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diff --git a/src/core/gnunet-service-core_kx.h b/src/core/gnunet-service-core_kx.h
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+/*
+     This file is part of GNUnet.
+     (C) 2009, 2010, 2011 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 core/gnunet-service-core_kx.h
+ * @brief code for managing the key exchange (SET_KEY, PING, PONG) with other peers
+ * @author Christian Grothoff
+ */
+#ifndef GNUNET_SERVICE_CORE_KX_H
+#define GNUNET_SERVICE_CORE_KX_H
+
+#include "gnunet_util_lib.h"
+#include "gnunet_transport_service.h"
+
+
+/**
+ * Information about the status of a key exchange with another peer.
+ */
+struct GSC_KeyExchangeInfo;
+
+
+/**
+ * We received a SET_KEY message.  Validate and update
+ * our key material and status.
+ *
+ * @param kx key exchange status for the corresponding peer
+ * @param msg the set key message we received
+ */
+void
+GSC_KX_handle_set_key (struct GSC_KeyExchangeInfo *kx,
+                       const struct GNUNET_MessageHeader *msg);
+
+
+/**
+ * We received a PING message.  Validate and transmit
+ * a PONG message.
+ *
+ * @param kx key exchange status for the corresponding peer
+ * @param msg the encrypted PING message itself
+ */
+void
+GSC_KX_handle_ping (struct GSC_KeyExchangeInfo *kx,
+                    const struct GNUNET_MessageHeader *msg);
+
+
+/**
+ * We received a PONG message.  Validate and update our status.
+ *
+ * @param kx key exchange status for the corresponding peer
+ * @param msg the encrypted PONG message itself
+ */
+void
+GSC_KX_handle_pong (struct GSC_KeyExchangeInfo *kx,
+                    const struct GNUNET_MessageHeader *msg);
+
+
+/**
+ * Encrypt and transmit a message with the given payload.
+ *
+ * @param kx key exchange context
+ * @param payload payload of the message
+ * @param payload_size number of bytes in 'payload'
+ */
+void
+GSC_KX_encrypt_and_transmit (struct GSC_KeyExchangeInfo *kx,
+                             const void *payload, size_t payload_size);
+
+
+/**
+ * We received an encrypted message.  Decrypt, validate and
+ * pass on to the appropriate clients.
+ *
+ * @param kx key exchange information context
+ * @param msg encrypted message
+ * @param atsi performance data
+ * @param atsi_count number of entries in ats (excluding 0-termination)
+ */
+void
+GSC_KX_handle_encrypted_message (struct GSC_KeyExchangeInfo *kx,
+                                 const struct GNUNET_MessageHeader *msg,
+                                 const struct GNUNET_ATS_Information *atsi,
+                                 uint32_t atsi_count);
+
+
+/**
+ * Start the key exchange with the given peer.
+ *
+ * @param pid identity of the peer to do a key exchange with
+ * @return key exchange information context
+ */
+struct GSC_KeyExchangeInfo *
+GSC_KX_start (const struct GNUNET_PeerIdentity *pid);
+
+
+/**
+ * Stop key exchange with the given peer.  Clean up key material.
+ *
+ * @param kx key exchange to stop
+ */
+void
+GSC_KX_stop (struct GSC_KeyExchangeInfo *kx);
+
+
+/**
+ * Initialize KX subsystem.
+ *
+ * @return GNUNET_OK on success, GNUNET_SYSERR on failure
+ */
+int
+GSC_KX_init (void);
+
+
+/**
+ * Shutdown KX subsystem.
+ */
+void
+GSC_KX_done (void);
+
+#endif
+/* end of gnunet-service-core_kx.h */