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22 * @file scalarproduct.h
23 * @brief Scalar Product Message Types
24 * @author Christian M. Fuchs
26 * Created on September 2, 2013, 3:43 PM
29 #ifndef SCALARPRODUCT_H
30 #define SCALARPRODUCT_H
36 ///////////////////////////////////////////////////////////////////////////////
38 ///////////////////////////////////////////////////////////////////////////////
40 * Length of the key used for encryption
45 * When performing our crypto, we may add two encrypted values with each
46 * a maximal length of GNUNET_CRYPTO_RSA_DATA_ENCODING_LENGTH.
48 #define PAILLIER_ELEMENT_LENGTH (2*KEYBITS/sizeof(char))
51 * Maximum count of elements we can put into a multipart message
53 #define MULTIPART_ELEMENT_CAPACITY ((GNUNET_SERVER_MAX_MESSAGE_SIZE - 1 - sizeof (struct GNUNET_SCALARPRODUCT_multipart_message)) / PAILLIER_ELEMENT_LENGTH)
56 * Log an error message at log-level 'level' that indicates
57 * a failure of the command 'cmd' with the message given
58 * by gcry_strerror(rc).
60 #define LOG_GCRY(level, cmd, rc) do { LOG(level, _("`%s' failed at %s:%d with error: %s\n"), cmd, __FILE__, __LINE__, gcry_strerror(rc)); } while(0)
62 ///////////////////////////////////////////////////////////////////////////////
63 // Scalar Product Message Types
64 ///////////////////////////////////////////////////////////////////////////////
67 * Message type passed from client to service
68 * to initiate a request or responder role
70 struct GNUNET_SCALARPRODUCT_client_request
73 * GNUNET message header
75 struct GNUNET_MessageHeader header;
78 * how many elements the vector in payload contains
80 uint32_t element_count GNUNET_PACKED;
83 * how many bytes the mask has
85 uint32_t mask_length GNUNET_PACKED;
88 * the transaction/session key used to identify a session
90 struct GNUNET_HashCode key;
93 * the identity of a remote peer we want to communicate with
95 struct GNUNET_PeerIdentity peer;
98 * followed by long vector[element_count] | [unsigned char mask[mask_bytes]]
103 * Message type passed from requesting service Alice to responding service Bob
104 * to initiate a request and make bob participate in our protocol
106 struct GNUNET_SCALARPRODUCT_service_request {
108 * GNUNET message header
110 struct GNUNET_MessageHeader header;
113 * how many elements the total message including all multipart msgs contains
115 uint32_t total_element_count GNUNET_PACKED;
118 * how many elements are actually included after the mask was applied.
120 uint32_t contained_element_count GNUNET_PACKED;
123 * how many bytes the mask has
125 uint32_t mask_length GNUNET_PACKED;
128 * the length of the publickey contained within this message
130 uint32_t pk_length GNUNET_PACKED;
133 * the transaction/session key used to identify a session
135 struct GNUNET_HashCode key;
138 * how many elements the vector in payload contains
140 uint32_t element_count GNUNET_PACKED;
143 * followed by mask | public_key | vector[used_element_count]
148 * Multipart Message type passed between to supply additional elements for the peer
150 struct GNUNET_SCALARPRODUCT_multipart_message {
152 * GNUNET message header
154 struct GNUNET_MessageHeader header;
157 * how many elements we supply within this message
159 uint32_t multipart_element_count GNUNET_PACKED;
161 // followed by vector[multipart_element_count] or k[i][perm]
165 * Message type passed from responding service Bob to responding service Alice
166 * to complete a request and allow Alice to compute the result
168 struct GNUNET_SCALARPRODUCT_service_response {
170 * GNUNET message header
172 struct GNUNET_MessageHeader header;
175 * how many elements the session input had
177 uint32_t total_element_count GNUNET_PACKED;
180 * how many elements were included after the mask was applied including all multipart msgs.
182 uint32_t used_element_count GNUNET_PACKED;
185 * how many elements this individual message delivers
187 uint32_t contained_element_count GNUNET_PACKED;
190 * the transaction/session key used to identify a session
192 struct GNUNET_HashCode key;
195 * followed by s | s' | k[i][perm]
200 * Message type passed from service client
201 * to finalize a session as requester or responder
203 struct GNUNET_SCALARPRODUCT_client_response
206 * GNUNET message header
208 struct GNUNET_MessageHeader header;
211 * 0 if no product attached
213 uint32_t product_length GNUNET_PACKED;
216 * the transaction/session key used to identify a session
218 struct GNUNET_HashCode key;
221 * the identity of a remote peer we want to communicate with
223 struct GNUNET_PeerIdentity peer;
226 * Workaround for libgcrypt: -1 if negative, 0 if zero, else 1
231 * followed by product of length product_length (or nothing)
239 #endif /* SCALARPRODUCT_H */