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/*
* SHAKE-128 and SHAKE-256 as XOFs
*
* (C) 2016-2023 Jack Lloyd
* 2022-2023 Fabian Albert, Michael Boric, René Meusel - Rohde & Schwarz Cybersecurity
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#ifndef BOTAN_SHAKE_XOF_H_
#define BOTAN_SHAKE_XOF_H_
#include <botan/xof.h>
#include <botan/internal/keccak_perm.h>
#include <vector>
namespace Botan {
/**
* Base class for SHAKE-based XOFs
*/
class SHAKE_XOF : public XOF {
protected:
/**
* Defines a concrete instance of a SHAKE XOF.
*
* @param capacity either 256 or 512
*/
SHAKE_XOF(size_t capacity);
public:
std::string provider() const final { return m_keccak.provider(); }
size_t block_size() const final { return m_keccak.byte_rate(); }
bool accepts_input() const final { return !m_output_generated; }
private:
void add_data(std::span<const uint8_t> input) final;
void generate_bytes(std::span<uint8_t> output) final;
void reset() final;
private:
Keccak_Permutation m_keccak;
bool m_output_generated;
};
/**
* SHAKE-128 as defined in FIPS Pub.202 Section 6.2
*/
class SHAKE_128_XOF final : public SHAKE_XOF {
public:
SHAKE_128_XOF() : SHAKE_XOF(256) {}
std::string name() const final { return "SHAKE-128"; }
std::unique_ptr<XOF> copy_state() const final { return std::make_unique<SHAKE_128_XOF>(*this); }
std::unique_ptr<XOF> new_object() const final { return std::make_unique<SHAKE_128_XOF>(); }
};
/**
* SHAKE-256 as defined in FIPS Pub.202 Section 6.2
*/
class SHAKE_256_XOF final : public SHAKE_XOF {
public:
SHAKE_256_XOF() : SHAKE_XOF(512) {}
std::string name() const final { return "SHAKE-256"; }
std::unique_ptr<XOF> copy_state() const final { return std::make_unique<SHAKE_256_XOF>(*this); }
std::unique_ptr<XOF> new_object() const final { return std::make_unique<SHAKE_256_XOF>(); }
};
} // namespace Botan
#endif