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openssl/crypto/ec/ec_asn1.c
Bodo Möller 254ef80db1 simplify asn1_flag 
Submitted by: Nils Larsch
Reviewed by: Bodo Moeller
2002-06-12 14:01:17 +00:00

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/* crypto/ec/ec_asn1.c */
/* ====================================================================
* Copyright (c) 2000-2002 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 "cryptlib.h"
#include "ec_lcl.h"
#include <openssl/asn1.h>
#include <openssl/asn1t.h>
#include <openssl/objects.h>
/* some structures needed for the asn1 encoding */
typedef struct x9_62_fieldid_st {
ASN1_OBJECT *fieldType;
ASN1_TYPE *parameters;
} X9_62_FIELDID;
typedef struct x9_62_characteristic_two_st {
ASN1_INTEGER *m;
ASN1_OBJECT *basis;
ASN1_TYPE *parameters;
} X9_62_CHARACTERISTIC_TWO;
typedef struct x9_62_pentanomial_st {
ASN1_INTEGER k1;
ASN1_INTEGER k2;
ASN1_INTEGER k3;
} X9_62_PENTANOMIAL;
typedef struct x9_62_curve_st {
ASN1_OCTET_STRING *a;
ASN1_OCTET_STRING *b;
ASN1_BIT_STRING *seed;
} X9_62_CURVE;
struct ec_parameters_st {
ASN1_INTEGER *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 */;
/* the OpenSSL asn1 definitions */
ASN1_SEQUENCE(X9_62_FIELDID) = {
ASN1_SIMPLE(X9_62_FIELDID, fieldType, ASN1_OBJECT),
ASN1_SIMPLE(X9_62_FIELDID, parameters, ASN1_ANY)
} ASN1_SEQUENCE_END(X9_62_FIELDID)
DECLARE_ASN1_FUNCTIONS_const(X9_62_FIELDID)
DECLARE_ASN1_ENCODE_FUNCTIONS_const(X9_62_FIELDID, X9_62_FIELDID)
IMPLEMENT_ASN1_FUNCTIONS_const(X9_62_FIELDID)
ASN1_SEQUENCE(X9_62_CHARACTERISTIC_TWO) = {
ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, m, ASN1_INTEGER),
ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, basis, ASN1_OBJECT),
ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, parameters, ASN1_ANY)
} ASN1_SEQUENCE_END(X9_62_CHARACTERISTIC_TWO)
DECLARE_ASN1_FUNCTIONS_const(X9_62_CHARACTERISTIC_TWO)
DECLARE_ASN1_ENCODE_FUNCTIONS_const(X9_62_CHARACTERISTIC_TWO, X9_62_CHARACTERISTIC_TWO)
IMPLEMENT_ASN1_FUNCTIONS_const(X9_62_CHARACTERISTIC_TWO)
ASN1_SEQUENCE(X9_62_PENTANOMIAL) = {
ASN1_SIMPLE(X9_62_PENTANOMIAL, k1, ASN1_INTEGER),
ASN1_SIMPLE(X9_62_PENTANOMIAL, k2, ASN1_INTEGER),
ASN1_SIMPLE(X9_62_PENTANOMIAL, k3, ASN1_INTEGER)
} ASN1_SEQUENCE_END(X9_62_PENTANOMIAL)
DECLARE_ASN1_FUNCTIONS_const(X9_62_PENTANOMIAL)
DECLARE_ASN1_ENCODE_FUNCTIONS_const(X9_62_PENTANOMIAL, X9_62_PENTANOMIAL)
IMPLEMENT_ASN1_FUNCTIONS_const(X9_62_PENTANOMIAL)
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)
DECLARE_ASN1_FUNCTIONS_const(X9_62_CURVE)
DECLARE_ASN1_ENCODE_FUNCTIONS_const(X9_62_CURVE, X9_62_CURVE)
IMPLEMENT_ASN1_FUNCTIONS_const(X9_62_CURVE)
ASN1_SEQUENCE(ECPARAMETERS) = {
ASN1_SIMPLE(ECPARAMETERS, version, ASN1_INTEGER),
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_SIMPLE(ECPARAMETERS, cofactor, ASN1_INTEGER)
} ASN1_SEQUENCE_END(ECPARAMETERS)
DECLARE_ASN1_FUNCTIONS_const(ECPARAMETERS)
IMPLEMENT_ASN1_FUNCTIONS_const(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)
IMPLEMENT_ASN1_FUNCTIONS_const(ECPKPARAMETERS)
/* some internal functions */
static X9_62_FIELDID *ec_asn1_group2field(const EC_GROUP *, X9_62_FIELDID *);
static X9_62_CURVE *ec_asn1_group2curve(const EC_GROUP *, X9_62_CURVE *);
static EC_GROUP *ec_asn1_parameters2group(const ECPARAMETERS *);
static ECPARAMETERS *ec_asn1_group2parameters(const EC_GROUP *,
ECPARAMETERS *);
static X9_62_FIELDID *ec_asn1_group2field(const EC_GROUP *group,
X9_62_FIELDID *field)
{
int ok=0, nid;
X9_62_FIELDID *ret=NULL;
BIGNUM *tmp=NULL;
if (field == NULL)
{
if ((ret = X9_62_FIELDID_new()) == NULL)
{
ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE);
return NULL;
}
}
else
{
ret = field;
if (ret->fieldType != NULL)
ASN1_OBJECT_free(ret->fieldType);
if (ret->parameters != NULL)
ASN1_TYPE_free(ret->parameters);
}
nid = EC_METHOD_get_field_type(EC_GROUP_method_of(group));
if ((ret->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;
}
if ((ret->parameters = ASN1_TYPE_new()) == NULL)
{
ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE);
goto err;
}
ret->parameters->type = V_ASN1_INTEGER;
if (!EC_GROUP_get_curve_GFp(group, tmp, NULL, NULL, NULL))
{
ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_EC_LIB);
goto err;
}
ret->parameters->value.integer = BN_to_ASN1_INTEGER(tmp, NULL);
if (ret->parameters->value.integer == NULL)
{
ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_ASN1_LIB);
goto err;
}
}
else
goto err;
ok = 1;
err : if (!ok)
{
if (ret && !field)
X9_62_FIELDID_free(ret);
ret = NULL;
}
if (tmp)
BN_free(tmp);
return(ret);
}
static X9_62_CURVE *ec_asn1_group2curve(const EC_GROUP *group,
X9_62_CURVE *curve)
{
int ok=0, nid;
X9_62_CURVE *ret=NULL;
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 ((tmp_1 = BN_new()) == NULL || (tmp_2 = BN_new()) == NULL)
{
ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_MALLOC_FAILURE);
goto err;
}
if (curve == NULL)
{
if ((ret = X9_62_CURVE_new()) == NULL)
{
ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_MALLOC_FAILURE);
goto err;
}
}
else
{
ret = curve;
if (ret->a)
ASN1_OCTET_STRING_free(ret->a);
if (ret->b)
ASN1_OCTET_STRING_free(ret->b);
if (ret->seed)
ASN1_BIT_STRING_free(ret->seed);
}
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;
}
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;
}
}
else
goto err;
/* set a and b */
if ((ret->a = M_ASN1_OCTET_STRING_new()) == NULL ||
(ret->b = M_ASN1_OCTET_STRING_new()) == NULL )
{
ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_MALLOC_FAILURE);
goto err;
}
if (!M_ASN1_OCTET_STRING_set(ret->a, a_buf, len_1) ||
!M_ASN1_OCTET_STRING_set(ret->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 ((ret->seed = ASN1_BIT_STRING_new()) == NULL) goto err;
if (!ASN1_BIT_STRING_set(ret->seed, group->seed,
(int)group->seed_len))
{
ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_ASN1_LIB);
goto err;
}
}
else
ret->seed = NULL;
ok = 1;
err : if (!ok)
{
if (ret && !curve)
X9_62_CURVE_free(ret);
ret = NULL;
}
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(ret);
}
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) */
if (ret->version == NULL && !(ret->version = ASN1_INTEGER_new()))
{
ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_MALLOC_FAILURE);
goto err;
}
if (!ASN1_INTEGER_set(ret->version, (long)0x1))
{
ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_ASN1_LIB);
goto err;
}
/* set the fieldID */
ret->fieldID = ec_asn1_group2field(group, ret->fieldID);
if (ret->fieldID == NULL)
{
ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_EC_LIB);
goto err;
}
/* set the curve */
ret->curve = ec_asn1_group2curve(group, ret->curve);
if (ret->curve == NULL)
{
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 */
if (!EC_GROUP_get_cofactor(group, tmp, NULL))
{
ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_EC_LIB);
goto err;
}
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_nid(group);
if (tmp)
{
ret->type = 0;
if ((ret->value.named_curve = OBJ_nid2obj(tmp)) == NULL)
ok = 0;
}
else
{
/* we have no nid => use the normal
* ECPARAMETERS structure
*/
ret->type = 1;
if ((ret->value.parameters = ec_asn1_group2parameters(
group, NULL)) == NULL)
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;
if (!params->fieldID || !params->fieldID->fieldType ||
!params->fieldID->parameters)
{
ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_ASN1_ERROR);
goto err;
}
tmp = OBJ_obj2nid(params->fieldID->fieldType);
if (tmp == NID_X9_62_characteristic_two_field)
{
ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_NOT_IMPLEMENTED);
goto err;
}
else if (tmp == NID_X9_62_prime_field)
{
/* we have a curve over a prime field */
/* extract the prime number */
if (params->fieldID->parameters->type != V_ASN1_INTEGER ||
!params->fieldID->parameters->value.integer)
{
ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_ASN1_ERROR);
goto err;
}
p = ASN1_INTEGER_to_BN(params->fieldID->parameters->value.integer, NULL);
if (p == NULL)
{
ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_ASN1_LIB);
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;
}
/* create the EC_GROUP structure */
/* TODO */
ret = EC_GROUP_new_curve_GFp(p, a, b, NULL);
if (ret == NULL)
{
ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_EC_LIB);
goto err;
}
/* create the generator */
if ((point = EC_POINT_new(ret)) == NULL) goto err;
}
else
{
ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_ASN1_UNKNOWN_FIELD);
goto err;
}
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->cofactor || !params->base ||
!params->base->data)
{
ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_ASN1_ERROR);
goto err;
}
a = ASN1_INTEGER_to_BN(params->order, a);
b = ASN1_INTEGER_to_BN(params->cofactor, b);
if (!a || !b)
{
ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_ASN1_LIB);
goto err;
}
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;
}
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_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_PARAMETERS2GROUP, EC_R_ASN1_ERROR);
return NULL;
}
return ret;
}
/* EC_GROUP <-> DER encoding of EC[PK]PARAMETERS */
EC_GROUP *d2i_ECParameters(EC_GROUP **a, const unsigned char **in, long len)
{
EC_GROUP *group = NULL;
ECPARAMETERS *params = NULL;
if ((params = d2i_ECPARAMETERS(NULL, in, len)) == NULL)
{
ECerr(EC_F_D2I_ECPARAMETERS, EC_R_D2I_ECPARAMETERS_FAILURE);
ECPARAMETERS_free(params);
return NULL;
}
if ((group = ec_asn1_parameters2group(params)) == NULL)
{
ECerr(EC_F_D2I_ECPARAMETERS, EC_R_PARAMETERS2GROUP_FAILURE);
return NULL;
}
if (a && *a)
EC_GROUP_clear_free(*a);
if (a)
*a = group;
ECPARAMETERS_free(params);
return(group);
}
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);
return NULL;
}
if (a && *a)
EC_GROUP_clear_free(*a);
if (a)
*a = group;
ECPKPARAMETERS_free(params);
return(group);
}
int i2d_ECParameters(const EC_GROUP *a, unsigned char **out)
{
int ret=0;
ECPARAMETERS *tmp = ec_asn1_group2parameters(a, NULL);
if (tmp == NULL)
{
ECerr(EC_F_I2D_ECPARAMETERS, EC_R_GROUP2PARAMETERS_FAILURE);
return 0;
}
if ((ret = i2d_ECPARAMETERS(tmp, out)) == 0)
{
ECerr(EC_F_I2D_ECPARAMETERS, EC_R_I2D_EC_PARAMETERS_FAILURE);
ECPARAMETERS_free(tmp);
return 0;
}
ECPARAMETERS_free(tmp);
return(ret);
}
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);
}
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