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/*
This file is part of GNUnet.
Copyright (C) 2021 GNUnet e.V.
GNUnet is free software: you can redistribute it and/or modify it
under the terms of the GNU Affero General Public License as published
by the Free Software Foundation, either version 3 of the License,
or (at your option) any later version.
GNUnet is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
SPDX-License-Identifier: AGPL3.0-or-later
*/
/*
* @author Tobias Frisch
* @file gnunet_chat_util.c
*/
#include "gnunet_chat_util.h"
void
util_shorthash_from_member (const struct GNUNET_MESSENGER_Contact *member,
struct GNUNET_ShortHashCode *shorthash)
{
memset(shorthash, 0, sizeof(*shorthash));
GNUNET_memcpy(shorthash, &member, sizeof(member));
}
void
util_set_name_field (const char *name, char **field)
{
if (*field)
GNUNET_free(*field);
if (name)
*field = GNUNET_strdup(name);
else
*field = NULL;
}
int
util_hash_file (const char *filename, struct GNUNET_HashCode *hash)
{
uint64_t size;
if (GNUNET_OK != GNUNET_DISK_file_size(filename, &size, GNUNET_NO, GNUNET_YES))
return GNUNET_SYSERR;
struct GNUNET_DISK_FileHandle *file = GNUNET_DISK_file_open(
filename, GNUNET_DISK_OPEN_READ, GNUNET_DISK_PERM_USER_READ
);
if (!file)
return GNUNET_SYSERR;
struct GNUNET_DISK_MapHandle *mapping;
const void* data = GNUNET_DISK_file_map(
file, &mapping, GNUNET_DISK_MAP_TYPE_READ, size
);
if (!data)
{
GNUNET_DISK_file_close(file);
return GNUNET_SYSERR;
}
GNUNET_CRYPTO_hash(data, size, hash);
GNUNET_DISK_file_unmap(mapping);
GNUNET_DISK_file_close(file);
return GNUNET_OK;
}
int
util_encrypt_file (const char *filename,
const struct GNUNET_CRYPTO_SymmetricSessionKey *key)
{
uint64_t size;
if (GNUNET_OK != GNUNET_DISK_file_size(filename, &size, GNUNET_NO, GNUNET_YES))
return GNUNET_SYSERR;
struct GNUNET_DISK_FileHandle *file = GNUNET_DISK_file_open(
filename, GNUNET_DISK_OPEN_READWRITE,
GNUNET_DISK_PERM_USER_READ | GNUNET_DISK_PERM_USER_WRITE
);
if (!file)
return GNUNET_SYSERR;
struct GNUNET_DISK_MapHandle *mapping;
void* data = GNUNET_DISK_file_map(
file, &mapping, GNUNET_DISK_MAP_TYPE_READWRITE, size
);
if (!data)
{
GNUNET_DISK_file_close(file);
return GNUNET_SYSERR;
}
struct GNUNET_CRYPTO_SymmetricInitializationVector iv;
memset(&iv, 0, sizeof(iv));
ssize_t result = GNUNET_CRYPTO_symmetric_encrypt(data, size, key, &iv, data);
if (GNUNET_OK != GNUNET_DISK_file_unmap(mapping))
result = -1;
if (GNUNET_OK != GNUNET_DISK_file_sync(file))
result = -1;
if (GNUNET_OK != GNUNET_DISK_file_close(file))
result = -1;
if (result < 0)
return GNUNET_SYSERR;
return GNUNET_OK;
}
int
util_decrypt_file (const char *filename,
const struct GNUNET_CRYPTO_SymmetricSessionKey *key)
{
uint64_t size;
if (GNUNET_OK != GNUNET_DISK_file_size(filename, &size, GNUNET_NO, GNUNET_YES))
return GNUNET_SYSERR;
struct GNUNET_DISK_FileHandle *file = GNUNET_DISK_file_open(
filename, GNUNET_DISK_OPEN_READWRITE,
GNUNET_DISK_PERM_USER_READ | GNUNET_DISK_PERM_USER_WRITE
);
if (!file)
return GNUNET_SYSERR;
struct GNUNET_DISK_MapHandle *mapping;
void* data = GNUNET_DISK_file_map(
file, &mapping, GNUNET_DISK_MAP_TYPE_READWRITE, size
);
if (!data)
{
GNUNET_DISK_file_close(file);
return GNUNET_SYSERR;
}
struct GNUNET_CRYPTO_SymmetricInitializationVector iv;
memset(&iv, 0, sizeof(iv));
ssize_t result = GNUNET_CRYPTO_symmetric_decrypt(data, size, key, &iv, data);
if (GNUNET_OK != GNUNET_DISK_file_unmap(mapping))
result = -1;
if (GNUNET_OK != GNUNET_DISK_file_sync(file))
result = -1;
if (GNUNET_OK != GNUNET_DISK_file_close(file))
result = -1;
if (result < 0)
return GNUNET_SYSERR;
return GNUNET_OK;
}
int
util_get_filename (const char *directory, const char *subdir,
const struct GNUNET_HashCode *hash,
char **filename)
{
return GNUNET_asprintf (
filename,
"%s%s%c%s",
directory,
subdir,
DIR_SEPARATOR,
GNUNET_h2s_full(hash)
);
}
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