1205 EC_PRIVATEKEY_free(priv_key
);
1210 int i2d_ECPrivateKey(EC_KEY
*a
, unsigned char **out
)
1213 unsigned char *buffer
=NULL
;
1214 size_t buf_len
=0, tmp_len
;
1215 EC_PRIVATEKEY
*priv_key
=NULL
;
1217 if (a
== NULL
|| a
->group
== NULL
|| a
->priv_key
== NULL
)
1219 ECerr(EC_F_I2D_ECPRIVATEKEY
,
1220 ERR_R_PASSED_NULL_PARAMETER
);
1224 if ((priv_key
= EC_PRIVATEKEY_new()) == NULL
)
1226 ECerr(EC_F_I2D_ECPRIVATEKEY
,
1227 ERR_R_MALLOC_FAILURE
);
1231 priv_key
->version
= a
->version
;
1233 buf_len
= (size_t)BN_num_bytes(a
->priv_key
);
1234 buffer
= OPENSSL_malloc(buf_len
);
1237 ECerr(EC_F_I2D_ECPRIVATEKEY
,
1238 ERR_R_MALLOC_FAILURE
);
1242 if (!BN_bn2bin(a
->priv_key
, buffer
))
1244 ECerr(EC_F_I2D_ECPRIVATEKEY
, ERR_R_BN_LIB
);
1248 if (!M_ASN1_OCTET_STRING_set(priv_key
->privateKey
, buffer
, buf_len
))
1250 ECerr(EC_F_I2D_ECPRIVATEKEY
, ERR_R_ASN1_LIB
);
1254 if (!(a
->enc_flag
& EC_PKEY_NO_PARAMETERS
))
1256 if ((priv_key
->parameters
= ec_asn1_group2pkparameters(
1257 a
->group
, priv_key
->parameters
)) == NULL
)
1259 ECerr(EC_F_I2D_ECPRIVATEKEY
, ERR_R_EC_LIB
);
1264 if (!(a
->enc_flag
& EC_PKEY_NO_PUBKEY
))
1266 priv_key
->publicKey
= M_ASN1_BIT_STRING_new();
1267 if (priv_key
->publicKey
== NULL
)
1269 ECerr(EC_F_I2D_ECPRIVATEKEY
,
1270 ERR_R_MALLOC_FAILURE
);
1274 tmp_len
= EC_POINT_point2oct(a
->group
, a
->pub_key
,
1275 a
->conv_form
, NULL
, 0, NULL
);
1277 if (tmp_len
> buf_len
)
1279 unsigned char *tmp_buffer
= OPENSSL_realloc(buffer
, tmp_len
);
1282 ECerr(EC_F_I2D_ECPRIVATEKEY
, ERR_R_MALLOC_FAILURE
);
1285 buffer
= tmp_buffer
;
1289 if (!EC_POINT_point2oct(a
->group
, a
->pub_key
,
1290 a
->conv_form
, buffer
, buf_len
, NULL
))
1292 ECerr(EC_F_I2D_ECPRIVATEKEY
, ERR_R_EC_LIB
);
1296 priv_key
->publicKey
->flags
&= ~(ASN1_STRING_FLAG_BITS_LEFT
|0x07);
1297 priv_key
->publicKey
->flags
|= ASN1_STRING_FLAG_BITS_LEFT
;
1298 if (!M_ASN1_BIT_STRING_set(priv_key
->publicKey
, buffer
,
1301 ECerr(EC_F_I2D_ECPRIVATEKEY
, ERR_R_ASN1_LIB
);
1306 if ((ret
= i2d_EC_PRIVATEKEY(priv_key
, out
)) == 0)
1308 ECerr(EC_F_I2D_ECPRIVATEKEY
, ERR_R_EC_LIB
);
1314 OPENSSL_free(buffer
);
1316 EC_PRIVATEKEY_free(priv_key
);
1320 int i2d_ECParameters(EC_KEY
*a
, unsigned char **out
)
1324 ECerr(EC_F_I2D_ECPARAMETERS
, ERR_R_PASSED_NULL_PARAMETER
);
1327 return i2d_ECPKParameters(a
->group
, out
);
1330 EC_KEY
*d2i_ECParameters(EC_KEY
**a
, const unsigned char **in
, long len
)
1334 if (in
== NULL
|| *in
== NULL
)
1336 ECerr(EC_F_D2I_ECPARAMETERS
, ERR_R_PASSED_NULL_PARAMETER
);
1340 if (a
== NULL
|| *a
== NULL
)
1342 if ((ret
= EC_KEY_new()) == NULL
)
1344 ECerr(EC_F_D2I_ECPARAMETERS
, ERR_R_MALLOC_FAILURE
);
1353 if (!d2i_ECPKParameters(&ret
->group
, in
, len
))
1355 ECerr(EC_F_D2I_ECPARAMETERS
, ERR_R_EC_LIB
);
1362 EC_KEY
*o2i_ECPublicKey(EC_KEY
**a
, const unsigned char **in
, long len
)
1366 if (a
== NULL
|| (*a
) == NULL
|| (*a
)->group
== NULL
)
1368 /* sorry, but a EC_GROUP-structur is necessary
1369 * to set the public key */
1370 ECerr(EC_F_O2I_ECPUBLICKEY
, ERR_R_PASSED_NULL_PARAMETER
);
1374 if (ret
->pub_key
== NULL
&&
1375 (ret
->pub_key
= EC_POINT_new(ret
->group
)) == NULL
)
1377 ECerr(EC_F_O2I_ECPUBLICKEY
, ERR_R_MALLOC_FAILURE
);
1380 if (!EC_POINT_oct2point(ret
->group
, ret
->pub_key
, *in
, len
, NULL
))
1382 ECerr(EC_F_O2I_ECPUBLICKEY
, ERR_R_EC_LIB
);
1385 /* save the point conversion form */
1386 ret
->conv_form
= (point_conversion_form_t
)(*in
[0] & ~0x01);
1391 int i2o_ECPublicKey(EC_KEY
*a
, unsigned char **out
)
1398 ECerr(EC_F_I2O_ECPUBLICKEY
, ERR_R_PASSED_NULL_PARAMETER
);
1402 buf_len
= EC_POINT_point2oct(a
->group
, a
->pub_key
,
1403 a
->conv_form
, NULL
, 0, NULL
);
1405 if (out
== NULL
|| buf_len
== 0)
1406 /* out == NULL => just return the length of the octet string */
1411 if ((*out
= OPENSSL_malloc(buf_len
)) == NULL
)
1413 ECerr(EC_F_I2O_ECPUBLICKEY
, ERR_R_MALLOC_FAILURE
);
1418 if (!EC_POINT_point2oct(a
->group
, a
->pub_key
, a
->conv_form
,
1419 *out
, buf_len
, NULL
))
1421 ECerr(EC_F_I2O_ECPUBLICKEY
, ERR_R_EC_LIB
);