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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[], size_t);
bool is_seeded() const { return seeded; }
void clear();
std::string name() const;
void reseed(size_t bits_to_collect);
void add_entropy_source(EntropySource* es);
void add_entropy(const byte input[], size_t length);
/**
* @param cipher a block cipher to use
* @param mac a message authentication code to use
* @param pool_blocks how many cipher blocks to use for the pool
* @param iterations_before_reseed how many times we'll use the
* internal state to generate output before reseeding
*/
Randpool(BlockCipher* cipher,
MessageAuthenticationCode* mac,
size_t pool_blocks = 32,
size_t iterations_before_reseed = 128);
~Randpool();
private:
void update_buffer();
void mix_pool();
size_t 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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