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openssl/crypto/ec/ec_asn1.c
Bernd Edlinger f28bc7d386 Fix potential memory leaks with BN_to_ASN1_INTEGER 
Reviewed-by: Paul Dale <paul.dale@oracle.com>
Reviewed-by: Matt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/9833)
2019-09-13 13:21:13 +02:00

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/*
* Copyright 2002-2018 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
#include <string.h>
#include "ec_lcl.h"
#include <openssl/err.h>
#include <openssl/asn1t.h>
#include <openssl/objects.h>
#include "internal/nelem.h"
#include "internal/asn1_dsa.h"
#ifndef FIPS_MODE
int EC_GROUP_get_basis_type(const EC_GROUP *group)
{
int i;
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;
/* Find the last non-zero element of group->poly[] */
for (i = 0;
i < (int)OSSL_NELEM(group->poly) && group->poly[i] != 0;
i++)
continue;
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 {
int32_t k1;
int32_t k2;
int32_t k3;
} X9_62_PENTANOMIAL;
typedef struct x9_62_characteristic_two_st {
int32_t 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;
struct ec_parameters_st {
int32_t 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 {
int32_t version;
ASN1_OCTET_STRING *privateKey;
ECPKPARAMETERS *parameters;
ASN1_BIT_STRING *publicKey;
} EC_PRIVATEKEY;
/* the OpenSSL ASN.1 definitions */
ASN1_SEQUENCE(X9_62_PENTANOMIAL) = {
ASN1_EMBED(X9_62_PENTANOMIAL, k1, INT32),
ASN1_EMBED(X9_62_PENTANOMIAL, k2, INT32),
ASN1_EMBED(X9_62_PENTANOMIAL, k3, INT32)
} static_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_EMBED(X9_62_CHARACTERISTIC_TWO, m, INT32),
ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, type, ASN1_OBJECT),
ASN1_ADB_OBJECT(X9_62_CHARACTERISTIC_TWO)
} static_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)
} static_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)
} static_ASN1_SEQUENCE_END(X9_62_CURVE)
ASN1_SEQUENCE(ECPARAMETERS) = {
ASN1_EMBED(ECPARAMETERS, version, INT32),
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(ECPKPARAMETERS)
DECLARE_ASN1_ENCODE_FUNCTIONS_name(ECPKPARAMETERS, ECPKPARAMETERS)
IMPLEMENT_ASN1_FUNCTIONS(ECPKPARAMETERS)
ASN1_SEQUENCE(EC_PRIVATEKEY) = {
ASN1_EMBED(EC_PRIVATEKEY, version, INT32),
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)
} static_ASN1_SEQUENCE_END(EC_PRIVATEKEY)
DECLARE_ASN1_FUNCTIONS(EC_PRIVATEKEY)
DECLARE_ASN1_ENCODE_FUNCTIONS_name(EC_PRIVATEKEY, EC_PRIVATEKEY)
IMPLEMENT_ASN1_FUNCTIONS(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 *);
/* 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) */
ASN1_OBJECT_free(field->fieldType);
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(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 if (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 == NULL) {
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 == NULL) {
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 == NULL) {
ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE);
goto err;
}
}
}
#endif
else {
ECerr(EC_F_EC_ASN1_GROUP2FIELDID, EC_R_UNSUPPORTED_FIELD);
goto err;
}
ok = 1;
err:
BN_free(tmp);
return ok;
}
static int ec_asn1_group2curve(const EC_GROUP *group, X9_62_CURVE *curve)
{
int ok = 0;
BIGNUM *tmp_1 = NULL, *tmp_2 = NULL;
unsigned char *a_buf = NULL, *b_buf = NULL;
size_t len;
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;
}
/* get a and b */
if (!EC_GROUP_get_curve(group, NULL, tmp_1, tmp_2, NULL)) {
ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_EC_LIB);
goto err;
}
/*
* Per SEC 1, the curve coefficients must be padded up to size. See C.2's
* definition of Curve, C.1's definition of FieldElement, and 2.3.5's
* definition of how to encode the field elements.
*/
len = ((size_t)EC_GROUP_get_degree(group) + 7) / 8;
if ((a_buf = OPENSSL_malloc(len)) == NULL
|| (b_buf = OPENSSL_malloc(len)) == NULL) {
ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_MALLOC_FAILURE);
goto err;
}
if (BN_bn2binpad(tmp_1, a_buf, len) < 0
|| BN_bn2binpad(tmp_2, b_buf, len) < 0) {
ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_BN_LIB);
goto err;
}
/* set a and b */
if (!ASN1_OCTET_STRING_set(curve->a, a_buf, len)
|| !ASN1_OCTET_STRING_set(curve->b, b_buf, len)) {
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 {
ASN1_BIT_STRING_free(curve->seed);
curve->seed = NULL;
}
ok = 1;
err:
OPENSSL_free(a_buf);
OPENSSL_free(b_buf);
BN_free(tmp_1);
BN_free(tmp_2);
return ok;
}
ECPARAMETERS *EC_GROUP_get_ecparameters(const EC_GROUP *group,
ECPARAMETERS *params)
{
size_t len = 0;
ECPARAMETERS *ret = NULL;
const BIGNUM *tmp;
unsigned char *buffer = NULL;
const EC_POINT *point = NULL;
point_conversion_form_t form;
ASN1_INTEGER *orig;
if (params == NULL) {
if ((ret = ECPARAMETERS_new()) == NULL) {
ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, ERR_R_MALLOC_FAILURE);
goto err;
}
} else
ret = params;
/* set the version (always one) */
ret->version = (long)0x1;
/* set the fieldID */
if (!ec_asn1_group2fieldid(group, ret->fieldID)) {
ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, ERR_R_EC_LIB);
goto err;
}
/* set the curve */
if (!ec_asn1_group2curve(group, ret->curve)) {
ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, ERR_R_EC_LIB);
goto err;
}
/* set the base point */
if ((point = EC_GROUP_get0_generator(group)) == NULL) {
ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, EC_R_UNDEFINED_GENERATOR);
goto err;
}
form = EC_GROUP_get_point_conversion_form(group);
len = EC_POINT_point2buf(group, point, form, &buffer, NULL);
if (len == 0) {
ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, ERR_R_EC_LIB);
goto err;
}
if (ret->base == NULL && (ret->base = ASN1_OCTET_STRING_new()) == NULL) {
OPENSSL_free(buffer);
ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, ERR_R_MALLOC_FAILURE);
goto err;
}
ASN1_STRING_set0(ret->base, buffer, len);
/* set the order */
tmp = EC_GROUP_get0_order(group);
if (tmp == NULL) {
ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, ERR_R_EC_LIB);
goto err;
}
ret->order = BN_to_ASN1_INTEGER(tmp, orig = ret->order);
if (ret->order == NULL) {
ret->order = orig;
ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, ERR_R_ASN1_LIB);
goto err;
}
/* set the cofactor (optional) */
tmp = EC_GROUP_get0_cofactor(group);
if (tmp != NULL) {
ret->cofactor = BN_to_ASN1_INTEGER(tmp, orig = ret->cofactor);
if (ret->cofactor == NULL) {
ret->cofactor = orig;
ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, ERR_R_ASN1_LIB);
goto err;
}
}
return ret;
err:
if (params == NULL)
ECPARAMETERS_free(ret);
return NULL;
}
ECPKPARAMETERS *EC_GROUP_get_ecpkparameters(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_GROUP_GET_ECPKPARAMETERS, ERR_R_MALLOC_FAILURE);
return NULL;
}
} else {
if (ret->type == 0)
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 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 know the nid => ERROR */
ok = 0;
} else {
/* use the ECPARAMETERS structure */
ret->type = 1;
if ((ret->value.parameters =
EC_GROUP_get_ecparameters(group, NULL)) == NULL)
ok = 0;
}
if (!ok) {
ECPKPARAMETERS_free(ret);
return NULL;
}
return ret;
}
EC_GROUP *EC_GROUP_new_from_ecparameters(const ECPARAMETERS *params)
{
int ok = 0, tmp;
EC_GROUP *ret = NULL, *dup = NULL;
BIGNUM *p = NULL, *a = NULL, *b = NULL;
EC_POINT *point = NULL;
long field_bits;
int curve_name = NID_undef;
BN_CTX *ctx = NULL;
if (!params->fieldID || !params->fieldID->fieldType ||
!params->fieldID->p.ptr) {
ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_ASN1_ERROR);
goto err;
}
/*
* Now extract the curve parameters a and b. Note that, although SEC 1
* specifies the length of their encodings, historical versions of OpenSSL
* encoded them incorrectly, so we must accept any length for backwards
* compatibility.
*/
if (!params->curve || !params->curve->a ||
!params->curve->a->data || !params->curve->b ||
!params->curve->b->data) {
ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, 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_GROUP_NEW_FROM_ECPARAMETERS, 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_GROUP_NEW_FROM_ECPARAMETERS, 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_GROUP_NEW_FROM_ECPARAMETERS, 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_GROUP_NEW_FROM_ECPARAMETERS, EC_R_FIELD_TOO_LARGE);
goto err;
}
if ((p = BN_new()) == NULL) {
ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, 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_GROUP_NEW_FROM_ECPARAMETERS, 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_GROUP_NEW_FROM_ECPARAMETERS,
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_GROUP_NEW_FROM_ECPARAMETERS, 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_GROUP_NEW_FROM_ECPARAMETERS,
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_GROUP_NEW_FROM_ECPARAMETERS, EC_R_NOT_IMPLEMENTED);
goto err;
} else { /* error */
ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, 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_GROUP_NEW_FROM_ECPARAMETERS, EC_R_ASN1_ERROR);
goto err;
}
p = ASN1_INTEGER_to_BN(params->fieldID->p.prime, NULL);
if (p == NULL) {
ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_ASN1_LIB);
goto err;
}
if (BN_is_negative(p) || BN_is_zero(p)) {
ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_INVALID_FIELD);
goto err;
}
field_bits = BN_num_bits(p);
if (field_bits > OPENSSL_ECC_MAX_FIELD_BITS) {
ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, 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_GROUP_NEW_FROM_ECPARAMETERS, EC_R_INVALID_FIELD);
goto err;
}
if (ret == NULL) {
ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_EC_LIB);
goto err;
}
/* extract seed (optional) */
if (params->curve->seed != NULL) {
OPENSSL_free(ret->seed);
if ((ret->seed = OPENSSL_malloc(params->curve->seed->length)) == NULL) {
ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, 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_GROUP_NEW_FROM_ECPARAMETERS, 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_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_EC_LIB);
goto err;
}
/* extract the order */
if ((a = ASN1_INTEGER_to_BN(params->order, a)) == NULL) {
ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_ASN1_LIB);
goto err;
}
if (BN_is_negative(a) || BN_is_zero(a)) {
ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_INVALID_GROUP_ORDER);
goto err;
}
if (BN_num_bits(a) > (int)field_bits + 1) { /* Hasse bound */
ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_INVALID_GROUP_ORDER);
goto err;
}
/* extract the cofactor (optional) */
if (params->cofactor == NULL) {
BN_free(b);
b = NULL;
} else if ((b = ASN1_INTEGER_to_BN(params->cofactor, b)) == NULL) {
ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, 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_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_EC_LIB);
goto err;
}
/*
* Check if the explicit parameters group just created matches one of the
* built-in curves.
*
* We create a copy of the group just built, so that we can remove optional
* fields for the lookup: we do this to avoid the possibility that one of
* the optional parameters is used to force the library into using a less
* performant and less secure EC_METHOD instead of the specialized one.
* In any case, `seed` is not really used in any computation, while a
* cofactor different from the one in the built-in table is just
* mathematically wrong anyway and should not be used.
*/
if ((ctx = BN_CTX_new()) == NULL) {
ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_BN_LIB);
goto err;
}
if ((dup = EC_GROUP_dup(ret)) == NULL
|| EC_GROUP_set_seed(dup, NULL, 0) != 1
|| !EC_GROUP_set_generator(dup, point, a, NULL)) {
ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_EC_LIB);
goto err;
}
if ((curve_name = ec_curve_nid_from_params(dup, ctx)) != NID_undef) {
/*
* The input explicit parameters successfully matched one of the
* built-in curves: often for built-in curves we have specialized
* methods with better performance and hardening.
*
* In this case we replace the `EC_GROUP` created through explicit
* parameters with one created from a named group.
*/
EC_GROUP *named_group = NULL;
#ifndef OPENSSL_NO_EC_NISTP_64_GCC_128
/*
* NID_wap_wsg_idm_ecid_wtls12 and NID_secp224r1 are both aliases for
* the same curve, we prefer the SECP nid when matching explicit
* parameters as that is associated with a specialized EC_METHOD.
*/
if (curve_name == NID_wap_wsg_idm_ecid_wtls12)
curve_name = NID_secp224r1;
#endif /* !def(OPENSSL_NO_EC_NISTP_64_GCC_128) */
if ((named_group = EC_GROUP_new_by_curve_name(curve_name)) == NULL) {
ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_EC_LIB);
goto err;
}
EC_GROUP_free(ret);
ret = named_group;
/*
* Set the flag so that EC_GROUPs created from explicit parameters are
* serialized using explicit parameters by default.
*/
EC_GROUP_set_asn1_flag(ret, OPENSSL_EC_EXPLICIT_CURVE);
}
ok = 1;
err:
if (!ok) {
EC_GROUP_free(ret);
ret = NULL;
}
EC_GROUP_free(dup);
BN_free(p);
BN_free(a);
BN_free(b);
EC_POINT_free(point);
BN_CTX_free(ctx);
return ret;
}
EC_GROUP *EC_GROUP_new_from_ecpkparameters(const ECPKPARAMETERS *params)
{
EC_GROUP *ret = NULL;
int tmp = 0;
if (params == NULL) {
ECerr(EC_F_EC_GROUP_NEW_FROM_ECPKPARAMETERS, 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_GROUP_NEW_FROM_ECPKPARAMETERS,
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_GROUP_new_from_ecparameters(params->value.parameters);
if (!ret) {
ECerr(EC_F_EC_GROUP_NEW_FROM_ECPKPARAMETERS, ERR_R_EC_LIB);
return NULL;
}
EC_GROUP_set_asn1_flag(ret, OPENSSL_EC_EXPLICIT_CURVE);
} else if (params->type == 2) { /* implicitlyCA */
return NULL;
} else {
ECerr(EC_F_EC_GROUP_NEW_FROM_ECPKPARAMETERS, 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;
const unsigned char *p = *in;
if ((params = d2i_ECPKPARAMETERS(NULL, &p, len)) == NULL) {
ECerr(EC_F_D2I_ECPKPARAMETERS, EC_R_D2I_ECPKPARAMETERS_FAILURE);
ECPKPARAMETERS_free(params);
return NULL;
}
if ((group = EC_GROUP_new_from_ecpkparameters(params)) == NULL) {
ECerr(EC_F_D2I_ECPKPARAMETERS, EC_R_PKPARAMETERS2GROUP_FAILURE);
ECPKPARAMETERS_free(params);
return NULL;
}
if (a) {
EC_GROUP_free(*a);
*a = group;
}
ECPKPARAMETERS_free(params);
*in = p;
return group;
}
int i2d_ECPKParameters(const EC_GROUP *a, unsigned char **out)
{
int ret = 0;
ECPKPARAMETERS *tmp = EC_GROUP_get_ecpkparameters(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)
{
EC_KEY *ret = NULL;
EC_PRIVATEKEY *priv_key = NULL;
const unsigned char *p = *in;
if ((priv_key = d2i_EC_PRIVATEKEY(NULL, &p, 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) {
EC_GROUP_free(ret->group);
ret->group = EC_GROUP_new_from_ecpkparameters(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) {
ASN1_OCTET_STRING *pkey = priv_key->privateKey;
if (EC_KEY_oct2priv(ret, ASN1_STRING_get0_data(pkey),
ASN1_STRING_length(pkey)) == 0)
goto err;
} else {
ECerr(EC_F_D2I_ECPRIVATEKEY, EC_R_MISSING_PRIVATE_KEY);
goto err;
}
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 = ASN1_STRING_get0_data(priv_key->publicKey);
pub_oct_len = ASN1_STRING_length(priv_key->publicKey);
if (!EC_KEY_oct2key(ret, pub_oct, pub_oct_len, NULL)) {
ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_EC_LIB);
goto err;
}
} else {
if (ret->group->meth->keygenpub == NULL
|| ret->group->meth->keygenpub(ret) == 0)
goto err;
/* Remember the original private-key-only encoding. */
ret->enc_flag |= EC_PKEY_NO_PUBKEY;
}
if (a)
*a = ret;
EC_PRIVATEKEY_free(priv_key);
*in = p;
return ret;
err:
if (a == NULL || *a != ret)
EC_KEY_free(ret);
EC_PRIVATEKEY_free(priv_key);
return NULL;
}
int i2d_ECPrivateKey(const EC_KEY *a, unsigned char **out)
{
int ret = 0, ok = 0;
unsigned char *priv= NULL, *pub= NULL;
size_t privlen = 0, publen = 0;
EC_PRIVATEKEY *priv_key = NULL;
if (a == NULL || a->group == 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;
privlen = EC_KEY_priv2buf(a, &priv);
if (privlen == 0) {
ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_EC_LIB);
goto err;
}
ASN1_STRING_set0(priv_key->privateKey, priv, privlen);
priv = NULL;
if (!(a->enc_flag & EC_PKEY_NO_PARAMETERS)) {
if ((priv_key->parameters =
EC_GROUP_get_ecpkparameters(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 = ASN1_BIT_STRING_new();
if (priv_key->publicKey == NULL) {
ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_MALLOC_FAILURE);
goto err;
}
publen = EC_KEY_key2buf(a, a->conv_form, &pub, NULL);
if (publen == 0) {
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;
ASN1_STRING_set0(priv_key->publicKey, pub, publen);
pub = NULL;
}
if ((ret = i2d_EC_PRIVATEKEY(priv_key, out)) == 0) {
ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_EC_LIB);
goto err;
}
ok = 1;
err:
OPENSSL_clear_free(priv, privlen);
OPENSSL_free(pub);
EC_PRIVATEKEY_free(priv_key);
return (ok ? ret : 0);
}
int i2d_ECParameters(const 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-structure is necessary to set the public key
*/
ECerr(EC_F_O2I_ECPUBLICKEY, ERR_R_PASSED_NULL_PARAMETER);
return 0;
}
ret = *a;
if (!EC_KEY_oct2key(ret, *in, len, NULL)) {
ECerr(EC_F_O2I_ECPUBLICKEY, ERR_R_EC_LIB);
return 0;
}
*in += len;
return ret;
}
int i2o_ECPublicKey(const 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;
}
DECLARE_ASN1_FUNCTIONS(ECDSA_SIG)
DECLARE_ASN1_ENCODE_FUNCTIONS_name(ECDSA_SIG, ECDSA_SIG)
#endif /* FIPS_MODE */
ECDSA_SIG *ECDSA_SIG_new(void)
{
ECDSA_SIG *sig = OPENSSL_zalloc(sizeof(*sig));
if (sig == NULL)
ECerr(EC_F_ECDSA_SIG_NEW, ERR_R_MALLOC_FAILURE);
return sig;
}
void ECDSA_SIG_free(ECDSA_SIG *sig)
{
if (sig == NULL)
return;
BN_clear_free(sig->r);
BN_clear_free(sig->s);
OPENSSL_free(sig);
}
ECDSA_SIG *d2i_ECDSA_SIG(ECDSA_SIG **psig, const unsigned char **ppin, long len)
{
ECDSA_SIG *sig;
if (len < 0)
return NULL;
if (psig != NULL && *psig != NULL) {
sig = *psig;
} else {
sig = ECDSA_SIG_new();
if (sig == NULL)
return NULL;
}
if (sig->r == NULL)
sig->r = BN_new();
if (sig->s == NULL)
sig->s = BN_new();
if (decode_der_dsa_sig(sig->r, sig->s, ppin, (size_t)len) == 0) {
if (psig == NULL || *psig == NULL)
ECDSA_SIG_free(sig);
return NULL;
}
if (psig != NULL && *psig == NULL)
*psig = sig;
return sig;
}
int i2d_ECDSA_SIG(const ECDSA_SIG *sig, unsigned char **ppout)
{
BUF_MEM *buf = NULL;
size_t encoded_len;
WPACKET pkt;
if (ppout == NULL) {
if (!WPACKET_init_null(&pkt, 0))
return -1;
} else if (*ppout == NULL) {
if ((buf = BUF_MEM_new()) == NULL
|| !WPACKET_init_len(&pkt, buf, 0)) {
BUF_MEM_free(buf);
return -1;
}
} else {
if (!WPACKET_init_static_len(&pkt, *ppout, SIZE_MAX, 0))
return -1;
}
if (!encode_der_dsa_sig(&pkt, sig->r, sig->s)
|| !WPACKET_get_total_written(&pkt, &encoded_len)
|| !WPACKET_finish(&pkt)) {
BUF_MEM_free(buf);
WPACKET_cleanup(&pkt);
return -1;
}
if (ppout != NULL) {
if (*ppout == NULL) {
*ppout = (unsigned char *)buf->data;
buf->data = NULL;
BUF_MEM_free(buf);
} else {
*ppout += encoded_len;
}
}
return (int)encoded_len;
}
void ECDSA_SIG_get0(const ECDSA_SIG *sig, const BIGNUM **pr, const BIGNUM **ps)
{
if (pr != NULL)
*pr = sig->r;
if (ps != NULL)
*ps = sig->s;
}
const BIGNUM *ECDSA_SIG_get0_r(const ECDSA_SIG *sig)
{
return sig->r;
}
const BIGNUM *ECDSA_SIG_get0_s(const ECDSA_SIG *sig)
{
return sig->s;
}
int ECDSA_SIG_set0(ECDSA_SIG *sig, BIGNUM *r, BIGNUM *s)
{
if (r == NULL || s == NULL)
return 0;
BN_clear_free(sig->r);
BN_clear_free(sig->s);
sig->r = r;
sig->s = s;
return 1;
}
#ifndef FIPS_MODE
int ECDSA_size(const EC_KEY *r)
{
int ret, i;
ASN1_INTEGER bs;
unsigned char buf[4];
const EC_GROUP *group;
if (r == NULL)
return 0;
group = EC_KEY_get0_group(r);
if (group == NULL)
return 0;
i = EC_GROUP_order_bits(group);
if (i == 0)
return 0;
bs.length = (i + 7) / 8;
bs.data = buf;
bs.type = V_ASN1_INTEGER;
/* If the top bit is set the asn1 encoding is 1 larger. */
buf[0] = 0xff;
i = i2d_ASN1_INTEGER(&bs, NULL);
i += i; /* r and s */
ret = ASN1_object_size(1, i, V_ASN1_SEQUENCE);
return ret;
}
#endif
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