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/*
This file is part of GNUnet.
(C) 2009, 2010, 2011, 2012, 2013 Christian Grothoff (and other contributing authors)
GNUnet is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published
by the Free Software Foundation; either version 3, 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
General Public License for more details.
You should have received a copy of the GNU General Public License
along with GNUnet; see the file COPYING. If not, write to the
Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.
*/
/**
* @file scalarproduct.h
* @brief Scalar Product Message Types
* @author Christian M. Fuchs
*
* Created on September 2, 2013, 3:43 PM
*/
#ifndef SCALARPRODUCT_H
#define SCALARPRODUCT_H
#ifdef __cplusplus
extern "C"
{
#endif
///////////////////////////////////////////////////////////////////////////////
// Defines
///////////////////////////////////////////////////////////////////////////////
/**
* Length of the key used for encryption
*/
#define KEYBITS 2048
/**
* When performing our crypto, we may add two encrypted values with each
* a maximal length of GNUNET_CRYPTO_RSA_DATA_ENCODING_LENGTH.
* thus we can receive a slightly longer element (+1 byte)
*/
#define PAILLIER_ELEMENT_LENGTH (2*KEYBITS/8 +1)
/**
* Maximum count of elements we can put into a multipart message
*/
#define MULTIPART_ELEMENT_CAPACITY ((GNUNET_SERVER_MAX_MESSAGE_SIZE - 1 - sizeof (struct GNUNET_SCALARPRODUCT_multipart_message)) / PAILLIER_ELEMENT_LENGTH)
/**
* Log an error message at log-level 'level' that indicates
* a failure of the command 'cmd' with the message given
* by gcry_strerror(rc).
*/
#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)
///////////////////////////////////////////////////////////////////////////////
// Scalar Product Message Types
///////////////////////////////////////////////////////////////////////////////
/**
* Message type passed from client to service
* to initiate a request or responder role
*/
struct GNUNET_SCALARPRODUCT_client_request
{
/**
* GNUNET message header
*/
struct GNUNET_MessageHeader header;
/**
* how many elements the vector in payload contains
*/
uint32_t element_count GNUNET_PACKED;
/**
* how many bytes the mask has
*/
uint32_t mask_length GNUNET_PACKED;
/**
* the transaction/session key used to identify a session
*/
struct GNUNET_HashCode key;
/**
* the identity of a remote peer we want to communicate with
*/
struct GNUNET_PeerIdentity peer;
/**
* followed by long vector[element_count] | [unsigned char mask[mask_bytes]]
*/
};
/**
* Message type passed from requesting service Alice to responding service Bob
* to initiate a request and make bob participate in our protocol
*/
struct GNUNET_SCALARPRODUCT_service_request {
/**
* GNUNET message header
*/
struct GNUNET_MessageHeader header;
/**
* how many elements the total message including all multipart msgs contains
*/
uint32_t total_element_count GNUNET_PACKED;
/**
* how many elements are actually included after the mask was applied.
*/
uint32_t contained_element_count GNUNET_PACKED;
/**
* how many bytes the mask has
*/
uint32_t mask_length GNUNET_PACKED;
/**
* the length of the publickey contained within this message
*/
uint32_t pk_length GNUNET_PACKED;
/**
* the transaction/session key used to identify a session
*/
struct GNUNET_HashCode key;
/**
* how many elements the vector in payload contains
*/
uint32_t element_count GNUNET_PACKED;
/**
* followed by mask | public_key | vector[used_element_count]
*/
};
/**
* Multipart Message type passed between to supply additional elements for the peer
*/
struct GNUNET_SCALARPRODUCT_multipart_message {
/**
* GNUNET message header
*/
struct GNUNET_MessageHeader header;
/**
* how many elements we supply within this message
*/
uint32_t multipart_element_count GNUNET_PACKED;
// followed by vector[multipart_element_count] or k[i][perm]
};
/**
* Message type passed from responding service Bob to responding service Alice
* to complete a request and allow Alice to compute the result
*/
struct GNUNET_SCALARPRODUCT_service_response {
/**
* GNUNET message header
*/
struct GNUNET_MessageHeader header;
/**
* how many elements the session input had
*/
uint32_t total_element_count GNUNET_PACKED;
/**
* how many elements were included after the mask was applied including all multipart msgs.
*/
uint32_t used_element_count GNUNET_PACKED;
/**
* how many elements this individual message delivers
*/
uint32_t contained_element_count GNUNET_PACKED;
/**
* the transaction/session key used to identify a session
*/
struct GNUNET_HashCode key;
/**
* followed by s | s' | k[i][perm]
*/
};
/**
* Message type passed from service client
* to finalize a session as requester or responder
*/
struct GNUNET_SCALARPRODUCT_client_response
{
/**
* GNUNET message header
*/
struct GNUNET_MessageHeader header;
/**
* 0 if no product attached
*/
uint32_t product_length GNUNET_PACKED;
/**
* the transaction/session key used to identify a session
*/
struct GNUNET_HashCode key;
/**
* the identity of a remote peer we want to communicate with
*/
struct GNUNET_PeerIdentity peer;
/**
* Workaround for libgcrypt: -1 if negative, 0 if zero, else 1
*/
int8_t range;
/**
* followed by product of length product_length (or nothing)
*/
};
#ifdef __cplusplus
}
#endif
#endif /* SCALARPRODUCT_H */
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