ec_oct.c
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/*
* Copyright 2011-2018 The OpenSSL Project Authors. All Rights Reserved.
* Copyright (c) 2002, Oracle and/or its affiliates. All rights reserved
*
* Licensed under the OpenSSL license (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 <openssl/err.h>
#include <openssl/opensslv.h>
#include "ec_lcl.h"
int EC_POINT_set_compressed_coordinates(const EC_GROUP *group, EC_POINT *point,
const BIGNUM *x, int y_bit, BN_CTX *ctx)
{
if (group->meth->point_set_compressed_coordinates == NULL
&& !(group->meth->flags & EC_FLAGS_DEFAULT_OCT)) {
ECerr(EC_F_EC_POINT_SET_COMPRESSED_COORDINATES,
ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
return 0;
}
if (!ec_point_is_compat(point, group)) {
ECerr(EC_F_EC_POINT_SET_COMPRESSED_COORDINATES,
EC_R_INCOMPATIBLE_OBJECTS);
return 0;
}
if (group->meth->flags & EC_FLAGS_DEFAULT_OCT) {
if (group->meth->field_type == NID_X9_62_prime_field)
return ec_GFp_simple_set_compressed_coordinates(group, point, x,
y_bit, ctx);
else
#ifdef OPENSSL_NO_EC2M
{
ECerr(EC_F_EC_POINT_SET_COMPRESSED_COORDINATES,
EC_R_GF2M_NOT_SUPPORTED);
return 0;
}
#else
return ec_GF2m_simple_set_compressed_coordinates(group, point, x,
y_bit, ctx);
#endif
}
return group->meth->point_set_compressed_coordinates(group, point, x,
y_bit, ctx);
}
#if OPENSSL_API_COMPAT < 0x10200000L
int EC_POINT_set_compressed_coordinates_GFp(const EC_GROUP *group,
EC_POINT *point, const BIGNUM *x,
int y_bit, BN_CTX *ctx)
{
return EC_POINT_set_compressed_coordinates(group, point, x, y_bit, ctx);
}
# ifndef OPENSSL_NO_EC2M
int EC_POINT_set_compressed_coordinates_GF2m(const EC_GROUP *group,
EC_POINT *point, const BIGNUM *x,
int y_bit, BN_CTX *ctx)
{
return EC_POINT_set_compressed_coordinates(group, point, x, y_bit, ctx);
}
# endif
#endif
size_t EC_POINT_point2oct(const EC_GROUP *group, const EC_POINT *point,
point_conversion_form_t form, unsigned char *buf,
size_t len, BN_CTX *ctx)
{
if (group->meth->point2oct == 0
&& !(group->meth->flags & EC_FLAGS_DEFAULT_OCT)) {
ECerr(EC_F_EC_POINT_POINT2OCT, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
return 0;
}
if (!ec_point_is_compat(point, group)) {
ECerr(EC_F_EC_POINT_POINT2OCT, EC_R_INCOMPATIBLE_OBJECTS);
return 0;
}
if (group->meth->flags & EC_FLAGS_DEFAULT_OCT) {
if (group->meth->field_type == NID_X9_62_prime_field)
return ec_GFp_simple_point2oct(group, point, form, buf, len, ctx);
else
#ifdef OPENSSL_NO_EC2M
{
ECerr(EC_F_EC_POINT_POINT2OCT, EC_R_GF2M_NOT_SUPPORTED);
return 0;
}
#else
return ec_GF2m_simple_point2oct(group, point,
form, buf, len, ctx);
#endif
}
return group->meth->point2oct(group, point, form, buf, len, ctx);
}
int EC_POINT_oct2point(const EC_GROUP *group, EC_POINT *point,
const unsigned char *buf, size_t len, BN_CTX *ctx)
{
if (group->meth->oct2point == 0
&& !(group->meth->flags & EC_FLAGS_DEFAULT_OCT)) {
ECerr(EC_F_EC_POINT_OCT2POINT, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
return 0;
}
if (!ec_point_is_compat(point, group)) {
ECerr(EC_F_EC_POINT_OCT2POINT, EC_R_INCOMPATIBLE_OBJECTS);
return 0;
}
if (group->meth->flags & EC_FLAGS_DEFAULT_OCT) {
if (group->meth->field_type == NID_X9_62_prime_field)
return ec_GFp_simple_oct2point(group, point, buf, len, ctx);
else
#ifdef OPENSSL_NO_EC2M
{
ECerr(EC_F_EC_POINT_OCT2POINT, EC_R_GF2M_NOT_SUPPORTED);
return 0;
}
#else
return ec_GF2m_simple_oct2point(group, point, buf, len, ctx);
#endif
}
return group->meth->oct2point(group, point, buf, len, ctx);
}
size_t EC_POINT_point2buf(const EC_GROUP *group, const EC_POINT *point,
point_conversion_form_t form,
unsigned char **pbuf, BN_CTX *ctx)
{
size_t len;
unsigned char *buf;
len = EC_POINT_point2oct(group, point, form, NULL, 0, NULL);
if (len == 0)
return 0;
if ((buf = OPENSSL_malloc(len)) == NULL) {
ECerr(EC_F_EC_POINT_POINT2BUF, ERR_R_MALLOC_FAILURE);
return 0;
}
len = EC_POINT_point2oct(group, point, form, buf, len, ctx);
if (len == 0) {
OPENSSL_free(buf);
return 0;
}
*pbuf = buf;
return len;
}