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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this file,
* You can obtain one at http://mozilla.org/MPL/2.0/. */
// Original author: ekr@rtfm.com
#ifndef srtpflow_h__
#define srtpflow_h__
#include "ssl.h"
#include "sslproto.h"
#include "mozilla/RefPtr.h"
#include "nsISupportsImpl.h"
typedef struct srtp_policy_t srtp_policy_t;
typedef struct srtp_ctx_t *srtp_t;
typedef struct srtp_event_data_t srtp_event_data_t;
namespace mozilla {
#define SRTP_MASTER_KEY_LENGTH 16
#define SRTP_MASTER_SALT_LENGTH 14
#define SRTP_TOTAL_KEY_LENGTH (SRTP_MASTER_KEY_LENGTH + SRTP_MASTER_SALT_LENGTH)
// SRTCP requires an auth tag *plus* a 4-byte index-plus-'E'-bit value (see
// RFC 3711)
#define SRTP_MAX_EXPANSION (SRTP_MAX_TRAILER_LEN+4)
class SrtpFlow {
~SrtpFlow();
public:
static RefPtr<SrtpFlow> Create(int cipher_suite,
bool inbound,
const void *key,
size_t key_len);
nsresult ProtectRtp(void *in, int in_len,
int max_len, int *out_len);
nsresult UnprotectRtp(void *in, int in_len,
int max_len, int *out_len);
nsresult ProtectRtcp(void *in, int in_len,
int max_len, int *out_len);
nsresult UnprotectRtcp(void *in, int in_len,
int max_len, int *out_len);
NS_INLINE_DECL_THREADSAFE_REFCOUNTING(SrtpFlow)
static void srtp_event_handler(srtp_event_data_t *data);
private:
SrtpFlow() : session_(nullptr) {}
nsresult CheckInputs(bool protect, void *in, int in_len,
int max_len, int *out_len);
static nsresult Init();
static bool initialized; // Was libsrtp initialized? Only happens once.
srtp_t session_;
};
} // End of namespace
#endif
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