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1 // Copyright (c) 2012 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 #include "components/rappor/rappor_metric.h" | |
6 | |
7 namespace rappor { | |
8 | |
9 RapporMetric::RapporMetric(const RapporParameters& parameters) | |
10 : parameters_(parameters), | |
11 bloom_(parameters.bloom_filter_size_bytes, | |
12 parameters.bloom_filter_hash_count) {} | |
13 | |
14 void RapporMetric::AddSamples(const std::vector<std::string>& strings) { | |
15 bloom_.AddStrings(strings); | |
16 } | |
17 | |
18 void RapporMetric::AddSample(const std::string& str) { bloom_.AddString(str); } | |
19 | |
20 const ByteVector& RapporMetric::GetBytes() const { return bloom_.bytes(); } | |
Ilya Sherman
2014/01/10 11:00:32
nit: It's fine to name this method "bytes()" and i
Steven Holte
2014/01/14 00:47:54
Done.
| |
21 | |
22 ByteVector RapporMetric::GetReport(const std::string& secret) const { | |
Ilya Sherman
2014/01/10 11:00:32
It would be very useful to include comments in thi
Steven Holte
2014/01/14 00:47:54
Done.
| |
23 const ByteVector real_bits(GetBytes()); | |
24 | |
25 HmacByteVectorGenerator hmac_generator(real_bits.size(), | |
26 secret + parameters()->rappor_name); | |
27 const ByteVector fake_mask = | |
28 hmac_generator.GetWeightedRandomByteVector(parameters()->fake_prob); | |
29 ByteVector fake_ones = | |
30 hmac_generator.GetWeightedRandomByteVector(parameters()->fake_one_prob); | |
31 | |
32 const ByteVector* onebits = ByteVectorMerge(fake_mask, real_bits, &fake_ones); | |
33 | |
34 ByteVectorGenerator coinGenerator(real_bits.size()); | |
Ilya Sherman
2014/01/10 11:00:32
nit: coinGenerator -> coin_generator
Steven Holte
2014/01/14 00:47:54
Done.
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35 const ByteVector zero_coins = | |
36 coinGenerator.GetWeightedRandomByteVector(parameters()->zero_coin_prob); | |
37 ByteVector one_coins = | |
38 coinGenerator.GetWeightedRandomByteVector(parameters()->one_coin_prob); | |
39 | |
40 const ByteVector* output = ByteVectorMerge(*onebits, zero_coins, &one_coins); | |
41 | |
42 return *output; | |
43 } | |
44 | |
45 } // namespace rappor | |
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