1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
|
/*
* Copyright 2018 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#ifndef API_CRYPTO_FRAME_ENCRYPTOR_INTERFACE_H_
#define API_CRYPTO_FRAME_ENCRYPTOR_INTERFACE_H_
#include "api/array_view.h"
#include "api/media_types.h"
#include "rtc_base/ref_count.h"
namespace webrtc {
// FrameEncryptorInterface allows users to provide a custom encryption
// implementation to encrypt all outgoing audio and video frames. The user must
// also provide a FrameDecryptorInterface to be able to decrypt the frames on
// the receiving device. Note this is an additional layer of encryption in
// addition to the standard SRTP mechanism and is not intended to be used
// without it. Implementations of this interface will have the same lifetime as
// the RTPSenders it is attached to. Additional data may be null.
class FrameEncryptorInterface : public rtc::RefCountInterface {
public:
~FrameEncryptorInterface() override {}
// Attempts to encrypt the provided frame. You may assume the encrypted_frame
// will match the size returned by GetMaxCiphertextByteSize for a give frame.
// You may assume that the frames will arrive in order if SRTP is enabled.
// The ssrc will simply identify which stream the frame is travelling on. You
// must set bytes_written to the number of bytes you wrote in the
// encrypted_frame. 0 must be returned if successful all other numbers can be
// selected by the implementer to represent error codes.
virtual int Encrypt(cricket::MediaType media_type,
uint32_t ssrc,
rtc::ArrayView<const uint8_t> additional_data,
rtc::ArrayView<const uint8_t> frame,
rtc::ArrayView<uint8_t> encrypted_frame,
size_t* bytes_written) = 0;
// Returns the total required length in bytes for the output of the
// encryption. This can be larger than the actual number of bytes you need but
// must never be smaller as it informs the size of the encrypted_frame buffer.
virtual size_t GetMaxCiphertextByteSize(cricket::MediaType media_type,
size_t frame_size) = 0;
};
} // namespace webrtc
#endif // API_CRYPTO_FRAME_ENCRYPTOR_INTERFACE_H_
|
