Source: ../../rtrmgr/randomness.hh

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// -*- c-basic-offset: 4; tab-width: 8; indent-tabs-mode: t -*-

// Copyright (c) 2001-2008 XORP, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the "Software")
// to deal in the Software without restriction, subject to the conditions
// listed in the XORP LICENSE file. These conditions include: you must
// preserve this copyright notice, and you cannot mention the copyright
// holders in advertising related to the Software without their permission.
// The Software is provided WITHOUT ANY WARRANTY, EXPRESS OR IMPLIED. This
// notice is a summary of the XORP LICENSE file; the license in that file is
// legally binding.

// $XORP: xorp/rtrmgr/randomness.hh,v 1.11 2008/07/23 05:11:43 pavlin Exp $

#ifndef __RTRMGR_RANDOMNESS_HH__
#define __RTRMGR_RANDOMNESS_HH__

class RandomGen {
public:
    RandomGen();
    ~RandomGen();

    void get_random_bytes(size_t len, uint8_t* buf);

private:
    bool read_file(const string& filename);
    bool read_fd(FILE* file);
    void add_buf_to_randomness(uint8_t* buf, size_t len);

    static const size_t RAND_POOL_SIZE = 65536;

    bool	_random_exists;
    bool	_urandom_exists;
    uint8_t*	_random_data;
    uint32_t	_counter;
};

#endif // __RTRMGR_RANDOMNESS_HH__