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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.
47 * thus we can receive a slightly longer element (+1 byte)
49 #define PAILLIER_ELEMENT_LENGTH (2*KEYBITS/8 +1)
52 * Log an error message at log-level 'level' that indicates
53 * a failure of the command 'cmd' with the message given
54 * by gcry_strerror(rc).
56 #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)
58 ///////////////////////////////////////////////////////////////////////////////
59 // Scalar Product Message Types
60 ///////////////////////////////////////////////////////////////////////////////
63 * Message type passed from client to service
64 * to initiate a request or responder role
66 struct GNUNET_SCALARPRODUCT_client_request
69 * GNUNET message header
71 struct GNUNET_MessageHeader header;
74 * how many elements the vector in payload contains
76 uint32_t element_count GNUNET_PACKED;
79 * how many bytes the mask has
81 uint32_t mask_length GNUNET_PACKED;
84 * the transaction/session key used to identify a session
86 struct GNUNET_HashCode key;
89 * the identity of a remote peer we want to communicate with
91 struct GNUNET_PeerIdentity peer;
94 * followed by long vector[element_count] | [unsigned char mask[mask_bytes]]
99 * Message type passed from requesting service Alice to responding service Bob
100 * to initiate a request and make bob participate in our protocol
102 struct GNUNET_SCALARPRODUCT_service_request {
104 * GNUNET message header
106 struct GNUNET_MessageHeader header;
109 * how many bytes the mask has
111 uint32_t mask_length GNUNET_PACKED;
114 * the length of the publickey contained within this message
116 uint32_t pk_length GNUNET_PACKED;
119 * the transaction/session key used to identify a session
121 struct GNUNET_HashCode key;
124 * how many elements the vector in payload contains
126 uint32_t element_count GNUNET_PACKED;
129 * how many elements are actually included after the mask was applied.
131 uint32_t used_element_count GNUNET_PACKED;
134 * followed by mask | public_key | vector[used_element_count]
139 * Message type passed from responding service Bob to responding service Alice
140 * to complete a request and allow Alice to compute the result
142 struct GNUNET_SCALARPRODUCT_service_response {
144 * GNUNET message header
146 struct GNUNET_MessageHeader header;
149 * how many elements the vector in payload contains
151 uint32_t element_count GNUNET_PACKED;
154 * how many elements are actually included after the mask was applied.
156 uint32_t used_element_count GNUNET_PACKED;
159 * the transaction/session key used to identify a session
161 struct GNUNET_HashCode key;
164 * followed by s | s' | kp[] | kq[]
169 * Message type passed from service client
170 * to finalize a session as requester or responder
172 struct GNUNET_SCALARPRODUCT_client_response
175 * GNUNET message header
177 struct GNUNET_MessageHeader header;
180 * 0 if no product attached
182 uint32_t product_length GNUNET_PACKED;
185 * the transaction/session key used to identify a session
187 struct GNUNET_HashCode key;
190 * the identity of a remote peer we want to communicate with
192 struct GNUNET_PeerIdentity peer;
195 * Workaround for libgcrypt: -1 if negative, 0 if zero, else 1
200 * followed by product of length product_length (or nothing)
208 #endif /* SCALARPRODUCT_H */