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/*
* BLAKE2s
* (C) 2023 Richard Huveneers
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#ifndef BOTAN_BLAKE2S_H_
#define BOTAN_BLAKE2S_H_
#include <botan/hash.h>
namespace Botan {
/**
* BLAKE2s
*/
class BLAKE2s final : public HashFunction {
public:
explicit BLAKE2s(size_t output_bits = 256);
~BLAKE2s() override;
std::string name() const override;
size_t output_length() const override { return m_outlen; }
size_t hash_block_size() const override { return 64; }
std::unique_ptr<HashFunction> copy_state() const override;
std::unique_ptr<HashFunction> new_object() const override { return std::make_unique<BLAKE2s>(m_outlen << 3); }
void clear() override;
private:
void add_data(std::span<const uint8_t>) override;
void final_result(std::span<uint8_t>) override;
void state_init(size_t outlen, const uint8_t* key, size_t keylen);
void compress(bool last);
uint8_t m_b[64]; // input buffer
uint32_t m_h[8]; // chained state
uint32_t m_t[2]; // total number of bytes
uint8_t m_c; // pointer for b[]
size_t m_outlen; // digest size
};
} // namespace Botan
#endif