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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 final : public HashFunction
{
public:
/**
* @param output_bits the output size of Skein in bits
* @param personalization is a string that will parameterize the
* hash output
*/
Skein_512(size_t output_bits = 512,
const std::string& personalization = "");
size_t hash_block_size() const override { return 64; }
size_t output_length() const override { return m_output_bits / 8; }
HashFunction* clone() const override;
std::unique_ptr<HashFunction> copy_state() const override;
std::string name() const override;
void clear() override;
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 uint8_t input[], size_t length) override;
void final_result(uint8_t out[]) override;
void ubi_512(const uint8_t msg[], size_t msg_len);
void initial_block();
void reset_tweak(type_code type, bool is_final);
std::string m_personalization;
size_t m_output_bits;
std::unique_ptr<Threefish_512> m_threefish;
secure_vector<uint64_t> m_T;
secure_vector<uint8_t> m_buffer;
size_t m_buf_pos;
};
}
#endif
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