2 This file is part of GNUnet.
3 Copyright (C) 2013 GNUnet e.V.
5 GNUnet is free software: you can redistribute it and/or modify it
6 under the terms of the GNU Affero General Public License as published
7 by the Free Software Foundation, either version 3 of the License,
8 or (at your option) any later version.
10 GNUnet is distributed in the hope that it will be useful, but
11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Affero General Public License for more details.
15 You should have received a copy of the GNU Affero General Public License
16 along with this program. If not, see <http://www.gnu.org/licenses/>.
18 SPDX-License-Identifier: AGPL3.0-or-later
22 * @author Florian Dold
23 * @file secretsharing/secretsharing.h
24 * @brief messages used for the secretsharing api
26 #ifndef SECRETSHARING_H
27 #define SECRETSHARING_H
30 #include "gnunet_util_lib.h"
31 #include "gnunet_time_lib.h"
32 #include "gnunet_common.h"
33 #include "gnunet_secretsharing_service.h"
36 GNUNET_NETWORK_STRUCT_BEGIN
38 struct GNUNET_SECRETSHARING_FieldElement {
40 * Value of an element in <elgamal_g>.
42 unsigned char bits[GNUNET_SECRETSHARING_ELGAMAL_BITS / 8];
46 struct GNUNET_SECRETSHARING_CreateMessage {
48 * Type: GNUNET_MESSAGE_TYPE_SECRETSHARING_CLIENT_GENERATE
50 struct GNUNET_MessageHeader header;
53 * Session ID, will be used for consensus.
55 struct GNUNET_HashCode session_id GNUNET_PACKED;
58 * Start time for communication with the other peers.
60 struct GNUNET_TIME_AbsoluteNBO start;
63 * Deadline for the establishment of the crypto system.
65 struct GNUNET_TIME_AbsoluteNBO deadline;
68 * Mininum number of cooperating peers to decrypt a
71 uint16_t threshold GNUNET_PACKED;
74 * Number of peers at the end of this message.
76 uint16_t num_peers GNUNET_PACKED;
78 /* struct GNUNET_PeerIdentity[num_peers]; */
83 struct GNUNET_SECRETSHARING_ShareHeaderNBO {
85 * Threshold for the key this share belongs to.
90 * Peers that have the share.
95 * Index of our peer in the list.
100 * Public key. Must correspond to the product of
101 * the homomorphic share commitments.
103 struct GNUNET_SECRETSHARING_PublicKey public_key;
108 struct GNUNET_SECRETSHARING_FieldElement my_share;
113 * Notify the client that then threshold secret has been
116 struct GNUNET_SECRETSHARING_SecretReadyMessage {
118 * Type: GNUNET_MESSAGE_TYPE_SECRETSHARING_CLIENT_SECRET_READY
120 struct GNUNET_MessageHeader header;
122 /* rest: the serialized share */
126 struct GNUNET_SECRETSHARING_DecryptRequestMessage {
128 * Type: GNUNET_MESSAGE_TYPE_SECRETSHARING_CLIENT_DECRYPT_REQUEST
130 struct GNUNET_MessageHeader header;
133 * Until when should the decryption start?
135 struct GNUNET_TIME_AbsoluteNBO start;
138 * Until when should the decryption be finished?
140 struct GNUNET_TIME_AbsoluteNBO deadline;
143 * Ciphertext we want to decrypt.
145 struct GNUNET_SECRETSHARING_Ciphertext ciphertext;
147 /* the share with payload */
151 struct GNUNET_SECRETSHARING_DecryptResponseMessage {
153 * Type: #GNUNET_MESSAGE_TYPE_SECRETSHARING_CLIENT_DECRYPT_DONE
155 struct GNUNET_MessageHeader header;
158 * Zero if decryption failed, non-zero if decryption succeeded.
159 * If the decryption failed, plaintext is also zero.
161 uint32_t success GNUNET_PACKED;
164 * Decrypted plaintext.
166 struct GNUNET_SECRETSHARING_FieldElement plaintext;
170 GNUNET_NETWORK_STRUCT_END
174 * A share, with all values in in host byte order.
176 struct GNUNET_SECRETSHARING_Share {
178 * Threshold for the key this share belongs to.
183 * Peers that have the share.
188 * Index of our peer in the list.
193 * Public key. Computed from the
194 * exponentiated coefficients.
196 struct GNUNET_SECRETSHARING_PublicKey public_key;
201 struct GNUNET_SECRETSHARING_FieldElement my_share;
204 * Peer identities (includes 'my_peer')
206 struct GNUNET_PeerIdentity *peers;
209 * For each peer, store elgamal_g to the peer's
212 struct GNUNET_SECRETSHARING_FieldElement *sigmas;
215 * Original indices of peers from the DKG round.
217 uint16_t *original_indices;