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diff --git a/src/chat/chat.h b/src/chat/chat.h
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+/*
+     This file is part of GNUnet
+     (C) 2008, 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 2, 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 chat/chat.h
+ * @brief support for chat
+ * @author Christian Grothoff
+ * @author Nathan Evans
+ * @author Vitaly Minko
+ */
+
+#ifndef CHAT_H
+#define CHAT_H
+
+#include "gnunet_chat_service.h"
+
+/**
+ * Constant IV since we generate a new session key per each message.
+ */
+#define INITVALUE "InitializationVectorValue"
+
+
+/**
+ * Client-service messages
+ */
+
+GNUNET_NETWORK_STRUCT_BEGIN
+
+/**
+ * Notification sent by service to client indicating that we've received a chat
+ * message.  After this struct, the remaining bytes are the actual text message.
+ * If the mesasge is private, then the text is encrypted, otherwise it's
+ * plaintext.
+ */
+struct ReceiveNotificationMessage
+{
+  /**
+   * Message type will be GNUNET_MESSAGE_TYPE_CHAT_MESSAGE_NOTIFICATION
+   */
+  struct GNUNET_MessageHeader header;
+
+  /**
+   * Message options, see GNUNET_CHAT_MsgOptions.
+   */
+  uint32_t msg_options GNUNET_PACKED;
+
+  /**
+   * Sequence number of the message (unique per sender).
+   */
+  uint32_t sequence_number GNUNET_PACKED;
+
+  /**
+   * For alignment (should be zero).
+   */
+  uint32_t reserved GNUNET_PACKED;
+
+  /**
+   * Timestamp of the message.
+   */
+  struct GNUNET_TIME_AbsoluteNBO timestamp;
+
+  /**
+   * Hash of the public key of the pseudonym of the sender of the message.
+   * Should be all zeros for anonymous.
+   */
+  GNUNET_HashCode sender;
+
+  /**
+   * The encrypted session key.
+   */
+  struct GNUNET_CRYPTO_RsaEncryptedData encrypted_key;
+
+};
+
+
+/**
+ * Request sent by client to transmit a chat message to another room members.
+ * After this struct, the remaining bytes are the actual message in plaintext.
+ * Private messages are encrypted on the service side.
+ */
+struct TransmitRequestMessage
+{
+  /**
+   * Message type will be GNUNET_MESSAGE_TYPE_CHAT_TRANSMIT_REQUEST
+   */
+  struct GNUNET_MessageHeader header;
+
+  /**
+   * For alignment (should be zero).
+   */
+  uint32_t reserved GNUNET_PACKED;
+
+  /**
+   * Signature confirming receipt.  Signature covers everything from header
+   * through content.
+   */
+  struct GNUNET_CRYPTO_RsaSignature signature;
+
+  /**
+   * What is being signed and why?
+   */
+  struct GNUNET_CRYPTO_RsaSignaturePurpose purpose;
+
+  /**
+   * Desired message options, see GNUNET_CHAT_MsgOptions.
+   */
+  uint32_t msg_options GNUNET_PACKED;
+
+  /**
+   * Sequence number of the message (unique per sender).
+   */
+  uint32_t sequence_number GNUNET_PACKED;
+
+  /**
+   * Timestamp of the message.
+   */
+  struct GNUNET_TIME_AbsoluteNBO timestamp;
+
+  /**
+   * Who should receive this message?  Set to all zeros for "everyone".
+   */
+  GNUNET_HashCode target;
+
+};
+
+
+/**
+ * Receipt sent from a message receiver to the service to confirm delivery of
+ * a chat message and from the service to sender of the original message to
+ * acknowledge delivery.
+ */
+struct ConfirmationReceiptMessage
+{
+  /**
+   * Message type will be
+   * GNUNET_MESSAGE_TYPE_CHAT_CONFIRMATION_RECEIPT when sending from client,
+   * GNUNET_MESSAGE_TYPE_CHAT_CONFIRMATION_NOTIFICATION when sending to client.
+   */
+  struct GNUNET_MessageHeader header;
+
+  /**
+   * For alignment (should be zero).
+   */
+  uint32_t reserved GNUNET_PACKED;
+
+  /**
+   * Signature confirming receipt.  Signature covers everything from header
+   * through content.
+   */
+  struct GNUNET_CRYPTO_RsaSignature signature;
+
+  /**
+   * What is being signed and why?
+   */
+  struct GNUNET_CRYPTO_RsaSignaturePurpose purpose;
+
+  /**
+   * Sequence number of the original message.
+   */
+  uint32_t sequence_number GNUNET_PACKED;
+
+  /**
+   * For alignment (should be zero).
+   */
+  uint32_t reserved2 GNUNET_PACKED;
+
+  /**
+   * Time of receipt.
+   */
+  struct GNUNET_TIME_AbsoluteNBO timestamp;
+
+  /**
+   * Who is confirming the receipt?
+   */
+  GNUNET_HashCode target;
+
+  /**
+   * Who is the author of the chat message?
+   */
+  GNUNET_HashCode author;
+
+  /**
+   * Hash of the (possibly encrypted) content.
+   */
+  GNUNET_HashCode content;
+
+};
+
+
+/**
+ * Message send from client to daemon to join a chat room.
+ * This struct is followed by the room name and then
+ * the serialized ECRS meta data describing the new member.
+ */
+struct JoinRequestMessage
+{
+  /**
+   * Message type will be GNUNET_MESSAGE_TYPE_CHAT_JOIN_REQUEST
+   */
+  struct GNUNET_MessageHeader header;
+
+  /**
+   * Options.  Set all options that this client is willing to receive.
+   * For example, if the client does not want to receive anonymous or
+   * OTR messages but is willing to generate acknowledgements and
+   * receive private messages, this should be set to
+   * GNUNET_CHAT_MSG_PRIVATE | GNUNET_CHAT_MSG_ACKNOWLEDGED.
+   */
+  uint32_t msg_options GNUNET_PACKED;
+
+  /**
+   * Length of the room name.
+   */
+  uint16_t room_name_len GNUNET_PACKED;
+
+  /**
+   * For alignment (should be zero).
+   */
+  uint16_t reserved GNUNET_PACKED;
+  uint32_t reserved2 GNUNET_PACKED;
+
+  /**
+   * Public key of the joining member.
+   */
+  struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded public_key;
+
+};
+
+
+/**
+ * Message send by server to client to indicate joining of another room member.
+ * This struct is followed by the serialized ECRS MetaData describing the new
+ * member.
+ */
+struct JoinNotificationMessage
+{
+  /**
+   * Message type will be GNUNET_MESSAGE_TYPE_CHAT_JOIN_NOTIFICATION
+   */
+  struct GNUNET_MessageHeader header;
+
+  /**
+   * Options.  Set to all options that the new user is willing to
+   * process.  For example, if the client does not want to receive
+   * anonymous or OTR messages but is willing to generate
+   * acknowledgements and receive private messages, this should be set
+   * to GNUNET_CHAT_MSG_PRIVATE | GNUNET_CHAT_MSG_ACKNOWLEDGED.
+   */
+  uint32_t msg_options GNUNET_PACKED;
+
+  /**
+   * Public key of the new user.
+   */
+  struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded public_key;
+
+};
+
+
+/**
+ * Message send by server to client to indicate leaving of another room member.
+ */
+struct LeaveNotificationMessage
+{
+  /**
+   * Message type will be GNUNET_MESSAGE_TYPE_CHAT_LEAVE_NOTIFICATION
+   */
+  struct GNUNET_MessageHeader header;
+
+  /**
+   * Reserved (for alignment).
+   */
+  uint32_t reserved GNUNET_PACKED;
+
+  /**
+   * Who is leaving?
+   */
+  struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded user;
+
+};
+
+
+/**
+ * Peer-to-peer messages
+ */
+
+/**
+ * Message send by one peer to another to indicate joining of another room
+ * member.  This struct is followed by the room name and then the serialized
+ * ECRS MetaData describing the new member.
+ */
+struct P2PJoinNotificationMessage
+{
+  /**
+   * Message type will be GNUNET_MESSAGE_TYPE_CHAT_P2P_JOIN_NOTIFICATION
+   */
+  struct GNUNET_MessageHeader header;
+
+  /**
+   * Options.  Set all options that this client is willing to receive.
+   * For example, if the client does not want to receive anonymous or
+   * OTR messages but is willing to generate acknowledgements and
+   * receive private messages, this should be set to
+   * GNUNET_CHAT_MSG_PRIVATE | GNUNET_CHAT_MSG_ACKNOWLEDGED.
+   */
+  uint32_t msg_options GNUNET_PACKED;
+
+  /**
+   * Length of the room name.
+   */
+  uint16_t room_name_len GNUNET_PACKED;
+
+  /**
+   * Reserved (should be zero).
+   */
+  uint16_t reserved GNUNET_PACKED;
+  uint32_t reserved2 GNUNET_PACKED;
+
+  /**
+   * Public key of the joining member.
+   */
+  struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded public_key;
+
+};
+
+
+/**
+ * Message send by one peer to another to indicate leaving of another room
+ * member.
+ */
+struct P2PLeaveNotificationMessage
+{
+  /**
+   * Message type will be GNUNET_MESSAGE_TYPE_CHAT_P2P_LEAVE_NOTIFICATION
+   */
+  struct GNUNET_MessageHeader header;
+
+  /**
+   * Reserved (for alignment).
+   */
+  uint32_t reserved GNUNET_PACKED;
+
+  /**
+   * Who is leaving?
+   */
+  struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded user;
+
+};
+
+
+/**
+ * Message send by one peer to another to indicate receiving of a chat message.
+ * This struct is followed by the room name (only if the message is anonymous)
+ * and then the remaining bytes are the actual text message.  If the mesasge is
+ * private, then the text is encrypted, otherwise it's plaintext.
+ */
+struct P2PReceiveNotificationMessage
+{
+  /**
+   * Message type will be GNUNET_MESSAGE_TYPE_CHAT_P2P_MESSAGE_NOTIFICATION
+   */
+  struct GNUNET_MessageHeader header;
+
+  /**
+   * Message options, see GNUNET_CHAT_MsgOptions.
+   */
+  uint32_t msg_options GNUNET_PACKED;
+
+  /**
+   * Sequence number of the message (unique per sender).
+   */
+  uint32_t sequence_number GNUNET_PACKED;
+
+  /**
+   * Length of the room name. This is only used for anonymous messages.
+   */
+  uint16_t room_name_len GNUNET_PACKED;
+
+  /**
+   * Reserved (for alignment).
+   */
+  uint16_t reserved GNUNET_PACKED;
+
+  /**
+   * Timestamp of the message.
+   */
+  struct GNUNET_TIME_AbsoluteNBO timestamp;
+
+  /**
+   * Hash of the public key of the pseudonym of the sender of the message
+   * Should be all zeros for anonymous.
+   */
+  GNUNET_HashCode sender;
+
+  /**
+   * Who should receive this message?  Set to all zeros for "everyone".
+   */
+  GNUNET_HashCode target;
+
+  /**
+   * The encrypted session key.
+   */
+  struct GNUNET_CRYPTO_RsaEncryptedData encrypted_key;
+
+};
+
+
+/**
+ * Receipt sent from one peer to another to confirm delivery of a chat message.
+ */
+struct P2PConfirmationReceiptMessage
+{
+  /**
+   * Message type will be GNUNET_MESSAGE_TYPE_CHAT_P2P_CONFIRMATION_RECEIPT
+   */
+  struct GNUNET_MessageHeader header;
+
+  /**
+   * For alignment (should be zero).
+   */
+  uint32_t reserved GNUNET_PACKED;
+
+  /**
+   * Signature confirming receipt.  Signature covers everything from header
+   * through content.
+   */
+  struct GNUNET_CRYPTO_RsaSignature signature;
+
+  /**
+   * What is being signed and why?
+   */
+  struct GNUNET_CRYPTO_RsaSignaturePurpose purpose;
+
+  /**
+   * Sequence number of the original message.
+   */
+  uint32_t msg_sequence_number GNUNET_PACKED;
+
+  /**
+   * Sequence number of the receipt.
+   */
+  uint32_t sequence_number GNUNET_PACKED;
+
+  /**
+   * Time of receipt.
+   */
+  struct GNUNET_TIME_AbsoluteNBO timestamp;
+
+  /**
+   * Who is confirming the receipt?
+   */
+  GNUNET_HashCode target;
+
+  /**
+   * Who is the author of the chat message?
+   */
+  GNUNET_HashCode author;
+
+  /**
+   * Hash of the (possibly encrypted) content.
+   */
+  GNUNET_HashCode content;
+
+};
+GNUNET_NETWORK_STRUCT_END
+
+#endif
+
+/* end of chat.h */