2 * Copyright 2002-2018 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the Apache License 2.0 (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
12 #include <openssl/err.h>
13 #include <openssl/asn1t.h>
14 #include <openssl/objects.h>
15 #include "internal/nelem.h"
16 #include "crypto/asn1_dsa.h"
20 int EC_GROUP_get_basis_type(const EC_GROUP
*group
)
24 if (EC_METHOD_get_field_type(EC_GROUP_method_of(group
)) !=
25 NID_X9_62_characteristic_two_field
)
26 /* everything else is currently not supported */
29 /* Find the last non-zero element of group->poly[] */
31 i
< (int)OSSL_NELEM(group
->poly
) && group
->poly
[i
] != 0;
36 return NID_X9_62_ppBasis
;
38 return NID_X9_62_tpBasis
;
40 /* everything else is currently not supported */
44 #ifndef OPENSSL_NO_EC2M
45 int EC_GROUP_get_trinomial_basis(const EC_GROUP
*group
, unsigned int *k
)
50 if (EC_METHOD_get_field_type(EC_GROUP_method_of(group
)) !=
51 NID_X9_62_characteristic_two_field
52 || !((group
->poly
[0] != 0) && (group
->poly
[1] != 0)
53 && (group
->poly
[2] == 0))) {
54 ECerr(EC_F_EC_GROUP_GET_TRINOMIAL_BASIS
,
55 ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED
);
65 int EC_GROUP_get_pentanomial_basis(const EC_GROUP
*group
, unsigned int *k1
,
66 unsigned int *k2
, unsigned int *k3
)
71 if (EC_METHOD_get_field_type(EC_GROUP_method_of(group
)) !=
72 NID_X9_62_characteristic_two_field
73 || !((group
->poly
[0] != 0) && (group
->poly
[1] != 0)
74 && (group
->poly
[2] != 0) && (group
->poly
[3] != 0)
75 && (group
->poly
[4] == 0))) {
76 ECerr(EC_F_EC_GROUP_GET_PENTANOMIAL_BASIS
,
77 ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED
);
92 /* some structures needed for the asn1 encoding */
93 typedef struct x9_62_pentanomial_st
{
99 typedef struct x9_62_characteristic_two_st
{
104 /* NID_X9_62_onBasis */
106 /* NID_X9_62_tpBasis */
107 ASN1_INTEGER
*tpBasis
;
108 /* NID_X9_62_ppBasis */
109 X9_62_PENTANOMIAL
*ppBasis
;
113 } X9_62_CHARACTERISTIC_TWO
;
115 typedef struct x9_62_fieldid_st
{
116 ASN1_OBJECT
*fieldType
;
119 /* NID_X9_62_prime_field */
121 /* NID_X9_62_characteristic_two_field */
122 X9_62_CHARACTERISTIC_TWO
*char_two
;
128 typedef struct x9_62_curve_st
{
129 ASN1_OCTET_STRING
*a
;
130 ASN1_OCTET_STRING
*b
;
131 ASN1_BIT_STRING
*seed
;
134 struct ec_parameters_st
{
136 X9_62_FIELDID
*fieldID
;
138 ASN1_OCTET_STRING
*base
;
140 ASN1_INTEGER
*cofactor
;
141 } /* ECPARAMETERS */ ;
143 struct ecpk_parameters_st
{
146 ASN1_OBJECT
*named_curve
;
147 ECPARAMETERS
*parameters
;
148 ASN1_NULL
*implicitlyCA
;
150 } /* ECPKPARAMETERS */ ;
152 /* SEC1 ECPrivateKey */
153 typedef struct ec_privatekey_st
{
155 ASN1_OCTET_STRING
*privateKey
;
156 ECPKPARAMETERS
*parameters
;
157 ASN1_BIT_STRING
*publicKey
;
160 /* the OpenSSL ASN.1 definitions */
161 ASN1_SEQUENCE(X9_62_PENTANOMIAL
) = {
162 ASN1_EMBED(X9_62_PENTANOMIAL
, k1
, INT32
),
163 ASN1_EMBED(X9_62_PENTANOMIAL
, k2
, INT32
),
164 ASN1_EMBED(X9_62_PENTANOMIAL
, k3
, INT32
)
165 } static_ASN1_SEQUENCE_END(X9_62_PENTANOMIAL
)
167 DECLARE_ASN1_ALLOC_FUNCTIONS(X9_62_PENTANOMIAL
)
168 IMPLEMENT_ASN1_ALLOC_FUNCTIONS(X9_62_PENTANOMIAL
)
170 ASN1_ADB_TEMPLATE(char_two_def
) = ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO
, p
.other
, ASN1_ANY
);
172 ASN1_ADB(X9_62_CHARACTERISTIC_TWO
) = {
173 ADB_ENTRY(NID_X9_62_onBasis
, ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO
, p
.onBasis
, ASN1_NULL
)),
174 ADB_ENTRY(NID_X9_62_tpBasis
, ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO
, p
.tpBasis
, ASN1_INTEGER
)),
175 ADB_ENTRY(NID_X9_62_ppBasis
, ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO
, p
.ppBasis
, X9_62_PENTANOMIAL
))
176 } ASN1_ADB_END(X9_62_CHARACTERISTIC_TWO
, 0, type
, 0, &char_two_def_tt
, NULL
);
178 ASN1_SEQUENCE(X9_62_CHARACTERISTIC_TWO
) = {
179 ASN1_EMBED(X9_62_CHARACTERISTIC_TWO
, m
, INT32
),
180 ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO
, type
, ASN1_OBJECT
),
181 ASN1_ADB_OBJECT(X9_62_CHARACTERISTIC_TWO
)
182 } static_ASN1_SEQUENCE_END(X9_62_CHARACTERISTIC_TWO
)
184 DECLARE_ASN1_ALLOC_FUNCTIONS(X9_62_CHARACTERISTIC_TWO
)
185 IMPLEMENT_ASN1_ALLOC_FUNCTIONS(X9_62_CHARACTERISTIC_TWO
)
187 ASN1_ADB_TEMPLATE(fieldID_def
) = ASN1_SIMPLE(X9_62_FIELDID
, p
.other
, ASN1_ANY
);
189 ASN1_ADB(X9_62_FIELDID
) = {
190 ADB_ENTRY(NID_X9_62_prime_field
, ASN1_SIMPLE(X9_62_FIELDID
, p
.prime
, ASN1_INTEGER
)),
191 ADB_ENTRY(NID_X9_62_characteristic_two_field
, ASN1_SIMPLE(X9_62_FIELDID
, p
.char_two
, X9_62_CHARACTERISTIC_TWO
))
192 } ASN1_ADB_END(X9_62_FIELDID
, 0, fieldType
, 0, &fieldID_def_tt
, NULL
);
194 ASN1_SEQUENCE(X9_62_FIELDID
) = {
195 ASN1_SIMPLE(X9_62_FIELDID
, fieldType
, ASN1_OBJECT
),
196 ASN1_ADB_OBJECT(X9_62_FIELDID
)
197 } static_ASN1_SEQUENCE_END(X9_62_FIELDID
)
199 ASN1_SEQUENCE(X9_62_CURVE
) = {
200 ASN1_SIMPLE(X9_62_CURVE
, a
, ASN1_OCTET_STRING
),
201 ASN1_SIMPLE(X9_62_CURVE
, b
, ASN1_OCTET_STRING
),
202 ASN1_OPT(X9_62_CURVE
, seed
, ASN1_BIT_STRING
)
203 } static_ASN1_SEQUENCE_END(X9_62_CURVE
)
205 ASN1_SEQUENCE(ECPARAMETERS
) = {
206 ASN1_EMBED(ECPARAMETERS
, version
, INT32
),
207 ASN1_SIMPLE(ECPARAMETERS
, fieldID
, X9_62_FIELDID
),
208 ASN1_SIMPLE(ECPARAMETERS
, curve
, X9_62_CURVE
),
209 ASN1_SIMPLE(ECPARAMETERS
, base
, ASN1_OCTET_STRING
),
210 ASN1_SIMPLE(ECPARAMETERS
, order
, ASN1_INTEGER
),
211 ASN1_OPT(ECPARAMETERS
, cofactor
, ASN1_INTEGER
)
212 } ASN1_SEQUENCE_END(ECPARAMETERS
)
214 DECLARE_ASN1_ALLOC_FUNCTIONS(ECPARAMETERS
)
215 IMPLEMENT_ASN1_ALLOC_FUNCTIONS(ECPARAMETERS
)
217 ASN1_CHOICE(ECPKPARAMETERS
) = {
218 ASN1_SIMPLE(ECPKPARAMETERS
, value
.named_curve
, ASN1_OBJECT
),
219 ASN1_SIMPLE(ECPKPARAMETERS
, value
.parameters
, ECPARAMETERS
),
220 ASN1_SIMPLE(ECPKPARAMETERS
, value
.implicitlyCA
, ASN1_NULL
)
221 } ASN1_CHOICE_END(ECPKPARAMETERS
)
223 DECLARE_ASN1_FUNCTIONS(ECPKPARAMETERS
)
224 DECLARE_ASN1_ENCODE_FUNCTIONS_name(ECPKPARAMETERS
, ECPKPARAMETERS
)
225 IMPLEMENT_ASN1_FUNCTIONS(ECPKPARAMETERS
)
227 ASN1_SEQUENCE(EC_PRIVATEKEY
) = {
228 ASN1_EMBED(EC_PRIVATEKEY
, version
, INT32
),
229 ASN1_SIMPLE(EC_PRIVATEKEY
, privateKey
, ASN1_OCTET_STRING
),
230 ASN1_EXP_OPT(EC_PRIVATEKEY
, parameters
, ECPKPARAMETERS
, 0),
231 ASN1_EXP_OPT(EC_PRIVATEKEY
, publicKey
, ASN1_BIT_STRING
, 1)
232 } static_ASN1_SEQUENCE_END(EC_PRIVATEKEY
)
234 DECLARE_ASN1_FUNCTIONS(EC_PRIVATEKEY
)
235 DECLARE_ASN1_ENCODE_FUNCTIONS_name(EC_PRIVATEKEY
, EC_PRIVATEKEY
)
236 IMPLEMENT_ASN1_FUNCTIONS(EC_PRIVATEKEY
)
238 /* some declarations of internal function */
240 /* ec_asn1_group2field() sets the values in a X9_62_FIELDID object */
241 static int ec_asn1_group2fieldid(const EC_GROUP
*, X9_62_FIELDID
*);
242 /* ec_asn1_group2curve() sets the values in a X9_62_CURVE object */
243 static int ec_asn1_group2curve(const EC_GROUP
*, X9_62_CURVE
*);
245 /* the function definitions */
247 static int ec_asn1_group2fieldid(const EC_GROUP
*group
, X9_62_FIELDID
*field
)
252 if (group
== NULL
|| field
== NULL
)
255 /* clear the old values (if necessary) */
256 ASN1_OBJECT_free(field
->fieldType
);
257 ASN1_TYPE_free(field
->p
.other
);
259 nid
= EC_METHOD_get_field_type(EC_GROUP_method_of(group
));
260 /* set OID for the field */
261 if ((field
->fieldType
= OBJ_nid2obj(nid
)) == NULL
) {
262 ECerr(EC_F_EC_ASN1_GROUP2FIELDID
, ERR_R_OBJ_LIB
);
266 if (nid
== NID_X9_62_prime_field
) {
267 if ((tmp
= BN_new()) == NULL
) {
268 ECerr(EC_F_EC_ASN1_GROUP2FIELDID
, ERR_R_MALLOC_FAILURE
);
271 /* the parameters are specified by the prime number p */
272 if (!EC_GROUP_get_curve(group
, tmp
, NULL
, NULL
, NULL
)) {
273 ECerr(EC_F_EC_ASN1_GROUP2FIELDID
, ERR_R_EC_LIB
);
276 /* set the prime number */
277 field
->p
.prime
= BN_to_ASN1_INTEGER(tmp
, NULL
);
278 if (field
->p
.prime
== NULL
) {
279 ECerr(EC_F_EC_ASN1_GROUP2FIELDID
, ERR_R_ASN1_LIB
);
282 } else if (nid
== NID_X9_62_characteristic_two_field
)
283 #ifdef OPENSSL_NO_EC2M
285 ECerr(EC_F_EC_ASN1_GROUP2FIELDID
, EC_R_GF2M_NOT_SUPPORTED
);
291 X9_62_CHARACTERISTIC_TWO
*char_two
;
293 field
->p
.char_two
= X9_62_CHARACTERISTIC_TWO_new();
294 char_two
= field
->p
.char_two
;
296 if (char_two
== NULL
) {
297 ECerr(EC_F_EC_ASN1_GROUP2FIELDID
, ERR_R_MALLOC_FAILURE
);
301 char_two
->m
= (long)EC_GROUP_get_degree(group
);
303 field_type
= EC_GROUP_get_basis_type(group
);
305 if (field_type
== 0) {
306 ECerr(EC_F_EC_ASN1_GROUP2FIELDID
, ERR_R_EC_LIB
);
309 /* set base type OID */
310 if ((char_two
->type
= OBJ_nid2obj(field_type
)) == NULL
) {
311 ECerr(EC_F_EC_ASN1_GROUP2FIELDID
, ERR_R_OBJ_LIB
);
315 if (field_type
== NID_X9_62_tpBasis
) {
318 if (!EC_GROUP_get_trinomial_basis(group
, &k
))
321 char_two
->p
.tpBasis
= ASN1_INTEGER_new();
322 if (char_two
->p
.tpBasis
== NULL
) {
323 ECerr(EC_F_EC_ASN1_GROUP2FIELDID
, ERR_R_MALLOC_FAILURE
);
326 if (!ASN1_INTEGER_set(char_two
->p
.tpBasis
, (long)k
)) {
327 ECerr(EC_F_EC_ASN1_GROUP2FIELDID
, ERR_R_ASN1_LIB
);
330 } else if (field_type
== NID_X9_62_ppBasis
) {
331 unsigned int k1
, k2
, k3
;
333 if (!EC_GROUP_get_pentanomial_basis(group
, &k1
, &k2
, &k3
))
336 char_two
->p
.ppBasis
= X9_62_PENTANOMIAL_new();
337 if (char_two
->p
.ppBasis
== NULL
) {
338 ECerr(EC_F_EC_ASN1_GROUP2FIELDID
, ERR_R_MALLOC_FAILURE
);
343 char_two
->p
.ppBasis
->k1
= (long)k1
;
344 char_two
->p
.ppBasis
->k2
= (long)k2
;
345 char_two
->p
.ppBasis
->k3
= (long)k3
;
346 } else { /* field_type == NID_X9_62_onBasis */
348 /* for ONB the parameters are (asn1) NULL */
349 char_two
->p
.onBasis
= ASN1_NULL_new();
350 if (char_two
->p
.onBasis
== NULL
) {
351 ECerr(EC_F_EC_ASN1_GROUP2FIELDID
, ERR_R_MALLOC_FAILURE
);
358 ECerr(EC_F_EC_ASN1_GROUP2FIELDID
, EC_R_UNSUPPORTED_FIELD
);
369 static int ec_asn1_group2curve(const EC_GROUP
*group
, X9_62_CURVE
*curve
)
372 BIGNUM
*tmp_1
= NULL
, *tmp_2
= NULL
;
373 unsigned char *a_buf
= NULL
, *b_buf
= NULL
;
376 if (!group
|| !curve
|| !curve
->a
|| !curve
->b
)
379 if ((tmp_1
= BN_new()) == NULL
|| (tmp_2
= BN_new()) == NULL
) {
380 ECerr(EC_F_EC_ASN1_GROUP2CURVE
, ERR_R_MALLOC_FAILURE
);
385 if (!EC_GROUP_get_curve(group
, NULL
, tmp_1
, tmp_2
, NULL
)) {
386 ECerr(EC_F_EC_ASN1_GROUP2CURVE
, ERR_R_EC_LIB
);
391 * Per SEC 1, the curve coefficients must be padded up to size. See C.2's
392 * definition of Curve, C.1's definition of FieldElement, and 2.3.5's
393 * definition of how to encode the field elements.
395 len
= ((size_t)EC_GROUP_get_degree(group
) + 7) / 8;
396 if ((a_buf
= OPENSSL_malloc(len
)) == NULL
397 || (b_buf
= OPENSSL_malloc(len
)) == NULL
) {
398 ECerr(EC_F_EC_ASN1_GROUP2CURVE
, ERR_R_MALLOC_FAILURE
);
401 if (BN_bn2binpad(tmp_1
, a_buf
, len
) < 0
402 || BN_bn2binpad(tmp_2
, b_buf
, len
) < 0) {
403 ECerr(EC_F_EC_ASN1_GROUP2CURVE
, ERR_R_BN_LIB
);
408 if (!ASN1_OCTET_STRING_set(curve
->a
, a_buf
, len
)
409 || !ASN1_OCTET_STRING_set(curve
->b
, b_buf
, len
)) {
410 ECerr(EC_F_EC_ASN1_GROUP2CURVE
, ERR_R_ASN1_LIB
);
414 /* set the seed (optional) */
417 if ((curve
->seed
= ASN1_BIT_STRING_new()) == NULL
) {
418 ECerr(EC_F_EC_ASN1_GROUP2CURVE
, ERR_R_MALLOC_FAILURE
);
421 curve
->seed
->flags
&= ~(ASN1_STRING_FLAG_BITS_LEFT
| 0x07);
422 curve
->seed
->flags
|= ASN1_STRING_FLAG_BITS_LEFT
;
423 if (!ASN1_BIT_STRING_set(curve
->seed
, group
->seed
,
424 (int)group
->seed_len
)) {
425 ECerr(EC_F_EC_ASN1_GROUP2CURVE
, ERR_R_ASN1_LIB
);
429 ASN1_BIT_STRING_free(curve
->seed
);
443 ECPARAMETERS
*EC_GROUP_get_ecparameters(const EC_GROUP
*group
,
444 ECPARAMETERS
*params
)
447 ECPARAMETERS
*ret
= NULL
;
449 unsigned char *buffer
= NULL
;
450 const EC_POINT
*point
= NULL
;
451 point_conversion_form_t form
;
454 if (params
== NULL
) {
455 if ((ret
= ECPARAMETERS_new()) == NULL
) {
456 ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS
, ERR_R_MALLOC_FAILURE
);
462 /* set the version (always one) */
463 ret
->version
= (long)0x1;
465 /* set the fieldID */
466 if (!ec_asn1_group2fieldid(group
, ret
->fieldID
)) {
467 ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS
, ERR_R_EC_LIB
);
472 if (!ec_asn1_group2curve(group
, ret
->curve
)) {
473 ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS
, ERR_R_EC_LIB
);
477 /* set the base point */
478 if ((point
= EC_GROUP_get0_generator(group
)) == NULL
) {
479 ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS
, EC_R_UNDEFINED_GENERATOR
);
483 form
= EC_GROUP_get_point_conversion_form(group
);
485 len
= EC_POINT_point2buf(group
, point
, form
, &buffer
, NULL
);
487 ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS
, ERR_R_EC_LIB
);
490 if (ret
->base
== NULL
&& (ret
->base
= ASN1_OCTET_STRING_new()) == NULL
) {
491 OPENSSL_free(buffer
);
492 ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS
, ERR_R_MALLOC_FAILURE
);
495 ASN1_STRING_set0(ret
->base
, buffer
, len
);
498 tmp
= EC_GROUP_get0_order(group
);
500 ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS
, ERR_R_EC_LIB
);
503 ret
->order
= BN_to_ASN1_INTEGER(tmp
, orig
= ret
->order
);
504 if (ret
->order
== NULL
) {
506 ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS
, ERR_R_ASN1_LIB
);
510 /* set the cofactor (optional) */
511 tmp
= EC_GROUP_get0_cofactor(group
);
513 ret
->cofactor
= BN_to_ASN1_INTEGER(tmp
, orig
= ret
->cofactor
);
514 if (ret
->cofactor
== NULL
) {
515 ret
->cofactor
= orig
;
516 ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS
, ERR_R_ASN1_LIB
);
525 ECPARAMETERS_free(ret
);
529 ECPKPARAMETERS
*EC_GROUP_get_ecpkparameters(const EC_GROUP
*group
,
530 ECPKPARAMETERS
*params
)
533 ECPKPARAMETERS
*ret
= params
;
536 if ((ret
= ECPKPARAMETERS_new()) == NULL
) {
537 ECerr(EC_F_EC_GROUP_GET_ECPKPARAMETERS
, ERR_R_MALLOC_FAILURE
);
542 ASN1_OBJECT_free(ret
->value
.named_curve
);
543 else if (ret
->type
== 1 && ret
->value
.parameters
)
544 ECPARAMETERS_free(ret
->value
.parameters
);
547 if (EC_GROUP_get_asn1_flag(group
)) {
549 * use the asn1 OID to describe the elliptic curve parameters
551 tmp
= EC_GROUP_get_curve_name(group
);
554 if ((ret
->value
.named_curve
= OBJ_nid2obj(tmp
)) == NULL
)
557 /* we don't know the nid => ERROR */
560 /* use the ECPARAMETERS structure */
562 if ((ret
->value
.parameters
=
563 EC_GROUP_get_ecparameters(group
, NULL
)) == NULL
)
568 ECPKPARAMETERS_free(ret
);
574 EC_GROUP
*EC_GROUP_new_from_ecparameters(const ECPARAMETERS
*params
)
577 EC_GROUP
*ret
= NULL
, *dup
= NULL
;
578 BIGNUM
*p
= NULL
, *a
= NULL
, *b
= NULL
;
579 EC_POINT
*point
= NULL
;
581 int curve_name
= NID_undef
;
584 if (!params
->fieldID
|| !params
->fieldID
->fieldType
||
585 !params
->fieldID
->p
.ptr
) {
586 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS
, EC_R_ASN1_ERROR
);
591 * Now extract the curve parameters a and b. Note that, although SEC 1
592 * specifies the length of their encodings, historical versions of OpenSSL
593 * encoded them incorrectly, so we must accept any length for backwards
596 if (!params
->curve
|| !params
->curve
->a
||
597 !params
->curve
->a
->data
|| !params
->curve
->b
||
598 !params
->curve
->b
->data
) {
599 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS
, EC_R_ASN1_ERROR
);
602 a
= BN_bin2bn(params
->curve
->a
->data
, params
->curve
->a
->length
, NULL
);
604 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS
, ERR_R_BN_LIB
);
607 b
= BN_bin2bn(params
->curve
->b
->data
, params
->curve
->b
->length
, NULL
);
609 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS
, ERR_R_BN_LIB
);
613 /* get the field parameters */
614 tmp
= OBJ_obj2nid(params
->fieldID
->fieldType
);
615 if (tmp
== NID_X9_62_characteristic_two_field
)
616 #ifdef OPENSSL_NO_EC2M
618 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS
, EC_R_GF2M_NOT_SUPPORTED
);
623 X9_62_CHARACTERISTIC_TWO
*char_two
;
625 char_two
= params
->fieldID
->p
.char_two
;
627 field_bits
= char_two
->m
;
628 if (field_bits
> OPENSSL_ECC_MAX_FIELD_BITS
) {
629 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS
, EC_R_FIELD_TOO_LARGE
);
633 if ((p
= BN_new()) == NULL
) {
634 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS
, ERR_R_MALLOC_FAILURE
);
638 /* get the base type */
639 tmp
= OBJ_obj2nid(char_two
->type
);
641 if (tmp
== NID_X9_62_tpBasis
) {
644 if (!char_two
->p
.tpBasis
) {
645 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS
, EC_R_ASN1_ERROR
);
649 tmp_long
= ASN1_INTEGER_get(char_two
->p
.tpBasis
);
651 if (!(char_two
->m
> tmp_long
&& tmp_long
> 0)) {
652 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS
,
653 EC_R_INVALID_TRINOMIAL_BASIS
);
657 /* create the polynomial */
658 if (!BN_set_bit(p
, (int)char_two
->m
))
660 if (!BN_set_bit(p
, (int)tmp_long
))
662 if (!BN_set_bit(p
, 0))
664 } else if (tmp
== NID_X9_62_ppBasis
) {
665 X9_62_PENTANOMIAL
*penta
;
667 penta
= char_two
->p
.ppBasis
;
669 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS
, EC_R_ASN1_ERROR
);
674 (char_two
->m
> penta
->k3
&& penta
->k3
> penta
->k2
675 && penta
->k2
> penta
->k1
&& penta
->k1
> 0)) {
676 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS
,
677 EC_R_INVALID_PENTANOMIAL_BASIS
);
681 /* create the polynomial */
682 if (!BN_set_bit(p
, (int)char_two
->m
))
684 if (!BN_set_bit(p
, (int)penta
->k1
))
686 if (!BN_set_bit(p
, (int)penta
->k2
))
688 if (!BN_set_bit(p
, (int)penta
->k3
))
690 if (!BN_set_bit(p
, 0))
692 } else if (tmp
== NID_X9_62_onBasis
) {
693 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS
, EC_R_NOT_IMPLEMENTED
);
697 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS
, EC_R_ASN1_ERROR
);
701 /* create the EC_GROUP structure */
702 ret
= EC_GROUP_new_curve_GF2m(p
, a
, b
, NULL
);
705 else if (tmp
== NID_X9_62_prime_field
) {
706 /* we have a curve over a prime field */
707 /* extract the prime number */
708 if (!params
->fieldID
->p
.prime
) {
709 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS
, EC_R_ASN1_ERROR
);
712 p
= ASN1_INTEGER_to_BN(params
->fieldID
->p
.prime
, NULL
);
714 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS
, ERR_R_ASN1_LIB
);
718 if (BN_is_negative(p
) || BN_is_zero(p
)) {
719 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS
, EC_R_INVALID_FIELD
);
723 field_bits
= BN_num_bits(p
);
724 if (field_bits
> OPENSSL_ECC_MAX_FIELD_BITS
) {
725 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS
, EC_R_FIELD_TOO_LARGE
);
729 /* create the EC_GROUP structure */
730 ret
= EC_GROUP_new_curve_GFp(p
, a
, b
, NULL
);
732 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS
, EC_R_INVALID_FIELD
);
737 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS
, ERR_R_EC_LIB
);
741 /* extract seed (optional) */
742 if (params
->curve
->seed
!= NULL
) {
743 OPENSSL_free(ret
->seed
);
744 if ((ret
->seed
= OPENSSL_malloc(params
->curve
->seed
->length
)) == NULL
) {
745 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS
, ERR_R_MALLOC_FAILURE
);
748 memcpy(ret
->seed
, params
->curve
->seed
->data
,
749 params
->curve
->seed
->length
);
750 ret
->seed_len
= params
->curve
->seed
->length
;
753 if (!params
->order
|| !params
->base
|| !params
->base
->data
) {
754 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS
, EC_R_ASN1_ERROR
);
758 if ((point
= EC_POINT_new(ret
)) == NULL
)
761 /* set the point conversion form */
762 EC_GROUP_set_point_conversion_form(ret
, (point_conversion_form_t
)
763 (params
->base
->data
[0] & ~0x01));
765 /* extract the ec point */
766 if (!EC_POINT_oct2point(ret
, point
, params
->base
->data
,
767 params
->base
->length
, NULL
)) {
768 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS
, ERR_R_EC_LIB
);
772 /* extract the order */
773 if ((a
= ASN1_INTEGER_to_BN(params
->order
, a
)) == NULL
) {
774 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS
, ERR_R_ASN1_LIB
);
777 if (BN_is_negative(a
) || BN_is_zero(a
)) {
778 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS
, EC_R_INVALID_GROUP_ORDER
);
781 if (BN_num_bits(a
) > (int)field_bits
+ 1) { /* Hasse bound */
782 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS
, EC_R_INVALID_GROUP_ORDER
);
786 /* extract the cofactor (optional) */
787 if (params
->cofactor
== NULL
) {
790 } else if ((b
= ASN1_INTEGER_to_BN(params
->cofactor
, b
)) == NULL
) {
791 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS
, ERR_R_ASN1_LIB
);
794 /* set the generator, order and cofactor (if present) */
795 if (!EC_GROUP_set_generator(ret
, point
, a
, b
)) {
796 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS
, ERR_R_EC_LIB
);
801 * Check if the explicit parameters group just created matches one of the
804 * We create a copy of the group just built, so that we can remove optional
805 * fields for the lookup: we do this to avoid the possibility that one of
806 * the optional parameters is used to force the library into using a less
807 * performant and less secure EC_METHOD instead of the specialized one.
808 * In any case, `seed` is not really used in any computation, while a
809 * cofactor different from the one in the built-in table is just
810 * mathematically wrong anyway and should not be used.
812 if ((ctx
= BN_CTX_new()) == NULL
) {
813 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS
, ERR_R_BN_LIB
);
816 if ((dup
= EC_GROUP_dup(ret
)) == NULL
817 || EC_GROUP_set_seed(dup
, NULL
, 0) != 1
818 || !EC_GROUP_set_generator(dup
, point
, a
, NULL
)) {
819 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS
, ERR_R_EC_LIB
);
822 if ((curve_name
= ec_curve_nid_from_params(dup
, ctx
)) != NID_undef
) {
824 * The input explicit parameters successfully matched one of the
825 * built-in curves: often for built-in curves we have specialized
826 * methods with better performance and hardening.
828 * In this case we replace the `EC_GROUP` created through explicit
829 * parameters with one created from a named group.
831 EC_GROUP
*named_group
= NULL
;
833 #ifndef OPENSSL_NO_EC_NISTP_64_GCC_128
835 * NID_wap_wsg_idm_ecid_wtls12 and NID_secp224r1 are both aliases for
836 * the same curve, we prefer the SECP nid when matching explicit
837 * parameters as that is associated with a specialized EC_METHOD.
839 if (curve_name
== NID_wap_wsg_idm_ecid_wtls12
)
840 curve_name
= NID_secp224r1
;
841 #endif /* !def(OPENSSL_NO_EC_NISTP_64_GCC_128) */
843 if ((named_group
= EC_GROUP_new_by_curve_name(curve_name
)) == NULL
) {
844 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS
, ERR_R_EC_LIB
);
851 * Set the flag so that EC_GROUPs created from explicit parameters are
852 * serialized using explicit parameters by default.
854 EC_GROUP_set_asn1_flag(ret
, OPENSSL_EC_EXPLICIT_CURVE
);
869 EC_POINT_free(point
);
876 EC_GROUP
*EC_GROUP_new_from_ecpkparameters(const ECPKPARAMETERS
*params
)
878 EC_GROUP
*ret
= NULL
;
881 if (params
== NULL
) {
882 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPKPARAMETERS
, EC_R_MISSING_PARAMETERS
);
886 if (params
->type
== 0) { /* the curve is given by an OID */
887 tmp
= OBJ_obj2nid(params
->value
.named_curve
);
888 if ((ret
= EC_GROUP_new_by_curve_name(tmp
)) == NULL
) {
889 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPKPARAMETERS
,
890 EC_R_EC_GROUP_NEW_BY_NAME_FAILURE
);
893 EC_GROUP_set_asn1_flag(ret
, OPENSSL_EC_NAMED_CURVE
);
894 } else if (params
->type
== 1) { /* the parameters are given by a
895 * ECPARAMETERS structure */
896 ret
= EC_GROUP_new_from_ecparameters(params
->value
.parameters
);
898 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPKPARAMETERS
, ERR_R_EC_LIB
);
901 EC_GROUP_set_asn1_flag(ret
, OPENSSL_EC_EXPLICIT_CURVE
);
902 } else if (params
->type
== 2) { /* implicitlyCA */
905 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPKPARAMETERS
, EC_R_ASN1_ERROR
);
912 /* EC_GROUP <-> DER encoding of ECPKPARAMETERS */
914 EC_GROUP
*d2i_ECPKParameters(EC_GROUP
**a
, const unsigned char **in
, long len
)
916 EC_GROUP
*group
= NULL
;
917 ECPKPARAMETERS
*params
= NULL
;
918 const unsigned char *p
= *in
;
920 if ((params
= d2i_ECPKPARAMETERS(NULL
, &p
, len
)) == NULL
) {
921 ECerr(EC_F_D2I_ECPKPARAMETERS
, EC_R_D2I_ECPKPARAMETERS_FAILURE
);
922 ECPKPARAMETERS_free(params
);
926 if ((group
= EC_GROUP_new_from_ecpkparameters(params
)) == NULL
) {
927 ECerr(EC_F_D2I_ECPKPARAMETERS
, EC_R_PKPARAMETERS2GROUP_FAILURE
);
928 ECPKPARAMETERS_free(params
);
937 ECPKPARAMETERS_free(params
);
942 int i2d_ECPKParameters(const EC_GROUP
*a
, unsigned char **out
)
945 ECPKPARAMETERS
*tmp
= EC_GROUP_get_ecpkparameters(a
, NULL
);
947 ECerr(EC_F_I2D_ECPKPARAMETERS
, EC_R_GROUP2PKPARAMETERS_FAILURE
);
950 if ((ret
= i2d_ECPKPARAMETERS(tmp
, out
)) == 0) {
951 ECerr(EC_F_I2D_ECPKPARAMETERS
, EC_R_I2D_ECPKPARAMETERS_FAILURE
);
952 ECPKPARAMETERS_free(tmp
);
955 ECPKPARAMETERS_free(tmp
);
959 /* some EC_KEY functions */
961 EC_KEY
*d2i_ECPrivateKey(EC_KEY
**a
, const unsigned char **in
, long len
)
964 EC_PRIVATEKEY
*priv_key
= NULL
;
965 const unsigned char *p
= *in
;
967 if ((priv_key
= d2i_EC_PRIVATEKEY(NULL
, &p
, len
)) == NULL
) {
968 ECerr(EC_F_D2I_ECPRIVATEKEY
, ERR_R_EC_LIB
);
972 if (a
== NULL
|| *a
== NULL
) {
973 if ((ret
= EC_KEY_new()) == NULL
) {
974 ECerr(EC_F_D2I_ECPRIVATEKEY
, ERR_R_MALLOC_FAILURE
);
980 if (priv_key
->parameters
) {
981 EC_GROUP_free(ret
->group
);
982 ret
->group
= EC_GROUP_new_from_ecpkparameters(priv_key
->parameters
);
985 if (ret
->group
== NULL
) {
986 ECerr(EC_F_D2I_ECPRIVATEKEY
, ERR_R_EC_LIB
);
990 ret
->version
= priv_key
->version
;
992 if (priv_key
->privateKey
) {
993 ASN1_OCTET_STRING
*pkey
= priv_key
->privateKey
;
994 if (EC_KEY_oct2priv(ret
, ASN1_STRING_get0_data(pkey
),
995 ASN1_STRING_length(pkey
)) == 0)
998 ECerr(EC_F_D2I_ECPRIVATEKEY
, EC_R_MISSING_PRIVATE_KEY
);
1002 EC_POINT_clear_free(ret
->pub_key
);
1003 ret
->pub_key
= EC_POINT_new(ret
->group
);
1004 if (ret
->pub_key
== NULL
) {
1005 ECerr(EC_F_D2I_ECPRIVATEKEY
, ERR_R_EC_LIB
);
1009 if (priv_key
->publicKey
) {
1010 const unsigned char *pub_oct
;
1013 pub_oct
= ASN1_STRING_get0_data(priv_key
->publicKey
);
1014 pub_oct_len
= ASN1_STRING_length(priv_key
->publicKey
);
1015 if (!EC_KEY_oct2key(ret
, pub_oct
, pub_oct_len
, NULL
)) {
1016 ECerr(EC_F_D2I_ECPRIVATEKEY
, ERR_R_EC_LIB
);
1020 if (ret
->group
->meth
->keygenpub
== NULL
1021 || ret
->group
->meth
->keygenpub(ret
) == 0)
1023 /* Remember the original private-key-only encoding. */
1024 ret
->enc_flag
|= EC_PKEY_NO_PUBKEY
;
1029 EC_PRIVATEKEY_free(priv_key
);
1034 if (a
== NULL
|| *a
!= ret
)
1036 EC_PRIVATEKEY_free(priv_key
);
1040 int i2d_ECPrivateKey(const EC_KEY
*a
, unsigned char **out
)
1042 int ret
= 0, ok
= 0;
1043 unsigned char *priv
= NULL
, *pub
= NULL
;
1044 size_t privlen
= 0, publen
= 0;
1046 EC_PRIVATEKEY
*priv_key
= NULL
;
1048 if (a
== NULL
|| a
->group
== NULL
||
1049 (!(a
->enc_flag
& EC_PKEY_NO_PUBKEY
) && a
->pub_key
== NULL
)) {
1050 ECerr(EC_F_I2D_ECPRIVATEKEY
, ERR_R_PASSED_NULL_PARAMETER
);
1054 if ((priv_key
= EC_PRIVATEKEY_new()) == NULL
) {
1055 ECerr(EC_F_I2D_ECPRIVATEKEY
, ERR_R_MALLOC_FAILURE
);
1059 priv_key
->version
= a
->version
;
1061 privlen
= EC_KEY_priv2buf(a
, &priv
);
1064 ECerr(EC_F_I2D_ECPRIVATEKEY
, ERR_R_EC_LIB
);
1068 ASN1_STRING_set0(priv_key
->privateKey
, priv
, privlen
);
1071 if (!(a
->enc_flag
& EC_PKEY_NO_PARAMETERS
)) {
1072 if ((priv_key
->parameters
=
1073 EC_GROUP_get_ecpkparameters(a
->group
,
1074 priv_key
->parameters
)) == NULL
) {
1075 ECerr(EC_F_I2D_ECPRIVATEKEY
, ERR_R_EC_LIB
);
1080 if (!(a
->enc_flag
& EC_PKEY_NO_PUBKEY
)) {
1081 priv_key
->publicKey
= ASN1_BIT_STRING_new();
1082 if (priv_key
->publicKey
== NULL
) {
1083 ECerr(EC_F_I2D_ECPRIVATEKEY
, ERR_R_MALLOC_FAILURE
);
1087 publen
= EC_KEY_key2buf(a
, a
->conv_form
, &pub
, NULL
);
1090 ECerr(EC_F_I2D_ECPRIVATEKEY
, ERR_R_EC_LIB
);
1094 priv_key
->publicKey
->flags
&= ~(ASN1_STRING_FLAG_BITS_LEFT
| 0x07);
1095 priv_key
->publicKey
->flags
|= ASN1_STRING_FLAG_BITS_LEFT
;
1096 ASN1_STRING_set0(priv_key
->publicKey
, pub
, publen
);
1100 if ((ret
= i2d_EC_PRIVATEKEY(priv_key
, out
)) == 0) {
1101 ECerr(EC_F_I2D_ECPRIVATEKEY
, ERR_R_EC_LIB
);
1106 OPENSSL_clear_free(priv
, privlen
);
1108 EC_PRIVATEKEY_free(priv_key
);
1109 return (ok
? ret
: 0);
1112 int i2d_ECParameters(const EC_KEY
*a
, unsigned char **out
)
1115 ECerr(EC_F_I2D_ECPARAMETERS
, ERR_R_PASSED_NULL_PARAMETER
);
1118 return i2d_ECPKParameters(a
->group
, out
);
1121 EC_KEY
*d2i_ECParameters(EC_KEY
**a
, const unsigned char **in
, long len
)
1125 if (in
== NULL
|| *in
== NULL
) {
1126 ECerr(EC_F_D2I_ECPARAMETERS
, ERR_R_PASSED_NULL_PARAMETER
);
1130 if (a
== NULL
|| *a
== NULL
) {
1131 if ((ret
= EC_KEY_new()) == NULL
) {
1132 ECerr(EC_F_D2I_ECPARAMETERS
, ERR_R_MALLOC_FAILURE
);
1138 if (!d2i_ECPKParameters(&ret
->group
, in
, len
)) {
1139 ECerr(EC_F_D2I_ECPARAMETERS
, ERR_R_EC_LIB
);
1140 if (a
== NULL
|| *a
!= ret
)
1151 EC_KEY
*o2i_ECPublicKey(EC_KEY
**a
, const unsigned char **in
, long len
)
1155 if (a
== NULL
|| (*a
) == NULL
|| (*a
)->group
== NULL
) {
1157 * sorry, but a EC_GROUP-structure is necessary to set the public key
1159 ECerr(EC_F_O2I_ECPUBLICKEY
, ERR_R_PASSED_NULL_PARAMETER
);
1163 if (!EC_KEY_oct2key(ret
, *in
, len
, NULL
)) {
1164 ECerr(EC_F_O2I_ECPUBLICKEY
, ERR_R_EC_LIB
);
1171 int i2o_ECPublicKey(const EC_KEY
*a
, unsigned char **out
)
1177 ECerr(EC_F_I2O_ECPUBLICKEY
, ERR_R_PASSED_NULL_PARAMETER
);
1181 buf_len
= EC_POINT_point2oct(a
->group
, a
->pub_key
,
1182 a
->conv_form
, NULL
, 0, NULL
);
1184 if (out
== NULL
|| buf_len
== 0)
1185 /* out == NULL => just return the length of the octet string */
1189 if ((*out
= OPENSSL_malloc(buf_len
)) == NULL
) {
1190 ECerr(EC_F_I2O_ECPUBLICKEY
, ERR_R_MALLOC_FAILURE
);
1195 if (!EC_POINT_point2oct(a
->group
, a
->pub_key
, a
->conv_form
,
1196 *out
, buf_len
, NULL
)) {
1197 ECerr(EC_F_I2O_ECPUBLICKEY
, ERR_R_EC_LIB
);
1209 DECLARE_ASN1_FUNCTIONS(ECDSA_SIG
)
1210 DECLARE_ASN1_ENCODE_FUNCTIONS_name(ECDSA_SIG
, ECDSA_SIG
)
1212 #endif /* FIPS_MODE */
1214 ECDSA_SIG
*ECDSA_SIG_new(void)
1216 ECDSA_SIG
*sig
= OPENSSL_zalloc(sizeof(*sig
));
1218 ECerr(EC_F_ECDSA_SIG_NEW
, ERR_R_MALLOC_FAILURE
);
1222 void ECDSA_SIG_free(ECDSA_SIG
*sig
)
1226 BN_clear_free(sig
->r
);
1227 BN_clear_free(sig
->s
);
1231 ECDSA_SIG
*d2i_ECDSA_SIG(ECDSA_SIG
**psig
, const unsigned char **ppin
, long len
)
1237 if (psig
!= NULL
&& *psig
!= NULL
) {
1240 sig
= ECDSA_SIG_new();
1248 if (decode_der_dsa_sig(sig
->r
, sig
->s
, ppin
, (size_t)len
) == 0) {
1249 if (psig
== NULL
|| *psig
== NULL
)
1250 ECDSA_SIG_free(sig
);
1253 if (psig
!= NULL
&& *psig
== NULL
)
1258 int i2d_ECDSA_SIG(const ECDSA_SIG
*sig
, unsigned char **ppout
)
1260 BUF_MEM
*buf
= NULL
;
1264 if (ppout
== NULL
) {
1265 if (!WPACKET_init_null(&pkt
, 0))
1267 } else if (*ppout
== NULL
) {
1268 if ((buf
= BUF_MEM_new()) == NULL
1269 || !WPACKET_init_len(&pkt
, buf
, 0)) {
1274 if (!WPACKET_init_static_len(&pkt
, *ppout
, SIZE_MAX
, 0))
1278 if (!encode_der_dsa_sig(&pkt
, sig
->r
, sig
->s
)
1279 || !WPACKET_get_total_written(&pkt
, &encoded_len
)
1280 || !WPACKET_finish(&pkt
)) {
1282 WPACKET_cleanup(&pkt
);
1286 if (ppout
!= NULL
) {
1287 if (*ppout
== NULL
) {
1288 *ppout
= (unsigned char *)buf
->data
;
1292 *ppout
+= encoded_len
;
1296 return (int)encoded_len
;
1299 void ECDSA_SIG_get0(const ECDSA_SIG
*sig
, const BIGNUM
**pr
, const BIGNUM
**ps
)
1307 const BIGNUM
*ECDSA_SIG_get0_r(const ECDSA_SIG
*sig
)
1312 const BIGNUM
*ECDSA_SIG_get0_s(const ECDSA_SIG
*sig
)
1317 int ECDSA_SIG_set0(ECDSA_SIG
*sig
, BIGNUM
*r
, BIGNUM
*s
)
1319 if (r
== NULL
|| s
== NULL
)
1321 BN_clear_free(sig
->r
);
1322 BN_clear_free(sig
->s
);
1329 int ECDSA_size(const EC_KEY
*r
)
1333 unsigned char buf
[4];
1334 const EC_GROUP
*group
;
1338 group
= EC_KEY_get0_group(r
);
1342 i
= EC_GROUP_order_bits(group
);
1345 bs
.length
= (i
+ 7) / 8;
1347 bs
.type
= V_ASN1_INTEGER
;
1348 /* If the top bit is set the asn1 encoding is 1 larger. */
1351 i
= i2d_ASN1_INTEGER(&bs
, NULL
);
1352 i
+= i
; /* r and s */
1353 ret
= ASN1_object_size(1, i
, V_ASN1_SEQUENCE
);