cmac.h

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/*
* CMAC
* (C) 1999-2007,2014 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
 
#ifndef BOTAN_CMAC_H_
#define BOTAN_CMAC_H_
 
#include <botan/block_cipher.h>
#include <botan/mac.h>
 
namespace Botan {
 
/**
* CMAC, also known as OMAC1
*/
class CMAC final : public MessageAuthenticationCode {
   public:
      std::string name() const override;
 
      size_t output_length() const override { return m_block_size; }
 
      std::unique_ptr<MessageAuthenticationCode> new_object() const override;
 
      void clear() override;
      bool has_keying_material() const override;
 
      Key_Length_Specification key_spec() const override { return m_cipher->key_spec(); }
 
      /**
      * @param cipher the block cipher to use
      */
      explicit CMAC(std::unique_ptr<BlockCipher> cipher);
 
   private:
      void add_data(std::span<const uint8_t> input) override;
      void final_result(std::span<uint8_t> output) override;
      void start_msg(std::span<const uint8_t> nonce) override;
      void key_schedule(std::span<const uint8_t> key) override;
 
      std::unique_ptr<BlockCipher> m_cipher;
      secure_vector<uint8_t> m_buffer, m_state, m_B, m_P;
      const size_t m_block_size;
      size_t m_position;
};
 
}  // namespace Botan
 
#endif