// Service Structure Definitions
///////////////////////////////////////////////////////////////////////////////
+
/**
* state a session can be in
*/
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
};
+
/**
* role a peer in a session can assume
*/
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 GNUNET_HashCode key;
- /**
+ /**
* state of the session
*/
enum SessionState state;
/**
* how many elements we were supplied with from the client
*/
- uint32_t element_count;
+ uint32_t total;
/**
* how many elements actually are used after applying the mask
*/
- uint32_t used_element_count;
+ uint32_t used;
+
+ /**
+ * already transferred elements (sent/received) for multipart messages, less or equal than used_element_count for
+ */
+ uint32_t transferred;
+
+ /**
+ * index of the last transferred element for multipart messages
+ */
+ uint32_t last_processed;
/**
- * how many bytes the mask is long.
+ * 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;
gcry_mpi_t * a;
/**
- * The computed scalar
+ * 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;
struct GNUNET_SERVER_TransmitHandle * client_transmit_handle;
/**
- * tunnel-handle associated with our mesh handle
+ * channel-handle associated with our mesh handle
*/
- struct GNUNET_MESH_Tunnel * tunnel;
+ struct GNUNET_MESH_Channel * channel;
+ /**
+ * Handle to a task that sends a msg to the our client
+ */
GNUNET_SCHEDULER_TaskIdentifier client_notification_task;
+ /**
+ * Handle to a task that sends a msg to the our peer
+ */
GNUNET_SCHEDULER_TaskIdentifier service_request_task;
};
+///////////////////////////////////////////////////////////////////////////////
+// Forward Delcarations
+///////////////////////////////////////////////////////////////////////////////
+
+/**
+ * Send a multi part chunk of a service request from alice to bob.
+ * This element only contains a part of the elements-vector (session->a[]),
+ * mask and public key set have to be contained within the first message
+ *
+ * This allows a ~32kbit key length while using 32000 elements or 62000 elements per request.
+ *
+ * @param cls the associated service session
+ */
+static void
+prepare_service_request_multipart (void *cls);
+
+/**
+ * Send a multi part chunk of a service response from bob to alice.
+ * This element only contains the two permutations of R, R'.
+ *
+ * @param cls the associated service session
+ */
+static void
+prepare_service_response_multipart (void *cls);
+
+
///////////////////////////////////////////////////////////////////////////////
// Global Variables
///////////////////////////////////////////////////////////////////////////////
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
*/
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);
my_lambda = gcry_mpi_new (0);
// calculate lambda
- // lambda = \frac{(p-1)*(q-1)}{gcd(p-1,q-1)}
+ // lambda = frac{(p-1)*(q-1)}{gcd(p-1,q-1)}
gcry_mpi_sub_ui (tmp1, p, 1);
gcry_mpi_sub_ui (tmp2, q, 1);
gcry_mpi_gcd (gcd, tmp1, tmp2);
// 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);
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
- * @param n the module from which which r is chosen (Z*_n)
- * @param n_square the module for encryption, for performance reasons.
- */
-static void
-encrypt_element (gcry_mpi_t c, gcry_mpi_t m, gcry_mpi_t g, gcry_mpi_t n, gcry_mpi_t n_square)
-{
- gcry_mpi_t tmp;
-
- GNUNET_assert (tmp = gcry_mpi_new (0));
-
- 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_powm (c, g, m, n_square);
- gcry_mpi_powm (tmp, tmp, n, n_square);
- gcry_mpi_mulm (c, tmp, c, n_square);
-
- 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
/**
* 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);
}
* 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
do_send_message (void *cls, size_t size, void *buf)
{
struct ServiceSession * session = cls;
- size_t written = 0;
+ uint16_t type;
GNUNET_assert (buf);
- if (ntohs (session->msg->size) == size)
- {
- memcpy (buf, session->msg, size);
- written = size;
+ if (ntohs (session->msg->size) != size) {
+ GNUNET_break (0);
+ return 0;
}
- switch (ntohs (session->msg->type))
+ type = ntohs (session->msg->type);
+ memcpy (buf, session->msg, size);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Sent a message of type %hu.\n",
+ type);
+ GNUNET_free (session->msg);
+ session->msg = NULL;
+
+ switch (type)
{
case GNUNET_MESSAGE_TYPE_SCALARPRODUCT_SERVICE_TO_CLIENT:
session->state = FINALIZED;
session->client_transmit_handle = NULL;
break;
- default:
+
+ case GNUNET_MESSAGE_TYPE_SCALARPRODUCT_ALICE_TO_BOB:
+ case GNUNET_MESSAGE_TYPE_SCALARPRODUCT_ALICE_TO_BOB_MULTIPART:
session->service_transmit_handle = NULL;
- }
+ if (session->state == WAITING_FOR_MULTIPART_TRANSMISSION)
+ prepare_service_request_multipart (session);
+ break;
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Sent a message of type %hu.\n",
- ntohs (session->msg->type));
- GNUNET_free (session->msg);
- session->msg = NULL;
+ case GNUNET_MESSAGE_TYPE_SCALARPRODUCT_BOB_TO_ALICE:
+ case GNUNET_MESSAGE_TYPE_SCALARPRODUCT_BOB_TO_ALICE_MULTIPART:
+ session->service_transmit_handle = NULL;
+ if (session->state == WAITING_FOR_MULTIPART_TRANSMISSION)
+ prepare_service_response_multipart (session);
+ break;
+
+ default:
+ GNUNET_assert (0);
+ }
- return written;
+ return size;
}
/**
* 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
*/
/**
* 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]];
/**
- * 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
- */
-static gcry_mpi_t *
-generate_random_vector (uint32_t length)
-{
- gcry_mpi_t * random_vector;
- int32_t value;
- uint32_t i;
-
- random_vector = initialize_mpi_vector (length);
- for (i = 0; i < length; i++)
- {
- value = (int32_t) GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, UINT32_MAX);
-
- // long to gcry_mpi_t
- if (value < 0)
- gcry_mpi_sub_ui (random_vector[i],
- random_vector[i],
- -value);
- else
- random_vector[i] = gcry_mpi_set_ui (random_vector[i], value);
- }
-
- 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,
- * else NULL
+ * @param key - the key we want to search for
+ * @param element_count - the total element count of the dataset (session->total)
+ * @param state - a pointer to the state the session should be in, NULL to ignore
+ * @param peerid - a pointer to the peer ID of the associated peer, NULL to ignore
+ * @return a pointer to a matching session, or NULL
*/
static struct ServiceSession *
find_matching_session (struct ServiceSession * tail,
{
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->total == 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;
}
-
+/**
+ * Safely frees ALL memory areas referenced by a session.
+ *
+ * @param session - the session to free elements from
+ */
static void
-free_session (struct ServiceSession * session)
+free_session_variables (struct ServiceSession * session)
{
unsigned int i;
- if (session->a)
- {
- for (i = 0; i < session->used_element_count; i++)
- gcry_mpi_release (session->a[i]);
-
+ if (session->a) {
+ for (i = 0; i < session->used; i++)
+ if (session->a[i]) gcry_mpi_release (session->a[i]);
GNUNET_free (session->a);
+ session->a = NULL;
+ }
+ if (session->mask) {
+ GNUNET_free (session->mask);
+ session->mask = NULL;
}
- if (session->product)
+ if (session->r) {
+ for (i = 0; i < session->used; i++)
+ if (session->r[i]) gcry_mpi_release (session->r[i]);
+ GNUNET_free (session->r);
+ session->r = NULL;
+ }
+ if (session->r_prime) {
+ for (i = 0; i < session->used; i++)
+ if (session->r_prime[i]) gcry_mpi_release (session->r_prime[i]);
+ GNUNET_free (session->r_prime);
+ session->r_prime = NULL;
+ }
+ if (session->s) {
+ gcry_mpi_release (session->s);
+ session->s = NULL;
+ }
+
+ if (session->s_prime) {
+ gcry_mpi_release (session->s_prime);
+ session->s_prime = NULL;
+ }
+
+ if (session->product) {
gcry_mpi_release (session->product);
+ session->product = NULL;
+ }
- if (session->remote_pubkey)
+ if (session->remote_pubkey) {
gcry_sexp_release (session->remote_pubkey);
+ session->remote_pubkey = NULL;
+ }
- GNUNET_free_non_null (session->vector);
- GNUNET_free (session);
+ if (session->vector) {
+ GNUNET_free_non_null (session->vector);
+ session->s = NULL;
+ }
}
///////////////////////////////////////////////////////////////////////////////
// Event and Message Handlers
/**
- * A client disconnected.
- *
- * Remove the associated session(s), release datastructures
+ * A client disconnected.
+ *
+ * Remove the associated session(s), release data structures
* and cancel pending outgoing transmissions to the client.
* if the session has not yet completed, we also cancel Alice's request to Bob.
*
{
struct ServiceSession *session;
- if (client == NULL)
+ if (NULL != client)
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ _ ("Client (%p) disconnected from us.\n"), client);
+ else
return;
+
session = GNUNET_SERVER_client_get_user_context (client, struct ServiceSession);
if (NULL == session)
return;
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- _ ("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)
+ if (session->service_transmit_handle && session->channel)
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 (session->channel && session->state == WAITING_FOR_SERVICE_RESPONSE)
+ GNUNET_MESH_channel_destroy (session->channel);
}
- 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);
+ free_session_variables (session);
+ GNUNET_free (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.
+ *
+ * @param cls the associated client session
+ * @param tc the task context handed to us by the scheduler, unused
*/
static void
prepare_client_end_notification (void * cls,
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;
else
GNUNET_log (GNUNET_ERROR_TYPE_INFO, _ ("Sending session-end notification to client (%p) for session %s\n"), &session->client, GNUNET_h2s (&session->key));
+ free_session_variables (session);
}
/**
- * Bob executes:
- * 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
- * GNUNET_OK if the operation succeeded
+ * prepare the response we will send to alice or bobs' clients.
+ * in Bobs case the product will be NULL.
+ *
+ * @param cls the session associated with our client.
+ * @param tc the task context handed to us by the scheduler, unused
*/
-static int
-prepare_service_response (gcry_mpi_t * r,
- gcry_mpi_t * r_prime,
- gcry_mpi_t s,
- gcry_mpi_t s_prime,
- struct ServiceSession * request,
- struct ServiceSession * response)
+static void
+prepare_client_response (void *cls,
+ const struct GNUNET_SCHEDULER_TaskContext *tc)
{
- struct GNUNET_SCALARPRODUCT_service_response * msg;
+ struct ServiceSession * session = cls;
+ struct GNUNET_SCALARPRODUCT_client_response * msg;
+ unsigned char * product_exported = NULL;
+ size_t product_length = 0;
uint32_t msg_length = 0;
- unsigned char * current = NULL;
- unsigned char * element_exported = NULL;
- size_t element_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
+ int8_t range = -1;
+ gcry_error_t rc;
+ int sign;
- msg = GNUNET_malloc (msg_length);
+ session->client_notification_task = GNUNET_SCHEDULER_NO_TASK;
- 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));
- current = (unsigned char *) &msg[1];
+ if (session->product) {
+ gcry_mpi_t value = gcry_mpi_new (0);
- // 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
- // 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;
- }
+ 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) {
+ gcry_mpi_sub (value, value, session->product);
+ }
+ else if (0 < sign) {
+ range = 1;
+ gcry_mpi_add (value, value, session->product);
+ }
+ else
+ range = 0;
- // 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;
- }
+ gcry_mpi_release (session->product);
+ session->product = NULL;
- // convert kp[]
- for (i = 0; i < request->used_element_count; i++)
- {
- element_exported = GNUNET_malloc (PAILLIER_ELEMENT_LENGTH);
- GNUNET_assert (0 == gcry_mpi_print (GCRYMPI_FMT_USG,
- element_exported, PAILLIER_ELEMENT_LENGTH,
- &element_length,
- 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;
+ // get representation as string
+ if (range
+ && (0 != (rc = gcry_mpi_aprint (GCRYMPI_FMT_STD,
+ &product_exported,
+ &product_length,
+ 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
+ }
+ gcry_mpi_release (value);
}
-
- // convert kq[]
- for (i = 0; i < request->used_element_count; i++)
+ msg_length = sizeof (struct GNUNET_SCALARPRODUCT_client_response) +product_length;
+ msg = GNUNET_malloc (msg_length);
+ msg->key = session->key;
+ msg->peer = session->peer;
+ if (product_exported != NULL)
{
- element_exported = GNUNET_malloc (PAILLIER_ELEMENT_LENGTH);
- GNUNET_assert (0 == gcry_mpi_print (GCRYMPI_FMT_USG,
- element_exported, PAILLIER_ELEMENT_LENGTH,
- &element_length,
- 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;
+ memcpy (&msg[1], product_exported, product_length);
+ GNUNET_free (product_exported);
}
+ msg->header.type = htons (GNUNET_MESSAGE_TYPE_SCALARPRODUCT_SERVICE_TO_CLIENT);
+ msg->header.size = htons (msg_length);
+ msg->range = range;
+ msg->product_length = htonl (product_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,
+ session->msg = (struct GNUNET_MessageHeader *) msg;
+ //transmit this message to our client
+ session->client_transmit_handle =
+ GNUNET_SERVER_notify_transmit_ready (session->client,
msg_length,
+ GNUNET_TIME_UNIT_FOREVER_REL,
&do_send_message,
- request);
- request->state = FINALIZED;
- }
- else
- GNUNET_log (GNUNET_ERROR_TYPE_WARNING, _ ("Message too large, fragmentation is currently not supported!)\n"));
+ session);
+ if (NULL == session->client_transmit_handle) {
+ GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
+ _ ("Could not send message to client (%p)!\n"),
+ session->client);
+ session->client = NULL;
+ // callback was not called!
+ GNUNET_free (msg);
+ session->msg = NULL;
+ }
+ else
+ // gracefully sent message, just terminate session structure
+ GNUNET_log (GNUNET_ERROR_TYPE_INFO,
+ _ ("Sent result to client (%p), this session (%s) has ended!\n"),
+ session->client,
+ GNUNET_h2s (&session->key));
+ free_session_variables (session);
+}
+
+
+/**
+ * Send a multipart chunk of a service response from bob to alice.
+ * This element only contains the two permutations of R, R'.
+ *
+ * @param cls the associated service session
+ */
+static void
+prepare_service_response_multipart (void *cls)
+{
+ 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 - session->transferred;
+
+ 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; i < session->transferred + 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; i < session->transferred; i++) {
+ gcry_mpi_release (session->r_prime[i]);
+ session->r_prime[i] = NULL;
+ gcry_mpi_release (session->r[i]);
+ session->r[i] = NULL;
+ }
+ session->transferred += todo_count;
+ session->msg = (struct GNUNET_MessageHeader *) msg;
+ session->service_transmit_handle =
+ GNUNET_MESH_notify_transmit_ready (session->channel,
+ 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;
+ }
+ if (session->transferred != session->used)
+ // more multiparts
+ session->state = WAITING_FOR_MULTIPART_TRANSMISSION;
+ else{
+ // final part
+ session->state = FINALIZED;
+ GNUNET_free(session->r);
+ GNUNET_free(session->r_prime);
+ session->r_prime = NULL;
+ session->r = NULL;
+ }
+}
+
+
+/**
+ * Bob executes:
+ * 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 s S: $S := E_A(sum (r_i + b_i)^2)$
+ * @param s_prime S': $S' := E_A(sum r_i^2)$
+ * @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 s,
+ gcry_mpi_t s_prime,
+ struct ServiceSession * session)
+{
+ struct GNUNET_SCALARPRODUCT_service_response * msg;
+ uint32_t msg_length = 0;
+ unsigned char * current = NULL;
+ unsigned char * element_exported = NULL;
+ size_t element_length = 0;
+ int i;
+
+ msg_length = sizeof (struct GNUNET_SCALARPRODUCT_service_response)
+ + 2 * PAILLIER_ELEMENT_LENGTH; // s, stick
+
+ if (GNUNET_SERVER_MAX_MESSAGE_SIZE > msg_length + 2 * session->used * PAILLIER_ELEMENT_LENGTH) { //kp, kq
+ msg_length += +2 * session->used * PAILLIER_ELEMENT_LENGTH;
+ session->transferred = session->used;
+ }
+ else {
+ session->transferred = (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->total_element_count = htonl (session->total);
+ msg->used_element_count = htonl (session->used);
+ msg->contained_element_count = htonl (session->transferred);
+ 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
+ // convert s
+ 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
+ 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 k[][]
+ for (i = 0; i < session->transferred; 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 = 0; i < session->transferred; i++) {
+ gcry_mpi_release (session->r_prime[i]);
+ session->r_prime[i] = NULL;
+ gcry_mpi_release (session->r[i]);
+ session->r[i] = NULL;
+ }
+ gcry_mpi_release (s);
+ session->s = NULL;
+ gcry_mpi_release (s_prime);
+ session->s_prime = NULL;
+
+ session->msg = (struct GNUNET_MessageHeader *) msg;
+ session->service_transmit_handle =
+ GNUNET_MESH_notify_transmit_ready (session->channel,
+ 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 GNUNET_NO;
}
+ if (session->transferred != session->used)
+ // multipart
+ session->state = WAITING_FOR_MULTIPART_TRANSMISSION;
+ else{
+ //singlepart
+ session->state = FINALIZED;
+ GNUNET_free(session->r);
+ GNUNET_free(session->r_prime);
+ session->r_prime = NULL;
+ session->r = NULL;
+ }
+
return GNUNET_OK;
}
/**
- * 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': $S' := E_A(\sum r_i^2)$
- *
+ * 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
uint32_t count;
gcry_mpi_t * rand = NULL;
gcry_mpi_t * r = NULL;
+ struct GNUNET_CRYPTO_PaillierCiphertext * R;
gcry_mpi_t * r_prime = NULL;
+ struct GNUNET_CRYPTO_PaillierCiphertext * R_prime;
gcry_mpi_t * b;
gcry_mpi_t * a_pi;
gcry_mpi_t * a_pi_prime;
gcry_mpi_t * rand_pi;
gcry_mpi_t * rand_pi_prime;
gcry_mpi_t s = NULL;
+ struct GNUNET_CRYPTO_PaillierCiphertext * S;
gcry_mpi_t s_prime = NULL;
- gcry_mpi_t remote_n = NULL;
- gcry_mpi_t remote_nsquare;
- gcry_mpi_t remote_g = NULL;
- gcry_sexp_t tmp_exp;
+ struct GNUNET_CRYPTO_PaillierCiphertext * S_prime;
+
uint32_t value;
- count = request->used_element_count;
+ count = request->used;
b = GNUNET_malloc (sizeof (gcry_mpi_t) * count);
a_pi = GNUNET_malloc (sizeof (gcry_mpi_t) * count);
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++)
+ for (i = 0, j = 0; i < response->total && j < count; i++)
{
if (request->mask[i / 8] & (1 << (i % 8)))
{
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++;
}
GNUNET_free (response->vector);
response->vector = NULL;
+ q = NULL;
+ p = NULL;
- tmp_exp = gcry_sexp_find_token (request->remote_pubkey, "n", 0);
- 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)
- {
- GNUNET_break (0);
- gcry_sexp_release (tmp_exp);
- goto except;
- }
- remote_nsquare = gcry_mpi_new (KEYBITS + 1);
- gcry_mpi_mul (remote_nsquare, remote_n, remote_n);
- gcry_sexp_release (tmp_exp);
- tmp_exp = gcry_sexp_find_token (request->remote_pubkey, "g", 0);
- gcry_sexp_release (request->remote_pubkey);
- request->remote_pubkey = NULL;
- 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)
+ // generate r, p and q
+ rand = initialize_mpi_vector (count);
+ for (i = 0; i < count; i++)
{
- GNUNET_break (0);
- gcry_mpi_release (remote_n);
- gcry_sexp_release (tmp_exp);
- goto except;
- }
- gcry_sexp_release (tmp_exp);
+ int32_t svalue;
- // generate r, p and q
- rand = generate_random_vector (count);
+ svalue = (int32_t) GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, UINT32_MAX);
+
+ // long to gcry_mpi_t
+ if (svalue < 0)
+ gcry_mpi_sub_ui (rand[i],
+ rand[i],
+ -svalue);
+ else
+ rand[i] = gcry_mpi_set_ui (rand[i], svalue);
+ }
p = GNUNET_CRYPTO_random_permute (GNUNET_CRYPTO_QUALITY_WEAK, count);
q = GNUNET_CRYPTO_random_permute (GNUNET_CRYPTO_QUALITY_WEAK, count);
//initialize the result vectors
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);
memcpy (b_pi, b, sizeof (gcry_mpi_t) * count);
memcpy (rand_pi, rand, sizeof (gcry_mpi_t) * count);
memcpy (rand_pi_prime, rand, sizeof (gcry_mpi_t) * count);
+
+ //todo get API-cryptoblocks, instead of MPI values
// generate p and q permutations for a, b and r
+ // TODO: APIify
GNUNET_assert (permute_vector (a_pi, p, count));
GNUNET_assert (permute_vector (b_pi, p, count));
GNUNET_assert (permute_vector (rand_pi, p, 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++)
// 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]);
- encrypt_element (r[i], r[i], remote_g, remote_n, remote_nsquare);
-
+ GNUNET_CRYPTO_paillier_encrypt (&request->remote_pubkey,
+ r[i],
+ &R[i]);
+
// E(S - r_pi - b_pi) * E(S + a_pi) == E(2*S + a - r - b)
- gcry_mpi_mulm (r[i], r[i], a_pi[i], remote_nsquare);
+ GNUNET_CRYPTO_paillier_hom_add (&request->remote_pubkey,
+ &R[i],
+ &A_pi[i],
+ &R[i]);
}
GNUNET_free (a_pi);
GNUNET_free (b_pi);
{
// 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_CRYPTO_paillier_encrypt (&request->remote_pubkey,
+ r_prime[i],
+ &R_prime[i]);
// E(S - r_qi) * E(S + a_qi) == E(2*S + a_qi - r_qi)
- gcry_mpi_mulm (r_prime[i], r_prime[i], a_pi_prime[i], remote_nsquare);
+ GNUNET_CRYPTO_paillier_hom_add (&request->remote_pubkey,
+ &R_prime[i],
+ &A_pi_prime[i],
+ &R_prime[i]);
}
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);
+ GNUNET_CRYPTO_paillier_encrypt (&request->remote_pubkey,
+ s_prime,
+ &S_prime);
// 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);
- encrypt_element (s, s, remote_g, remote_n, remote_nsquare);
- gcry_mpi_release (remote_n);
- gcry_mpi_release (remote_g);
- gcry_mpi_release (remote_nsquare);
+ GNUNET_CRYPTO_paillier_encrypt (&request->remote_pubkey,
+ s[i],
+ &S);
// release r and tmp
for (i = 0; i < count; i++)
// 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++)
{
GNUNET_free (b);
GNUNET_free (request->a);
request->a = NULL;
-
+ GNUNET_free_non_null (p);
+ GNUNET_free_non_null (q);
+ GNUNET_free (rand);
return ret;
}
+/**
+ * Send a multi part chunk of a service request from alice to bob.
+ * This element only contains a part of the elements-vector (session->a[]),
+ * mask and public key set have to be contained within the first message
+ *
+ * This allows a ~32kbit key length while using 32000 elements or 62000 elements per request.
+ *
+ * @param cls the associated service session
+ */
+static void
+prepare_service_request_multipart (void *cls)
+{
+ 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 - session->transferred;
+
+ 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, j = 0; i < session->total; 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 + 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 += 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->channel, 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 channel!\n"));
+ GNUNET_free (msg);
+ session->msg = NULL;
+ session->client_notification_task =
+ GNUNET_SCHEDULER_add_now (&prepare_client_end_notification,
+ session);
+ return;
+ }
+ if (session->transferred != session->used) {
+ session->last_processed = 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
- * #GNUNET_OK if we sent it
+ *
+ * @param cls the session associated with this request
+ * @param tc task context handed over by scheduler, unsued
*/
static void
prepare_service_request (void *cls,
{
struct ServiceSession * session = cls;
unsigned char * current;
+ unsigned char * element_exported;
struct GNUNET_SCALARPRODUCT_service_request * msg;
unsigned int i;
unsigned int j;
session->service_request_task = GNUNET_SCHEDULER_NO_TASK;
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, _ ("Successfully created new tunnel to peer (%s)!\n"), GNUNET_i2s (&session->peer));
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, _ ("Successfully created new channel 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 * PAILLIER_ELEMENT_LENGTH) {
+ msg_length += session->used * PAILLIER_ELEMENT_LENGTH;
+ session->transferred = session->used;
+ }
+ else {
+ //create a multipart msg, first we calculate a new msg size for the head msg
+ session->transferred = (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);
+ msg->contained_element_count = htonl (session->transferred);
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->element_count = htonl (session->total);
msg->header.size = htons (msg_length);
// fill in the payload
current += my_pubkey_external_length;
// now copy over the element vector
- session->a = GNUNET_malloc (sizeof (gcry_mpi_t) * session->used_element_count);
+ element_exported = GNUNET_malloc (PAILLIER_ELEMENT_LENGTH);
+ session->a = GNUNET_malloc (sizeof (gcry_mpi_t) * session->used);
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->total; 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 <= 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"));
//transmit via mesh messaging
- session->service_transmit_handle = GNUNET_MESH_notify_transmit_ready (session->tunnel, GNUNET_YES,
+ session->service_transmit_handle = GNUNET_MESH_notify_transmit_ready (session->channel, 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 mutlicast message to tunnel!\n"));
+ if (!session->service_transmit_handle) {
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR, _ ("Could not send message to channel!\n"));
GNUNET_free (msg);
session->msg = NULL;
session->client_notification_task =
session);
return;
}
- session->state = WAITING_FOR_SERVICE_RESPONSE;
+ if (session->transferred != session->used) {
+ session->state = WAITING_FOR_MULTIPART_TRANSMISSION;
+ session->last_processed = 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);
+ free_session_variables (session);
+ GNUNET_free (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"));
+ _("Invalid message received from client, session information incorrect!\n"));
GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
return;
}
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"),
+ _("Duplicate session information received, cannot create new session with key `%s'\n"),
GNUNET_h2s (&msg->key));
GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
return;
session->service_request_task = GNUNET_SCHEDULER_NO_TASK;
session->client_notification_task = GNUNET_SCHEDULER_NO_TASK;
session->client = client;
- session->element_count = element_count;
+ session->total = element_count;
session->mask_length = mask_length;
// get our transaction key
memcpy (&session->key, &msg->key, sizeof (struct GNUNET_HashCode));
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"),
+ _("Got client-request-session with key %s, preparing channel to remote service.\n"),
GNUNET_h2s (&session->key));
session->role = ALICE;
memcpy (session->mask, &vector[element_count], mask_length);
// copy over the elements
- session->used_element_count = 0;
+ session->used = 0;
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));
if (session->mask[i / 8] & (1 << (i % 8)))
- session->used_element_count++;
+ session->used++;
}
- if (0 == session->used_element_count)
+ if (0 == session->used)
{
GNUNET_break_op (0);
GNUNET_free (session->vector);
// get our peer ID
memcpy (&session->peer, &msg->peer, sizeof (struct GNUNET_PeerIdentity));
GNUNET_log (GNUNET_ERROR_TYPE_INFO,
- _ ("Creating new tunnel to for session with key %s.\n"),
+ _ ("Creating new channel for session with key %s.\n"),
GNUNET_h2s (&session->key));
- session->tunnel = GNUNET_MESH_tunnel_create (my_mesh, session,
+ session->channel = GNUNET_MESH_channel_create (my_mesh, session,
&session->peer,
GNUNET_APPLICATION_TYPE_SCALARPRODUCT,
- GNUNET_NO,
- GNUNET_YES);
- //prepare_service_request, tunnel_peer_disconnect_handler,
- if (!session->tunnel)
- {
+ GNUNET_MESH_OPTION_RELIABLE);
+ //prepare_service_request, channel_peer_disconnect_handler,
+ if (!session->channel) {
GNUNET_break (0);
GNUNET_free (session->vector);
GNUNET_free (session);
session->role = BOB;
session->mask = NULL;
// copy over the elements
- session->used_element_count = element_count;
+ session->used = element_count;
for (i = 0; i < element_count; i++)
session->vector[i] = ntohl (vector[i]);
session->state = CLIENT_RESPONSE_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,
+ session->total,
&needed_state, NULL);
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));
+ 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 =
GNUNET_SCHEDULER_add_now (&prepare_client_end_notification,
}
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));
+ 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()
}
/**
- * Function called for inbound tunnels.
+ * Function called for inbound channels.
*
* @param cls closure
- * @param tunnel new handle to the tunnel
- * @param initiator peer that started the tunnel
- * @param atsi performance information for the tunnel
- * @return initial tunnel context for the tunnel
- * (can be NULL -- that's not an error)
+ * @param channel new handle to the channel
+ * @param initiator peer that started the channel
+ * @param port unused
+ * @param options unused
+ *
+ * @return session associated with the channel
*/
static void *
-tunnel_incoming_handler (void *cls,
- struct GNUNET_MESH_Tunnel *tunnel,
+channel_incoming_handler (void *cls,
+ struct GNUNET_MESH_Channel *channel,
const struct GNUNET_PeerIdentity *initiator,
- uint32_t port)
+ uint32_t port, enum GNUNET_MESH_ChannelOption options)
{
struct ServiceSession * c = GNUNET_new (struct ServiceSession);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ _("New incoming channel from peer %s.\n"),
+ GNUNET_i2s (initiator));
+
c->peer = *initiator;
- c->tunnel = tunnel;
+ c->channel = channel;
c->role = BOB;
c->state = WAITING_FOR_SERVICE_REQUEST;
return c;
/**
- * Function called whenever a tunnel is destroyed. Should clean up
- * any associated state.
- *
- * It must NOT call GNUNET_MESH_tunnel_destroy on the tunnel.
+ * Function called whenever a channel is destroyed. Should clean up
+ * any associated state.
+ *
+ * It must NOT call GNUNET_MESH_channel_destroy on the channel.
*
* @param cls closure (set from GNUNET_MESH_connect)
- * @param tunnel connection to the other end (henceforth invalid)
- * @param tunnel_ctx place where local state associated
- * with the tunnel is stored
+ * @param channel connection to the other end (henceforth invalid)
+ * @param channel_ctx place where local state associated
+ * with the channel is stored
*/
static void
-tunnel_destruction_handler (void *cls,
- const struct GNUNET_MESH_Tunnel *tunnel,
- void *tunnel_ctx)
+channel_destruction_handler (void *cls,
+ const struct GNUNET_MESH_Channel *channel,
+ void *channel_ctx)
{
- struct ServiceSession * session = tunnel_ctx;
+ struct ServiceSession * session = channel_ctx;
struct ServiceSession * client_session;
struct ServiceSession * curr;
_ ("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))
- {
- session->tunnel = NULL;
+ if ((SERVICE_RESPONSE_RECEIVED > session->state) && (!do_shutdown)) {
+ session->channel = NULL;
// if this happened before we received the answer, we must terminate the session
session->client_notification_task =
GNUNET_SCHEDULER_add_now (&prepare_client_end_notification,
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;
}
// i assume the tupel of key and element count is unique. if it was not the rest of the code would not work either.
client_session = find_matching_session (from_client_tail,
&session->key,
- session->element_count,
+ session->total,
NULL, NULL);
- free_session (session);
+ free_session_variables (session);
+ GNUNET_free (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:
- * $E_A(a_{\pi(i)}) \otimes E_A(- r_{\pi(i)} - b_{\pi(i)}) &= E_A(a_{\pi(i)} - r_{\pi(i)} - b_{\pi(i)})$
- * @param kq - (2) from the protocol definition:
- * $E_A(a_{\pi'(i)}) \otimes E_A(- r_{\pi'(i)}) &= E_A(a_{\pi'(i)} - r_{\pi'(i)})$
- * @param s - S from the protocol definition:
- * $S := E_A(\sum (r_i + b_i)^2)$
- * @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;
gcry_mpi_t u;
- gcry_mpi_t utick;
+ gcry_mpi_t u_prime;
gcry_mpi_t p;
- gcry_mpi_t ptick;
+ gcry_mpi_t p_prime;
gcry_mpi_t tmp;
unsigned int i;
- count = session->used_element_count;
- tmp = gcry_mpi_new (KEYBITS);
+ count = session->used;
// 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);
+ 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);
- gcry_mpi_sub (utick, utick, tmp);
+ u_prime = gcry_mpi_new (0);
+ tmp = compute_square_sum (session->r_prime, count);
+ gcry_mpi_sub (u_prime, u_prime, tmp);
GNUNET_assert (p = gcry_mpi_new (0));
- GNUNET_assert (ptick = gcry_mpi_new (0));
+ GNUNET_assert (p_prime = 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, ptick, utick);
+ gcry_mpi_add (p_prime, session->s_prime, t);
+ gcry_mpi_add (p_prime, p_prime, u_prime);
gcry_mpi_release (t);
gcry_mpi_release (u);
- gcry_mpi_release (utick);
+ gcry_mpi_release (u_prime);
// compute product
- gcry_mpi_sub (p, p, ptick);
- gcry_mpi_release (ptick);
+ gcry_mpi_sub (p, p, p_prime);
+ gcry_mpi_release (p_prime);
tmp = gcry_mpi_set_ui (tmp, 2);
gcry_mpi_div (p, NULL, p, tmp, 0);
/**
- * prepare the response we will send to alice or bobs' clients.
- * in Bobs case the product will be NULL.
- *
- * @param session the session associated with our client.
+ * 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 channel connection to the other end
+ * @param channel_ctx place to store local state associated with the channel
+ * @param message the actual message
+ * @return #GNUNET_OK to keep the connection open,
+ * #GNUNET_SYSERR to close it (signal serious error)
*/
-static void
-prepare_client_response (void *cls,
- const struct GNUNET_SCHEDULER_TaskContext *tc)
+static int
+handle_service_request_multipart (void *cls,
+ struct GNUNET_MESH_Channel * channel,
+ void **channel_ctx,
+ const struct GNUNET_MessageHeader * message)
{
- struct ServiceSession * session = cls;
- struct GNUNET_SCALARPRODUCT_client_response * msg;
- unsigned char * product_exported = NULL;
- size_t product_length = 0;
- uint32_t msg_length = 0;
- int8_t range = -1;
+ 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;
gcry_error_t rc;
- int sign;
-
- session->client_notification_task = GNUNET_SCHEDULER_NO_TASK;
-
- if (session->product)
- {
- gcry_mpi_t value = gcry_mpi_new (0);
+ int32_t i = -1;
- 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)
- {
- gcry_mpi_sub (value, value, session->product);
+ // are we in the correct state?
+ session = (struct ServiceSession *) * channel_ctx;
+ if ((BOB != session->role) || (WAITING_FOR_MULTIPART_TRANSMISSION != session->state)) {
+ goto except;
+ }
+ // shorter than minimum?
+ if (ntohs (msg->header.size) <= sizeof (struct GNUNET_SCALARPRODUCT_multipart_message)) {
+ goto except;
+ }
+ used_elements = session->used;
+ 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)) {
+ goto except;
+ }
+ current = (unsigned char *) &msg[1];
+ if (contained_elements != 0) {
+ // Convert each vector element to MPI_value
+ for (i = session->transferred; i < session->transferred + contained_elements; i++) {
+ size_t read = 0;
+ if (0 != (rc = gcry_mpi_scan (&session->a[i],
+ GCRYMPI_FMT_USG,
+ ¤t[i * PAILLIER_ELEMENT_LENGTH],
+ PAILLIER_ELEMENT_LENGTH,
+ &read))) {
+ LOG_GCRY (GNUNET_ERROR_TYPE_DEBUG, "gcry_mpi_scan", rc);
+ goto except;
+ }
}
- else if (0 < sign)
+ session->transferred += contained_elements;
+
+ if (session->transferred == used_elements)
{
- range = 1;
- gcry_mpi_add (value, value, session->product);
+ // 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...
+ 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
- range = 0;
-
- gcry_mpi_release (session->product);
- session->product = NULL;
-
- // get representation as string
- if (range
- && (0 != (rc = gcry_mpi_aprint (GCRYMPI_FMT_STD,
- &product_exported,
- &product_length,
- 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
+ // multipart message
}
- gcry_mpi_release (value);
}
- msg_length = sizeof (struct GNUNET_SCALARPRODUCT_client_response) +product_length;
- 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)
- {
- memcpy (&msg[1], product_exported, product_length);
- GNUNET_free (product_exported);
- }
- msg->header.type = htons (GNUNET_MESSAGE_TYPE_SCALARPRODUCT_SERVICE_TO_CLIENT);
- msg->header.size = htons (msg_length);
- msg->range = range;
- msg->product_length = htonl (product_length);
-
- session->msg = (struct GNUNET_MessageHeader *) msg;
- //transmit this message to our client
- session->client_transmit_handle =
- GNUNET_SERVER_notify_transmit_ready (session->client,
- msg_length,
- GNUNET_TIME_UNIT_FOREVER_REL,
- &do_send_message,
- session);
- if (NULL == session->client_transmit_handle)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
- _ ("Could not send message to client (%p)!\n"),
- session->client);
- session->client = NULL;
- // callback was not called!
- GNUNET_free (msg);
- session->msg = NULL;
- }
- else
- // gracefully sent message, just terminate session structure
- GNUNET_log (GNUNET_ERROR_TYPE_INFO,
- _ ("Sent result to client (%p), this session (%s) has ended!\n"),
- session->client,
- GNUNET_h2s (&session->key));
+ return GNUNET_OK;
+except:
+ // and notify our client-session that we could not complete the session
+ GNUNET_CONTAINER_DLL_remove (from_service_head, from_service_tail, 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);
+ free_session_variables (session);
+ GNUNET_free (session);
+ return GNUNET_SYSERR;
}
* Handle 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 channel connection to the other end
+ * @param channel_ctx place to store local state associated with the channel
* @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 (void *cls,
- struct GNUNET_MESH_Tunnel * tunnel,
- void **tunnel_ctx,
+ struct GNUNET_MESH_Channel * channel,
+ void **channel_ctx,
const struct GNUNET_MessageHeader * message)
{
struct ServiceSession * session;
uint32_t mask_length;
uint32_t pk_length;
uint32_t used_elements;
+ uint32_t contained_elements = 0;
uint32_t element_count;
uint32_t msg_length;
unsigned char * current;
- struct ServiceSession * responder_session;
+ gcry_error_t rc;
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))
- {
- GNUNET_break_op (0);
- return GNUNET_SYSERR;
+ session = (struct ServiceSession *) * channel_ctx;
+ if (WAITING_FOR_SERVICE_REQUEST != session->state) {
+ goto invalid_msg;
}
// 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)
- || (used_elements == 0) || (mask_length != (element_count / 8 + (element_count % 8 ? 1 : 0)))
- )
+ if ( (ntohs (msg->header.size) != msg_length) ||
+ (element_count < used_elements) ||
+ (used_elements < contained_elements) ||
+ (0 == used_elements) ||
+ (mask_length != (element_count / 8 + ((element_count % 8) ? 1 : 0))) )
{
GNUNET_free (session);
GNUNET_break_op (0);
NULL,
NULL))
{
- GNUNET_log (GNUNET_ERROR_TYPE_ERROR, _ ("Got message with duplicate session key (`%s'), ignoring service request.\n"), (const char *) &(msg->key));
+ 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->used_element_count = used_elements;
- session->tunnel = tunnel;
+ session->total = element_count;
+ session->used = used_elements;
+ session->transferred = contained_elements;
+ session->channel = channel;
// session key
memcpy (&session->key, &msg->key, sizeof (struct GNUNET_HashCode));
current += mask_length;
//convert the publickey to sexp
- 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"));
+ if (0 != (rc = gcry_sexp_new (&session->remote_pubkey, current, pk_length, 1))) {
+ LOG_GCRY (GNUNET_ERROR_TYPE_DEBUG, "gcry_sexp_new", rc);
GNUNET_free (session->mask);
GNUNET_free (session);
return GNUNET_SYSERR;
}
-
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,
+ session->total,
&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)
- {
- gcry_error_t ret = 0;
- session->a = GNUNET_malloc (sizeof (gcry_mpi_t) * used_elements);
+ session->state = WAITING_FOR_MULTIPART_TRANSMISSION;
+ GNUNET_CONTAINER_DLL_insert (from_service_head, from_service_tail, session);
+ if (contained_elements != 0) {
// 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],
- 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;
+ if (0 != (rc = gcry_mpi_scan (&session->a[i],
+ GCRYMPI_FMT_USG,
+ ¤t[i * PAILLIER_ELEMENT_LENGTH],
+ PAILLIER_ELEMENT_LENGTH,
+ &read))) {
+ LOG_GCRY (GNUNET_ERROR_TYPE_DEBUG, "gcry_mpi_scan", rc);
+ goto invalid_msg;
}
}
- 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...
+ goto invalid_msg;
+ }
}
+ 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;
}
-except:
- for (i = 0; i < used_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);
- session->a = NULL;
- free_session (session);
+ return GNUNET_OK;
+invalid_msg:
+ GNUNET_break_op (0);
+ if ((NULL != session->next) || (NULL != session->prev) || (from_service_head == session))
+ GNUNET_CONTAINER_DLL_remove (from_service_head, from_service_tail, 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);
+ free_session_variables (session);
+ 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 channel connection to the other end
+ * @param channel_ctx place to store local state associated with the channel
+ * @param message the actual message
+ * @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_Channel * channel,
+ void **channel_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 = 0;
+ size_t msg_size;
+ size_t required_size;
+ int rc;
+
+ GNUNET_assert (NULL != message);
+ // are we in the correct state?
+ session = (struct ServiceSession *) * channel_ctx;
+ if ((ALICE != session->role) || (WAITING_FOR_MULTIPART_TRANSMISSION != session->state)) {
+ goto invalid_msg;
+ }
+ msg_size = ntohs (msg->header.size);
+ required_size = sizeof (struct GNUNET_SCALARPRODUCT_multipart_message) + 2 * PAILLIER_ELEMENT_LENGTH;
+ // shorter than minimum?
+ if (required_size > msg_size) {
+ goto invalid_msg;
+ }
+ contained = ntohl (msg->multipart_element_count);
+ required_size = sizeof (struct GNUNET_SCALARPRODUCT_multipart_message)
+ + 2 * contained * PAILLIER_ELEMENT_LENGTH;
+ //sanity check: is the message as long as the message_count fields suggests?
+ if ((required_size != msg_size) || (session->used < session->transferred + contained)) {
+ goto invalid_msg;
+ }
+ current = (unsigned char *) &msg[1];
+ // Convert each k[][perm] to its MPI_value
+ for (i = 0; i < contained; 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);
+ goto invalid_msg;
+ }
+ 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);
+ goto invalid_msg;
+ }
+ current += PAILLIER_ELEMENT_LENGTH;
+ }
+ session->transferred += contained;
+ if (session->transferred != session->used)
+ return GNUNET_OK;
+ session->state = SERVICE_RESPONSE_RECEIVED;
+ session->product = compute_scalar_product (session); //never NULL
+
+invalid_msg:
+ GNUNET_break_op (NULL != session->product);
+
+ // send message with product to client
+ if (ALICE == session->role){
+ session->state = FINALIZED;
+ session->channel = NULL;
+ session->client_notification_task =
+ GNUNET_SCHEDULER_add_now (&prepare_client_response,
+ session);
+ }
+ // the channel has done its job, terminate our connection and the channel
+ // the peer will be notified that the channel was destroyed via channel_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.
*
* @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 channel connection to the other end
+ * @param channel_ctx place to store local state associated with the channel
* @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 (we are done)
*/
static int
handle_service_response (void *cls,
- struct GNUNET_MESH_Tunnel * tunnel,
- void **tunnel_ctx,
+ struct GNUNET_MESH_Channel * channel,
+ void **channel_ctx,
const struct GNUNET_MessageHeader * message)
{
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 = 0;
size_t msg_size;
- gcry_mpi_t * r = NULL;
- gcry_mpi_t * r_prime = NULL;
+ size_t required_size;
int rc;
GNUNET_assert (NULL != message);
- session = (struct ServiceSession *) * tunnel_ctx;
- if (ALICE != session->role)
- {
- GNUNET_break_op (0);
- return GNUNET_SYSERR;
+ session = (struct ServiceSession *) * channel_ctx;
+ // are we in the correct state?
+ if (WAITING_FOR_SERVICE_RESPONSE != session->state) {
+ goto invalid_msg;
}
+ //we need at least a full message without elements attached
+ msg_size = ntohs (msg->header.size);
+ required_size = sizeof (struct GNUNET_SCALARPRODUCT_service_response) + 2 * PAILLIER_ELEMENT_LENGTH;
- 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))
- {
- GNUNET_break_op (0);
+ if (required_size > msg_size) {
goto invalid_msg;
}
- used_element_count = ntohl (msg->used_element_count);
- msg_size = sizeof (struct GNUNET_SCALARPRODUCT_service_response)
- + 2 * used_element_count * PAILLIER_ELEMENT_LENGTH
+ contained = ntohl (msg->contained_element_count);
+ required_size = sizeof (struct GNUNET_SCALARPRODUCT_service_response)
+ + 2 * contained * 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))
- {
- GNUNET_break_op (0);
+ if ((msg_size != required_size) || (session->used < contained)) {
goto invalid_msg;
}
-
+ session->state = WAITING_FOR_MULTIPART_TRANSMISSION;
+ session->transferred = contained;
//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);
+ session->r_prime = GNUNET_malloc (sizeof (gcry_mpi_t) * session->used);
+ // Convert each k[][perm] to its MPI_value
+ for (i = 0; i < contained; 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 != session->used)
+ return GNUNET_OK; //wait for the other multipart chunks
+
+ session->state = SERVICE_RESPONSE_RECEIVED;
+ session->product = compute_scalar_product (session); //never NULL
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);
-
- session->tunnel = NULL;
+ GNUNET_break_op (NULL != session->product);
// send message with product to client
- session->client_notification_task =
+ if (ALICE == session->role){
+ session->state = FINALIZED;
+ session->channel = NULL;
+ 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
+ }
+ // the channel has done its job, terminate our connection and the channel
+ // the peer will be notified that the channel was destroyed via channel_destruction_handler
// just close the connection, as recommended by Christian
return GNUNET_SYSERR;
}
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)){
- GNUNET_MESH_tunnel_destroy (session->tunnel);
- session->tunnel = NULL;
+ // terminate all owned open channels.
+ for (session = from_client_head; NULL != session; session = session->next) {
+ if ((FINALIZED != session->state) && (NULL != session->channel)) {
+ GNUNET_MESH_channel_destroy (session->channel);
+ session->channel = 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){
- GNUNET_MESH_tunnel_destroy (session->tunnel);
- session->tunnel = NULL;
+ if (NULL != session->channel) {
+ GNUNET_MESH_channel_destroy (session->channel);
+ session->channel = NULL;
}
- if (my_mesh)
- {
+ if (my_mesh) {
GNUNET_MESH_disconnect (my_mesh);
my_mesh = NULL;
}
};
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,
+ &channel_incoming_handler,
+ &channel_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;
&run, NULL)) ? 0 : 1;
}
-/* end of gnunet-service-ext.c */
+/* end of gnunet-service-scalarproduct.c */
projects / oweals / gnunet.git / blobdiff