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/*
* Blake2b
* (C) 2016 cynecx
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#ifndef BOTAN_BLAKE2B_H__
#define BOTAN_BLAKE2B_H__
#include <botan/hash.h>
#include <string>
#include <memory>
namespace Botan {
enum blake2b_constant {
BLAKE2B_BLOCKBYTES = 128,
BLAKE2B_OUTBYTES = 64,
BLAKE2B_IVU64COUNT = 8
};
/**
* BLAKE2B
*/
class BOTAN_DLL Blake2b final : public HashFunction
{
public:
/**
* @param output_bits the output size of Blake2b in bits
*/
explicit Blake2b(size_t output_bits = 512);
size_t hash_block_size() const override { return BLAKE2B_BLOCKBYTES; }
size_t output_length() const override { return m_output_bits / 8; }
static Blake2b* make(const Spec& spec);
HashFunction* clone() const override;
std::string name() const override;
void clear() override;
private:
void add_data(const byte input[], size_t length) override;
void final_result(byte out[]) override;
inline void state_init();
inline void increment_counter(const u64bit inc);
void compress(bool lastblock = false);
size_t m_output_bits;
secure_vector<byte> m_buffer;
size_t m_buflen;
secure_vector<u64bit> m_H;
u64bit m_T[2];
u64bit m_F[2];
};
}
#endif
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