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diff --git a/src/scalarproduct/gnunet-service-scalarproduct-ecc.h b/src/scalarproduct/gnunet-service-scalarproduct-ecc.h
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+/*
+     This file is part of GNUnet.
+     Copyright (C) 2015 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., 51 Franklin Street, Fifth Floor,
+     Boston, MA 02110-1301, USA.
+ */
+/**
+ * @file scalarproduct/gnunet-service-scalarproduct-ecc.h
+ * @brief scalarproduct service  P2P messages
+ * @author Christian M. Fuchs
+ * @author Christian Grothoff
+ */
+#ifndef GNUNET_SERVICE_SCALARPRODUCT_ECC_H
+#define GNUNET_SERVICE_SCALARPRODUCT_ECC_H
+
+
+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 EccServiceRequestMessage
+{
+  /**
+   * Type is #GNUNET_MESSAGE_TYPE_SCALARPRODUCT_ECC_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;
+
+};
+
+
+/**
+ * Vector of ECC-encrypted values sent by Alice to Bob
+ * (after set intersection).  Alice may send messages of this
+ * type repeatedly to transmit all values.
+ */
+struct EccAliceCryptodataMessage
+{
+  /**
+   * Type is #GNUNET_MESSAGE_TYPE_SCALARPRODUCT_ECC_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_EccPoint[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 BobCryptodataMultipartMessage`
+ * messages afterwards.
+ */
+struct EccBobCryptodataMessage
+{
+  /**
+   * GNUNET message header with type
+   * #GNUNET_MESSAGE_TYPE_SCALARPRODUCT_ECC_BOB_CRYPTODATA.
+   */
+  struct GNUNET_MessageHeader header;
+
+  /**
+   * How many elements this individual message delivers (in NBO),
+   * always TWO.
+   */
+  uint32_t contained_element_count GNUNET_PACKED;
+
+  /**
+   * The product of the g_i^{b_i} values.
+   */
+  struct GNUNET_CRYPTO_EccPoint prod_g_i_b_i;
+
+  /**
+   * The product of the h_i^{b_i} values.
+   */
+  struct GNUNET_CRYPTO_EccPoint prod_h_i_b_i;
+
+};
+
+
+GNUNET_NETWORK_STRUCT_END
+
+
+#endif