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
13namespace net {
14
15// The interface for a random number generator.
16class 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_
39