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/*
* KMAC
* (C) 2023 Jack Lloyd
* (C) 2023 Falko Strenzke
* (C) 2023 René Meusel - Rohde & Schwarz Cybersecurity
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#ifndef BOTAN_KMAC_H_
#define BOTAN_KMAC_H_
#include <botan/mac.h>
namespace Botan {
class cSHAKE_XOF;
class KMAC : public MessageAuthenticationCode {
protected:
KMAC(std::unique_ptr<cSHAKE_XOF> cshake, size_t output_bit_length);
public:
virtual ~KMAC();
KMAC(const KMAC&) = delete;
KMAC& operator=(const KMAC&) = delete;
void clear() final;
size_t output_length() const final;
Key_Length_Specification key_spec() const final;
bool has_keying_material() const final;
std::string provider() const final;
private:
void start_msg(std::span<const uint8_t> nonce) final;
void add_data(std::span<const uint8_t>) final;
void final_result(std::span<uint8_t>) final;
void key_schedule(std::span<const uint8_t>) final;
private:
size_t m_output_bit_length;
secure_vector<uint8_t> m_encoded_key;
bool m_message_started;
std::unique_ptr<cSHAKE_XOF> m_cshake;
};
/**
* KMAC-128 as specified in NIST SP.800-185 Section 4
*/
class KMAC128 final : public KMAC {
public:
KMAC128(size_t output_bit_length);
std::string name() const override;
std::unique_ptr<MessageAuthenticationCode> new_object() const override;
};
/**
* KMAC-256 as specified in NIST SP.800-185 Section 4
*/
class KMAC256 final : public KMAC {
public:
KMAC256(size_t output_bit_length);
std::string name() const override;
std::unique_ptr<MessageAuthenticationCode> new_object() const override;
};
} // namespace Botan
#endif