OLD | NEW |
---|---|
(Empty) | |
1 // Copyright (c) 2013 The Chromium Authors. All rights reserved. | |
2 // Use of this source code is governed by a BSD-style license that can be | |
3 // found in the LICENSE file. | |
4 | |
5 #ifndef COMPONENTS_RAPPOR_BYTE_VECTOR_UTILS_H_ | |
6 #define COMPONENTS_RAPPOR_BYTE_VECTOR_UTILS_H_ | |
7 | |
8 #include <stddef.h> | |
9 #include <stdint.h> | |
10 #include <vector> | |
11 | |
12 #include "components/rappor/rappor_parameters.h" | |
13 #include "crypto/hmac.h" | |
14 | |
15 namespace rappor { | |
16 | |
17 // A vector of one byte integers used to store a set of binary bits. | |
18 typedef std::vector<uint8_t> ByteVector; | |
19 | |
20 // Bitwise operations on ByteVectors. These methods modify the lhs to be the | |
21 // result of the bitwise AND, OR, or AND NOT. | |
22 ByteVector* ByteVectorAnd(ByteVector* lhs, const ByteVector& rhs); | |
Alexei Svitkine (slow)
2014/01/09 19:23:09
Per style guide, non-const parameters should be la
Steven Holte
2014/01/09 22:03:01
Done.
| |
23 ByteVector* ByteVectorOr(ByteVector* lhs, const ByteVector& rhs); | |
24 ByteVector* ByteVectorMerge(ByteVector* lhs, | |
Alexei Svitkine (slow)
2014/01/09 19:23:09
This needs its own more specific comment to explai
Steven Holte
2014/01/09 22:03:01
Done.
| |
25 const ByteVector& rhs, | |
26 const ByteVector& mask); | |
27 | |
28 // A utility object for generating random binary data with different | |
29 // likelihood of bits being true. | |
30 class ByteVectorGenerator { | |
31 public: | |
32 explicit ByteVectorGenerator(size_t byte_count); | |
Alexei Svitkine (slow)
2014/01/09 19:23:09
Add an explicit destructor and define it in the C+
Steven Holte
2014/01/09 22:03:01
Done.
| |
33 // Generates a random byte vector where each bit is independently set with | |
Alexei Svitkine (slow)
2014/01/09 19:23:09
Nit: Add an empty line above this.
Steven Holte
2014/01/09 22:03:01
Done.
| |
34 // the given probability. | |
35 ByteVector GetWeightedRandomByteVector(Probability probability); | |
36 | |
37 protected: | |
38 // Generates a random byte from a uniform distribution. | |
39 virtual uint8_t RandByte(); | |
40 | |
41 private: | |
42 // Generates a random vector of bytes from a uniform distribution. | |
43 ByteVector GetRandomByteVector(); | |
Alexei Svitkine (slow)
2014/01/09 19:23:09
Add a line after this.
Steven Holte
2014/01/09 22:03:01
Done.
| |
44 size_t byte_count_; | |
45 }; | |
Alexei Svitkine (slow)
2014/01/09 19:23:09
DISALLOW_COPY_AND_ASSIGN()? Also below.
Steven Holte
2014/01/09 22:03:01
Done.
| |
46 | |
47 // A ByteVectorGenerator that uses a psuedo-random function to generate | |
48 // deterministicly random bits. | |
49 class HmacByteVectorGenerator : public ByteVectorGenerator { | |
50 public: | |
51 HmacByteVectorGenerator(size_t byte_count, const std::string& secret); | |
Alexei Svitkine (slow)
2014/01/09 19:23:09
Document params.
Steven Holte
2014/01/09 22:03:01
Done.
| |
52 | |
53 protected: | |
54 virtual uint8_t RandByte(); | |
Alexei Svitkine (slow)
2014/01/09 19:23:09
OVERRIDE
Steven Holte
2014/01/09 22:03:01
Done.
| |
55 | |
56 private: | |
57 crypto::HMAC hmac_; | |
58 uint64_t hmac_state_; | |
59 }; | |
60 | |
61 } // namespace rappor | |
62 | |
63 #endif // COMPONENTS_RAPPOR_BYTE_VECTOR_UTILS_H_ | |
OLD | NEW |