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/*
* The Skein-512 hash function
* (C) 2009,2014 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#ifndef BOTAN_SKEIN_512_H__
#define BOTAN_SKEIN_512_H__
#include <botan/hash.h>
#include <botan/threefish.h>
#include <string>
#include <memory>
namespace Botan {
/**
* Skein-512, a SHA-3 candidate
*/
class BOTAN_DLL Skein_512 : public HashFunction
{
public:
/**
* @param output_bits the output size of Skein in bits
* @param personalization is a string that will paramaterize the
* hash output
*/
Skein_512(size_t output_bits = 512,
const std::string& personalization = "");
size_t hash_block_size() const { return 64; }
size_t output_length() const { return output_bits / 8; }
HashFunction* clone() const;
std::string name() const;
void clear();
private:
enum type_code {
SKEIN_KEY = 0,
SKEIN_CONFIG = 4,
SKEIN_PERSONALIZATION = 8,
SKEIN_PUBLIC_KEY = 12,
SKEIN_KEY_IDENTIFIER = 16,
SKEIN_NONCE = 20,
SKEIN_MSG = 48,
SKEIN_OUTPUT = 63
};
void add_data(const byte input[], size_t length);
void final_result(byte out[]);
void ubi_512(const byte msg[], size_t msg_len);
void initial_block();
void reset_tweak(type_code type, bool final);
std::string personalization;
size_t output_bits;
std::unique_ptr<Threefish_512> m_threefish;
secure_vector<u64bit> T;
secure_vector<byte> buffer;
size_t buf_pos;
};
}
#endif
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