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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/>.
*/
/**
* @author Florian Dold
* @file secretsharing/secretsharing.h
* @brief messages used for the secretsharing api
*/
#ifndef SECRETSHARING_H
#define SECRETSHARING_H
#include "platform.h"
#include "gnunet_util_lib.h"
#include "gnunet_time_lib.h"
#include "gnunet_common.h"
#include "gnunet_secretsharing_service.h"
GNUNET_NETWORK_STRUCT_BEGIN
struct GNUNET_SECRETSHARING_FieldElement
{
/**
* Value of an element in <elgamal_g>.
*/
unsigned char bits[GNUNET_SECRETSHARING_ELGAMAL_BITS / 8];
};
struct GNUNET_SECRETSHARING_CreateMessage
{
/**
* Type: GNUNET_MESSAGE_TYPE_SECRETSHARING_CLIENT_GENERATE
*/
struct GNUNET_MessageHeader header;
/**
* Session ID, will be used for consensus.
*/
struct GNUNET_HashCode session_id GNUNET_PACKED;
/**
* Start time for communication with the other peers.
*/
struct GNUNET_TIME_AbsoluteNBO start;
/**
* Deadline for the establishment of the crypto system.
*/
struct GNUNET_TIME_AbsoluteNBO deadline;
/**
* Mininum number of cooperating peers to decrypt a
* value.
*/
uint16_t threshold GNUNET_PACKED;
/**
* Number of peers at the end of this message.
*/
uint16_t num_peers GNUNET_PACKED;
/* struct GNUNET_PeerIdentity[num_peers]; */
};
struct GNUNET_SECRETSHARING_ShareHeaderNBO
{
/**
* Threshold for the key this share belongs to.
*/
uint16_t threshold;
/**
* Peers that have the share.
*/
uint16_t num_peers;
/**
* Index of our peer in the list.
*/
uint16_t my_peer;
/**
* Public key. Must correspond to the product of
* the homomorphic share commitments.
*/
struct GNUNET_SECRETSHARING_PublicKey public_key;
/**
* Share of 'my_peer'
*/
struct GNUNET_SECRETSHARING_FieldElement my_share;
};
/**
* Notify the client that then threshold secret has been
* established.
*/
struct GNUNET_SECRETSHARING_SecretReadyMessage
{
/**
* Type: GNUNET_MESSAGE_TYPE_SECRETSHARING_CLIENT_SECRET_READY
*/
struct GNUNET_MessageHeader header;
/* rest: the serialized share */
};
struct GNUNET_SECRETSHARING_DecryptRequestMessage
{
/**
* Type: GNUNET_MESSAGE_TYPE_SECRETSHARING_CLIENT_DECRYPT_REQUEST
*/
struct GNUNET_MessageHeader header;
/**
* Until when should the decryption start?
*/
struct GNUNET_TIME_AbsoluteNBO start;
/**
* Until when should the decryption be finished?
*/
struct GNUNET_TIME_AbsoluteNBO deadline;
/**
* Ciphertext we want to decrypt.
*/
struct GNUNET_SECRETSHARING_Ciphertext ciphertext;
/* the share with payload */
};
struct GNUNET_SECRETSHARING_DecryptResponseMessage
{
/**
* Type: #GNUNET_MESSAGE_TYPE_SECRETSHARING_CLIENT_DECRYPT_DONE
*/
struct GNUNET_MessageHeader header;
/**
* Zero if decryption failed, non-zero if decryption succeeded.
* If the decryption failed, plaintext is also zero.
*/
uint32_t success GNUNET_PACKED;
/**
* Decrypted plaintext.
*/
struct GNUNET_SECRETSHARING_FieldElement plaintext;
};
GNUNET_NETWORK_STRUCT_END
/**
* A share, with all values in in host byte order.
*/
struct GNUNET_SECRETSHARING_Share
{
/**
* Threshold for the key this share belongs to.
*/
uint16_t threshold;
/**
* Peers that have the share.
*/
uint16_t num_peers;
/**
* Index of our peer in the list.
*/
uint16_t my_peer;
/**
* Public key. Computed from the
* exponentiated coefficients.
*/
struct GNUNET_SECRETSHARING_PublicKey public_key;
/**
* Share of 'my_peer'
*/
struct GNUNET_SECRETSHARING_FieldElement my_share;
/**
* Peer identities (includes 'my_peer')
*/
struct GNUNET_PeerIdentity *peers;
/*
* For each peer, store elgamal_g to the peer's
* share.
*/
struct GNUNET_SECRETSHARING_FieldElement *sigmas;
/*
* Original indices of peers from the DKG round.
*/
uint16_t *original_indices;
};
#endif
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