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/**
* EntropySource Header File
* (C) 2008-2009 Jack Lloyd
*/
#ifndef BOTAN_ENTROPY_SOURCE_BASE_H__
#define BOTAN_ENTROPY_SOURCE_BASE_H__
#include <botan/buf_comp.h>
#include <string>
#include <utility>
namespace Botan {
/**
* Class used to accumulate the poll results of EntropySources
*/
class Entropy_Accumulator
{
public:
Entropy_Accumulator(u32bit entropy_goal)
{ reset_goal(entropy_goal); }
const MemoryRegion<byte>& get_entropy_buffer() const
{ return entropy_buf; }
MemoryRegion<byte>& get_io_buffer(u32bit size);
void reset_goal(u32bit entropy_goal);
u32bit bits_collected() const { return collected_bits; }
bool polling_goal_achieved() const;
u32bit desired_remaining_bits() const;
void add(const void* bytes, u32bit length, double bits_per_byte);
template<typename T>
void add(const T& v, double bits_per_byte)
{
add(&v, sizeof(T), bits_per_byte);
}
private:
SecureVector<byte> io_buffer, entropy_buf;
u32bit collected_bits, goal_bits;
};
/**
* Abstract interface to a source of (hopefully unpredictable) system entropy
*/
class BOTAN_DLL EntropySource
{
public:
virtual std::string name() const = 0;
virtual void poll(Entropy_Accumulator& accum) = 0;
virtual ~EntropySource() {}
};
}
#endif
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