*/
enum SessionState
{
- CLIENT_REQUEST_RECEIVED,
- WAITING_FOR_BOBS_CONNECT,
- CLIENT_RESPONSE_RECEIVED,
- WAITING_FOR_SERVICE_REQUEST,
- WAITING_FOR_SERVICE_RESPONSE,
- SERVICE_REQUEST_RECEIVED,
- SERVICE_RESPONSE_RECEIVED,
- FINALIZED
+ CLIENT_REQUEST_RECEIVED,
+ WAITING_FOR_BOBS_CONNECT,
+ CLIENT_RESPONSE_RECEIVED,
+ WAITING_FOR_SERVICE_REQUEST,
+ WAITING_FOR_MULTIPART_TRANSMISSION,
+ WAITING_FOR_SERVICE_RESPONSE,
+ SERVICE_REQUEST_RECEIVED,
+ SERVICE_RESPONSE_RECEIVED,
+ FINALIZED
};
/**
*/
enum PeerRole
{
- ALICE,
- BOB
+ ALICE,
+ BOB
};
/**
* A scalarproduct session which tracks:
- *
+ *
* a request form the client to our final response.
* or
* a request from a service to us(service).
*/
struct ServiceSession
{
- /**
- * the role this peer has
- */
- enum PeerRole role;
-
- /**
- * session information is kept in a DLL
- */
- struct ServiceSession *next;
-
- /**
- * session information is kept in a DLL
- */
- struct ServiceSession *prev;
-
- /**
- * (hopefully) unique transaction ID
- */
- struct GNUNET_HashCode key;
-
- /**
- * state of the session
- */
- enum SessionState state;
-
- /**
- * Alice or Bob's peerID
- */
- struct GNUNET_PeerIdentity peer;
-
- /**
- * the client this request is related to
- */
- struct GNUNET_SERVER_Client * client;
-
- /**
- * The message to send
- */
- struct GNUNET_MessageHeader * msg;
-
- /**
- * how many elements we were supplied with from the client
- */
- uint32_t element_count;
-
- /**
- * how many elements actually are used after applying the mask
- */
- uint32_t used_element_count;
-
- /**
- * how many bytes the mask is long.
- * just for convenience so we don't have to re-re-re calculate it each time
- */
- uint32_t mask_length;
-
- /**
- * all the vector elements we received
- */
- int32_t * vector;
-
- /**
- * mask of which elements to check
- */
- unsigned char * mask;
-
- /**
- * Public key of the remote service, only used by bob
- */
- gcry_sexp_t remote_pubkey;
-
- /**
- * E(ai)(Bob) or ai(Alice) after applying the mask
- */
- gcry_mpi_t * a;
-
- /**
- * The computed scalar
- */
- gcry_mpi_t product;
-
- /**
- * My transmit handle for the current message to a alice/bob
- */
- struct GNUNET_MESH_TransmitHandle * service_transmit_handle;
-
- /**
- * My transmit handle for the current message to the client
- */
- struct GNUNET_SERVER_TransmitHandle * client_transmit_handle;
-
- /**
- * tunnel-handle associated with our mesh handle
- */
- struct GNUNET_MESH_Tunnel * tunnel;
-
- GNUNET_SCHEDULER_TaskIdentifier client_notification_task;
-
- GNUNET_SCHEDULER_TaskIdentifier service_request_task;
+ /**
+ * the role this peer has
+ */
+ enum PeerRole role;
+
+ /**
+ * session information is kept in a DLL
+ */
+ struct ServiceSession *next;
+
+ /**
+ * session information is kept in a DLL
+ */
+ struct ServiceSession *prev;
+
+ /**
+ * (hopefully) unique transaction ID
+ */
+ struct GNUNET_HashCode key;
+
+ /**
+ * state of the session
+ */
+ enum SessionState state;
+
+ /**
+ * Alice or Bob's peerID
+ */
+ struct GNUNET_PeerIdentity peer;
+
+ /**
+ * the client this request is related to
+ */
+ struct GNUNET_SERVER_Client * client;
+
+ /**
+ * The message to send
+ */
+ struct GNUNET_MessageHeader * msg;
+
+ /**
+ * how many elements we were supplied with from the client
+ */
+ uint32_t element_count;
+
+ /**
+ * how many elements actually are used after applying the mask
+ */
+ uint32_t used_element_count;
+
+ /**
+ * already transferred elements (sent/received) for multipart messages, less or equal than used_element_count for
+ */
+ uint32_t transferred_element_count;
+
+ /**
+ * index of the last transferred element for multipart messages
+ */
+ uint32_t last_processed_element;
+
+ /**
+ * how many bytes the mask is long.
+ * just for convenience so we don't have to re-re-re calculate it each time
+ */
+ uint32_t mask_length;
+
+ /**
+ * all the vector elements we received
+ */
+ int32_t * vector;
+
+ /**
+ * mask of which elements to check
+ */
+ unsigned char * mask;
+
+ /**
+ * Public key of the remote service, only used by bob
+ */
+ gcry_sexp_t remote_pubkey;
+
+ /**
+ * E(ai)(Bob) or ai(Alice) after applying the mask
+ */
+ gcry_mpi_t * a;
+
+ /**
+ * Bob's permutation p of R
+ */
+ gcry_mpi_t * r;
+
+ /**
+ * Bob's permutation q of R
+ */
+ gcry_mpi_t * r_prime;
+
+ /**
+ * Bob's s
+ */
+ gcry_mpi_t s;
+
+ /**
+ * Bob's s'
+ */
+ gcry_mpi_t s_prime;
+
+ /**
+ * Bobs matching response session from the client
+ */
+ struct ServiceSession * response;
+
+ /**
+ * The computed scalar
+ */
+ gcry_mpi_t product;
+
+ /**
+ * My transmit handle for the current message to a alice/bob
+ */
+ struct GNUNET_MESH_TransmitHandle * service_transmit_handle;
+
+ /**
+ * My transmit handle for the current message to the client
+ */
+ struct GNUNET_SERVER_TransmitHandle * client_transmit_handle;
+
+ /**
+ * tunnel-handle associated with our mesh handle
+ */
+ struct GNUNET_MESH_Tunnel * tunnel;
+
+ GNUNET_SCHEDULER_TaskIdentifier client_notification_task;
+
+ GNUNET_SCHEDULER_TaskIdentifier service_request_task;
};
///////////////////////////////////////////////////////////////////////////////
static gcry_mpi_t my_offset;
/**
- * Head of our double linked list for client-requests sent to us.
+ * Head of our double linked list for client-requests sent to us.
* for all of these elements we calculate a scalar product with a remote peer
* split between service->service and client->service for simplicity
*/
static struct ServiceSession * from_client_head;
/**
- * Tail of our double linked list for client-requests sent to us.
+ * Tail of our double linked list for client-requests sent to us.
* for all of these elements we calculate a scalar product with a remote peer
* split between service->service and client->service for simplicity
*/
static struct ServiceSession * from_client_tail;
/**
- * Head of our double linked list for service-requests sent to us.
+ * Head of our double linked list for service-requests sent to us.
* for all of these elements we help the requesting service in calculating a scalar product
* split between service->service and client->service for simplicity
*/
static struct ServiceSession * from_service_head;
/**
- * Tail of our double linked list for service-requests sent to us.
+ * Tail of our double linked list for service-requests sent to us.
* for all of these elements we help the requesting service in calculating a scalar product
* split between service->service and client->service for simplicity
*/
// Helper Functions
///////////////////////////////////////////////////////////////////////////////
-
/**
* Generates an Paillier private/public keyset and extracts the values using libgrcypt only
*/
static void
generate_keyset ()
{
- gcry_sexp_t gen_parms;
+ gcry_sexp_t gen_params;
gcry_sexp_t key;
gcry_sexp_t tmp_sexp;
gcry_mpi_t p;
size_t erroff = 0;
// we can still use the RSA keygen for generating p,q,n, but using e is pointless.
- GNUNET_assert (0 == gcry_sexp_build (&gen_parms, &erroff,
+ GNUNET_assert (0 == gcry_sexp_build (&gen_params, &erroff,
"(genkey(rsa(nbits %d)(rsa-use-e 3:257)))",
KEYBITS));
- GNUNET_assert (0 == gcry_pk_genkey (&key, gen_parms));
- gcry_sexp_release (gen_parms);
+ GNUNET_assert (0 == gcry_pk_genkey (&key, gen_params));
+ gcry_sexp_release (gen_params);
- // get n and d of our publickey as MPI
+ // get n and d of our publickey as MPI
tmp_sexp = gcry_sexp_find_token (key, "n", 0);
GNUNET_assert (tmp_sexp);
my_n = gcry_sexp_nth_mpi (tmp_sexp, 1, GCRYMPI_FMT_USG);
// generate a g
gcry_mpi_mul (my_nsquare, my_n, my_n);
- do
- {
+ do {
// find a matching g
- do
- {
+ do {
gcry_mpi_randomize (my_g, KEYBITS * 2, GCRY_WEAK_RANDOM);
// g must be smaller than n^2
if (0 >= gcry_mpi_cmp (my_g, my_nsquare))
gcry_sexp_release (key);
// offset has to be sufficiently small to allow computation of:
- // m1+m2 mod n == (S + a) + (S + b) mod n,
+ // m1+m2 mod n == (S + a) + (S + b) mod n,
// if we have more complex operations, this factor needs to be lowered
my_offset = gcry_mpi_new (KEYBITS / 3);
gcry_mpi_set_bit (my_offset, KEYBITS / 3);
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, _ ("Generated key set with key length %d bits.\n"), KEYBITS);
}
-
/**
* If target != size, move target bytes to the
* end of the size-sized buffer and zero out the
static void
adjust (unsigned char *buf, size_t size, size_t target)
{
- if (size < target)
- {
+ if (size < target) {
memmove (&buf[target - size], buf, size);
memset (buf, 0, target - size);
}
}
-
/**
* encrypts an element using the paillier crypto system
- *
+ *
* @param c ciphertext (output)
* @param m plaintext
* @param g the public base
GNUNET_assert (tmp = gcry_mpi_new (0));
- while (0 >= gcry_mpi_cmp_ui (tmp, 1))
- {
+ while (0 >= gcry_mpi_cmp_ui (tmp, 1)) {
gcry_mpi_randomize (tmp, KEYBITS / 3, GCRY_WEAK_RANDOM);
// r must be 1 < r < n
}
gcry_mpi_release (tmp);
}
-
/**
* decrypts an element using the paillier crypto system
- *
+ *
* @param m plaintext (output)
* @param c the ciphertext
* @param mu the modifier to correct encryption
gcry_mpi_mulm (m, m, mu, n);
}
-
/**
* computes the square sum over a vector of a given length.
- *
+ *
* @param vector the vector to encrypt
* @param length the length of the vector
* @return an MPI value containing the calculated sum, never NULL
GNUNET_assert (elem = gcry_mpi_new (0));
// calculare E(sum (ai ^ 2), publickey)
- for (i = 0; i < length; i++)
- {
+ for (i = 0; i < length; i++) {
gcry_mpi_mul (elem, vector[i], vector[i]);
gcry_mpi_add (sum, sum, elem);
}
}
+static void
+prepare_service_request_multipart (void *cls,
+ const struct GNUNET_SCHEDULER_TaskContext *tc);
+static void
+prepare_service_response_multipart (void *cls,
+ const struct GNUNET_SCHEDULER_TaskContext *tc);
+
/**
* Primitive callback for copying over a message, as they
* usually are too complex to be handled in the callback itself.
* clears a session-callback, if a session was handed over and the transmit handle was stored
- *
+ *
* @param cls the message object
* @param size the size of the buffer we got
* @param buf the buffer to copy the message to
GNUNET_assert (buf);
- if (ntohs (session->msg->size) == size)
- {
+ if (ntohs (session->msg->size) == size) {
memcpy (buf, session->msg, size);
written = size;
}
session->state = FINALIZED;
session->client_transmit_handle = NULL;
break;
+ case GNUNET_MESSAGE_TYPE_SCALARPRODUCT_ALICE_TO_BOB:
+ case GNUNET_MESSAGE_TYPE_SCALARPRODUCT_ALICE_TO_BOB_MULTIPART:
+ //else
+ session->service_transmit_handle = NULL;
+ // reset flags for sending
+ if ((session->state != WAITING_FOR_MULTIPART_TRANSMISSION) && (session->used_element_count != session->transferred_element_count))
+ prepare_service_request_multipart (session, NULL);
+ //TODO we have sent a message and now need to trigger trigger the next multipart message sending
+ break;
+ case GNUNET_MESSAGE_TYPE_SCALARPRODUCT_BOB_TO_ALICE:
+ case GNUNET_MESSAGE_TYPE_SCALARPRODUCT_BOB_TO_ALICE_MULTIPART:
+ //else
+ session->service_transmit_handle = NULL;
+ if ((session->state != WAITING_FOR_MULTIPART_TRANSMISSION) && (session->used_element_count != session->transferred_element_count))
+ prepare_service_response_multipart (session, NULL);
+ break;
default:
session->service_transmit_handle = NULL;
}
return written;
}
-
/**
* initializes a new vector with fresh MPI values (=0) of a given length
- *
+ *
* @param length of the vector to create
* @return the initialized vector, never NULL
*/
return output;
}
-
/**
* permutes an MPI vector according to the given permutation vector
- *
+ *
* @param vector the vector to permuted
* @param perm the permutation to use
* @param length the length of the vectors
// backup old layout
memcpy (tmp, vector, length * sizeof (gcry_mpi_t));
- // permute vector according to given
+ // permute vector according to given
for (i = 0; i < length; i++)
vector[i] = tmp[perm[i]];
return vector;
}
-
/**
- * Populate a vector with random integer values and convert them to
- *
+ * Populate a vector with random integer values and convert them to
+ *
* @param length the length of the vector we must generate
* @return an array of MPI values with random values
*/
uint32_t i;
random_vector = initialize_mpi_vector (length);
- for (i = 0; i < length; i++)
- {
+ for (i = 0; i < length; i++) {
value = (int32_t) GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, UINT32_MAX);
// long to gcry_mpi_t
return random_vector;
}
-
/**
- * Finds a not terminated client/service session in the
+ * Finds a not terminated client/service session in the
* given DLL based on session key, element count and state.
- *
+ *
* @param tail - the tail of the DLL
* @param my - the session to compare it to
- * @return a pointer to a matching session,
+ * @return a pointer to a matching session,
* else NULL
*/
static struct ServiceSession *
{
struct ServiceSession * curr;
- for (curr = tail; NULL != curr; curr = curr->prev)
- {
+ for (curr = tail; NULL != curr; curr = curr->prev) {
// if the key matches, and the element_count is same
if ((!memcmp (&curr->key, key, sizeof (struct GNUNET_HashCode)))
- && (curr->element_count == element_count))
- {
+ && (curr->element_count == element_count)) {
// if incoming state is NULL OR is same as state of the queued request
- if ((NULL == state) || (curr->state == *state))
- {
+ if ((NULL == state) || (curr->state == *state)) {
// if peerid is NULL OR same as the peer Id in the queued request
if ((NULL == peerid)
|| (!memcmp (&curr->peer, peerid, sizeof (struct GNUNET_PeerIdentity))))
return NULL;
}
-
static void
free_session (struct ServiceSession * session)
{
unsigned int i;
- if (session->a)
- {
+ if (session->a) {
for (i = 0; i < session->used_element_count; i++)
gcry_mpi_release (session->a[i]);
// Event and Message Handlers
///////////////////////////////////////////////////////////////////////////////
-
/**
- * A client disconnected.
- *
- * Remove the associated session(s), release datastructures
+ * A client disconnected.
+ *
+ * Remove the associated session(s), release datastructures
* and cancel pending outgoing transmissions to the client.
* if the session has not yet completed, we also cancel Alice's request to Bob.
*
_ ("Client (%p) disconnected from us.\n"), client);
GNUNET_CONTAINER_DLL_remove (from_client_head, from_client_tail, session);
- if (!(session->role == BOB && session->state == FINALIZED))
- {
+ if (!(session->role == BOB && session->state == FINALIZED)) {
//we MUST terminate any client message underway
if (session->service_transmit_handle && session->tunnel)
GNUNET_MESH_notify_transmit_ready_cancel (session->service_transmit_handle);
if (session->tunnel && session->state == WAITING_FOR_SERVICE_RESPONSE)
GNUNET_MESH_tunnel_destroy (session->tunnel);
}
- if (GNUNET_SCHEDULER_NO_TASK != session->client_notification_task)
- {
+ if (GNUNET_SCHEDULER_NO_TASK != session->client_notification_task) {
GNUNET_SCHEDULER_cancel (session->client_notification_task);
session->client_notification_task = GNUNET_SCHEDULER_NO_TASK;
}
- if (GNUNET_SCHEDULER_NO_TASK != session->service_request_task)
- {
+ if (GNUNET_SCHEDULER_NO_TASK != session->service_request_task) {
GNUNET_SCHEDULER_cancel (session->service_request_task);
session->service_request_task = GNUNET_SCHEDULER_NO_TASK;
}
- if (NULL != session->client_transmit_handle)
- {
+ if (NULL != session->client_transmit_handle) {
GNUNET_SERVER_notify_transmit_ready_cancel (session->client_transmit_handle);
session->client_transmit_handle = NULL;
}
free_session (session);
}
-
/**
* Notify the client that the session has succeeded or failed completely.
- * This message gets sent to
+ * This message gets sent to
* * alice's client if bob disconnected or to
* * bob's client if the operation completed or alice disconnected
- *
+ *
* @param client_session the associated client session
* @return GNUNET_NO, if we could not notify the client
* GNUNET_YES if we notified it.
memcpy (&msg->key, &session->key, sizeof (struct GNUNET_HashCode));
memcpy (&msg->peer, &session->peer, sizeof ( struct GNUNET_PeerIdentity));
msg->header.size = htons (sizeof (struct GNUNET_SCALARPRODUCT_client_response));
- // signal error if not signalized, positive result-range field but zero length.
+ // signal error if not signalized, positive result-range field but zero length.
msg->product_length = htonl (0);
msg->range = (session->state == FINALIZED) ? 0 : -1;
session);
// if we could not even queue our request, something is wrong
- if (NULL == session->client_transmit_handle)
- {
+ if (NULL == session->client_transmit_handle) {
GNUNET_log (GNUNET_ERROR_TYPE_WARNING, _ ("Could not send message to client (%p)!\n"), session->client);
// usually gets freed by do_send_message
session->msg = NULL;
}
+static void
+prepare_service_response_multipart (void *cls,
+ const struct GNUNET_SCHEDULER_TaskContext *tc)
+{
+ struct ServiceSession * session = cls;
+ unsigned char * current;
+ unsigned char * element_exported;
+ struct GNUNET_SCALARPRODUCT_multipart_message * msg;
+ unsigned int i;
+ uint32_t msg_length;
+ uint32_t todo_count;
+ size_t element_length = 0; // initialized by gcry_mpi_print, but the compiler doesn't know that
+
+ msg_length = sizeof (struct GNUNET_SCALARPRODUCT_multipart_message);
+ todo_count = session->used_element_count - session->transferred_element_count;
+
+ if (todo_count > MULTIPART_ELEMENT_CAPACITY / 2)
+ // send the currently possible maximum chunk, we always transfer both permutations
+ todo_count = MULTIPART_ELEMENT_CAPACITY / 2;
+
+ msg_length += todo_count * PAILLIER_ELEMENT_LENGTH * 2;
+ msg = GNUNET_malloc (msg_length);
+ msg->header.type = htons (GNUNET_MESSAGE_TYPE_SCALARPRODUCT_ALICE_TO_BOB_MULTIPART);
+ msg->header.size = htons (msg_length);
+ msg->multipart_element_count = htonl (todo_count);
+
+ element_exported = GNUNET_malloc (PAILLIER_ELEMENT_LENGTH);
+ current = (unsigned char *) &msg[1];
+ // convert k[][]
+ for (i = session->transferred_element_count; i < session->transferred_element_count + todo_count; i++) {
+ //k[i][p]
+ memset (element_exported, 0, PAILLIER_ELEMENT_LENGTH);
+ GNUNET_assert (0 == gcry_mpi_print (GCRYMPI_FMT_USG,
+ element_exported, PAILLIER_ELEMENT_LENGTH,
+ &element_length,
+ session->r[i]));
+ adjust (element_exported, element_length, PAILLIER_ELEMENT_LENGTH);
+ memcpy (current, element_exported, PAILLIER_ELEMENT_LENGTH);
+ current += PAILLIER_ELEMENT_LENGTH;
+ //k[i][q]
+ memset (element_exported, 0, PAILLIER_ELEMENT_LENGTH);
+ GNUNET_assert (0 == gcry_mpi_print (GCRYMPI_FMT_USG,
+ element_exported, PAILLIER_ELEMENT_LENGTH,
+ &element_length,
+ session->r_prime[i]));
+ adjust (element_exported, element_length, PAILLIER_ELEMENT_LENGTH);
+ memcpy (current, element_exported, PAILLIER_ELEMENT_LENGTH);
+ current += PAILLIER_ELEMENT_LENGTH;
+ }
+ GNUNET_free (element_exported);
+ for (i = session->transferred_element_count; i < session->transferred_element_count; i++) {
+ gcry_mpi_release (session->r_prime[i]);
+ gcry_mpi_release (session->r[i]);
+ }
+ session->transferred_element_count += todo_count;
+ session->msg = (struct GNUNET_MessageHeader *) msg;
+ session->service_transmit_handle =
+ GNUNET_MESH_notify_transmit_ready (session->tunnel,
+ GNUNET_YES,
+ GNUNET_TIME_UNIT_FOREVER_REL,
+ msg_length,
+ &do_send_message,
+ session);
+ //disconnect our client
+ if (NULL == session->service_transmit_handle) {
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR, _ ("Could not send service-response message via mesh!)\n"));
+ session->state = FINALIZED;
+
+ session->response->client_notification_task =
+ GNUNET_SCHEDULER_add_now (&prepare_client_end_notification,
+ session->response);
+ return;
+ }
+ if (session->transferred_element_count != session->used_element_count)
+ // multipart
+ session->state = WAITING_FOR_MULTIPART_TRANSMISSION;
+ else
+ //singlepart
+ session->state = FINALIZED;
+}
/**
* Bob executes:
- * generates the response message to be sent to alice after computing
+ * generates the response message to be sent to alice after computing
* the values (1), (2), S and S'
* (1)[]: $E_A(a_{pi(i)}) times E_A(- r_{pi(i)} - b_{pi(i)}) &= E_A(a_{pi(i)} - r_{pi(i)} - b_{pi(i)})$
* (2)[]: $E_A(a_{pi'(i)}) times E_A(- r_{pi'(i)}) &= E_A(a_{pi'(i)} - r_{pi'(i)})$
* S: $S := E_A(sum (r_i + b_i)^2)$
* S': $S' := E_A(sum r_i^2)$
- *
- * @param r (1)[]: $E_A(a_{pi(i)}) times E_A(- r_{pi(i)} - b_{pi(i)}) &= E_A(a_{pi(i)} - r_{pi(i)} - b_{pi(i)})$
- * @param r_prime (2)[]: $E_A(a_{pi'(i)}) times E_A(- r_{pi'(i)}) &= E_A(a_{pi'(i)} - r_{pi'(i)})$
+ *
* @param s S: $S := E_A(sum (r_i + b_i)^2)$
* @param s_prime S': $S' := E_A(sum r_i^2)$
- * @param request the associated requesting session with alice
- * @param response the associated responder session with bob's client
- * @return GNUNET_SYSERR if the function was called with NULL parameters or if there was an error
- * GNUNET_NO if we could not send our message
+ * @param session the associated requesting session with alice
+ * @return GNUNET_NO if we could not send our message
* GNUNET_OK if the operation succeeded
*/
static int
-prepare_service_response (gcry_mpi_t * r,
- gcry_mpi_t * r_prime,
- gcry_mpi_t s,
+prepare_service_response (gcry_mpi_t s,
gcry_mpi_t s_prime,
- struct ServiceSession * request,
- struct ServiceSession * response)
+ struct ServiceSession * session)
{
struct GNUNET_SCALARPRODUCT_service_response * msg;
uint32_t msg_length = 0;
int i;
msg_length = sizeof (struct GNUNET_SCALARPRODUCT_service_response)
- + 2 * request->used_element_count * PAILLIER_ELEMENT_LENGTH // kp, kq
+ 2 * PAILLIER_ELEMENT_LENGTH; // s, stick
+ if (GNUNET_SERVER_MAX_MESSAGE_SIZE > msg_length + 2 * session->used_element_count * PAILLIER_ELEMENT_LENGTH) { //kp, kq
+ msg_length += +2 * session->used_element_count * PAILLIER_ELEMENT_LENGTH;
+ session->transferred_element_count = session->used_element_count;
+ }
+ else {
+ session->transferred_element_count = (GNUNET_SERVER_MAX_MESSAGE_SIZE - 1 - msg_length) / (PAILLIER_ELEMENT_LENGTH * 2);
+ }
+
msg = GNUNET_malloc (msg_length);
msg->header.type = htons (GNUNET_MESSAGE_TYPE_SCALARPRODUCT_BOB_TO_ALICE);
msg->header.size = htons (msg_length);
- msg->element_count = htonl (request->element_count);
- msg->used_element_count = htonl (request->used_element_count);
- memcpy (&msg->key, &request->key, sizeof (struct GNUNET_HashCode));
+ msg->total_element_count = htonl (session->element_count);
+ msg->contained_element_count = htonl (session->used_element_count);
+ msg->contained_element_count = htonl (session->transferred_element_count);
+ memcpy (&msg->key, &session->key, sizeof (struct GNUNET_HashCode));
current = (unsigned char *) &msg[1];
+ element_exported = GNUNET_malloc (PAILLIER_ELEMENT_LENGTH);
// 4 times the same logics with slight variations.
// doesn't really justify having 2 functions for that
- // so i put it into blocks to enhance readability
+ // so i put it into blocks to enhance readability
// convert s
- {
- element_exported = GNUNET_malloc (PAILLIER_ELEMENT_LENGTH);
- GNUNET_assert (0 == gcry_mpi_print (GCRYMPI_FMT_USG,
- element_exported, PAILLIER_ELEMENT_LENGTH,
- &element_length,
- s));
- adjust (element_exported, element_length, PAILLIER_ELEMENT_LENGTH);
- memcpy (current, element_exported, PAILLIER_ELEMENT_LENGTH);
- GNUNET_free (element_exported);
- current += PAILLIER_ELEMENT_LENGTH;
- }
+ memset (element_exported, 0, PAILLIER_ELEMENT_LENGTH);
+ GNUNET_assert (0 == gcry_mpi_print (GCRYMPI_FMT_USG,
+ element_exported, PAILLIER_ELEMENT_LENGTH,
+ &element_length,
+ s));
+ adjust (element_exported, element_length, PAILLIER_ELEMENT_LENGTH);
+ memcpy (current, element_exported, PAILLIER_ELEMENT_LENGTH);
+ current += PAILLIER_ELEMENT_LENGTH;
// convert stick
- {
- element_exported = GNUNET_malloc (PAILLIER_ELEMENT_LENGTH);
- GNUNET_assert (0 == gcry_mpi_print (GCRYMPI_FMT_USG,
- element_exported, PAILLIER_ELEMENT_LENGTH,
- &element_length,
- s_prime));
- adjust (element_exported, element_length, PAILLIER_ELEMENT_LENGTH);
- memcpy (current, element_exported, PAILLIER_ELEMENT_LENGTH);
- GNUNET_free (element_exported);
- current += PAILLIER_ELEMENT_LENGTH;
- }
+ memset (element_exported, 0, PAILLIER_ELEMENT_LENGTH);
+ GNUNET_assert (0 == gcry_mpi_print (GCRYMPI_FMT_USG,
+ element_exported, PAILLIER_ELEMENT_LENGTH,
+ &element_length,
+ s_prime));
+ adjust (element_exported, element_length, PAILLIER_ELEMENT_LENGTH);
+ memcpy (current, element_exported, PAILLIER_ELEMENT_LENGTH);
+ current += PAILLIER_ELEMENT_LENGTH;
- // convert kp[]
- for (i = 0; i < request->used_element_count; i++)
- {
- element_exported = GNUNET_malloc (PAILLIER_ELEMENT_LENGTH);
+ // convert k[][]
+ for (i = 0; i < session->transferred_element_count; i++) {
+ //k[i][p]
+ memset (element_exported, 0, PAILLIER_ELEMENT_LENGTH);
GNUNET_assert (0 == gcry_mpi_print (GCRYMPI_FMT_USG,
element_exported, PAILLIER_ELEMENT_LENGTH,
&element_length,
- r[i]));
+ session->r[i]));
adjust (element_exported, element_length, PAILLIER_ELEMENT_LENGTH);
memcpy (current, element_exported, PAILLIER_ELEMENT_LENGTH);
- GNUNET_free (element_exported);
current += PAILLIER_ELEMENT_LENGTH;
- }
-
-
- // convert kq[]
- for (i = 0; i < request->used_element_count; i++)
- {
- element_exported = GNUNET_malloc (PAILLIER_ELEMENT_LENGTH);
+ //k[i][q]
+ memset (element_exported, 0, PAILLIER_ELEMENT_LENGTH);
GNUNET_assert (0 == gcry_mpi_print (GCRYMPI_FMT_USG,
element_exported, PAILLIER_ELEMENT_LENGTH,
&element_length,
- r_prime[i]));
+ session->r_prime[i]));
adjust (element_exported, element_length, PAILLIER_ELEMENT_LENGTH);
memcpy (current, element_exported, PAILLIER_ELEMENT_LENGTH);
- GNUNET_free (element_exported);
current += PAILLIER_ELEMENT_LENGTH;
}
- if (GNUNET_SERVER_MAX_MESSAGE_SIZE >= msg_length)
- {
- request->msg = (struct GNUNET_MessageHeader *) msg;
- request->service_transmit_handle =
- GNUNET_MESH_notify_transmit_ready (request->tunnel,
- GNUNET_YES,
- GNUNET_TIME_UNIT_FOREVER_REL,
- msg_length,
- &do_send_message,
- request);
- request->state = FINALIZED;
+ GNUNET_free (element_exported);
+ for (i = 0; i < session->transferred_element_count; i++) {
+ gcry_mpi_release (session->r_prime[i]);
+ gcry_mpi_release (session->r[i]);
}
- else
- GNUNET_log (GNUNET_ERROR_TYPE_WARNING, _ ("Message too large, fragmentation is currently not supported!)\n"));
+ gcry_mpi_release (s);
+ gcry_mpi_release (s_prime);
+ session->msg = (struct GNUNET_MessageHeader *) msg;
+ session->service_transmit_handle =
+ GNUNET_MESH_notify_transmit_ready (session->tunnel,
+ GNUNET_YES,
+ GNUNET_TIME_UNIT_FOREVER_REL,
+ msg_length,
+ &do_send_message,
+ session);
//disconnect our client
- if (NULL == request->service_transmit_handle)
- {
+ if (NULL == session->service_transmit_handle) {
GNUNET_log (GNUNET_ERROR_TYPE_ERROR, _ ("Could not send service-response message via mesh!)\n"));
+ session->state = FINALIZED;
- response->client_notification_task =
+ session->response->client_notification_task =
GNUNET_SCHEDULER_add_now (&prepare_client_end_notification,
- response);
+ session->response);
return GNUNET_NO;
}
+ if (session->transferred_element_count != session->used_element_count)
+ // multipart
+ session->state = WAITING_FOR_MULTIPART_TRANSMISSION;
+ else
+ //singlepart
+ session->state = FINALIZED;
+
return GNUNET_OK;
}
-
/**
- * executed by bob:
- * compute the values
+ * executed by bob:
+ * compute the values
* (1)[]: $E_A(a_{\pi(i)}) \otimes E_A(- r_{\pi(i)} - b_{\pi(i)}) &= E_A(a_{\pi(i)} - r_{\pi(i)} - b_{\pi(i)})$
* (2)[]: $E_A(a_{\pi'(i)}) \otimes E_A(- r_{\pi'(i)}) &= E_A(a_{\pi'(i)} - r_{\pi'(i)})$
* S: $S := E_A(\sum (r_i + b_i)^2)$
* S': $S' := E_A(\sum r_i^2)$
- *
+ *
* @param request the requesting session + bob's requesting peer
* @param response the responding session + bob's client handle
* @return GNUNET_SYSERR if the computation failed
rand_pi_prime = GNUNET_malloc (sizeof (gcry_mpi_t) * count);
// convert responder session to from long to mpi
- for (i = 0, j = 0; i < response->element_count && j < count; i++)
- {
- if (request->mask[i / 8] & (1 << (i % 8)))
- {
+ for (i = 0, j = 0; i < response->element_count && j < count; i++) {
+ if (request->mask[i / 8] & (1 << (i % 8))) {
value = response->vector[i] >= 0 ? response->vector[i] : -response->vector[i];
// long to gcry_mpi_t
- if (0 > response->vector[i])
- {
+ if (0 > response->vector[i]) {
b[j] = gcry_mpi_new (0);
gcry_mpi_sub_ui (b[j], b[j], value);
}
- else
- {
+ else {
b[j] = gcry_mpi_set_ui (NULL, value);
}
j++;
response->vector = NULL;
tmp_exp = gcry_sexp_find_token (request->remote_pubkey, "n", 0);
- if (!tmp_exp)
- {
+ if (!tmp_exp) {
GNUNET_break_op (0);
gcry_sexp_release (request->remote_pubkey);
request->remote_pubkey = NULL;
goto except;
}
remote_n = gcry_sexp_nth_mpi (tmp_exp, 1, GCRYMPI_FMT_USG);
- if (!remote_n)
- {
+ if (!remote_n) {
GNUNET_break (0);
gcry_sexp_release (tmp_exp);
goto except;
tmp_exp = gcry_sexp_find_token (request->remote_pubkey, "g", 0);
gcry_sexp_release (request->remote_pubkey);
request->remote_pubkey = NULL;
- if (!tmp_exp)
- {
+ if (!tmp_exp) {
GNUNET_break_op (0);
gcry_mpi_release (remote_n);
goto except;
}
remote_g = gcry_sexp_nth_mpi (tmp_exp, 1, GCRYMPI_FMT_USG);
- if (!remote_g)
- {
+ if (!remote_g) {
GNUNET_break (0);
gcry_mpi_release (remote_n);
gcry_sexp_release (tmp_exp);
r = initialize_mpi_vector (count);
r_prime = initialize_mpi_vector (count);
- // copy the REFERNCES of a, b and r into aq and bq. we will not change
+ // copy the REFERNCES of a, b and r into aq and bq. we will not change
// those values, thus we can work with the references
memcpy (a_pi, request->a, sizeof (gcry_mpi_t) * count);
memcpy (a_pi_prime, request->a, sizeof (gcry_mpi_t) * count);
// encrypt the element
// for the sake of readability I decided to have dedicated permutation
- // vectors, which get rid of all the lookups in p/q.
+ // vectors, which get rid of all the lookups in p/q.
// however, ap/aq are not absolutely necessary but are just abstraction
// Calculate Kp = E(S + a_pi) (+) E(S - r_pi - b_pi)
- for (i = 0; i < count; i++)
- {
+ for (i = 0; i < count; i++) {
// E(S - r_pi - b_pi)
gcry_mpi_sub (r[i], my_offset, rand_pi[i]);
gcry_mpi_sub (r[i], r[i], b_pi[i]);
GNUNET_free (rand_pi);
// Calculate Kq = E(S + a_qi) (+) E(S - r_qi)
- for (i = 0; i < count; i++)
- {
+ for (i = 0; i < count; i++) {
// E(S - r_qi)
gcry_mpi_sub (r_prime[i], my_offset, rand_pi_prime[i]);
encrypt_element (r_prime[i], r_prime[i], remote_g, remote_n, remote_nsquare);
GNUNET_free (a_pi_prime);
GNUNET_free (rand_pi_prime);
+ request->r = r;
+ request->r_prime = r_prime;
+ request->response = response;
+
// Calculate S' = E(SUM( r_i^2 ))
s_prime = compute_square_sum (rand, count);
encrypt_element (s_prime, s_prime, remote_g, remote_n, remote_nsquare);
// Calculate S = E(SUM( (r_i + b_i)^2 ))
- for (i = 0; i < count; i++)
- {
+ for (i = 0; i < count; i++) {
gcry_mpi_add (rand[i], rand[i], b[i]);
}
s = compute_square_sum (rand, count);
// rp, rq, aq, ap, bp, bq are released along with a, r, b respectively, (a and b are handled at except:)
gcry_mpi_release (rand[i]);
- // copy the Kp[], Kq[], S and Stick into a new message
- if (GNUNET_YES != prepare_service_response (r, r_prime, s, s_prime, request, response))
+ // copy the r[], r_prime[], S and Stick into a new message, prepare_service_response frees these
+ if (GNUNET_YES != prepare_service_response (s, s_prime, request))
GNUNET_log (GNUNET_ERROR_TYPE_INFO, _ ("Failed to communicate with `%s', scalar product calculation aborted.\n"),
GNUNET_i2s (&request->peer));
else
ret = GNUNET_OK;
- for (i = 0; i < count; i++)
- {
- gcry_mpi_release (r_prime[i]);
- gcry_mpi_release (r[i]);
- }
-
- gcry_mpi_release (s);
- gcry_mpi_release (s_prime);
-
except:
- for (i = 0; i < count; i++)
- {
+ for (i = 0; i < count; i++) {
gcry_mpi_release (b[i]);
gcry_mpi_release (request->a[i]);
}
return ret;
}
+static void
+prepare_service_request_multipart (void *cls,
+ const struct GNUNET_SCHEDULER_TaskContext *tc)
+{
+ struct ServiceSession * session = cls;
+ unsigned char * current;
+ unsigned char * element_exported;
+ struct GNUNET_SCALARPRODUCT_multipart_message * msg;
+ unsigned int i;
+ unsigned int j;
+ uint32_t msg_length;
+ uint32_t todo_count;
+ size_t element_length = 0; // initialized by gcry_mpi_print, but the compiler doesn't know that
+ gcry_mpi_t a;
+ uint32_t value;
+
+ msg_length = sizeof (struct GNUNET_SCALARPRODUCT_multipart_message);
+ todo_count = session->used_element_count - session->transferred_element_count;
+
+ if (todo_count > MULTIPART_ELEMENT_CAPACITY)
+ // send the currently possible maximum chunk
+ todo_count = MULTIPART_ELEMENT_CAPACITY;
+
+ msg_length += todo_count * PAILLIER_ELEMENT_LENGTH;
+ msg = GNUNET_malloc (msg_length);
+ msg->header.type = htons (GNUNET_MESSAGE_TYPE_SCALARPRODUCT_ALICE_TO_BOB_MULTIPART);
+ msg->header.size = htons (msg_length);
+ msg->multipart_element_count = htonl (todo_count);
+
+ element_exported = GNUNET_malloc (PAILLIER_ELEMENT_LENGTH);
+ a = gcry_mpi_new (KEYBITS * 2);
+ current = (unsigned char *) &msg[1];
+ // encrypt our vector and generate string representations
+ for (i = session->last_processed_element, j = 0; i < session->element_count; i++) {
+ // is this a used element?
+ if (session->mask[i / 8] & 1 << (i % 8)) {
+ if (todo_count <= j)
+ break; //reached end of this message, can't include more
+
+ memset (element_exported, 0, PAILLIER_ELEMENT_LENGTH);
+ value = session->vector[i] >= 0 ? session->vector[i] : -session->vector[i];
+
+ a = gcry_mpi_set_ui (a, 0);
+ // long to gcry_mpi_t
+ if (session->vector[i] < 0)
+ gcry_mpi_sub_ui (a, a, value);
+ else
+ gcry_mpi_add_ui (a, a, value);
+
+ session->a[session->transferred_element_count + j++] = gcry_mpi_set (NULL, a);
+ gcry_mpi_add (a, a, my_offset);
+ encrypt_element (a, a, my_g, my_n, my_nsquare);
+
+ // get representation as string
+ // we always supply some value, so gcry_mpi_print fails only if it can't reserve memory
+ GNUNET_assert (!gcry_mpi_print (GCRYMPI_FMT_USG,
+ element_exported, PAILLIER_ELEMENT_LENGTH,
+ &element_length,
+ a));
+
+ // move buffer content to the end of the buffer so it can easily be read by libgcrypt. also this now has fixed size
+ adjust (element_exported, element_length, PAILLIER_ELEMENT_LENGTH);
+
+ // copy over to the message
+ memcpy (current, element_exported, PAILLIER_ELEMENT_LENGTH);
+ current += PAILLIER_ELEMENT_LENGTH;
+ }
+ }
+ gcry_mpi_release (a);
+ GNUNET_free (element_exported);
+ session->transferred_element_count += todo_count;
+
+ session->msg = (struct GNUNET_MessageHeader *) msg;
+ GNUNET_log (GNUNET_ERROR_TYPE_INFO, _ ("Transmitting service request.\n"));
+
+ //transmit via mesh messaging
+ session->service_transmit_handle = GNUNET_MESH_notify_transmit_ready (session->tunnel, GNUNET_YES,
+ GNUNET_TIME_UNIT_FOREVER_REL,
+ msg_length,
+ &do_send_message,
+ session);
+ if (!session->service_transmit_handle) {
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR, _ ("Could not send service-request multipart message to tunnel!\n"));
+ GNUNET_free (msg);
+ session->msg = NULL;
+ session->client_notification_task =
+ GNUNET_SCHEDULER_add_now (&prepare_client_end_notification,
+ session);
+ return;
+ }
+ if (session->transferred_element_count != session->used_element_count) {
+ session->last_processed_element = i;
+ }
+ else
+ //final part
+ session->state = WAITING_FOR_SERVICE_RESPONSE;
+}
/**
* Executed by Alice, fills in a service-request message and sends it to the given peer
- *
+ *
* @param session the session associated with this request, then also holds the CORE-handle
* @return #GNUNET_SYSERR if we could not send the message
* #GNUNET_NO if the message was too large
{
struct ServiceSession * session = cls;
unsigned char * current;
+ unsigned char * element_exported;
struct GNUNET_SCALARPRODUCT_service_request * msg;
unsigned int i;
unsigned int j;
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, _ ("Successfully created new tunnel to peer (%s)!\n"), GNUNET_i2s (&session->peer));
msg_length = sizeof (struct GNUNET_SCALARPRODUCT_service_request)
- +session->used_element_count * PAILLIER_ELEMENT_LENGTH
- + session->mask_length
+ +session->mask_length
+ my_pubkey_external_length;
- if (GNUNET_SERVER_MAX_MESSAGE_SIZE < sizeof (struct GNUNET_SCALARPRODUCT_service_request)
- +session->used_element_count * PAILLIER_ELEMENT_LENGTH
- + session->mask_length
- + my_pubkey_external_length)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_WARNING, _ ("Message too large, fragmentation is currently not supported!\n"));
- session->client_notification_task =
- GNUNET_SCHEDULER_add_now (&prepare_client_end_notification,
- session);
- return;
+ if (GNUNET_SERVER_MAX_MESSAGE_SIZE > msg_length + session->used_element_count * PAILLIER_ELEMENT_LENGTH) {
+ msg_length += session->used_element_count * PAILLIER_ELEMENT_LENGTH;
+ session->transferred_element_count = session->used_element_count;
+ }
+ else {
+ //create a multipart msg, first we calculate a new msg size for the head msg
+ session->transferred_element_count = (GNUNET_SERVER_MAX_MESSAGE_SIZE - 1 - msg_length) / PAILLIER_ELEMENT_LENGTH;
}
msg = GNUNET_malloc (msg_length);
msg->header.type = htons (GNUNET_MESSAGE_TYPE_SCALARPRODUCT_ALICE_TO_BOB);
+ msg->total_element_count = htonl (session->used_element_count);
+ msg->contained_element_count = htonl (session->transferred_element_count);
memcpy (&msg->key, &session->key, sizeof (struct GNUNET_HashCode));
msg->mask_length = htonl (session->mask_length);
msg->pk_length = htonl (my_pubkey_external_length);
- msg->used_element_count = htonl (session->used_element_count);
msg->element_count = htonl (session->element_count);
msg->header.size = htons (msg_length);
current += my_pubkey_external_length;
// now copy over the element vector
+ element_exported = GNUNET_malloc (PAILLIER_ELEMENT_LENGTH);
session->a = GNUNET_malloc (sizeof (gcry_mpi_t) * session->used_element_count);
a = gcry_mpi_new (KEYBITS * 2);
// encrypt our vector and generate string representations
- for (i = 0, j = 0; i < session->element_count; i++)
- {
+ for (i = 0, j = 0; i < session->element_count; i++) {
// if this is a used element...
- if (session->mask[i / 8] & 1 << (i % 8))
- {
- unsigned char * element_exported = GNUNET_malloc (PAILLIER_ELEMENT_LENGTH);
+ if (session->mask[i / 8] & 1 << (i % 8)) {
+ if (session->transferred_element_count <= j)
+ break; //reached end of this message, can't include more
+
+ memset (element_exported, 0, PAILLIER_ELEMENT_LENGTH);
value = session->vector[i] >= 0 ? session->vector[i] : -session->vector[i];
a = gcry_mpi_set_ui (a, 0);
}
}
gcry_mpi_release (a);
+ GNUNET_free (element_exported);
session->msg = (struct GNUNET_MessageHeader *) msg;
GNUNET_log (GNUNET_ERROR_TYPE_INFO, _ ("Transmitting service request.\n"));
msg_length,
&do_send_message,
session);
- if (!session->service_transmit_handle)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_ERROR, _ ("Could not send mutlicast message to tunnel!\n"));
+ if (!session->service_transmit_handle) {
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR, _ ("Could not send message to tunnel!\n"));
GNUNET_free (msg);
session->msg = NULL;
session->client_notification_task =
session);
return;
}
- session->state = WAITING_FOR_SERVICE_RESPONSE;
+ if (session->transferred_element_count != session->used_element_count) {
+ session->state = WAITING_FOR_MULTIPART_TRANSMISSION;
+ session->last_processed_element = i;
+ }
+ else
+ //singlepart message
+ session->state = WAITING_FOR_SERVICE_RESPONSE;
}
-
/**
- * Handler for a client request message.
+ * Handler for a client request message.
* Can either be type A or B
* A: request-initiation to compute a scalar product with a peer
- * B: response role, keep the values + session and wait for a matching session or process a waiting request
+ * B: response role, keep the values + session and wait for a matching session or process a waiting request
*
* @param cls closure
* @param client identification of the client
// only one concurrent session per client connection allowed, simplifies logics a lot...
session = GNUNET_SERVER_client_get_user_context (client, struct ServiceSession);
- if ((NULL != session) && (session->state != FINALIZED))
- {
+ if ((NULL != session) && (session->state != FINALIZED)) {
GNUNET_SERVER_receive_done (client, GNUNET_OK);
return;
}
- else if (NULL != session)
- {
+ else if (NULL != session) {
// old session is already completed, clean it up
GNUNET_CONTAINER_DLL_remove (from_client_head, from_client_tail, session);
free_session (session);
}
//we need at least a peer and one message id to compare
- if (sizeof (struct GNUNET_SCALARPRODUCT_client_request) > ntohs (msg->header.size))
- {
+ if (sizeof (struct GNUNET_SCALARPRODUCT_client_request) > ntohs (msg->header.size)) {
GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
_ ("Too short message received from client!\n"));
GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
//sanity check: is the message as long as the message_count fields suggests?
if ((ntohs (msg->header.size) != (sizeof (struct GNUNET_SCALARPRODUCT_client_request) +element_count * sizeof (int32_t) + mask_length))
- || (0 == element_count))
- {
+ || (0 == element_count)) {
GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
_ ("Invalid message received from client, session information incorrect!\n"));
GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
if (NULL != find_matching_session (from_client_tail,
&msg->key,
element_count,
- NULL, NULL))
- {
+ NULL, NULL)) {
GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
_ ("Duplicate session information received, cannot create new session with key `%s'\n"),
GNUNET_h2s (&msg->key));
session->vector = GNUNET_malloc (sizeof (int32_t) * element_count);
vector = (int32_t *) & msg[1];
- if (GNUNET_MESSAGE_TYPE_SCALARPRODUCT_CLIENT_TO_ALICE == msg_type)
- {
+ if (GNUNET_MESSAGE_TYPE_SCALARPRODUCT_CLIENT_TO_ALICE == msg_type) {
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
_ ("Got client-request-session with key %s, preparing tunnel to remote service.\n"),
GNUNET_h2s (&session->key));
// copy over the elements
session->used_element_count = 0;
- for (i = 0; i < element_count; i++)
- {
+ for (i = 0; i < element_count; i++) {
session->vector[i] = ntohl (vector[i]);
if (session->vector[i] == 0)
session->mask[i / 8] &= ~(1 << (i % 8));
session->used_element_count++;
}
- if (0 == session->used_element_count)
- {
+ if (0 == session->used_element_count) {
GNUNET_break_op (0);
GNUNET_free (session->vector);
GNUNET_free (session);
return;
}
//session with ourself makes no sense!
- if (!memcmp (&msg->peer, &me, sizeof (struct GNUNET_PeerIdentity)))
- {
+ if (!memcmp (&msg->peer, &me, sizeof (struct GNUNET_PeerIdentity))) {
GNUNET_break (0);
GNUNET_free (session->vector);
GNUNET_free (session);
GNUNET_NO,
GNUNET_YES);
//prepare_service_request, tunnel_peer_disconnect_handler,
- if (!session->tunnel)
- {
+ if (!session->tunnel) {
GNUNET_break (0);
GNUNET_free (session->vector);
GNUNET_free (session);
session);
}
- else
- {
+ else {
struct ServiceSession * requesting_session;
enum SessionState needed_state = SERVICE_REQUEST_RECEIVED;
GNUNET_SERVER_client_set_user_context (client, session);
GNUNET_CONTAINER_DLL_insert (from_client_head, from_client_tail, session);
- //check if service queue contains a matching request
+ //check if service queue contains a matching request
requesting_session = find_matching_session (from_service_tail,
&session->key,
session->element_count,
&needed_state, NULL);
- if (NULL != requesting_session)
- {
+ if (NULL != requesting_session) {
GNUNET_log (GNUNET_ERROR_TYPE_INFO, _ ("Got client-responder-session with key %s and a matching service-request-session set, processing.\n"), GNUNET_h2s (&session->key));
if (GNUNET_OK != compute_service_response (requesting_session, session))
session->client_notification_task =
session);
}
- else
- {
+ else {
GNUNET_log (GNUNET_ERROR_TYPE_INFO, _ ("Got client-responder-session with key %s but NO matching service-request-session set, queuing element for later use.\n"), GNUNET_h2s (&session->key));
// no matching session exists yet, store the response
// for later processing by handle_service_request()
GNUNET_SERVER_receive_done (client, GNUNET_YES);
}
-
/**
- * Function called for inbound tunnels.
+ * Function called for inbound tunnels.
*
* @param cls closure
* @param tunnel new handle to the tunnel
return c;
}
-
/**
* Function called whenever a tunnel is destroyed. Should clean up
- * any associated state.
- *
+ * any associated state.
+ *
* It must NOT call GNUNET_MESH_tunnel_destroy on the tunnel.
*
* @param cls closure (set from GNUNET_MESH_connect)
_ ("Peer disconnected, terminating session %s with peer (%s)\n"),
GNUNET_h2s (&session->key),
GNUNET_i2s (&session->peer));
- if (ALICE == session->role)
- {
+ if (ALICE == session->role) {
// as we have only one peer connected in each session, just remove the session
- if ((SERVICE_RESPONSE_RECEIVED > session->state) && (!do_shutdown))
- {
+ if ((SERVICE_RESPONSE_RECEIVED > session->state) && (!do_shutdown)) {
session->tunnel = NULL;
// if this happened before we received the answer, we must terminate the session
session->client_notification_task =
session);
}
}
- else
- { //(BOB == session->role) service session
+ else { //(BOB == session->role) service session
// remove the session, unless it has already been dequeued, but somehow still active
// this could bug without the IF in case the queue is empty and the service session was the only one know to the service
// scenario: disconnect before alice can send her message to bob.
for (curr = from_service_head; NULL != curr; curr = curr->next)
- if (curr == session)
- {
+ if (curr == session) {
GNUNET_CONTAINER_DLL_remove (from_service_head, from_service_tail, curr);
break;
}
NULL, NULL);
free_session (session);
- // the client has to check if it was waiting for a result
+ // the client has to check if it was waiting for a result
// or if it was a responder, no point in adding more statefulness
- if (client_session && (!do_shutdown))
- {
+ if (client_session && (!do_shutdown)) {
client_session->state = FINALIZED;
client_session->client_notification_task =
GNUNET_SCHEDULER_add_now (&prepare_client_end_notification,
}
}
-
/**
* Compute our scalar product, done by Alice
- *
+ *
* @param session - the session associated with this computation
- * @param kp - (1) from the protocol definition:
+ * @param kp - (1) from the protocol definition:
* $E_A(a_{\pi(i)}) \otimes E_A(- r_{\pi(i)} - b_{\pi(i)}) &= E_A(a_{\pi(i)} - r_{\pi(i)} - b_{\pi(i)})$
- * @param kq - (2) from the protocol definition:
+ * @param kq - (2) from the protocol definition:
* $E_A(a_{\pi'(i)}) \otimes E_A(- r_{\pi'(i)}) &= E_A(a_{\pi'(i)} - r_{\pi'(i)})$
- * @param s - S from the protocol definition:
+ * @param s - S from the protocol definition:
* $S := E_A(\sum (r_i + b_i)^2)$
- * @param stick - S' from the protocol definition:
+ * @param stick - S' from the protocol definition:
* $S' := E_A(\sum r_i^2)$
* @return product as MPI, never NULL
*/
static gcry_mpi_t
-compute_scalar_product (struct ServiceSession * session,
- gcry_mpi_t * r, gcry_mpi_t * r_prime, gcry_mpi_t s, gcry_mpi_t s_prime)
+compute_scalar_product (struct ServiceSession * session)
{
uint32_t count;
gcry_mpi_t t;
// due to the introduced static offset S, we now also have to remove this
// from the E(a_pi)(+)E(-b_pi-r_pi) and E(a_qi)(+)E(-r_qi) twice each,
// the result is E((S + a_pi) + (S -b_pi-r_pi)) and E(S + a_qi + S - r_qi)
- for (i = 0; i < count; i++)
- {
- decrypt_element (r[i], r[i], my_mu, my_lambda, my_n, my_nsquare);
- gcry_mpi_sub (r[i], r[i], my_offset);
- gcry_mpi_sub (r[i], r[i], my_offset);
- decrypt_element (r_prime[i], r_prime[i], my_mu, my_lambda, my_n, my_nsquare);
- gcry_mpi_sub (r_prime[i], r_prime[i], my_offset);
- gcry_mpi_sub (r_prime[i], r_prime[i], my_offset);
+ for (i = 0; i < count; i++) {
+ decrypt_element (session->r[i], session->r[i], my_mu, my_lambda, my_n, my_nsquare);
+ gcry_mpi_sub (session->r[i], session->r[i], my_offset);
+ gcry_mpi_sub (session->r[i], session->r[i], my_offset);
+ decrypt_element (session->r_prime[i], session->r_prime[i], my_mu, my_lambda, my_n, my_nsquare);
+ gcry_mpi_sub (session->r_prime[i], session->r_prime[i], my_offset);
+ gcry_mpi_sub (session->r_prime[i], session->r_prime[i], my_offset);
}
// calculate t = sum(ai)
// calculate U
u = gcry_mpi_new (0);
- tmp = compute_square_sum (r, count);
+ tmp = compute_square_sum (session->r, count);
gcry_mpi_sub (u, u, tmp);
gcry_mpi_release (tmp);
//calculate U'
utick = gcry_mpi_new (0);
- tmp = compute_square_sum (r_prime, count);
+ tmp = compute_square_sum (session->r_prime, count);
gcry_mpi_sub (utick, utick, tmp);
GNUNET_assert (p = gcry_mpi_new (0));
GNUNET_assert (ptick = gcry_mpi_new (0));
// compute P
- decrypt_element (s, s, my_mu, my_lambda, my_n, my_nsquare);
- decrypt_element (s_prime, s_prime, my_mu, my_lambda, my_n, my_nsquare);
+ decrypt_element (session->s, session->s, my_mu, my_lambda, my_n, my_nsquare);
+ decrypt_element (session->s_prime, session->s_prime, my_mu, my_lambda, my_n, my_nsquare);
// compute P
- gcry_mpi_add (p, s, t);
+ gcry_mpi_add (p, session->s, t);
gcry_mpi_add (p, p, u);
// compute P'
- gcry_mpi_add (ptick, s_prime, t);
+ gcry_mpi_add (ptick, session->s_prime, t);
gcry_mpi_add (ptick, ptick, utick);
gcry_mpi_release (t);
return p;
}
-
/**
* prepare the response we will send to alice or bobs' clients.
- * in Bobs case the product will be NULL.
- *
+ * in Bobs case the product will be NULL.
+ *
* @param session the session associated with our client.
*/
static void
session->client_notification_task = GNUNET_SCHEDULER_NO_TASK;
- if (session->product)
- {
+ if (session->product) {
gcry_mpi_t value = gcry_mpi_new (0);
sign = gcry_mpi_cmp_ui (session->product, 0);
// libgcrypt can not handle a print of a negative number
// if (a->sign) return gcry_error (GPG_ERR_INTERNAL); /* Can't handle it yet. */
- if (0 > sign)
- {
+ if (0 > sign) {
gcry_mpi_sub (value, value, session->product);
}
- else if (0 < sign)
- {
+ else if (0 < sign) {
range = 1;
gcry_mpi_add (value, value, session->product);
}
&& (0 != (rc = gcry_mpi_aprint (GCRYMPI_FMT_STD,
&product_exported,
&product_length,
- value))))
- {
+ value)))) {
LOG_GCRY (GNUNET_ERROR_TYPE_ERROR, "gcry_mpi_scan", rc);
product_length = 0;
range = -1; // signal error with product-length = 0 and range = -1
msg = GNUNET_malloc (msg_length);
memcpy (&msg->key, &session->key, sizeof (struct GNUNET_HashCode));
memcpy (&msg->peer, &session->peer, sizeof ( struct GNUNET_PeerIdentity));
- if (product_exported != NULL)
- {
+ if (product_exported != NULL) {
memcpy (&msg[1], product_exported, product_length);
GNUNET_free (product_exported);
}
GNUNET_TIME_UNIT_FOREVER_REL,
&do_send_message,
session);
- if (NULL == session->client_transmit_handle)
- {
+ if (NULL == session->client_transmit_handle) {
GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
_ ("Could not send message to client (%p)!\n"),
session->client);
GNUNET_h2s (&session->key));
}
+/**
+ * Handle a multipart-chunk of a request from another service to calculate a scalarproduct with us.
+ *
+ * @param cls closure (set from #GNUNET_MESH_connect)
+ * @param tunnel connection to the other end
+ * @param tunnel_ctx place to store local state associated with the tunnel
+ * @param sender who sent the message
+ * @param message the actual message
+ * @param atsi performance data for the connection
+ * @return #GNUNET_OK to keep the connection open,
+ * #GNUNET_SYSERR to close it (signal serious error)
+ */
+static int
+handle_service_request_multipart (void *cls,
+ struct GNUNET_MESH_Tunnel * tunnel,
+ void **tunnel_ctx,
+ const struct GNUNET_MessageHeader * message)
+{
+ struct ServiceSession * session;
+ const struct GNUNET_SCALARPRODUCT_multipart_message * msg = (const struct GNUNET_SCALARPRODUCT_multipart_message *) message;
+ uint32_t used_elements;
+ uint32_t contained_elements=0;
+ uint32_t msg_length;
+ unsigned char * current;
+ int32_t i = -1;
+
+ // are we in the correct state?
+ session = (struct ServiceSession *) * tunnel_ctx;
+ if ((BOB != session->role) || (WAITING_FOR_MULTIPART_TRANSMISSION != session->state)) {
+ GNUNET_break_op (0);
+ return GNUNET_OK;
+ }
+ // shorter than minimum?
+ if (ntohs (msg->header.size) <= sizeof (struct GNUNET_SCALARPRODUCT_multipart_message)) {
+ goto except;
+ }
+ used_elements = session->used_element_count;
+ contained_elements = ntohl (msg->multipart_element_count);
+ msg_length = sizeof (struct GNUNET_SCALARPRODUCT_multipart_message)
+ + contained_elements * PAILLIER_ELEMENT_LENGTH;
+ //sanity check
+ if (( ntohs (msg->header.size) != msg_length)
+ || (used_elements < contained_elements + session->transferred_element_count)) {
+ goto except;
+ }
+ current = (unsigned char *) &msg[1];
+ if (contained_elements != 0) {
+ gcry_error_t ret = 0;
+ // Convert each vector element to MPI_value
+ for (i = session->transferred_element_count; i < session->transferred_element_count+contained_elements; i++) {
+ size_t read = 0;
+
+ ret = gcry_mpi_scan (&session->a[i],
+ GCRYMPI_FMT_USG,
+ ¤t[i * PAILLIER_ELEMENT_LENGTH],
+ PAILLIER_ELEMENT_LENGTH,
+ &read);
+ if (ret) {
+ GNUNET_log (GNUNET_ERROR_TYPE_WARNING, _ ("Could not translate E[a%d] to MPI!\n%s/%s\n"),
+ i, gcry_strsource (ret), gcry_strerror (ret));
+ goto except;
+ }
+ }
+ session->transferred_element_count+=contained_elements;
+
+ if (session->transferred_element_count == used_elements) {
+ // single part finished
+ session->state = SERVICE_REQUEST_RECEIVED;
+ if (session->response) {
+ GNUNET_log (GNUNET_ERROR_TYPE_INFO, _ ("Got session with key %s and a matching element set, processing.\n"), GNUNET_h2s (&session->key));
+ if (GNUNET_OK != compute_service_response (session, session->response)) {
+ //something went wrong, remove it again...
+ GNUNET_CONTAINER_DLL_remove (from_service_head, from_service_tail, session);
+ goto except;
+ }
+ }
+ else
+ GNUNET_log (GNUNET_ERROR_TYPE_INFO, _ ("Got session with key %s without a matching element set, queueing.\n"), GNUNET_h2s (&session->key));
+ }
+ else{
+ // multipart message
+ }
+ }
+
+ return GNUNET_OK;
+except:
+ for (i = 0; i < session->transferred_element_count + contained_elements; i++)
+ if (session->a[i])
+ gcry_mpi_release (session->a[i]);
+ gcry_sexp_release (session->remote_pubkey);
+ session->remote_pubkey = NULL;
+ GNUNET_free (session->a);
+ session->a = NULL;
+ free_session (session);
+ // and notify our client-session that we could not complete the session
+ if (session->response)
+ // we just found the responder session in this queue
+ session->response->client_notification_task =
+ GNUNET_SCHEDULER_add_now (&prepare_client_end_notification,
+ session->response);
+ return GNUNET_SYSERR;
+}
/**
* Handle a request from another service to calculate a scalarproduct with us.
uint32_t mask_length;
uint32_t pk_length;
uint32_t used_elements;
+ uint32_t contained_elements;
uint32_t element_count;
uint32_t msg_length;
unsigned char * current;
- struct ServiceSession * responder_session;
int32_t i = -1;
enum SessionState needed_state;
session = (struct ServiceSession *) * tunnel_ctx;
- if (BOB != session->role)
- {
- GNUNET_break_op (0);
- return GNUNET_SYSERR;
- }
- // is this tunnel already in use?
- if ((session->next) || (from_service_head == session))
- {
+ if (WAITING_FOR_SERVICE_REQUEST != session->state) {
GNUNET_break_op (0);
- return GNUNET_SYSERR;
+ return GNUNET_OK;
}
// Check if message was sent by me, which would be bad!
- if (!memcmp (&session->peer, &me, sizeof (struct GNUNET_PeerIdentity)))
- {
+ if (!memcmp (&session->peer, &me, sizeof (struct GNUNET_PeerIdentity))) {
GNUNET_free (session);
GNUNET_break (0);
return GNUNET_SYSERR;
}
-
- //we need at least a peer and one message id to compare
- if (ntohs (msg->header.size) < sizeof (struct GNUNET_SCALARPRODUCT_service_request))
- {
+ // shorter than expected?
+ if (ntohs (msg->header.size) < sizeof (struct GNUNET_SCALARPRODUCT_service_request)) {
GNUNET_free (session);
GNUNET_break_op (0);
return GNUNET_SYSERR;
}
mask_length = ntohl (msg->mask_length);
pk_length = ntohl (msg->pk_length);
- used_elements = ntohl (msg->used_element_count);
+ used_elements = ntohl (msg->total_element_count);
+ contained_elements = ntohl (msg->contained_element_count);
element_count = ntohl (msg->element_count);
msg_length = sizeof (struct GNUNET_SCALARPRODUCT_service_request)
- +mask_length + pk_length + used_elements * PAILLIER_ELEMENT_LENGTH;
+ +mask_length + pk_length + contained_elements * PAILLIER_ELEMENT_LENGTH;
//sanity check: is the message as long as the message_count fields suggests?
- if ((ntohs (msg->header.size) != msg_length) || (element_count < used_elements)
+ if ((ntohs (msg->header.size) != msg_length) || (element_count < used_elements) || (used_elements < contained_elements)
|| (used_elements == 0) || (mask_length != (element_count / 8 + (element_count % 8 ? 1 : 0)))
- )
- {
+ ) {
GNUNET_free (session);
GNUNET_break_op (0);
return GNUNET_SYSERR;
&msg->key,
element_count,
NULL,
- NULL))
- {
+ NULL)) {
GNUNET_log (GNUNET_ERROR_TYPE_ERROR, _ ("Got message with duplicate session key (`%s'), ignoring service request.\n"), (const char *) &(msg->key));
GNUNET_free (session);
return GNUNET_SYSERR;
}
memcpy (&session->peer, &session->peer, sizeof (struct GNUNET_PeerIdentity));
- session->state = SERVICE_REQUEST_RECEIVED;
- session->element_count = ntohl (msg->element_count);
+ session->element_count = element_count;
session->used_element_count = used_elements;
+ session->transferred_element_count = contained_elements;
session->tunnel = tunnel;
// session key
current += mask_length;
//convert the publickey to sexp
- if (gcry_sexp_new (&session->remote_pubkey, current, pk_length, 1))
- {
+ if (gcry_sexp_new (&session->remote_pubkey, current, pk_length, 1)) {
GNUNET_log (GNUNET_ERROR_TYPE_WARNING, _ ("Could not translate remote public key to sexpression!\n"));
GNUNET_free (session->mask);
GNUNET_free (session);
current += pk_length;
- //check if service queue contains a matching request
+ //check if service queue contains a matching request
needed_state = CLIENT_RESPONSE_RECEIVED;
- responder_session = find_matching_session (from_client_tail,
+ session->response = find_matching_session (from_client_tail,
&session->key,
session->element_count,
&needed_state, NULL);
session->a = GNUNET_malloc (sizeof (gcry_mpi_t) * used_elements);
-
- if (GNUNET_SERVER_MAX_MESSAGE_SIZE >= sizeof (struct GNUNET_SCALARPRODUCT_service_request)
- +pk_length
- + mask_length
- + used_elements * PAILLIER_ELEMENT_LENGTH)
- {
+ session->state = WAITING_FOR_MULTIPART_TRANSMISSION;
+ if (contained_elements != 0) {
gcry_error_t ret = 0;
- session->a = GNUNET_malloc (sizeof (gcry_mpi_t) * used_elements);
// Convert each vector element to MPI_value
- for (i = 0; i < used_elements; i++)
- {
+ for (i = 0; i < contained_elements; i++) {
size_t read = 0;
ret = gcry_mpi_scan (&session->a[i],
¤t[i * PAILLIER_ELEMENT_LENGTH],
PAILLIER_ELEMENT_LENGTH,
&read);
- if (ret)
- {
+ if (ret) {
GNUNET_log (GNUNET_ERROR_TYPE_WARNING, _ ("Could not translate E[a%d] to MPI!\n%s/%s\n"),
i, gcry_strsource (ret), gcry_strerror (ret));
goto except;
}
}
GNUNET_CONTAINER_DLL_insert (from_service_head, from_service_tail, session);
- if (responder_session)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_INFO, _ ("Got session with key %s and a matching element set, processing.\n"), GNUNET_h2s (&session->key));
- if (GNUNET_OK != compute_service_response (session, responder_session))
- {
- //something went wrong, remove it again...
- GNUNET_CONTAINER_DLL_remove (from_service_head, from_service_tail, session);
- goto except;
+
+ if (contained_elements == used_elements) {
+ // single part finished
+ session->state = SERVICE_REQUEST_RECEIVED;
+ if (session->response) {
+ GNUNET_log (GNUNET_ERROR_TYPE_INFO, _ ("Got session with key %s and a matching element set, processing.\n"), GNUNET_h2s (&session->key));
+ if (GNUNET_OK != compute_service_response (session, session->response)) {
+ //something went wrong, remove it again...
+ GNUNET_CONTAINER_DLL_remove (from_service_head, from_service_tail, session);
+ goto except;
+ }
}
+ else
+ GNUNET_log (GNUNET_ERROR_TYPE_INFO, _ ("Got session with key %s without a matching element set, queueing.\n"), GNUNET_h2s (&session->key));
+ }
+ else{
+ // multipart message
}
- else
- GNUNET_log (GNUNET_ERROR_TYPE_INFO, _ ("Got session with key %s without a matching element set, queueing.\n"), GNUNET_h2s (&session->key));
-
- return GNUNET_OK;
- }
- else
- {
- // TODO FEATURE: fallback to fragmentation, in case the message is too long
- GNUNET_log (GNUNET_ERROR_TYPE_WARNING, _ ("Message too large, fragmentation is currently not supported!\n"));
- goto except;
}
+ return GNUNET_OK;
except:
- for (i = 0; i < used_elements; i++)
+ for (i = 0; i < contained_elements; i++)
if (session->a[i])
gcry_mpi_release (session->a[i]);
gcry_sexp_release (session->remote_pubkey);
session->remote_pubkey = NULL;
- GNUNET_free_non_null (session->a);
+ GNUNET_free (session->a);
session->a = NULL;
free_session (session);
// and notify our client-session that we could not complete the session
- if (responder_session)
+ if (session->response)
// we just found the responder session in this queue
- responder_session->client_notification_task =
+ session->response->client_notification_task =
GNUNET_SCHEDULER_add_now (&prepare_client_end_notification,
- responder_session);
+ session->response);
return GNUNET_SYSERR;
}
+/**
+ * Handle a multipart chunk of a response we got from another service we wanted to calculate a scalarproduct with.
+ *
+ * @param cls closure (set from #GNUNET_MESH_connect)
+ * @param tunnel connection to the other end
+ * @param tunnel_ctx place to store local state associated with the tunnel
+ * @param sender who sent the message
+ * @param message the actual message
+ * @param atsi performance data for the connection
+ * @return #GNUNET_OK to keep the connection open,
+ * #GNUNET_SYSERR to close it (signal serious error)
+ */
+static int
+handle_service_response_multipart (void *cls,
+ struct GNUNET_MESH_Tunnel * tunnel,
+ void **tunnel_ctx,
+ const struct GNUNET_MessageHeader * message)
+{
+ struct ServiceSession * session;
+ const struct GNUNET_SCALARPRODUCT_multipart_message * msg = (const struct GNUNET_SCALARPRODUCT_multipart_message *) message;
+ unsigned char * current;
+ size_t read;
+ size_t i;
+ uint32_t contained_element_count=0;
+ size_t msg_size;
+ int rc;
+
+ GNUNET_assert (NULL != message);
+ // are we in the correct state?
+ session = (struct ServiceSession *) * tunnel_ctx;
+ if ((ALICE != session->role) || (WAITING_FOR_MULTIPART_TRANSMISSION != session->state)) {
+ GNUNET_break_op (0);
+ return GNUNET_OK;
+ }
+ // shorter than minimum?
+ if (ntohs (msg->header.size) <= sizeof (struct GNUNET_SCALARPRODUCT_multipart_message)) {
+ goto except;
+ }
+ contained_element_count = ntohl (msg->multipart_element_count);
+ msg_size = sizeof (struct GNUNET_SCALARPRODUCT_multipart_message)
+ + 2 * contained_element_count * PAILLIER_ELEMENT_LENGTH;
+ //sanity check: is the message as long as the message_count fields suggests?
+ if ((ntohs (msg->header.size) != msg_size) || (session->used_element_count < contained_element_count)) {
+ goto except;
+ }
+ current = (unsigned char *) &msg[1];
+ // Convert each k[][perm] to its MPI_value
+ for (i = 0; i < contained_element_count; i++) {
+ if (0 != (rc = gcry_mpi_scan (&session->r[i], GCRYMPI_FMT_USG, current,
+ PAILLIER_ELEMENT_LENGTH, &read))) {
+ LOG_GCRY (GNUNET_ERROR_TYPE_DEBUG, "gcry_mpi_scan", rc);
+ GNUNET_break_op (0);
+ goto except;
+ }
+ current += PAILLIER_ELEMENT_LENGTH;
+ if (0 != (rc = gcry_mpi_scan (&session->r_prime[i], GCRYMPI_FMT_USG, current,
+ PAILLIER_ELEMENT_LENGTH, &read))) {
+ LOG_GCRY (GNUNET_ERROR_TYPE_DEBUG, "gcry_mpi_scan", rc);
+ GNUNET_break_op (0);
+ goto except;
+ }
+ current += PAILLIER_ELEMENT_LENGTH;
+ }
+ session->transferred_element_count += contained_element_count;
+ if (session->transferred_element_count != session->used_element_count)
+ return GNUNET_OK;
+ session->state = SERVICE_RESPONSE_RECEIVED;
+ session->product = compute_scalar_product (session);
+ return GNUNET_SYSERR; // terminate the tunnel right away, we are done here!
+except:
+ GNUNET_break_op (0);
+ if (session->s)
+ gcry_mpi_release (session->s);
+ if (session->s_prime)
+ gcry_mpi_release (session->s_prime);
+ for (i = 0; session->r && i < session->transferred_element_count; i++)
+ if (session->r[i]) gcry_mpi_release (session->r[i]);
+ for (i = 0; session->r_prime && i < session->transferred_element_count; i++)
+ if (session->r_prime[i]) gcry_mpi_release (session->r_prime[i]);
+ GNUNET_free_non_null (session->r);
+ GNUNET_free_non_null (session->r_prime);
+
+ session->tunnel = NULL;
+ // send message with product to client
+ session->client_notification_task =
+ GNUNET_SCHEDULER_add_now (&prepare_client_response,
+ session);
+ // the tunnel has done its job, terminate our connection and the tunnel
+ // the peer will be notified that the tunnel was destroyed via tunnel_destruction_handler
+ // just close the connection, as recommended by Christian
+ return GNUNET_SYSERR;
+}
/**
* Handle a response we got from another service we wanted to calculate a scalarproduct with.
struct ServiceSession * session;
const struct GNUNET_SCALARPRODUCT_service_response * msg = (const struct GNUNET_SCALARPRODUCT_service_response *) message;
unsigned char * current;
- uint32_t count;
- gcry_mpi_t s = NULL;
- gcry_mpi_t s_prime = NULL;
size_t read;
size_t i;
- uint32_t used_element_count;
+ uint32_t contained_element_count=0;
size_t msg_size;
- gcry_mpi_t * r = NULL;
- gcry_mpi_t * r_prime = NULL;
int rc;
GNUNET_assert (NULL != message);
session = (struct ServiceSession *) * tunnel_ctx;
- if (ALICE != session->role)
- {
+ if (session->state != WAITING_FOR_SERVICE_REQUEST) {
GNUNET_break_op (0);
- return GNUNET_SYSERR;
+ return GNUNET_OK;
}
-
- count = session->used_element_count;
- session->product = NULL;
- session->state = SERVICE_RESPONSE_RECEIVED;
-
- //we need at least a peer and one message id to compare
- if (sizeof (struct GNUNET_SCALARPRODUCT_service_response) > ntohs (msg->header.size))
- {
+ //we need at least a full message
+ if (sizeof (struct GNUNET_SCALARPRODUCT_service_response) > ntohs (msg->header.size)) {
GNUNET_break_op (0);
goto invalid_msg;
}
- used_element_count = ntohl (msg->used_element_count);
+ contained_element_count = ntohl (msg->contained_element_count);
msg_size = sizeof (struct GNUNET_SCALARPRODUCT_service_response)
- + 2 * used_element_count * PAILLIER_ELEMENT_LENGTH
+ + 2 * contained_element_count * PAILLIER_ELEMENT_LENGTH
+ 2 * PAILLIER_ELEMENT_LENGTH;
//sanity check: is the message as long as the message_count fields suggests?
- if ((ntohs (msg->header.size) != msg_size) || (count != used_element_count))
- {
+ if ((ntohs (msg->header.size) != msg_size) || (session->used_element_count < contained_element_count)) {
GNUNET_break_op (0);
goto invalid_msg;
}
-
+ session->state = WAITING_FOR_MULTIPART_TRANSMISSION;
+ session->transferred_element_count = contained_element_count;
//convert s
current = (unsigned char *) &msg[1];
- if (0 != (rc = gcry_mpi_scan (&s, GCRYMPI_FMT_USG, current,
- PAILLIER_ELEMENT_LENGTH, &read)))
- {
+ if (0 != (rc = gcry_mpi_scan (&session->s, GCRYMPI_FMT_USG, current,
+ PAILLIER_ELEMENT_LENGTH, &read))) {
LOG_GCRY (GNUNET_ERROR_TYPE_DEBUG, "gcry_mpi_scan", rc);
GNUNET_break_op (0);
goto invalid_msg;
}
current += PAILLIER_ELEMENT_LENGTH;
//convert stick
- if (0 != (rc = gcry_mpi_scan (&s_prime, GCRYMPI_FMT_USG, current,
- PAILLIER_ELEMENT_LENGTH, &read)))
- {
+ if (0 != (rc = gcry_mpi_scan (&session->s_prime, GCRYMPI_FMT_USG, current,
+ PAILLIER_ELEMENT_LENGTH, &read))) {
LOG_GCRY (GNUNET_ERROR_TYPE_DEBUG, "gcry_mpi_scan", rc);
GNUNET_break_op (0);
goto invalid_msg;
}
current += PAILLIER_ELEMENT_LENGTH;
-
- r = GNUNET_malloc (sizeof (gcry_mpi_t) * count);
- // Convert each kp[] to its MPI_value
- for (i = 0; i < count; i++)
- {
- if (0 != (rc = gcry_mpi_scan (&r[i], GCRYMPI_FMT_USG, current,
- PAILLIER_ELEMENT_LENGTH, &read)))
- {
+ session->r = GNUNET_malloc (sizeof (gcry_mpi_t) * session->used_element_count);
+ session->r_prime = GNUNET_malloc (sizeof (gcry_mpi_t) * session->used_element_count);
+ // Convert each k[][perm] to its MPI_value
+ for (i = 0; i < contained_element_count; i++) {
+ if (0 != (rc = gcry_mpi_scan (&session->r[i], GCRYMPI_FMT_USG, current,
+ PAILLIER_ELEMENT_LENGTH, &read))) {
LOG_GCRY (GNUNET_ERROR_TYPE_DEBUG, "gcry_mpi_scan", rc);
GNUNET_break_op (0);
goto invalid_msg;
}
current += PAILLIER_ELEMENT_LENGTH;
- }
-
-
- r_prime = GNUNET_malloc (sizeof (gcry_mpi_t) * count);
- // Convert each kq[] to its MPI_value
- for (i = 0; i < count; i++)
- {
- if (0 != (rc = gcry_mpi_scan (&r_prime[i], GCRYMPI_FMT_USG, current,
- PAILLIER_ELEMENT_LENGTH, &read)))
- {
+ if (0 != (rc = gcry_mpi_scan (&session->r_prime[i], GCRYMPI_FMT_USG, current,
+ PAILLIER_ELEMENT_LENGTH, &read))) {
LOG_GCRY (GNUNET_ERROR_TYPE_DEBUG, "gcry_mpi_scan", rc);
GNUNET_break_op (0);
goto invalid_msg;
}
current += PAILLIER_ELEMENT_LENGTH;
}
- session->product = compute_scalar_product (session, r, r_prime, s, s_prime);
+ if (session->transferred_element_count != session->used_element_count)
+ return GNUNET_OK; //wait for the other multipart chunks
+
+ session->state = SERVICE_RESPONSE_RECEIVED;
+ session->product = compute_scalar_product (session);
+ return GNUNET_SYSERR; // terminate the tunnel right away, we are done here!
invalid_msg:
- if (s)
- gcry_mpi_release (s);
- if (s_prime)
- gcry_mpi_release (s_prime);
- for (i = 0; r && i < count; i++)
- if (r[i]) gcry_mpi_release (r[i]);
- for (i = 0; r_prime && i < count; i++)
- if (r_prime[i]) gcry_mpi_release (r_prime[i]);
- GNUNET_free_non_null (r);
- GNUNET_free_non_null (r_prime);
+ if (session->s)
+ gcry_mpi_release (session->s);
+ if (session->s_prime)
+ gcry_mpi_release (session->s_prime);
+ for (i = 0; session->r && i < contained_element_count; i++)
+ if (session->r[i]) gcry_mpi_release (session->r[i]);
+ for (i = 0; session->r_prime && i < contained_element_count; i++)
+ if (session->r_prime[i]) gcry_mpi_release (session->r_prime[i]);
+ GNUNET_free_non_null (session->r);
+ GNUNET_free_non_null (session->r_prime);
session->tunnel = NULL;
// send message with product to client
return GNUNET_SYSERR;
}
-
/**
* Task run during shutdown.
*
do_shutdown = GNUNET_YES;
// terminate all owned open tunnels.
- for (session = from_client_head; NULL != session; session = session->next)
- {
- if ((FINALIZED != session->state) && (NULL != session->tunnel)){
+ for (session = from_client_head; NULL != session; session = session->next) {
+ if ((FINALIZED != session->state) && (NULL != session->tunnel)) {
GNUNET_MESH_tunnel_destroy (session->tunnel);
session->tunnel = NULL;
}
- if (GNUNET_SCHEDULER_NO_TASK != session->client_notification_task)
- {
+ if (GNUNET_SCHEDULER_NO_TASK != session->client_notification_task) {
GNUNET_SCHEDULER_cancel (session->client_notification_task);
session->client_notification_task = GNUNET_SCHEDULER_NO_TASK;
}
- if (GNUNET_SCHEDULER_NO_TASK != session->service_request_task)
- {
+ if (GNUNET_SCHEDULER_NO_TASK != session->service_request_task) {
GNUNET_SCHEDULER_cancel (session->service_request_task);
session->service_request_task = GNUNET_SCHEDULER_NO_TASK;
}
- if (NULL != session->client)
- {
+ if (NULL != session->client) {
GNUNET_SERVER_client_disconnect (session->client);
session->client = NULL;
}
}
for (session = from_service_head; NULL != session; session = session->next)
- if (NULL != session->tunnel){
+ if (NULL != session->tunnel) {
GNUNET_MESH_tunnel_destroy (session->tunnel);
- session->tunnel = NULL;
+ session->tunnel = NULL;
}
- if (my_mesh)
- {
+ if (my_mesh) {
GNUNET_MESH_disconnect (my_mesh);
my_mesh = NULL;
}
}
-
/**
* Initialization of the program and message handlers
*
};
static const struct GNUNET_MESH_MessageHandler mesh_handlers[] = {
{ &handle_service_request, GNUNET_MESSAGE_TYPE_SCALARPRODUCT_ALICE_TO_BOB, 0},
+ { &handle_service_request_multipart, GNUNET_MESSAGE_TYPE_SCALARPRODUCT_ALICE_TO_BOB_MULTIPART, 0},
{ &handle_service_response, GNUNET_MESSAGE_TYPE_SCALARPRODUCT_BOB_TO_ALICE, 0},
+ { &handle_service_response_multipart, GNUNET_MESSAGE_TYPE_SCALARPRODUCT_BOB_TO_ALICE_MULTIPART, 0},
{NULL, 0, 0}
};
static const uint32_t ports[] = {
&handle_client_disconnect,
NULL);
GNUNET_break (GNUNET_OK ==
- GNUNET_CRYPTO_get_host_identity (c,
+ GNUNET_CRYPTO_get_peer_identity (c,
&me));
my_mesh = GNUNET_MESH_connect (c, NULL,
&tunnel_incoming_handler,
&tunnel_destruction_handler,
mesh_handlers, ports);
- if (!my_mesh)
- {
+ if (!my_mesh) {
GNUNET_log (GNUNET_ERROR_TYPE_ERROR, _ ("Connect to MESH failed\n"));
GNUNET_SCHEDULER_shutdown ();
return;
NULL);
}
-
/**
* The main function for the scalarproduct service.
*
projects / oweals / gnunet.git / blobdiff