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- /*
- This file is part of GNUnet.
- Copyright (C)
- 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
- */
- /**
- * @file rps/gnunet-service-rps_sampler_elem.h
- * @brief sampler element implementation
- * @author Julius Bünger
- */
- #ifndef RPS_SAMPLER_ELEM_H
- #define RPS_SAMPLER_ELEM_H
- #include <inttypes.h>
- /***********************************************************************
- * WARNING: This section needs to be reviewed regarding the use of
- * functions providing (pseudo)randomness!
- ***********************************************************************/
- /**
- * Used to indicate whether a sampler element is empty.
- */
- enum RPS_SamplerEmpty
- {
- NOT_EMPTY = 0x0,
- EMPTY = 0x1
- };
- /**
- * A sampler element sampling one PeerID at a time.
- */
- struct RPS_SamplerElement
- {
- /**
- * Min-wise linear permutation used by this sampler.
- *
- * This is an key later used by a hmac.
- */
- struct GNUNET_CRYPTO_AuthKey auth_key;
- /**
- * The PeerID this sampler currently samples.
- */
- struct GNUNET_PeerIdentity peer_id;
- /**
- * The according hash value of this PeerID.
- */
- struct GNUNET_HashCode peer_id_hash;
- /**
- * Time of last request.
- */
- struct GNUNET_TIME_Absolute last_client_request;
- /**
- * Flag that indicates that we are not holding a valid PeerID right now.
- */
- enum RPS_SamplerEmpty is_empty;
- /**
- * 'Birth'
- */
- struct GNUNET_TIME_Absolute birth;
- /**
- * How many times a PeerID was put in this sampler.
- */
- uint32_t num_peers;
- /**
- * How many times this sampler changed the peer_id.
- */
- uint32_t num_change;
- /**
- * The file name this sampler element should log to
- */
- char *file_name;
- };
- /**
- * Reinitialise a previously initialised sampler element.
- *
- * @param sampler_el The sampler element to (re-) initialise
- */
- void
- RPS_sampler_elem_reinit (struct RPS_SamplerElement *sampler_elem);
- /**
- * Create a sampler element and initialise it.
- *
- * In this implementation this means choosing an auth_key for later use in
- * a hmac at random.
- *
- * @return a newly created RPS_SamplerElement which currently holds no id.
- */
- struct RPS_SamplerElement *
- RPS_sampler_elem_create (void);
- /**
- * Destroy a sampler element.
- *
- * @param sampler_elem the element to destroy
- */
- void
- RPS_sampler_elem_destroy (struct RPS_SamplerElement *sampler_elem);
- /**
- * Update a sampler element with a PeerID
- *
- * @param sampler_elem The sampler element to update
- * @param new_ID The PeerID to update with
- */
- void
- RPS_sampler_elem_next (struct RPS_SamplerElement *sampler_elem,
- const struct GNUNET_PeerIdentity *new_ID);
- /**
- * Set the min-wise independent function of the given sampler element.
- *
- * @param sampler_elem the sampler element
- * @param auth_key the key to use
- */
- void
- RPS_sampler_elem_set (struct RPS_SamplerElement *sampler_elem,
- struct GNUNET_CRYPTO_AuthKey auth_key);
- #endif /* RPS_SAMPLER_ELEM_H */
- /* end of gnunet-service-rps.c */
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