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| 1 // Copyright 2014 The Chromium Authors. All rights reserved. | 1 // Copyright 2014 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
| 4 | 4 |
| 5 #ifndef COMPONENTS_RAPPOR_BYTE_VECTOR_UTILS_H_ | 5 #ifndef COMPONENTS_RAPPOR_BYTE_VECTOR_UTILS_H_ |
| 6 #define COMPONENTS_RAPPOR_BYTE_VECTOR_UTILS_H_ | 6 #define COMPONENTS_RAPPOR_BYTE_VECTOR_UTILS_H_ |
| 7 | 7 |
| 8 #include <vector> | 8 #include <vector> |
| 9 | 9 |
| 10 #include "base/basictypes.h" | 10 #include "base/basictypes.h" |
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| 88 | 88 |
| 89 // Key size required for 128-bit security strength (including nonce). | 89 // Key size required for 128-bit security strength (including nonce). |
| 90 static const size_t kEntropyInputSize; | 90 static const size_t kEntropyInputSize; |
| 91 | 91 |
| 92 protected: | 92 protected: |
| 93 // Generate byte vector generator that streams from the next request instead | 93 // Generate byte vector generator that streams from the next request instead |
| 94 // of the current one. For testing against NIST test vectors only. | 94 // of the current one. For testing against NIST test vectors only. |
| 95 explicit HmacByteVectorGenerator(const HmacByteVectorGenerator& prev_request); | 95 explicit HmacByteVectorGenerator(const HmacByteVectorGenerator& prev_request); |
| 96 | 96 |
| 97 // ByteVector implementation: | 97 // ByteVector implementation: |
| 98 virtual ByteVector GetRandomByteVector() OVERRIDE; | 98 virtual ByteVector GetRandomByteVector() override; |
| 99 | 99 |
| 100 private: | 100 private: |
| 101 // HMAC initalized with the value of "Key" HMAC_DRBG_Initialize. | 101 // HMAC initalized with the value of "Key" HMAC_DRBG_Initialize. |
| 102 crypto::HMAC hmac_; | 102 crypto::HMAC hmac_; |
| 103 | 103 |
| 104 // The "V" value from HMAC_DRBG. | 104 // The "V" value from HMAC_DRBG. |
| 105 ByteVector value_; | 105 ByteVector value_; |
| 106 | 106 |
| 107 // Total number of bytes streamed from the HMAC_DRBG Generate Process. | 107 // Total number of bytes streamed from the HMAC_DRBG Generate Process. |
| 108 size_t generated_bytes_; | 108 size_t generated_bytes_; |
| 109 | 109 |
| 110 DISALLOW_ASSIGN(HmacByteVectorGenerator); | 110 DISALLOW_ASSIGN(HmacByteVectorGenerator); |
| 111 }; | 111 }; |
| 112 | 112 |
| 113 } // namespace rappor | 113 } // namespace rappor |
| 114 | 114 |
| 115 #endif // COMPONENTS_RAPPOR_BYTE_VECTOR_UTILS_H_ | 115 #endif // COMPONENTS_RAPPOR_BYTE_VECTOR_UTILS_H_ |
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