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/*
This file is part of GNUnet
Copyright (C) 2013 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/>.
*/
#ifndef GNUNET_REVOCATION_SERVICE_H_
#define GNUNET_REVOCATION_SERVICE_H_
/**
* @author Christian Grothoff
*
* @file
* API to perform and access key revocations
*
* @defgroup revocation Revocation service
* Perform and access key revocations.
*
* @see [Documentation](https://gnunet.org/revocation-subsystem)
*
* @{
*/
#ifdef __cplusplus
extern "C"
{
#if 0 /* keep Emacsens' auto-indent happy */
}
#endif
#endif
#include "gnunet_util_lib.h"
/**
* Version of the key revocation API.
*/
#define GNUNET_REVOCATION_VERSION 0x00000000
/**
* Handle for the key revocation query.
*/
struct GNUNET_REVOCATION_Query;
/**
* Callback to call with the result of a key revocation query.
*
* @param cls closure
* @param is_valid #GNUNET_NO of the key is/was revoked,
* #GNUNET_YES if the key is still valid,
* #GNUNET_SYSERR if we had trouble querying the service
*
*/
typedef void (*GNUNET_REVOCATION_Callback) (void *cls,
int is_valid);
/**
* Check if a key was revoked.
*
* @param cfg the configuration to use
* @param key key to check for revocation
* @param func funtion to call with the result of the check
* @param func_cls closure to pass to @a func
* @return handle to use in #GNUNET_REVOCATION_query_cancel to stop REVOCATION from invoking the callback
*/
struct GNUNET_REVOCATION_Query *
GNUNET_REVOCATION_query (const struct GNUNET_CONFIGURATION_Handle *cfg,
const struct GNUNET_CRYPTO_EcdsaPublicKey *key,
GNUNET_REVOCATION_Callback func, void *func_cls);
/**
* Cancel key revocation check.
*
* @param q query to cancel
*/
void
GNUNET_REVOCATION_query_cancel (struct GNUNET_REVOCATION_Query *q);
/**
* Handle for the key revocation operation.
*/
struct GNUNET_REVOCATION_Handle;
/**
* Perform key revocation.
*
* @param cfg the configuration to use
* @param key public key of the key to revoke
* @param sig signature to use on the revocation (should have been
* created using #GNUNET_REVOCATION_sign_revocation).
* @param pow proof of work to use (should have been created by
* iteratively calling #GNUNET_REVOCATION_check_pow)
* @param func funtion to call with the result of the check
* (called with `is_valid` being #GNUNET_NO if
* the revocation worked).
* @param func_cls closure to pass to @a func
* @return handle to use in #GNUNET_REVOCATION_revoke_cancel to stop REVOCATION from invoking the callback
*/
struct GNUNET_REVOCATION_Handle *
GNUNET_REVOCATION_revoke (const struct GNUNET_CONFIGURATION_Handle *cfg,
const struct GNUNET_CRYPTO_EcdsaPublicKey *key,
const struct GNUNET_CRYPTO_EcdsaSignature *sig,
uint64_t pow,
GNUNET_REVOCATION_Callback func, void *func_cls);
/**
* Cancel key revocation.
*
* @param h operation to cancel
*/
void
GNUNET_REVOCATION_revoke_cancel (struct GNUNET_REVOCATION_Handle *h);
/**
* Check if the given proof-of-work value
* would be acceptable for revoking the given key.
*
* @param key key to check for
* @param pow proof of work value
* @param matching_bits how many bits must match (configuration)
* @return #GNUNET_YES if the @a pow is acceptable, #GNUNET_NO if not
*/
int
GNUNET_REVOCATION_check_pow (const struct GNUNET_CRYPTO_EcdsaPublicKey *key,
uint64_t pow,
unsigned int matching_bits);
/**
* Create a revocation signature.
*
* @param key private key of the key to revoke
* @param sig where to write the revocation signature
*/
void
GNUNET_REVOCATION_sign_revocation (const struct GNUNET_CRYPTO_EcdsaPrivateKey *key,
struct GNUNET_CRYPTO_EcdsaSignature *sig);
#if 0 /* keep Emacsens' auto-indent happy */
{
#endif
#ifdef __cplusplus
}
#endif
#endif /* GNUNET_REVOCATION_SERVICE_H_ */
/** @} */ /* end of group revocation */
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