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/*
* Randpool
* (C) 1999-2008 Jack Lloyd
*
* Distributed under the terms of the Botan license
*/
#ifndef BOTAN_RANDPOOL_H__
#define BOTAN_RANDPOOL_H__
#include <botan/rng.h>
#include <botan/block_cipher.h>
#include <botan/mac.h>
#include <vector>
namespace Botan {
/**
* Randpool
*/
class BOTAN_DLL Randpool : public RandomNumberGenerator
{
public:
void randomize(byte[], u32bit);
bool is_seeded() const { return seeded; }
void clear();
std::string name() const;
void reseed(u32bit bits_to_collect);
void add_entropy_source(EntropySource* es);
void add_entropy(const byte input[], u32bit length);
Randpool(BlockCipher* cipher, MessageAuthenticationCode* mac,
u32bit pool_blocks = 32,
u32bit iterations_before_reseed = 128);
~Randpool();
private:
void update_buffer();
void mix_pool();
u32bit ITERATIONS_BEFORE_RESEED, POOL_BLOCKS;
BlockCipher* cipher;
MessageAuthenticationCode* mac;
std::vector<EntropySource*> entropy_sources;
SecureVector<byte> pool, buffer, counter;
bool seeded;
};
}
#endif
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