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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/mac.h>
#include <botan/block_cipher.h>
namespace Botan {
/**
* CMAC, also known as OMAC1
*/
class BOTAN_DLL CMAC final : public MessageAuthenticationCode
{
public:
std::string name() const override;
size_t output_length() const override { return m_cipher->block_size(); }
MessageAuthenticationCode* clone() const override;
void clear() override;
Key_Length_Specification key_spec() const override
{
return m_cipher->key_spec();
}
/**
* CMAC's polynomial doubling operation
* @param in the input
* @param polynomial the byte value of the polynomial
*/
static secure_vector<byte> poly_double(const secure_vector<byte>& in);
/**
* @param cipher the block cipher to use
*/
explicit CMAC(BlockCipher* cipher);
static CMAC* make(const Spec& spec);
CMAC(const CMAC&) = delete;
CMAC& operator=(const CMAC&) = delete;
private:
void add_data(const byte[], size_t) override;
void final_result(byte[]) override;
void key_schedule(const byte[], size_t) override;
std::unique_ptr<BlockCipher> m_cipher;
secure_vector<byte> m_buffer, m_state, m_B, m_P;
size_t m_position;
};
}
#endif
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