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1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2011 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 BASE_RAND_UTIL_H_ | 5 #ifndef BASE_RAND_UTIL_H_ |
6 #define BASE_RAND_UTIL_H_ | 6 #define BASE_RAND_UTIL_H_ |
7 #pragma once | 7 #pragma once |
8 | 8 |
9 #include <string> | 9 #include <string> |
10 | 10 |
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22 // Returns a random number in range [0, max). Thread-safe. | 22 // Returns a random number in range [0, max). Thread-safe. |
23 // | 23 // |
24 // Note that this can be used as an adapter for std::random_shuffle(): | 24 // Note that this can be used as an adapter for std::random_shuffle(): |
25 // Given a pre-populated |std::vector<int> myvector|, shuffle it as | 25 // Given a pre-populated |std::vector<int> myvector|, shuffle it as |
26 // std::random_shuffle(myvector.begin(), myvector.end(), base::RandGenerator); | 26 // std::random_shuffle(myvector.begin(), myvector.end(), base::RandGenerator); |
27 BASE_API uint64 RandGenerator(uint64 max); | 27 BASE_API uint64 RandGenerator(uint64 max); |
28 | 28 |
29 // Returns a random double in range [0, 1). Thread-safe. | 29 // Returns a random double in range [0, 1). Thread-safe. |
30 BASE_API double RandDouble(); | 30 BASE_API double RandDouble(); |
31 | 31 |
32 // Returns a random string of the specified length. | 32 // Fills |output_length| bytes of |output| with cryptographically strong random |
| 33 // data. |
| 34 BASE_API void RandBytes(void* output, size_t output_length); |
| 35 |
| 36 // Fills a string of length |length| with with cryptographically strong random |
| 37 // data and returns it. |
| 38 // |
| 39 // Not that this is a variation of |RandBytes| with a different return type. |
33 BASE_API std::string RandBytesAsString(size_t length); | 40 BASE_API std::string RandBytesAsString(size_t length); |
34 | 41 |
35 } // namespace base | 42 } // namespace base |
36 | 43 |
37 #endif // BASE_RAND_UTIL_H_ | 44 #endif // BASE_RAND_UTIL_H_ |
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