From 9d487bb2fe029b369f362bdbe4697005061a4e5e Mon Sep 17 00:00:00 2001
From: Christian Grothoff <christian@grothoff.org>
Date: Sat, 6 Dec 2014 22:41:30 +0000
Subject: massive rework of scalarproduct service, splitting into Alice and Bob

---
 src/scalarproduct/gnunet-service-scalarproduct.h | 165 +++++++++++++++++++++++
 1 file changed, 165 insertions(+)
 create mode 100644 src/scalarproduct/gnunet-service-scalarproduct.h

(limited to 'src/scalarproduct/gnunet-service-scalarproduct.h')

diff --git a/src/scalarproduct/gnunet-service-scalarproduct.h b/src/scalarproduct/gnunet-service-scalarproduct.h
new file mode 100644
index 000000000..9a5008628
--- /dev/null
+++ b/src/scalarproduct/gnunet-service-scalarproduct.h
@@ -0,0 +1,165 @@
+/*
+     This file is part of GNUnet.
+     (C) 2013, 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.
+ */
+/**
+ * @file scalarproduct/gnunet-service-scalarproduct.h
+ * @brief scalarproduct service  P2P messages
+ * @author Christian M. Fuchs
+ * @author Christian Grothoff
+ */
+#ifndef GNUNET_SERVICE_SCALARPRODUCT_H
+#define GNUNET_SERVICE_SCALARPRODUCT_H
+
+/**
+ * Maximum count of elements we can put into a multipart message
+ */
+#define MULTIPART_ELEMENT_CAPACITY ((GNUNET_SERVER_MAX_MESSAGE_SIZE - 1 - sizeof (struct MultipartMessage)) / sizeof (struct GNUNET_CRYPTO_PaillierCiphertext))
+
+
+GNUNET_NETWORK_STRUCT_BEGIN
+
+/**
+ * Message type passed from requesting service Alice to responding
+ * service Bob to initiate a request and make Bob participate in our
+ * protocol.  Afterwards, Bob is expected to perform the set
+ * intersection with Alice. Once that has succeeded, Alice will
+ * send a `struct AliceCryptodataMessage *`.  Bob is not expected
+ * to respond via CADET in the meantime.
+ */
+struct ServiceRequestMessage
+{
+  /**
+   * Type is #GNUNET_MESSAGE_TYPE_SCALARPRODUCT_SESSION_INITIALIZATION
+   */
+  struct GNUNET_MessageHeader header;
+
+  /**
+   * For alignment. Always zero.
+   */
+  uint32_t reserved;
+
+  /**
+   * The transaction/session key used to identify a session
+   */
+  struct GNUNET_HashCode session_id;
+
+  /**
+   * Alice's public key
+   */
+  struct GNUNET_CRYPTO_PaillierPublicKey public_key;
+
+};
+
+
+/**
+ * Vector of Pallier-encrypted values sent by Alice to Bob
+ * (after set intersection).  Alice may send messages of this
+ * type repeatedly to transmit all values.
+ */
+struct AliceCryptodataMessage
+{
+  /**
+   * Type is #GNUNET_MESSAGE_TYPE_SCALARPRODUCT_ALICE_CRYPTODATA
+   */
+  struct GNUNET_MessageHeader header;
+
+  /**
+   * How many elements we appended to this message? In NBO.
+   */
+  uint32_t contained_element_count GNUNET_PACKED;
+
+  /**
+   * struct GNUNET_CRYPTO_PaillierCiphertext[contained_element_count]
+   */
+};
+
+
+/**
+ * Message type passed from responding service Bob to responding
+ * service Alice to complete a request and allow Alice to compute the
+ * result.  If Bob's reply does not fit into this one message, the
+ * conversation may be continued with `struct MultipartMessage`
+ * messages afterwards.
+ */
+struct ServiceResponseMessage
+{
+  /**
+   * GNUNET message header with type
+   * #GNUNET_MESSAGE_TYPE_SCALARPRODUCT_BOB_CRYPTODATA.
+   */
+  struct GNUNET_MessageHeader header;
+
+  /**
+   * How many elements the session input had (in NBO).
+   */
+  uint32_t total_element_count GNUNET_PACKED;
+
+  /**
+   * How many elements were included after the mask was applied
+   * including all multipart msgs (in NBO).
+   */
+  uint32_t used_element_count GNUNET_PACKED;
+
+  /**
+   * How many elements this individual message delivers (in NBO).
+   */
+  uint32_t contained_element_count GNUNET_PACKED;
+
+  /**
+   * The transaction/session key used to identify a session.
+   * FIXME: needed? CADET should already identify sessions!
+   */
+  struct GNUNET_HashCode key;
+
+  /**
+   * followed by s | s' | k[i][perm]
+   */
+};
+
+
+/**
+ * Multipart Message type passed between to supply additional elements
+ * for the peer.  Send from Bob to Alice with additional elements
+ * of k[i][perm] after his `struct ServiceResponseMessage *`.
+ * Once all k-values have been transmitted, Bob is finished and
+ * Alice can transmit the final result to the client.
+ */
+struct MultipartMessage
+{
+  /**
+   * GNUNET message header
+   */
+  struct GNUNET_MessageHeader header;
+
+  /**
+   * How many elements we supply within this message? In NBO.
+   */
+  uint32_t contained_element_count GNUNET_PACKED;
+
+  /**
+   * struct GNUNET_CRYPTO_PaillierCiphertext[multipart_element_count]
+   */
+};
+
+
+
+GNUNET_NETWORK_STRUCT_END
+
+
+#endif
-- 
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