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+/* $Id$ */
+/* 
+ * Copyright (C) 2008-2011 Teluu Inc. (http://www.teluu.com)
+ * Copyright (C) 2003-2008 Benny Prijono <benny@prijono.org>
+ *
+ * This program 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 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA 
+ */
+#ifndef __PJMEDIA_TRANSPORT_SRTP_H__
+#define __PJMEDIA_TRANSPORT_SRTP_H__
+
+/**
+ * @file transport_srtp.h
+ * @brief Secure RTP (SRTP) transport.
+ */
+
+#include <pjmedia/transport.h>
+
+
+/**
+ * @defgroup PJMEDIA_TRANSPORT_SRTP Secure RTP (SRTP) Media Transport
+ * @ingroup PJMEDIA_TRANSPORT
+ * @brief Media transport adapter to add SRTP feature to existing transports
+ * @{
+ *
+ * This module implements SRTP as described by RFC 3711, using RFC 4568 as
+ * key exchange method. It implements \ref PJMEDIA_TRANSPORT to integrate
+ * with the rest of PJMEDIA framework.
+ *
+ * As we know, media transport is separated from the stream object (which 
+ * does the encoding/decoding of PCM frames, (de)packetization of RTP/RTCP 
+ * packets, and de-jitter buffering). The connection between stream and media
+ * transport is established when the stream is created (we need to specify 
+ * media transport during stream creation), and the interconnection can be 
+ * depicted from the diagram below:
+ *
+   \image html media-transport.PNG
+
+ * I think the diagram above is self-explanatory.
+ *
+ * SRTP functionality is implemented as some kind of "adapter", which is 
+ * plugged between the stream and the actual media transport that does 
+ * sending/receiving RTP/RTCP packets. When SRTP is used, the interconnection
+ * between stream and transport is like the diagram below:
+ *
+    \image html media-srtp-transport.PNG
+
+ * So to stream, the SRTP transport behaves as if it is a media transport 
+ * (because it is a media transport), and to the media transport it behaves
+ * as if it is a stream. The SRTP object then forwards RTP packets back and
+ * forth between stream and the actual transport, encrypting/decrypting 
+ * the RTP/RTCP packets as necessary.
+ * 
+ * The neat thing about this design is the SRTP "adapter" then can be used 
+ * to encrypt any kind of media transports. We currently have UDP and ICE 
+ * media transports that can benefit SRTP, and we could add SRTP to any 
+ * media transports that will be added in the future. 
+ */
+
+PJ_BEGIN_DECL
+
+
+/**
+ * Crypto option.
+ */
+typedef enum pjmedia_srtp_crypto_option
+{
+    /** When this flag is specified, encryption will be disabled. */
+    PJMEDIA_SRTP_NO_ENCRYPTION  = 1,
+
+    /** When this flag is specified, authentication will be disabled. */
+    PJMEDIA_SRTP_NO_AUTHENTICATION  = 2
+
+} pjmedia_srtp_crypto_option;
+
+
+/**
+ * This structure describes an individual crypto setting.
+ */
+typedef struct pjmedia_srtp_crypto
+{
+    /** Optional key. If empty, a random key will be autogenerated. */
+    pj_str_t	key;
+
+    /** Crypto name.   */
+    pj_str_t	name;
+
+    /** Flags, bitmask from #pjmedia_srtp_crypto_option */
+    unsigned	flags;
+
+} pjmedia_srtp_crypto;
+
+
+/**
+ * This enumeration specifies the behavior of the SRTP transport regarding
+ * media security offer and answer.
+ */
+typedef enum pjmedia_srtp_use
+{
+    /**
+     * When this flag is specified, SRTP will be disabled, and the transport
+     * will reject RTP/SAVP offer.
+     */
+    PJMEDIA_SRTP_DISABLED,
+
+    /**
+     * When this flag is specified, SRTP will be advertised as optional and
+     * incoming SRTP offer will be accepted.
+     */
+    PJMEDIA_SRTP_OPTIONAL,
+
+    /**
+     * When this flag is specified, the transport will require that RTP/SAVP
+     * media shall be used.
+     */
+    PJMEDIA_SRTP_MANDATORY
+
+} pjmedia_srtp_use;
+
+
+/**
+ * Settings to be given when creating SRTP transport. Application should call
+ * #pjmedia_srtp_setting_default() to initialize this structure with its 
+ * default values.
+ */
+typedef struct pjmedia_srtp_setting
+{
+    /**
+     * Specify the usage policy. Default is PJMEDIA_SRTP_OPTIONAL.
+     */
+    pjmedia_srtp_use		use;
+
+    /**
+     * Specify whether the SRTP transport should close the member transport 
+     * when it is destroyed. Default: PJ_TRUE.
+     */
+    pj_bool_t			close_member_tp;
+
+    /**
+     * Specify the number of crypto suite settings.
+     */
+    unsigned			crypto_count;
+
+    /**
+     * Specify individual crypto suite setting.
+     */
+    pjmedia_srtp_crypto		crypto[8];
+
+} pjmedia_srtp_setting;
+
+
+/**
+ * This structure specifies SRTP transport specific info. This will fit
+ * into \a buffer field of pjmedia_transport_specific_info.
+ */
+typedef struct pjmedia_srtp_info
+{
+    /**
+     * Specify whether the SRTP transport is active for SRTP session.
+     */
+    pj_bool_t			active;
+
+    /**
+     * Specify the policy used by the SRTP session for receive direction.
+     */
+    pjmedia_srtp_crypto		rx_policy;
+
+    /**
+     * Specify the policy used by the SRTP session for transmit direction.
+     */
+    pjmedia_srtp_crypto		tx_policy;
+
+    /**
+     * Specify the usage policy.
+     */
+    pjmedia_srtp_use		use;
+
+    /**
+     * Specify the peer's usage policy.
+     */
+    pjmedia_srtp_use		peer_use;
+
+} pjmedia_srtp_info;
+
+
+/**
+ * Initialize SRTP library. This function should be called before
+ * any SRTP functions, however calling #pjmedia_transport_srtp_create() 
+ * will also invoke this function. This function will also register SRTP
+ * library deinitialization to #pj_atexit(), so the deinitialization
+ * of SRTP library will be performed automatically by PJLIB destructor.
+ *
+ * @param endpt	    The media endpoint instance.
+ *
+ * @return	    PJ_SUCCESS on success.
+ */
+PJ_DECL(pj_status_t) pjmedia_srtp_init_lib(pjmedia_endpt *endpt);
+
+
+/**
+ * Initialize SRTP setting with its default values.
+ *
+ * @param opt	SRTP setting to be initialized.
+ */
+PJ_DECL(void) pjmedia_srtp_setting_default(pjmedia_srtp_setting *opt);
+
+
+/**
+ * Create an SRTP media transport.
+ *
+ * @param endpt	    The media endpoint instance.
+ * @param tp	    The actual media transport to send and receive 
+ *		    RTP/RTCP packets. This media transport will be
+ *		    kept as member transport of this SRTP instance.
+ * @param opt	    Optional settings. If NULL is given, default
+ *		    settings will be used.
+ * @param p_tp	    Pointer to receive the transport SRTP instance.
+ *
+ * @return	    PJ_SUCCESS on success.
+ */
+PJ_DECL(pj_status_t) pjmedia_transport_srtp_create(
+				       pjmedia_endpt *endpt,
+				       pjmedia_transport *tp,
+				       const pjmedia_srtp_setting *opt,
+				       pjmedia_transport **p_tp);
+
+
+/**
+ * Manually start SRTP session with the given parameters. Application only
+ * needs to call this function when the SRTP transport is used without SDP
+ * offer/answer. When SDP offer/answer framework is used, the SRTP transport
+ * will be started/stopped by #pjmedia_transport_media_start() and 
+ * #pjmedia_transport_media_stop() respectively.
+ *
+ * Please note that even if an RTP stream is only one direction, application
+ * will still need to provide both crypto suites, because it is needed by 
+ * RTCP.
+
+ * If application specifies the crypto keys, the keys for transmit and receive
+ * direction MUST be different.
+ *
+ * @param srtp	    The SRTP transport.
+ * @param tx	    Crypto suite setting for transmit direction.
+ * @param rx	    Crypto suite setting for receive direction.
+ *
+ * @return	    PJ_SUCCESS on success.
+ */
+PJ_DECL(pj_status_t) pjmedia_transport_srtp_start(
+					    pjmedia_transport *srtp,
+					    const pjmedia_srtp_crypto *tx,
+					    const pjmedia_srtp_crypto *rx);
+
+/**
+ * Stop SRTP session.
+ *
+ * @param srtp	    The SRTP media transport.
+ *
+ * @return	    PJ_SUCCESS on success.
+ *
+ * @see #pjmedia_transport_srtp_start() 
+ */
+PJ_DECL(pj_status_t) pjmedia_transport_srtp_stop(pjmedia_transport *srtp);
+
+
+/**
+ * This is a utility function to decrypt SRTP packet using SRTP transport.
+ * This function is not part of SRTP transport's API, but it can be used
+ * to decrypt SRTP packets from non-network (for example, from a saved file)
+ * without having to use the transport framework. See pcaputil.c in the
+ * samples collection on how to use this function.
+ *
+ * @param tp		The SRTP transport.
+ * @param is_rtp	Set to non-zero if the packet is SRTP, otherwise set
+ *			to zero if the packet is SRTCP.
+ * @param pkt		On input, it contains SRTP or SRTCP packet. On
+ *			output, it contains the decrypted RTP/RTCP packet.
+ * @param pkt_len	On input, specify the length of the buffer. On
+ *			output, it will be filled with the actual length
+ *			of decrypted packet.
+ *
+ * @return		PJ_SUCCESS on success.
+ */
+PJ_DECL(pj_status_t) pjmedia_transport_srtp_decrypt_pkt(pjmedia_transport *tp,
+							pj_bool_t is_rtp,
+							void *pkt,
+							int *pkt_len);
+
+
+/**
+ * Query member transport of SRTP.
+ *
+ * @param srtp		    The SRTP media transport.
+ *
+ * @return		    member media transport.
+ */
+PJ_DECL(pjmedia_transport*) pjmedia_transport_srtp_get_member(
+						    pjmedia_transport *srtp);
+
+
+PJ_END_DECL
+
+/**
+ * @}
+ */
+
+#endif /* __PJMEDIA_TRANSPORT_SRTP_H__ */