The Tor Browser: media/webrtc/signaling/src/mediapipeline/SrtpFlow.h@6474c204b198

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

     1 /* This Source Code Form is subject to the terms of the Mozilla Public

     2  * License, v. 2.0. If a copy of the MPL was not distributed with this file,

     3  * You can obtain one at http://mozilla.org/MPL/2.0/. */

     5 // Original author: ekr@rtfm.com

     7 #ifndef srtpflow_h__

     8 #define srtpflow_h__

    10 #include "ssl.h"

    11 #include "sslproto.h"

    12 #include "mozilla/RefPtr.h"

    13 #include "nsISupportsImpl.h"

    15 typedef struct srtp_policy_t srtp_policy_t;

    16 typedef struct srtp_ctx_t *srtp_t;

    17 typedef struct srtp_event_data_t srtp_event_data_t;

    19 namespace mozilla {

    21 #define SRTP_MASTER_KEY_LENGTH 16

    22 #define SRTP_MASTER_SALT_LENGTH 14

    23 #define SRTP_TOTAL_KEY_LENGTH (SRTP_MASTER_KEY_LENGTH + SRTP_MASTER_SALT_LENGTH)

    25 // For some reason libsrtp increases packet size by > 12 for RTCP even though

    26 // the doc claims otherwise.

    27 #define SRTP_MAX_EXPANSION 20

    30 class SrtpFlow {

    31  public:

    32   ~SrtpFlow();

    35   static mozilla::RefPtr<SrtpFlow> Create(int cipher_suite,

    36                                           bool inbound,

    37                                           const void *key,

    38                                           size_t key_len);

    40   nsresult ProtectRtp(void *in, int in_len,

    41                       int max_len, int *out_len);

    42   nsresult UnprotectRtp(void *in, int in_len,

    43                         int max_len, int *out_len);

    44   nsresult ProtectRtcp(void *in, int in_len,

    45                        int max_len, int *out_len);

    46   nsresult UnprotectRtcp(void *in, int in_len,

    47                          int max_len, int *out_len);

    49   NS_INLINE_DECL_THREADSAFE_REFCOUNTING(SrtpFlow)

    51   static void srtp_event_handler(srtp_event_data_t *data);

    54  private:

    55   SrtpFlow() : session_(nullptr) {}

    57   nsresult CheckInputs(bool protect, void *in, int in_len,

    58                        int max_len, int *out_len);

    60   static nsresult Init();

    61   static bool initialized;  // Was libsrtp initialized? Only happens once.

    63   srtp_t session_;

    64 };

    66 }  // End of namespace

    67 #endif

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