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3dab079c7c
add GCM ciphers to SrtpFlow Differential Revision: https://phabricator.services.mozilla.com/D5731 --HG-- extra : moz-landing-system : lando
72 lines
2.1 KiB
C++
72 lines
2.1 KiB
C++
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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// Original author: ekr@rtfm.com
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#ifndef srtpflow_h__
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#define srtpflow_h__
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#include "mozilla/RefPtr.h"
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#include "nsISupportsImpl.h"
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#include "srtp.h"
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namespace mozilla {
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#define SRTP_ICM_MASTER_KEY_LENGTH 16
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#define SRTP_ICM_MASTER_SALT_LENGTH 14
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#define SRTP_ICM_MAX_MASTER_LEGNTH (SRTP_ICM_MASTER_KEY_LENGTH + SRTP_ICM_MASTER_SALT_LENGTH)
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#define SRTP_GCM_MASTER_KEY_LENGTH 32
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#define SRTP_GCM_MASTER_SALT_LENGTH 12
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#define SRTP_GCM_MAX_MASTER_LEGNTH (SRTP_GCM_MASTER_KEY_LENGTH + SRTP_GCM_MASTER_SALT_LENGTH)
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#define SRTP_MIN_KEY_LENGTH SRTP_ICM_MAX_MASTER_LEGNTH
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#define SRTP_MAX_KEY_LENGTH SRTP_GCM_MAX_MASTER_LEGNTH
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// SRTCP requires an auth tag *plus* a 4-byte index-plus-'E'-bit value (see
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// RFC 3711)
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#define SRTP_MAX_EXPANSION (SRTP_MAX_TRAILER_LEN+4)
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class SrtpFlow {
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~SrtpFlow();
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public:
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static unsigned int KeySize(int cipher_suite);
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static unsigned int SaltSize(int cipher_suite);
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static RefPtr<SrtpFlow> Create(int cipher_suite,
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bool inbound,
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const void *key,
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size_t key_len);
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nsresult ProtectRtp(void *in, int in_len,
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int max_len, int *out_len);
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nsresult UnprotectRtp(void *in, int in_len,
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int max_len, int *out_len);
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nsresult ProtectRtcp(void *in, int in_len,
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int max_len, int *out_len);
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nsresult UnprotectRtcp(void *in, int in_len,
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int max_len, int *out_len);
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NS_INLINE_DECL_THREADSAFE_REFCOUNTING(SrtpFlow)
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static void srtp_event_handler(srtp_event_data_t *data);
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private:
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SrtpFlow() : session_(nullptr) {}
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nsresult CheckInputs(bool protect, void *in, int in_len,
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int max_len, int *out_len);
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static nsresult Init();
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static bool initialized; // Was libsrtp initialized? Only happens once.
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srtp_t session_;
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};
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} // End of namespace
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#endif
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