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/*
* CMAC
* (C) 1999-2007 Jack Lloyd
*
* Distributed under the terms of the Botan license
*/
#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 : public MessageAuthenticationCode
{
public:
std::string name() const;
size_t output_length() const { return e->block_size(); }
MessageAuthenticationCode* clone() const;
void clear();
Key_Length_Specification key_spec() const
{
return e->key_spec();
}
/**
* CMAC's polynomial doubling operation
* @param in the input
* @param polynomial the byte value of the polynomial
*/
static SecureVector<byte> poly_double(const MemoryRegion<byte>& in,
byte polynomial);
/**
* @param cipher the underlying block cipher to use
*/
CMAC(BlockCipher* cipher);
~CMAC();
private:
void add_data(const byte[], size_t);
void final_result(byte[]);
void key_schedule(const byte[], size_t);
BlockCipher* e;
SecureVector<byte> buffer, state, B, P;
size_t position;
byte polynomial;
};
}
#endif
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