| /* |
| * Copyright (c) 2012 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 SRC_VIDEO_ENGINE_TEST_AUTO_TEST_HELPERS_BIT_FLIP_ENCRYPTION_H_ |
| #define SRC_VIDEO_ENGINE_TEST_AUTO_TEST_HELPERS_BIT_FLIP_ENCRYPTION_H_ |
| |
| #include "common_types.h" |
| |
| // This encryption scheme will randomly flip bits every now and then in the |
| // input data. |
| class BitFlipEncryption : public webrtc::Encryption { |
| public: |
| // Args: |
| // rand_seed: the seed to initialize the test's random generator with. |
| // flip_probability: A number [0, 1] which is the percentage chance a bit |
| // gets flipped in a particular byte. |
| BitFlipEncryption(unsigned int rand_seed, float flip_probability); |
| |
| virtual void encrypt(int channel_no, unsigned char* in_data, |
| unsigned char* out_data, int bytes_in, int* bytes_out) { |
| FlipSomeBitsInData(in_data, out_data, bytes_in, bytes_out); |
| } |
| |
| virtual void decrypt(int channel_no, unsigned char* in_data, |
| unsigned char* out_data, int bytes_in, int* bytes_out) { |
| FlipSomeBitsInData(in_data, out_data, bytes_in, bytes_out); |
| } |
| |
| virtual void encrypt_rtcp(int channel_no, unsigned char* in_data, |
| unsigned char* out_data, int bytes_in, |
| int* bytes_out) { |
| FlipSomeBitsInData(in_data, out_data, bytes_in, bytes_out); |
| } |
| |
| virtual void decrypt_rtcp(int channel_no, unsigned char* in_data, |
| unsigned char* out_data, int bytes_in, |
| int* bytes_out) { |
| FlipSomeBitsInData(in_data, out_data, bytes_in, bytes_out); |
| } |
| |
| int64_t flip_count() const { return flip_count_; } |
| |
| private: |
| // The flip probability ([0, 1]). |
| float flip_probability_; |
| // The number of bits we've flipped so far. |
| int64_t flip_count_; |
| |
| // Flips some bits in the data at random. |
| void FlipSomeBitsInData(const unsigned char *in_data, unsigned char* out_data, |
| int bytes_in, int* bytes_out); |
| }; |
| |
| #endif // SRC_VIDEO_ENGINE_TEST_AUTO_TEST_HELPERS_BIT_FLIP_ENCRYPTION_H_ |