1 /* 2 * Copyright 2004 The WebRTC Project Authors. All rights reserved. 3 * 4 * Use of this source code is governed by a BSD-style license 5 * that can be found in the LICENSE file in the root of the source 6 * tree. An additional intellectual property rights grant can be found 7 * in the file PATENTS. All contributing project authors may 8 * be found in the AUTHORS file in the root of the source tree. 9 */ 10 11 #ifndef WEBRTC_BASE_HELPERS_H_ 12 #define WEBRTC_BASE_HELPERS_H_ 13 14 #include <string> 15 #include "webrtc/base/basictypes.h" 16 17 namespace rtc { 18 19 // For testing, we can return predictable data. 20 void SetRandomTestMode(bool test); 21 22 // Initializes the RNG, and seeds it with the specified entropy. 23 bool InitRandom(int seed); 24 bool InitRandom(const char* seed, size_t len); 25 26 // Generates a (cryptographically) random string of the given length. 27 // We generate base64 values so that they will be printable. 28 // WARNING: could silently fail. Use the version below instead. 29 std::string CreateRandomString(size_t length); 30 31 // Generates a (cryptographically) random string of the given length. 32 // We generate base64 values so that they will be printable. 33 // Return false if the random number generator failed. 34 bool CreateRandomString(size_t length, std::string* str); 35 36 // Generates a (cryptographically) random string of the given length, 37 // with characters from the given table. Return false if the random 38 // number generator failed. 39 bool CreateRandomString(size_t length, const std::string& table, 40 std::string* str); 41 42 // Generates a (cryptographically) random UUID version 4 string. 43 std::string CreateRandomUuid(); 44 45 // Generates a random id. 46 uint32_t CreateRandomId(); 47 48 // Generates a 64 bit random id. 49 uint64_t CreateRandomId64(); 50 51 // Generates a random id > 0. 52 uint32_t CreateRandomNonZeroId(); 53 54 // Generates a random double between 0.0 (inclusive) and 1.0 (exclusive). 55 double CreateRandomDouble(); 56 57 } // namespace rtc 58 59 #endif // WEBRTC_BASE_HELPERS_H_ 60
