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openssl/crypto/ec/ec_asn1.c
Douglas E Engert 3d5bb773ec Ensure EC private keys retain leading zeros 
RFC5915 requires the use of the I2OSP primitive as defined in RFC3447
for storing an EC Private Key. This converts the private key into an
OCTETSTRING and retains any leading zeros. This commit ensures that those
leading zeros are present if required.

Reviewed-by: Andy Polyakov <appro@openssl.org>
(cherry picked from commit 30cd4ff294)

Conflicts:
	crypto/ec/ec_asn1.c
2015-03-31 16:38:20 +01:00

1322 lines
40 KiB
C
Raw Blame History

/* crypto/ec/ec_asn1.c */
/*
* Written by Nils Larsch for the OpenSSL project.
*/
/* ====================================================================
* Copyright (c) 2000-2003 The OpenSSL Project. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. All advertising materials mentioning features or use of this
* software must display the following acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
*
* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
* endorse or promote products derived from this software without
* prior written permission. For written permission, please contact
* licensing@OpenSSL.org.
*
* 5. Products derived from this software may not be called "OpenSSL"
* nor may "OpenSSL" appear in their names without prior written
* permission of the OpenSSL Project.
*
* 6. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
*
* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
* ====================================================================
*
* This product includes cryptographic software written by Eric Young
* (eay@cryptsoft.com). This product includes software written by Tim
* Hudson (tjh@cryptsoft.com).
*
*/
#include <string.h>
#include "ec_lcl.h"
#include <openssl/err.h>
#include <openssl/asn1t.h>
#include <openssl/objects.h>
int EC_GROUP_get_basis_type(const EC_GROUP *group)
{
int i = 0;
if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
NID_X9_62_characteristic_two_field)
/* everything else is currently not supported */
return 0;
while (group->poly[i] != 0)
i++;
if (i == 4)
return NID_X9_62_ppBasis;
else if (i == 2)
return NID_X9_62_tpBasis;
else
/* everything else is currently not supported */
return 0;
}
#ifndef OPENSSL_NO_EC2M
int EC_GROUP_get_trinomial_basis(const EC_GROUP *group, unsigned int *k)
{
if (group == NULL)
return 0;
if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
NID_X9_62_characteristic_two_field
|| !((group->poly[0] != 0) && (group->poly[1] != 0)
&& (group->poly[2] == 0))) {
ECerr(EC_F_EC_GROUP_GET_TRINOMIAL_BASIS,
ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
return 0;
}
if (k)
*k = group->poly[1];
return 1;
}
int EC_GROUP_get_pentanomial_basis(const EC_GROUP *group, unsigned int *k1,
unsigned int *k2, unsigned int *k3)
{
if (group == NULL)
return 0;
if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
NID_X9_62_characteristic_two_field
|| !((group->poly[0] != 0) && (group->poly[1] != 0)
&& (group->poly[2] != 0) && (group->poly[3] != 0)
&& (group->poly[4] == 0))) {
ECerr(EC_F_EC_GROUP_GET_PENTANOMIAL_BASIS,
ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
return 0;
}
if (k1)
*k1 = group->poly[3];
if (k2)
*k2 = group->poly[2];
if (k3)
*k3 = group->poly[1];
return 1;
}
#endif
/* some structures needed for the asn1 encoding */
typedef struct x9_62_pentanomial_st {
long k1;
long k2;
long k3;
} X9_62_PENTANOMIAL;
typedef struct x9_62_characteristic_two_st {
long m;
ASN1_OBJECT *type;
union {
char *ptr;
/* NID_X9_62_onBasis */
ASN1_NULL *onBasis;
/* NID_X9_62_tpBasis */
ASN1_INTEGER *tpBasis;
/* NID_X9_62_ppBasis */
X9_62_PENTANOMIAL *ppBasis;
/* anything else */
ASN1_TYPE *other;
} p;
} X9_62_CHARACTERISTIC_TWO;
typedef struct x9_62_fieldid_st {
ASN1_OBJECT *fieldType;
union {
char *ptr;
/* NID_X9_62_prime_field */
ASN1_INTEGER *prime;
/* NID_X9_62_characteristic_two_field */
X9_62_CHARACTERISTIC_TWO *char_two;
/* anything else */
ASN1_TYPE *other;
} p;
} X9_62_FIELDID;
typedef struct x9_62_curve_st {
ASN1_OCTET_STRING *a;
ASN1_OCTET_STRING *b;
ASN1_BIT_STRING *seed;
} X9_62_CURVE;
typedef struct ec_parameters_st {
long version;
X9_62_FIELDID *fieldID;
X9_62_CURVE *curve;
ASN1_OCTET_STRING *base;
ASN1_INTEGER *order;
ASN1_INTEGER *cofactor;
} ECPARAMETERS;
struct ecpk_parameters_st {
int type;
union {
ASN1_OBJECT *named_curve;
ECPARAMETERS *parameters;
ASN1_NULL *implicitlyCA;
} value;
} /* ECPKPARAMETERS */ ;
/* SEC1 ECPrivateKey */
typedef struct ec_privatekey_st {
long version;
ASN1_OCTET_STRING *privateKey;
ECPKPARAMETERS *parameters;
ASN1_BIT_STRING *publicKey;
} EC_PRIVATEKEY;
/* the OpenSSL ASN.1 definitions */
ASN1_SEQUENCE(X9_62_PENTANOMIAL) = {
ASN1_SIMPLE(X9_62_PENTANOMIAL, k1, LONG),
ASN1_SIMPLE(X9_62_PENTANOMIAL, k2, LONG),
ASN1_SIMPLE(X9_62_PENTANOMIAL, k3, LONG)
} ASN1_SEQUENCE_END(X9_62_PENTANOMIAL)
DECLARE_ASN1_ALLOC_FUNCTIONS(X9_62_PENTANOMIAL)
IMPLEMENT_ASN1_ALLOC_FUNCTIONS(X9_62_PENTANOMIAL)
ASN1_ADB_TEMPLATE(char_two_def) = ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, p.other, ASN1_ANY);
ASN1_ADB(X9_62_CHARACTERISTIC_TWO) = {
ADB_ENTRY(NID_X9_62_onBasis, ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, p.onBasis, ASN1_NULL)),
ADB_ENTRY(NID_X9_62_tpBasis, ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, p.tpBasis, ASN1_INTEGER)),
ADB_ENTRY(NID_X9_62_ppBasis, ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, p.ppBasis, X9_62_PENTANOMIAL))
} ASN1_ADB_END(X9_62_CHARACTERISTIC_TWO, 0, type, 0, &char_two_def_tt, NULL);
ASN1_SEQUENCE(X9_62_CHARACTERISTIC_TWO) = {
ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, m, LONG),
ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, type, ASN1_OBJECT),
ASN1_ADB_OBJECT(X9_62_CHARACTERISTIC_TWO)
} ASN1_SEQUENCE_END(X9_62_CHARACTERISTIC_TWO)
DECLARE_ASN1_ALLOC_FUNCTIONS(X9_62_CHARACTERISTIC_TWO)
IMPLEMENT_ASN1_ALLOC_FUNCTIONS(X9_62_CHARACTERISTIC_TWO)
ASN1_ADB_TEMPLATE(fieldID_def) = ASN1_SIMPLE(X9_62_FIELDID, p.other, ASN1_ANY);
ASN1_ADB(X9_62_FIELDID) = {
ADB_ENTRY(NID_X9_62_prime_field, ASN1_SIMPLE(X9_62_FIELDID, p.prime, ASN1_INTEGER)),
ADB_ENTRY(NID_X9_62_characteristic_two_field, ASN1_SIMPLE(X9_62_FIELDID, p.char_two, X9_62_CHARACTERISTIC_TWO))
} ASN1_ADB_END(X9_62_FIELDID, 0, fieldType, 0, &fieldID_def_tt, NULL);
ASN1_SEQUENCE(X9_62_FIELDID) = {
ASN1_SIMPLE(X9_62_FIELDID, fieldType, ASN1_OBJECT),
ASN1_ADB_OBJECT(X9_62_FIELDID)
} ASN1_SEQUENCE_END(X9_62_FIELDID)
ASN1_SEQUENCE(X9_62_CURVE) = {
ASN1_SIMPLE(X9_62_CURVE, a, ASN1_OCTET_STRING),
ASN1_SIMPLE(X9_62_CURVE, b, ASN1_OCTET_STRING),
ASN1_OPT(X9_62_CURVE, seed, ASN1_BIT_STRING)
} ASN1_SEQUENCE_END(X9_62_CURVE)
ASN1_SEQUENCE(ECPARAMETERS) = {
ASN1_SIMPLE(ECPARAMETERS, version, LONG),
ASN1_SIMPLE(ECPARAMETERS, fieldID, X9_62_FIELDID),
ASN1_SIMPLE(ECPARAMETERS, curve, X9_62_CURVE),
ASN1_SIMPLE(ECPARAMETERS, base, ASN1_OCTET_STRING),
ASN1_SIMPLE(ECPARAMETERS, order, ASN1_INTEGER),
ASN1_OPT(ECPARAMETERS, cofactor, ASN1_INTEGER)
} ASN1_SEQUENCE_END(ECPARAMETERS)
DECLARE_ASN1_ALLOC_FUNCTIONS(ECPARAMETERS)
IMPLEMENT_ASN1_ALLOC_FUNCTIONS(ECPARAMETERS)
ASN1_CHOICE(ECPKPARAMETERS) = {
ASN1_SIMPLE(ECPKPARAMETERS, value.named_curve, ASN1_OBJECT),
ASN1_SIMPLE(ECPKPARAMETERS, value.parameters, ECPARAMETERS),
ASN1_SIMPLE(ECPKPARAMETERS, value.implicitlyCA, ASN1_NULL)
} ASN1_CHOICE_END(ECPKPARAMETERS)
DECLARE_ASN1_FUNCTIONS_const(ECPKPARAMETERS)
DECLARE_ASN1_ENCODE_FUNCTIONS_const(ECPKPARAMETERS, ECPKPARAMETERS)
IMPLEMENT_ASN1_FUNCTIONS_const(ECPKPARAMETERS)
ASN1_SEQUENCE(EC_PRIVATEKEY) = {
ASN1_SIMPLE(EC_PRIVATEKEY, version, LONG),
ASN1_SIMPLE(EC_PRIVATEKEY, privateKey, ASN1_OCTET_STRING),
ASN1_EXP_OPT(EC_PRIVATEKEY, parameters, ECPKPARAMETERS, 0),
ASN1_EXP_OPT(EC_PRIVATEKEY, publicKey, ASN1_BIT_STRING, 1)
} ASN1_SEQUENCE_END(EC_PRIVATEKEY)
DECLARE_ASN1_FUNCTIONS_const(EC_PRIVATEKEY)
DECLARE_ASN1_ENCODE_FUNCTIONS_const(EC_PRIVATEKEY, EC_PRIVATEKEY)
IMPLEMENT_ASN1_FUNCTIONS_const(EC_PRIVATEKEY)
/* some declarations of internal function */
/* ec_asn1_group2field() sets the values in a X9_62_FIELDID object */
static int ec_asn1_group2fieldid(const EC_GROUP *, X9_62_FIELDID *);
/* ec_asn1_group2curve() sets the values in a X9_62_CURVE object */
static int ec_asn1_group2curve(const EC_GROUP *, X9_62_CURVE *);
/*
* ec_asn1_parameters2group() creates a EC_GROUP object from a ECPARAMETERS
* object
*/
static EC_GROUP *ec_asn1_parameters2group(const ECPARAMETERS *);
/*
* ec_asn1_group2parameters() creates a ECPARAMETERS object from a EC_GROUP
* object
*/
static ECPARAMETERS *ec_asn1_group2parameters(const EC_GROUP *,
ECPARAMETERS *);
/*
* ec_asn1_pkparameters2group() creates a EC_GROUP object from a
* ECPKPARAMETERS object
*/
static EC_GROUP *ec_asn1_pkparameters2group(const ECPKPARAMETERS *);
/*
* ec_asn1_group2pkparameters() creates a ECPKPARAMETERS object from a
* EC_GROUP object
*/
static ECPKPARAMETERS *ec_asn1_group2pkparameters(const EC_GROUP *,
ECPKPARAMETERS *);
/* the function definitions */
static int ec_asn1_group2fieldid(const EC_GROUP *group, X9_62_FIELDID *field)
{
int ok = 0, nid;
BIGNUM *tmp = NULL;
if (group == NULL || field == NULL)
return 0;
/* clear the old values (if necessary) */
if (field->fieldType != NULL)
ASN1_OBJECT_free(field->fieldType);
if (field->p.other != NULL)
ASN1_TYPE_free(field->p.other);
nid = EC_METHOD_get_field_type(EC_GROUP_method_of(group));
/* set OID for the field */
if ((field->fieldType = OBJ_nid2obj(nid)) == NULL) {
ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_OBJ_LIB);
goto err;
}
if (nid == NID_X9_62_prime_field) {
if ((tmp = BN_new()) == NULL) {
ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE);
goto err;
}
/* the parameters are specified by the prime number p */
if (!EC_GROUP_get_curve_GFp(group, tmp, NULL, NULL, NULL)) {
ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_EC_LIB);
goto err;
}
/* set the prime number */
field->p.prime = BN_to_ASN1_INTEGER(tmp, NULL);
if (field->p.prime == NULL) {
ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_ASN1_LIB);
goto err;
}
} else /* nid == NID_X9_62_characteristic_two_field */
#ifdef OPENSSL_NO_EC2M
{
ECerr(EC_F_EC_ASN1_GROUP2FIELDID, EC_R_GF2M_NOT_SUPPORTED);
goto err;
}
#else
{
int field_type;
X9_62_CHARACTERISTIC_TWO *char_two;
field->p.char_two = X9_62_CHARACTERISTIC_TWO_new();
char_two = field->p.char_two;
if (char_two == NULL) {
ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE);
goto err;
}
char_two->m = (long)EC_GROUP_get_degree(group);
field_type = EC_GROUP_get_basis_type(group);
if (field_type == 0) {
ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_EC_LIB);
goto err;
}
/* set base type OID */
if ((char_two->type = OBJ_nid2obj(field_type)) == NULL) {
ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_OBJ_LIB);
goto err;
}
if (field_type == NID_X9_62_tpBasis) {
unsigned int k;
if (!EC_GROUP_get_trinomial_basis(group, &k))
goto err;
char_two->p.tpBasis = ASN1_INTEGER_new();
if (!char_two->p.tpBasis) {
ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE);
goto err;
}
if (!ASN1_INTEGER_set(char_two->p.tpBasis, (long)k)) {
ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_ASN1_LIB);
goto err;
}
} else if (field_type == NID_X9_62_ppBasis) {
unsigned int k1, k2, k3;
if (!EC_GROUP_get_pentanomial_basis(group, &k1, &k2, &k3))
goto err;
char_two->p.ppBasis = X9_62_PENTANOMIAL_new();
if (!char_two->p.ppBasis) {
ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE);
goto err;
}
/* set k? values */
char_two->p.ppBasis->k1 = (long)k1;
char_two->p.ppBasis->k2 = (long)k2;
char_two->p.ppBasis->k3 = (long)k3;
} else { /* field_type == NID_X9_62_onBasis */
/* for ONB the parameters are (asn1) NULL */
char_two->p.onBasis = ASN1_NULL_new();
if (!char_two->p.onBasis) {
ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE);
goto err;
}
}
}
#endif
ok = 1;
err:if (tmp)
BN_free(tmp);
return (ok);
}
static int ec_asn1_group2curve(const EC_GROUP *group, X9_62_CURVE *curve)
{
int ok = 0, nid;
BIGNUM *tmp_1 = NULL, *tmp_2 = NULL;
unsigned char *buffer_1 = NULL, *buffer_2 = NULL,
*a_buf = NULL, *b_buf = NULL;
size_t len_1, len_2;
unsigned char char_zero = 0;
if (!group || !curve || !curve->a || !curve->b)
return 0;
if ((tmp_1 = BN_new()) == NULL || (tmp_2 = BN_new()) == NULL) {
ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_MALLOC_FAILURE);
goto err;
}
nid = EC_METHOD_get_field_type(EC_GROUP_method_of(group));
/* get a and b */
if (nid == NID_X9_62_prime_field) {
if (!EC_GROUP_get_curve_GFp(group, NULL, tmp_1, tmp_2, NULL)) {
ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_EC_LIB);
goto err;
}
}
#ifndef OPENSSL_NO_EC2M
else { /* nid == NID_X9_62_characteristic_two_field */
if (!EC_GROUP_get_curve_GF2m(group, NULL, tmp_1, tmp_2, NULL)) {
ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_EC_LIB);
goto err;
}
}
#endif
len_1 = (size_t)BN_num_bytes(tmp_1);
len_2 = (size_t)BN_num_bytes(tmp_2);
if (len_1 == 0) {
/* len_1 == 0 => a == 0 */
a_buf = &char_zero;
len_1 = 1;
} else {
if ((buffer_1 = OPENSSL_malloc(len_1)) == NULL) {
ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_MALLOC_FAILURE);
goto err;
}
if ((len_1 = BN_bn2bin(tmp_1, buffer_1)) == 0) {
ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_BN_LIB);
goto err;
}
a_buf = buffer_1;
}
if (len_2 == 0) {
/* len_2 == 0 => b == 0 */
b_buf = &char_zero;
len_2 = 1;
} else {
if ((buffer_2 = OPENSSL_malloc(len_2)) == NULL) {
ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_MALLOC_FAILURE);
goto err;
}
if ((len_2 = BN_bn2bin(tmp_2, buffer_2)) == 0) {
ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_BN_LIB);
goto err;
}
b_buf = buffer_2;
}
/* set a and b */
if (!M_ASN1_OCTET_STRING_set(curve->a, a_buf, len_1) ||
!M_ASN1_OCTET_STRING_set(curve->b, b_buf, len_2)) {
ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_ASN1_LIB);
goto err;
}
/* set the seed (optional) */
if (group->seed) {
if (!curve->seed)
if ((curve->seed = ASN1_BIT_STRING_new()) == NULL) {
ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_MALLOC_FAILURE);
goto err;
}
curve->seed->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07);
curve->seed->flags |= ASN1_STRING_FLAG_BITS_LEFT;
if (!ASN1_BIT_STRING_set(curve->seed, group->seed,
(int)group->seed_len)) {
ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_ASN1_LIB);
goto err;
}
} else {
if (curve->seed) {
ASN1_BIT_STRING_free(curve->seed);
curve->seed = NULL;
}
}
ok = 1;
err:if (buffer_1)
OPENSSL_free(buffer_1);
if (buffer_2)
OPENSSL_free(buffer_2);
if (tmp_1)
BN_free(tmp_1);
if (tmp_2)
BN_free(tmp_2);
return (ok);
}
static ECPARAMETERS *ec_asn1_group2parameters(const EC_GROUP *group,
ECPARAMETERS *param)
{
int ok = 0;
size_t len = 0;
ECPARAMETERS *ret = NULL;
BIGNUM *tmp = NULL;
unsigned char *buffer = NULL;
const EC_POINT *point = NULL;
point_conversion_form_t form;
if ((tmp = BN_new()) == NULL) {
ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_MALLOC_FAILURE);
goto err;
}
if (param == NULL) {
if ((ret = ECPARAMETERS_new()) == NULL) {
ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_MALLOC_FAILURE);
goto err;
}
} else
ret = param;
/* set the version (always one) */
ret->version = (long)0x1;
/* set the fieldID */
if (!ec_asn1_group2fieldid(group, ret->fieldID)) {
ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_EC_LIB);
goto err;
}
/* set the curve */
if (!ec_asn1_group2curve(group, ret->curve)) {
ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_EC_LIB);
goto err;
}
/* set the base point */
if ((point = EC_GROUP_get0_generator(group)) == NULL) {
ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, EC_R_UNDEFINED_GENERATOR);
goto err;
}
form = EC_GROUP_get_point_conversion_form(group);
len = EC_POINT_point2oct(group, point, form, NULL, len, NULL);
if (len == 0) {
ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_EC_LIB);
goto err;
}
if ((buffer = OPENSSL_malloc(len)) == NULL) {
ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_MALLOC_FAILURE);
goto err;
}
if (!EC_POINT_point2oct(group, point, form, buffer, len, NULL)) {
ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_EC_LIB);
goto err;
}
if (ret->base == NULL && (ret->base = ASN1_OCTET_STRING_new()) == NULL) {
ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_MALLOC_FAILURE);
goto err;
}
if (!ASN1_OCTET_STRING_set(ret->base, buffer, len)) {
ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_ASN1_LIB);
goto err;
}
/* set the order */
if (!EC_GROUP_get_order(group, tmp, NULL)) {
ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_EC_LIB);
goto err;
}
ret->order = BN_to_ASN1_INTEGER(tmp, ret->order);
if (ret->order == NULL) {
ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_ASN1_LIB);
goto err;
}
/* set the cofactor (optional) */
if (EC_GROUP_get_cofactor(group, tmp, NULL)) {
ret->cofactor = BN_to_ASN1_INTEGER(tmp, ret->cofactor);
if (ret->cofactor == NULL) {
ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_ASN1_LIB);
goto err;
}
}
ok = 1;
err:if (!ok) {
if (ret && !param)
ECPARAMETERS_free(ret);
ret = NULL;
}
if (tmp)
BN_free(tmp);
if (buffer)
OPENSSL_free(buffer);
return (ret);
}
ECPKPARAMETERS *ec_asn1_group2pkparameters(const EC_GROUP *group,
ECPKPARAMETERS *params)
{
int ok = 1, tmp;
ECPKPARAMETERS *ret = params;
if (ret == NULL) {
if ((ret = ECPKPARAMETERS_new()) == NULL) {
ECerr(EC_F_EC_ASN1_GROUP2PKPARAMETERS, ERR_R_MALLOC_FAILURE);
return NULL;
}
} else {
if (ret->type == 0 && ret->value.named_curve)
ASN1_OBJECT_free(ret->value.named_curve);
else if (ret->type == 1 && ret->value.parameters)
ECPARAMETERS_free(ret->value.parameters);
}
if (EC_GROUP_get_asn1_flag(group)) {
/*
* use the asn1 OID to describe the the elliptic curve parameters
*/
tmp = EC_GROUP_get_curve_name(group);
if (tmp) {
ret->type = 0;
if ((ret->value.named_curve = OBJ_nid2obj(tmp)) == NULL)
ok = 0;
} else
/* we don't kmow the nid => ERROR */
ok = 0;
} else {
/* use the ECPARAMETERS structure */
ret->type = 1;
if ((ret->value.parameters =
ec_asn1_group2parameters(group, NULL)) == NULL)
ok = 0;
}
if (!ok) {
ECPKPARAMETERS_free(ret);
return NULL;
}
return ret;
}
static EC_GROUP *ec_asn1_parameters2group(const ECPARAMETERS *params)
{
int ok = 0, tmp;
EC_GROUP *ret = NULL;
BIGNUM *p = NULL, *a = NULL, *b = NULL;
EC_POINT *point = NULL;
long field_bits;
if (!params->fieldID || !params->fieldID->fieldType ||
!params->fieldID->p.ptr) {
ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_ASN1_ERROR);
goto err;
}
/* now extract the curve parameters a and b */
if (!params->curve || !params->curve->a ||
!params->curve->a->data || !params->curve->b ||
!params->curve->b->data) {
ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_ASN1_ERROR);
goto err;
}
a = BN_bin2bn(params->curve->a->data, params->curve->a->length, NULL);
if (a == NULL) {
ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_BN_LIB);
goto err;
}
b = BN_bin2bn(params->curve->b->data, params->curve->b->length, NULL);
if (b == NULL) {
ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_BN_LIB);
goto err;
}
/* get the field parameters */
tmp = OBJ_obj2nid(params->fieldID->fieldType);
if (tmp == NID_X9_62_characteristic_two_field)
#ifdef OPENSSL_NO_EC2M
{
ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_GF2M_NOT_SUPPORTED);
goto err;
}
#else
{
X9_62_CHARACTERISTIC_TWO *char_two;
char_two = params->fieldID->p.char_two;
field_bits = char_two->m;
if (field_bits > OPENSSL_ECC_MAX_FIELD_BITS) {
ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_FIELD_TOO_LARGE);
goto err;
}
if ((p = BN_new()) == NULL) {
ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_MALLOC_FAILURE);
goto err;
}
/* get the base type */
tmp = OBJ_obj2nid(char_two->type);
if (tmp == NID_X9_62_tpBasis) {
long tmp_long;
if (!char_two->p.tpBasis) {
ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_ASN1_ERROR);
goto err;
}
tmp_long = ASN1_INTEGER_get(char_two->p.tpBasis);
if (!(char_two->m > tmp_long && tmp_long > 0)) {
ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP,
EC_R_INVALID_TRINOMIAL_BASIS);
goto err;
}
/* create the polynomial */
if (!BN_set_bit(p, (int)char_two->m))
goto err;
if (!BN_set_bit(p, (int)tmp_long))
goto err;
if (!BN_set_bit(p, 0))
goto err;
} else if (tmp == NID_X9_62_ppBasis) {
X9_62_PENTANOMIAL *penta;
penta = char_two->p.ppBasis;
if (!penta) {
ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_ASN1_ERROR);
goto err;
}
if (!
(char_two->m > penta->k3 && penta->k3 > penta->k2
&& penta->k2 > penta->k1 && penta->k1 > 0)) {
ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP,
EC_R_INVALID_PENTANOMIAL_BASIS);
goto err;
}
/* create the polynomial */
if (!BN_set_bit(p, (int)char_two->m))
goto err;
if (!BN_set_bit(p, (int)penta->k1))
goto err;
if (!BN_set_bit(p, (int)penta->k2))
goto err;
if (!BN_set_bit(p, (int)penta->k3))
goto err;
if (!BN_set_bit(p, 0))
goto err;
} else if (tmp == NID_X9_62_onBasis) {
ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_NOT_IMPLEMENTED);
goto err;
} else { /* error */
ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_ASN1_ERROR);
goto err;
}
/* create the EC_GROUP structure */
ret = EC_GROUP_new_curve_GF2m(p, a, b, NULL);
}
#endif
else if (tmp == NID_X9_62_prime_field) {
/* we have a curve over a prime field */
/* extract the prime number */
if (!params->fieldID->p.prime) {
ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_ASN1_ERROR);
goto err;
}
p = ASN1_INTEGER_to_BN(params->fieldID->p.prime, NULL);
if (p == NULL) {
ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_ASN1_LIB);
goto err;
}
if (BN_is_negative(p) || BN_is_zero(p)) {
ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_INVALID_FIELD);
goto err;
}
field_bits = BN_num_bits(p);
if (field_bits > OPENSSL_ECC_MAX_FIELD_BITS) {
ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_FIELD_TOO_LARGE);
goto err;
}
/* create the EC_GROUP structure */
ret = EC_GROUP_new_curve_GFp(p, a, b, NULL);
} else {
ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_INVALID_FIELD);
goto err;
}
if (ret == NULL) {
ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_EC_LIB);
goto err;
}
/* extract seed (optional) */
if (params->curve->seed != NULL) {
if (ret->seed != NULL)
OPENSSL_free(ret->seed);
if (!(ret->seed = OPENSSL_malloc(params->curve->seed->length))) {
ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_MALLOC_FAILURE);
goto err;
}
memcpy(ret->seed, params->curve->seed->data,
params->curve->seed->length);
ret->seed_len = params->curve->seed->length;
}
if (!params->order || !params->base || !params->base->data) {
ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_ASN1_ERROR);
goto err;
}
if ((point = EC_POINT_new(ret)) == NULL)
goto err;
/* set the point conversion form */
EC_GROUP_set_point_conversion_form(ret, (point_conversion_form_t)
(params->base->data[0] & ~0x01));
/* extract the ec point */
if (!EC_POINT_oct2point(ret, point, params->base->data,
params->base->length, NULL)) {
ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_EC_LIB);
goto err;
}
/* extract the order */
if ((a = ASN1_INTEGER_to_BN(params->order, a)) == NULL) {
ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_ASN1_LIB);
goto err;
}
if (BN_is_negative(a) || BN_is_zero(a)) {
ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_INVALID_GROUP_ORDER);
goto err;
}
if (BN_num_bits(a) > (int)field_bits + 1) { /* Hasse bound */
ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_INVALID_GROUP_ORDER);
goto err;
}
/* extract the cofactor (optional) */
if (params->cofactor == NULL) {
if (b) {
BN_free(b);
b = NULL;
}
} else if ((b = ASN1_INTEGER_to_BN(params->cofactor, b)) == NULL) {
ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_ASN1_LIB);
goto err;
}
/* set the generator, order and cofactor (if present) */
if (!EC_GROUP_set_generator(ret, point, a, b)) {
ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_EC_LIB);
goto err;
}
ok = 1;
err:if (!ok) {
if (ret)
EC_GROUP_clear_free(ret);
ret = NULL;
}
if (p)
BN_free(p);
if (a)
BN_free(a);
if (b)
BN_free(b);
if (point)
EC_POINT_free(point);
return (ret);
}
EC_GROUP *ec_asn1_pkparameters2group(const ECPKPARAMETERS *params)
{
EC_GROUP *ret = NULL;
int tmp = 0;
if (params == NULL) {
ECerr(EC_F_EC_ASN1_PKPARAMETERS2GROUP, EC_R_MISSING_PARAMETERS);
return NULL;
}
if (params->type == 0) { /* the curve is given by an OID */
tmp = OBJ_obj2nid(params->value.named_curve);
if ((ret = EC_GROUP_new_by_curve_name(tmp)) == NULL) {
ECerr(EC_F_EC_ASN1_PKPARAMETERS2GROUP,
EC_R_EC_GROUP_NEW_BY_NAME_FAILURE);
return NULL;
}
EC_GROUP_set_asn1_flag(ret, OPENSSL_EC_NAMED_CURVE);
} else if (params->type == 1) { /* the parameters are given by a
* ECPARAMETERS structure */
ret = ec_asn1_parameters2group(params->value.parameters);
if (!ret) {
ECerr(EC_F_EC_ASN1_PKPARAMETERS2GROUP, ERR_R_EC_LIB);
return NULL;
}
EC_GROUP_set_asn1_flag(ret, 0x0);
} else if (params->type == 2) { /* implicitlyCA */
return NULL;
} else {
ECerr(EC_F_EC_ASN1_PKPARAMETERS2GROUP, EC_R_ASN1_ERROR);
return NULL;
}
return ret;
}
/* EC_GROUP <-> DER encoding of ECPKPARAMETERS */
EC_GROUP *d2i_ECPKParameters(EC_GROUP **a, const unsigned char **in, long len)
{
EC_GROUP *group = NULL;
ECPKPARAMETERS *params = NULL;
if ((params = d2i_ECPKPARAMETERS(NULL, in, len)) == NULL) {
ECerr(EC_F_D2I_ECPKPARAMETERS, EC_R_D2I_ECPKPARAMETERS_FAILURE);
ECPKPARAMETERS_free(params);
return NULL;
}
if ((group = ec_asn1_pkparameters2group(params)) == NULL) {
ECerr(EC_F_D2I_ECPKPARAMETERS, EC_R_PKPARAMETERS2GROUP_FAILURE);
ECPKPARAMETERS_free(params);
return NULL;
}
if (a && *a)
EC_GROUP_clear_free(*a);
if (a)
*a = group;
ECPKPARAMETERS_free(params);
return (group);
}
int i2d_ECPKParameters(const EC_GROUP *a, unsigned char **out)
{
int ret = 0;
ECPKPARAMETERS *tmp = ec_asn1_group2pkparameters(a, NULL);
if (tmp == NULL) {
ECerr(EC_F_I2D_ECPKPARAMETERS, EC_R_GROUP2PKPARAMETERS_FAILURE);
return 0;
}
if ((ret = i2d_ECPKPARAMETERS(tmp, out)) == 0) {
ECerr(EC_F_I2D_ECPKPARAMETERS, EC_R_I2D_ECPKPARAMETERS_FAILURE);
ECPKPARAMETERS_free(tmp);
return 0;
}
ECPKPARAMETERS_free(tmp);
return (ret);
}
/* some EC_KEY functions */
EC_KEY *d2i_ECPrivateKey(EC_KEY **a, const unsigned char **in, long len)
{
int ok = 0;
EC_KEY *ret = NULL;
EC_PRIVATEKEY *priv_key = NULL;
if ((priv_key = d2i_EC_PRIVATEKEY(NULL, in, len)) == NULL) {
ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_EC_LIB);
return NULL;
}
if (a == NULL || *a == NULL) {
if ((ret = EC_KEY_new()) == NULL) {
ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_MALLOC_FAILURE);
goto err;
}
} else
ret = *a;
if (priv_key->parameters) {
if (ret->group)
EC_GROUP_clear_free(ret->group);
ret->group = ec_asn1_pkparameters2group(priv_key->parameters);
}
if (ret->group == NULL) {
ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_EC_LIB);
goto err;
}
ret->version = priv_key->version;
if (priv_key->privateKey) {
ret->priv_key = BN_bin2bn(M_ASN1_STRING_data(priv_key->privateKey),
M_ASN1_STRING_length(priv_key->privateKey),
ret->priv_key);
if (ret->priv_key == NULL) {
ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_BN_LIB);
goto err;
}
} else {
ECerr(EC_F_D2I_ECPRIVATEKEY, EC_R_MISSING_PRIVATE_KEY);
goto err;
}
if (ret->pub_key)
EC_POINT_clear_free(ret->pub_key);
ret->pub_key = EC_POINT_new(ret->group);
if (ret->pub_key == NULL) {
ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_EC_LIB);
goto err;
}
if (priv_key->publicKey) {
const unsigned char *pub_oct;
int pub_oct_len;
pub_oct = M_ASN1_STRING_data(priv_key->publicKey);
pub_oct_len = M_ASN1_STRING_length(priv_key->publicKey);
/*
* The first byte - point conversion form - must be present.
*/
if (pub_oct_len <= 0) {
ECerr(EC_F_D2I_ECPRIVATEKEY, EC_R_BUFFER_TOO_SMALL);
goto err;
}
/* Save the point conversion form. */
ret->conv_form = (point_conversion_form_t) (pub_oct[0] & ~0x01);
if (!EC_POINT_oct2point(ret->group, ret->pub_key,
pub_oct, (size_t)(pub_oct_len), NULL)) {
ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_EC_LIB);
goto err;
}
} else {
if (!EC_POINT_mul
(ret->group, ret->pub_key, ret->priv_key, NULL, NULL, NULL)) {
ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_EC_LIB);
goto err;
}
/* Remember the original private-key-only encoding. */
ret->enc_flag |= EC_PKEY_NO_PUBKEY;
}
if (a)
*a = ret;
ok = 1;
err:
if (!ok) {
if (ret && (a == NULL || *a != ret))
EC_KEY_free(ret);
ret = NULL;
}
if (priv_key)
EC_PRIVATEKEY_free(priv_key);
return (ret);
}
int i2d_ECPrivateKey(EC_KEY *a, unsigned char **out)
{
int ret = 0, ok = 0;
unsigned char *buffer = NULL;
size_t buf_len = 0, tmp_len, bn_len;
EC_PRIVATEKEY *priv_key = NULL;
if (a == NULL || a->group == NULL || a->priv_key == NULL ||
(!(a->enc_flag & EC_PKEY_NO_PUBKEY) && a->pub_key == NULL)) {
ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_PASSED_NULL_PARAMETER);
goto err;
}
if ((priv_key = EC_PRIVATEKEY_new()) == NULL) {
ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_MALLOC_FAILURE);
goto err;
}
priv_key->version = a->version;
bn_len = (size_t)BN_num_bytes(a->priv_key);
/* Octetstring may need leading zeros if BN is to short */
buf_len = (EC_GROUP_get_degree(a->group) + 7) / 8;
if (bn_len > buf_len) {
ECerr(EC_F_I2D_ECPRIVATEKEY, EC_R_BUFFER_TOO_SMALL);
goto err;
}
buffer = OPENSSL_malloc(buf_len);
if (buffer == NULL) {
ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_MALLOC_FAILURE);
goto err;
}
if (!BN_bn2bin(a->priv_key, buffer + buf_len - bn_len)) {
ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_BN_LIB);
goto err;
}
if (buf_len - bn_len > 0) {
memset(buffer, 0, buf_len - bn_len);
}
if (!M_ASN1_OCTET_STRING_set(priv_key->privateKey, buffer, buf_len)) {
ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_ASN1_LIB);
goto err;
}
if (!(a->enc_flag & EC_PKEY_NO_PARAMETERS)) {
if ((priv_key->parameters =
ec_asn1_group2pkparameters(a->group,
priv_key->parameters)) == NULL) {
ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_EC_LIB);
goto err;
}
}
if (!(a->enc_flag & EC_PKEY_NO_PUBKEY)) {
priv_key->publicKey = M_ASN1_BIT_STRING_new();
if (priv_key->publicKey == NULL) {
ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_MALLOC_FAILURE);
goto err;
}
tmp_len = EC_POINT_point2oct(a->group, a->pub_key,
a->conv_form, NULL, 0, NULL);
if (tmp_len > buf_len) {
unsigned char *tmp_buffer = OPENSSL_realloc(buffer, tmp_len);
if (!tmp_buffer) {
ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_MALLOC_FAILURE);
goto err;
}
buffer = tmp_buffer;
buf_len = tmp_len;
}
if (!EC_POINT_point2oct(a->group, a->pub_key,
a->conv_form, buffer, buf_len, NULL)) {
ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_EC_LIB);
goto err;
}
priv_key->publicKey->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07);
priv_key->publicKey->flags |= ASN1_STRING_FLAG_BITS_LEFT;
if (!M_ASN1_BIT_STRING_set(priv_key->publicKey, buffer, buf_len)) {
ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_ASN1_LIB);
goto err;
}
}
if ((ret = i2d_EC_PRIVATEKEY(priv_key, out)) == 0) {
ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_EC_LIB);
goto err;
}
ok = 1;
err:
if (buffer)
OPENSSL_free(buffer);
if (priv_key)
EC_PRIVATEKEY_free(priv_key);
return (ok ? ret : 0);
}
int i2d_ECParameters(EC_KEY *a, unsigned char **out)
{
if (a == NULL) {
ECerr(EC_F_I2D_ECPARAMETERS, ERR_R_PASSED_NULL_PARAMETER);
return 0;
}
return i2d_ECPKParameters(a->group, out);
}
EC_KEY *d2i_ECParameters(EC_KEY **a, const unsigned char **in, long len)
{
EC_KEY *ret;
if (in == NULL || *in == NULL) {
ECerr(EC_F_D2I_ECPARAMETERS, ERR_R_PASSED_NULL_PARAMETER);
return NULL;
}
if (a == NULL || *a == NULL) {
if ((ret = EC_KEY_new()) == NULL) {
ECerr(EC_F_D2I_ECPARAMETERS, ERR_R_MALLOC_FAILURE);
return NULL;
}
} else
ret = *a;
if (!d2i_ECPKParameters(&ret->group, in, len)) {
ECerr(EC_F_D2I_ECPARAMETERS, ERR_R_EC_LIB);
if (a == NULL || *a != ret)
EC_KEY_free(ret);
return NULL;
}
if (a)
*a = ret;
return ret;
}
EC_KEY *o2i_ECPublicKey(EC_KEY **a, const unsigned char **in, long len)
{
EC_KEY *ret = NULL;
if (a == NULL || (*a) == NULL || (*a)->group == NULL) {
/*
* sorry, but a EC_GROUP-structur is necessary to set the public key
*/
ECerr(EC_F_O2I_ECPUBLICKEY, ERR_R_PASSED_NULL_PARAMETER);
return 0;
}
ret = *a;
if (ret->pub_key == NULL &&
(ret->pub_key = EC_POINT_new(ret->group)) == NULL) {
ECerr(EC_F_O2I_ECPUBLICKEY, ERR_R_MALLOC_FAILURE);
return 0;
}
if (!EC_POINT_oct2point(ret->group, ret->pub_key, *in, len, NULL)) {
ECerr(EC_F_O2I_ECPUBLICKEY, ERR_R_EC_LIB);
return 0;
}
/* save the point conversion form */
ret->conv_form = (point_conversion_form_t) (*in[0] & ~0x01);
*in += len;
return ret;
}
int i2o_ECPublicKey(EC_KEY *a, unsigned char **out)
{
size_t buf_len = 0;
int new_buffer = 0;
if (a == NULL) {
ECerr(EC_F_I2O_ECPUBLICKEY, ERR_R_PASSED_NULL_PARAMETER);
return 0;
}
buf_len = EC_POINT_point2oct(a->group, a->pub_key,
a->conv_form, NULL, 0, NULL);
if (out == NULL || buf_len == 0)
/* out == NULL => just return the length of the octet string */
return buf_len;
if (*out == NULL) {
if ((*out = OPENSSL_malloc(buf_len)) == NULL) {
ECerr(EC_F_I2O_ECPUBLICKEY, ERR_R_MALLOC_FAILURE);
return 0;
}
new_buffer = 1;
}
if (!EC_POINT_point2oct(a->group, a->pub_key, a->conv_form,
*out, buf_len, NULL)) {
ECerr(EC_F_I2O_ECPUBLICKEY, ERR_R_EC_LIB);
if (new_buffer) {
OPENSSL_free(*out);
*out = NULL;
}
return 0;
}
if (!new_buffer)
*out += buf_len;
return buf_len;
}
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