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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(); } |
| 21 |
| 22 ByteVector RapporMetric::GetReport(const std::string& secret) const { |
| 23 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 const ByteVector fake_ones = |
| 30 hmac_generator.GetWeightedRandomByteVector(parameters()->fake_one_prob); |
| 31 |
| 32 const ByteVector* onebits = ByteVectorMerge(&real_bits, fake_ones, fake_mask); |
| 33 |
| 34 ByteVectorGenerator coinGenerator(real_bits.size()); |
| 35 ByteVector zero_coins = |
| 36 coinGenerator.GetWeightedRandomByteVector(parameters()->zero_coin_prob); |
| 37 const ByteVector one_coins = |
| 38 coinGenerator.GetWeightedRandomByteVector(parameters()->one_coin_prob); |
| 39 |
| 40 const ByteVector* output = ByteVectorMerge(&zero_coins, one_coins, *onebits); |
| 41 |
| 42 return *output; |
| 43 } |
| 44 |
| 45 } // namespace rappor |
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