net/quic/crypto/quic_random.h

   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:
  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_