[GNUnet-SVN] r31818 - gnunet/src/secretsharing

[gnunet]

Author: dold
Date: 2014-01-07 10:40:05 +0100 (Tue, 07 Jan 2014)
New Revision: 31818

Added:
   gnunet/src/secretsharing/secretsharing_common.c
Modified:
   gnunet/src/secretsharing/gnunet-service-secretsharing.c
Log:
missing secretsharing_common.c

Modified: gnunet/src/secretsharing/gnunet-service-secretsharing.c
===================================================================
--- gnunet/src/secretsharing/gnunet-service-secretsharing.c     2014-01-07 
09:38:22 UTC (rev 31817)
+++ gnunet/src/secretsharing/gnunet-service-secretsharing.c     2014-01-07 
09:40:05 UTC (rev 31818)
@@ -1020,6 +1020,10 @@
   element->data = d;
   element->size = sizeof *d;
 
+  GNUNET_log (GNUNET_ERROR_TYPE_INFO, "alloc'd size %u\n", sizeof *element + 
sizeof *d);
+  GNUNET_log (GNUNET_ERROR_TYPE_INFO, "element size %u\n", element->size);
+
+
   d->peer = my_peer;
 
   GNUNET_assert (0 != (v = gcry_mpi_new (PAILLIER_BITS)));
@@ -1032,6 +1036,8 @@
 
   GNUNET_CRYPTO_hash (v_data, PAILLIER_BITS / 8, &d->commitment);
 
+  /*
+
   GNUNET_assert (0 == gcry_mpi_print (GCRYMPI_FMT_USG,
                                       (unsigned char *) d->pubkey.g, 
PAILLIER_BITS / 8, NULL,
                                       
ks->info[ks->local_peer_idx].paillier_g));
@@ -1040,6 +1046,8 @@
                                       (unsigned char *) d->pubkey.n, 
PAILLIER_BITS / 8, NULL,
                                       
ks->info[ks->local_peer_idx].paillier_n));
 
+  */
+
   d->purpose.size = htonl ((sizeof *d) - offsetof (struct 
GNUNET_SECRETSHARING_KeygenCommitData, purpose));
   d->purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_SECRETSHARING_DKG1);
   GNUNET_assert (GNUNET_OK == GNUNET_CRYPTO_eddsa_sign (my_peer_private_key, 
&d->purpose, &d->signature));

Added: gnunet/src/secretsharing/secretsharing_common.c
===================================================================
--- gnunet/src/secretsharing/secretsharing_common.c                             
(rev 0)
+++ gnunet/src/secretsharing/secretsharing_common.c     2014-01-07 09:40:05 UTC 
(rev 31818)
@@ -0,0 +1,136 @@
+/*
+     This file is part of GNUnet.
+     (C) 2014 Christian Grothoff (and other contributing authors)
+
+     GNUnet is free software; you can redistribute it and/or modify
+     it under the terms of the GNU General Public License as published
+     by the Free Software Foundation; either version 3, or (at your
+     option) any later version.
+
+     GNUnet is distributed in the hope that it will be useful, but
+     WITHOUT ANY WARRANTY; without even the implied warranty of
+     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+     General Public License for more details.
+
+     You should have received a copy of the GNU General Public License
+     along with GNUnet; see the file COPYING.  If not, write to the
+     Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+     Boston, MA 02111-1307, USA.
+*/
+
+#include "secretsharing.h"
+
+/**
+ * Read a share from its binary representation.
+ *
+ * @param data Binary representation of the share.
+ * @param len Length of @a data.
+ * @param[out] readlen Number of bytes read,
+ *             ignored if NULL.
+ * @return The share, or NULL on error.
+ */
+struct GNUNET_SECRETSHARING_Share *
+GNUNET_SECRETSHARING_share_read (const void *data, size_t len, size_t *readlen)
+{
+  struct GNUNET_SECRETSHARING_Share *share;
+  const struct GNUNET_SECRETSHARING_ShareHeaderNBO *sh = data;
+  char *p;
+  size_t n;
+  uint16_t payload_size;
+
+  payload_size = ntohs (sh->num_peers) * 
+      (sizeof (uint16_t) + sizeof (struct GNUNET_SECRETSHARING_FieldElement) + 
+       sizeof (struct GNUNET_PeerIdentity));
+
+  if (NULL != readlen)
+    *readlen = payload_size + sizeof *sh;
+
+  share = GNUNET_malloc (sizeof *share);
+
+  share->threshold = ntohs (sh->threshold);
+  share->num_peers = ntohs (sh->num_peers);
+  share->my_peer = ntohs (sh->my_peer);
+
+  share->my_share = sh->my_share;
+  share->public_key = sh->public_key;
+
+  p = (void *) &sh[1];
+
+  n = share->num_peers * sizeof (struct GNUNET_PeerIdentity);
+  share->peers = GNUNET_malloc (n);
+  memcpy (share->peers, p, n);
+  p += n;
+
+  n = share->num_peers * sizeof (struct GNUNET_SECRETSHARING_FieldElement);
+  share->hom_share_commitments = GNUNET_malloc (n);
+  memcpy (share->hom_share_commitments, p, n);
+  p += n;
+
+  n = share->num_peers * sizeof (uint16_t);
+  share->original_indices = GNUNET_malloc (n);
+  memcpy (share->original_indices, p, n);
+
+  return share;
+}
+
+
+/**
+ * Convert a share to its binary representation.
+ * Can be called with a NULL @a buf to get the size of the share.
+ *
+ * @param share Share to write.
+ * @param buf Buffer to write to.
+ * @param buflen Number of writable bytes in @a buf.
+ * @param[out] writelen Pointer to store number of bytes written,
+ *             ignored if NULL.
+ * @return #GNUNET_OK on success, #GNUNET_SYSERR on failure.
+ */
+int
+GNUNET_SECRETSHARING_share_write (const struct GNUNET_SECRETSHARING_Share 
*share,
+                                  void *buf, size_t buflen, size_t *writelen)
+{
+  uint16_t payload_size;
+  struct GNUNET_SECRETSHARING_ShareHeaderNBO *sh;
+  char *p;
+  int n;
+
+  payload_size = ntohs (sh->num_peers) * 
+      (sizeof (uint16_t) + sizeof (struct GNUNET_SECRETSHARING_FieldElement) + 
+       sizeof (struct GNUNET_PeerIdentity));
+
+  if (NULL != writelen)
+    *writelen = payload_size + sizeof (struct 
GNUNET_SECRETSHARING_ShareHeaderNBO);
+
+  /* just a query for the writelen */
+  if (buf == NULL)
+    return GNUNET_OK;
+
+  /* wrong buffer size */
+  if (buflen < payload_size + sizeof (struct 
GNUNET_SECRETSHARING_ShareHeaderNBO))
+    return GNUNET_SYSERR;
+
+  sh = buf;
+
+  sh->threshold = htons (share->threshold);
+  sh->num_peers = htons (share->num_peers);
+  sh->my_peer = htons (share->my_peer);
+
+  sh->my_share = share->my_share;
+  sh->public_key = share->public_key;
+
+  p = (void *) &sh[1];
+
+  n = share->num_peers * sizeof (struct GNUNET_PeerIdentity);
+  memcpy (p, share->peers, n);
+  p += n;
+
+  n = share->num_peers * sizeof (struct GNUNET_SECRETSHARING_FieldElement);
+  memcpy (p, share->hom_share_commitments, n);
+  p += n;
+
+  n = share->num_peers * sizeof (uint16_t);
+  memcpy (p, share->original_indices, n);
+
+  return GNUNET_OK;
+}
+