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/*
* Keccak
* (C) 2010 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#ifndef BOTAN_KECCAK_H__
#define BOTAN_KECCAK_H__
#include <botan/hash.h>
#include <botan/secmem.h>
#include <string>
namespace Botan {
/**
* Keccak[1600], a SHA-3 candidate
*/
class BOTAN_DLL Keccak_1600 : public HashFunction
{
public:
/**
* @param output_bits the size of the hash output; must be one of
* 224, 256, 384, or 512
*/
Keccak_1600(size_t output_bits = 512);
size_t hash_block_size() const { return bitrate / 8; }
size_t output_length() const { return output_bits / 8; }
HashFunction* clone() const;
std::string name() const;
void clear();
private:
void add_data(const byte input[], size_t length);
void final_result(byte out[]);
size_t output_bits, bitrate;
secure_vector<u64bit> S;
size_t S_pos;
};
}
#endif
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