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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/>.
- SPDX-License-Identifier: AGPL3.0-or-later
- */
- /**
- * @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;
- /**
- * Minimum 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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