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/*
This file is part of GNUnet.
Copyright (C) 2001-2018 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/>.
*/
/**
* @file include/gnunet_abe_lib.h
* @brief Attribute-Based Encryption primitives for GNUnet
*
* @author Martin Schanzenbach
*
* @defgroup abe ABE Crypto library: Attribute-Based Encryption operations
*
*/
#ifndef GNUNET_ABE_LIB_H
#define GNUNET_ABE_LIB_H
#ifdef __cplusplus
extern "C"
{
#if 0 /* keep Emacsens' auto-indent happy */
}
#endif
#endif
#include "gnunet_common.h"
#include <gcrypt.h>
/**
* @brief type for ABE master keys
*/
struct GNUNET_CRYPTO_AbeMasterKey;
/**
* @brief type for ABE keys
*/
struct GNUNET_CRYPTO_AbeKey;
/**
* @ingroup abe
* Create a new CP-ABE master key. Caller must free return value.
*
* @return fresh private key; free using #GNUNET_ABE_cpabe_delete_master_key
*/
struct GNUNET_ABE_AbeMasterKey *
GNUNET_ABE_cpabe_create_master_key (void);
/**
* @ingroup abe
* Delete a CP-ABE master key.
*
* @param key the master key
* @return fresh private key; free using #GNUNET_free
*/
void
GNUNET_ABE_cpabe_delete_master_key (struct GNUNET_ABE_AbeMasterKey *key);
/**
* @ingroup abe
* Create a new CP-ABE key. Caller must free return value.
*
* @param key the master key
* @param attrs the attributes to append to the key
* @return fresh private key; free using #GNUNET_ABE_cpabe_delete_key
*/
struct GNUNET_ABE_AbeKey *
GNUNET_ABE_cpabe_create_key (struct GNUNET_ABE_AbeMasterKey *key,
char **attrs);
/**
* @ingroup abe
* Delete a CP-ABE key.
*
* @param key the key to delete
* @param delete_pub GNUNE_YES if the public key should also be freed (bug in gabe)
* @return fresh private key; free using #GNUNET_free
*/
void
GNUNET_ABE_cpabe_delete_key (struct GNUNET_ABE_AbeKey *key,
int delete_pub);
/**
* @ingroup abe
* Encrypt a block using sessionkey.
*
* @param block the block to encrypt
* @param size the size of the @a block
* @param policy the ABE policy
* @param key the key used to encrypt
* @param result the result buffer. Will be allocated. Free using #GNUNET_free
* @return the size of the encrypted block, -1 for errors
*/
ssize_t
GNUNET_ABE_cpabe_encrypt (const void *block,
size_t size,
const char *policy,
const struct GNUNET_ABE_AbeMasterKey *key,
void **result);
/**
* @ingroup abe
* Decrypt a block using the ABE key.
*
* @param block the block to encrypt
* @param size the size of the @a block
* @param key the key used to decrypt
* @param result the result buffer. Will be allocated. Free using #GNUNET_free
* @return the size of the encrypted block, -1 for errors
*/
ssize_t
GNUNET_ABE_cpabe_decrypt (const void *block,
size_t size,
const struct GNUNET_ABE_AbeKey *key,
void **result);
/**
* @ingroup abe
* Serialize an ABE key.
*
* @param key the key to serialize
* @param result the result buffer. Will be allocated. Free using #GNUNET_free
* @return the size of the encrypted block, -1 for errors
*/
ssize_t
GNUNET_ABE_cpabe_serialize_key (const struct GNUNET_ABE_AbeKey *key,
void **result);
/**
* @ingroup abe
* Deserialize a serialized ABE key.
*
* @param data the data to deserialize
* @param len the length of the data.
* @return the ABE key. NULL of unsuccessful
*/
struct GNUNET_ABE_AbeKey*
GNUNET_ABE_cpabe_deserialize_key (const void *data,
size_t len);
/**
* @ingroup abe
* Serialize an ABE master key.
*
* @param key the key to serialize
* @param result the result buffer. Will be allocated. Free using #GNUNET_free
* @return the size of the encrypted block, -1 for errors
*/
ssize_t
GNUNET_ABE_cpabe_serialize_master_key (const struct GNUNET_ABE_AbeMasterKey *key,
void **result);
/**
* @ingroup abe
* Deserialize an ABE master key.
*
* @param data the data to deserialize
* @param len the length of the data.
* @return the ABE key. NULL of unsuccessful
*/
struct GNUNET_ABE_AbeMasterKey*
GNUNET_ABE_cpabe_deserialize_master_key (const void *data,
size_t len);
#if 0 /* keep Emacsens' auto-indent happy */
{
#endif
#ifdef __cplusplus
}
#endif
/* ifndef GNUNET_ABE_LIB_H */
#endif
/* end of gnunet_abe_lib.h */
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