/*
* Copyright 2020-2022 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
*/
/*
* Low level APIs related to EC_KEY are deprecated for public use,
* but still ok for internal use.
*/
#include "internal/deprecated.h"
#include <openssl/core_names.h>
#include <openssl/objects.h>
#include <openssl/params.h>
#include <openssl/err.h>
#ifndef FIPS_MODULE
# include <openssl/engine.h>
# include <openssl/x509.h>
#endif
#include "crypto/bn.h"
#include "crypto/ec.h"
#include "ec_local.h"
#include "internal/e_os.h"
#include "internal/nelem.h"
#include "internal/param_build_set.h"
/* Mapping between a flag and a name */
static const OSSL_ITEM encoding_nameid_map[] = {
{ OPENSSL_EC_EXPLICIT_CURVE, OSSL_PKEY_EC_ENCODING_EXPLICIT },
{ OPENSSL_EC_NAMED_CURVE, OSSL_PKEY_EC_ENCODING_GROUP },
};
static const OSSL_ITEM check_group_type_nameid_map[] = {
{ 0, OSSL_PKEY_EC_GROUP_CHECK_DEFAULT },
{ EC_FLAG_CHECK_NAMED_GROUP, OSSL_PKEY_EC_GROUP_CHECK_NAMED },
{ EC_FLAG_CHECK_NAMED_GROUP_NIST, OSSL_PKEY_EC_GROUP_CHECK_NAMED_NIST },
};
static const OSSL_ITEM format_nameid_map[] = {
{ (int)POINT_CONVERSION_UNCOMPRESSED, OSSL_PKEY_EC_POINT_CONVERSION_FORMAT_UNCOMPRESSED },
{ (int)POINT_CONVERSION_COMPRESSED, OSSL_PKEY_EC_POINT_CONVERSION_FORMAT_COMPRESSED },
{ (int)POINT_CONVERSION_HYBRID, OSSL_PKEY_EC_POINT_CONVERSION_FORMAT_HYBRID },
};
int ossl_ec_encoding_name2id(const char *name)
{
size_t i, sz;
/* Return the default value if there is no name */
if (name == NULL)
return OPENSSL_EC_NAMED_CURVE;
for (i = 0, sz = OSSL_NELEM(encoding_nameid_map); i < sz; i++) {
if (OPENSSL_strcasecmp(name, encoding_nameid_map[i].ptr) == 0)
return encoding_nameid_map[i].id;
}
return -1;
}
static char *ec_param_encoding_id2name(int id)
{
size_t i, sz;
for (i = 0, sz = OSSL_NELEM(encoding_nameid_map); i < sz; i++) {
if (id == (int)encoding_nameid_map[i].id)
return encoding_nameid_map[i].ptr;
}
return NULL;
}
char *ossl_ec_check_group_type_id2name(int id)
{
size_t i, sz;
for (i = 0, sz = OSSL_NELEM(check_group_type_nameid_map); i < sz; i++) {
if (id == (int)check_group_type_nameid_map[i].id)
return check_group_type_nameid_map[i].ptr;
}
return NULL;
}
static int ec_check_group_type_name2id(const char *name)
{
size_t i, sz;
/* Return the default value if there is no name */
if (name == NULL)
return 0;
for (i = 0, sz = OSSL_NELEM(check_group_type_nameid_map); i < sz; i++) {
if (OPENSSL_strcasecmp(name, check_group_type_nameid_map[i].ptr) == 0)
return check_group_type_nameid_map[i].id;
}
return -1;
}
int ossl_ec_set_check_group_type_from_name(EC_KEY *ec, const char *name)
{
int flags = ec_check_group_type_name2id(name);
if (flags == -1)
return 0;
EC_KEY_clear_flags(ec, EC_FLAG_CHECK_NAMED_GROUP_MASK);
EC_KEY_set_flags(ec, flags);
return 1;
}
static int ec_set_check_group_type_from_param(EC_KEY *ec, const OSSL_PARAM *p)
{
const char *name = NULL;
int status = 0;
switch (p->data_type) {
case OSSL_PARAM_UTF8_STRING:
name = p->data;
status = (name != NULL);
break;
case OSSL_PARAM_UTF8_PTR:
status = OSSL_PARAM_get_utf8_ptr(p, &name);
break;
}
if (status)
return ossl_ec_set_check_group_type_from_name(ec, name);
return 0;
}
int ossl_ec_pt_format_name2id(const char *name)
{
size_t i, sz;
/* Return the default value if there is no name */
if (name == NULL)
return (int)POINT_CONVERSION_UNCOMPRESSED;
for (i = 0, sz = OSSL_NELEM(format_nameid_map); i < sz; i++) {
if (OPENSSL_strcasecmp(name, format_nameid_map[i].ptr) == 0)
return format_nameid_map[i].id;
}
return -1;
}
char *ossl_ec_pt_format_id2name(int id)
{
size_t i, sz;
for (i = 0, sz = OSSL_NELEM(format_nameid_map); i < sz; i++) {
if (id == (int)format_nameid_map[i].id)
return format_nameid_map[i].ptr;
}
return NULL