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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
41 * Value of an element in <elgamal_g>.
43 unsigned char bits[GNUNET_SECRETSHARING_ELGAMAL_BITS / 8];
47 struct GNUNET_SECRETSHARING_CreateMessage
50 * Type: GNUNET_MESSAGE_TYPE_SECRETSHARING_CLIENT_GENERATE
52 struct GNUNET_MessageHeader header;
55 * Session ID, will be used for consensus.
57 struct GNUNET_HashCode session_id GNUNET_PACKED;
60 * Start time for communication with the other peers.
62 struct GNUNET_TIME_AbsoluteNBO start;
65 * Deadline for the establishment of the crypto system.
67 struct GNUNET_TIME_AbsoluteNBO deadline;
70 * Mininum number of cooperating peers to decrypt a
73 uint16_t threshold GNUNET_PACKED;
76 * Number of peers at the end of this message.
78 uint16_t num_peers GNUNET_PACKED;
80 /* struct GNUNET_PeerIdentity[num_peers]; */
85 struct GNUNET_SECRETSHARING_ShareHeaderNBO
88 * Threshold for the key this share belongs to.
93 * Peers that have the share.
98 * Index of our peer in the list.
103 * Public key. Must correspond to the product of
104 * the homomorphic share commitments.
106 struct GNUNET_SECRETSHARING_PublicKey public_key;
111 struct GNUNET_SECRETSHARING_FieldElement my_share;
116 * Notify the client that then threshold secret has been
119 struct GNUNET_SECRETSHARING_SecretReadyMessage
122 * Type: GNUNET_MESSAGE_TYPE_SECRETSHARING_CLIENT_SECRET_READY
124 struct GNUNET_MessageHeader header;
126 /* rest: the serialized share */
131 struct GNUNET_SECRETSHARING_DecryptRequestMessage
134 * Type: GNUNET_MESSAGE_TYPE_SECRETSHARING_CLIENT_DECRYPT_REQUEST
136 struct GNUNET_MessageHeader header;
139 * Until when should the decryption start?
141 struct GNUNET_TIME_AbsoluteNBO start;
144 * Until when should the decryption be finished?
146 struct GNUNET_TIME_AbsoluteNBO deadline;
149 * Ciphertext we want to decrypt.
151 struct GNUNET_SECRETSHARING_Ciphertext ciphertext;
153 /* the share with payload */
157 struct GNUNET_SECRETSHARING_DecryptResponseMessage
160 * Type: #GNUNET_MESSAGE_TYPE_SECRETSHARING_CLIENT_DECRYPT_DONE
162 struct GNUNET_MessageHeader header;
165 * Zero if decryption failed, non-zero if decryption succeeded.
166 * If the decryption failed, plaintext is also zero.
168 uint32_t success GNUNET_PACKED;
171 * Decrypted plaintext.
173 struct GNUNET_SECRETSHARING_FieldElement plaintext;
177 GNUNET_NETWORK_STRUCT_END
181 * A share, with all values in in host byte order.
183 struct GNUNET_SECRETSHARING_Share
186 * Threshold for the key this share belongs to.
191 * Peers that have the share.
196 * Index of our peer in the list.
201 * Public key. Computed from the
202 * exponentiated coefficients.
204 struct GNUNET_SECRETSHARING_PublicKey public_key;
209 struct GNUNET_SECRETSHARING_FieldElement my_share;
212 * Peer identities (includes 'my_peer')
214 struct GNUNET_PeerIdentity *peers;
217 * For each peer, store elgamal_g to the peer's
220 struct GNUNET_SECRETSHARING_FieldElement *sigmas;
223 * Original indices of peers from the DKG round.
225 uint16_t *original_indices;