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 #ifndef NET_QUIC_CRYPTO_QUIC_RANDOM_H_ 6 #define NET_QUIC_CRYPTO_QUIC_RANDOM_H_ 7 8 #include <stddef.h> 9 10 #include "base/basictypes.h" 11 #include "net/base/net_export.h" 12 13 namespace net { 14 15 // The interface for a random number generator. 16 class NET_EXPORT_PRIVATE QuicRandom { 17 public: ~QuicRandom()18 virtual ~QuicRandom() {} 19 20 // Returns the default random number generator, which is cryptographically 21 // secure and thread-safe. 22 static QuicRandom* GetInstance(); 23 24 // Generates |len| random bytes in the |data| buffer. 25 virtual void RandBytes(void* data, size_t len) = 0; 26 27 // Returns a random number in the range [0, kuint64max]. 28 virtual uint64 RandUint64() = 0; 29 30 // Reseeds the random number generator with additional entropy input. 31 // NOTE: the constructor of a QuicRandom object is responsible for seeding 32 // itself with enough entropy input. 33 virtual void Reseed(const void* additional_entropy, size_t entropy_len) = 0; 34 }; 35 36 } // namespace net 37 38 #endif // NET_QUIC_CRYPTO_QUIC_RANDOM_H_ 39