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/*
* File: RijndaelCBCMAC.h
*
* Copyright (c) Freescale Semiconductor, Inc. All rights reserved.
* See included license file for license details.
*/
#if !defined(_RijndaelCBCMAC_h_)
#define _RijndaelCBCMAC_h_
#include "AESKey.h"
#include <string.h>
/*!
* \brief Class to compute CBC-MAC using the AES/Rijndael cipher.
*
* Currently only supports 128-bit keys and block sizes.
*/
class RijndaelCBCMAC
{
public:
enum
{
BLOCK_SIZE = 16 //!< Number of bytes in one cipher block.
};
//! The cipher block data type.
typedef uint8_t block_t[BLOCK_SIZE];
public:
//! \brief Default constructor.
//!
//! The key and IV are both set to zero.
RijndaelCBCMAC() {}
//! \brief Constructor.
RijndaelCBCMAC(const AESKey<128> & key, const uint8_t * iv=0);
//! \brief Process data.
void update(const uint8_t * data, unsigned length);
//! \brief Signal that all data has been processed.
void finalize();
//! \brief Returns a reference to the current MAC value.
const block_t & getMAC() const { return m_mac; }
//! \brief Assignment operator.
RijndaelCBCMAC & operator = (const RijndaelCBCMAC & other)
{
m_key = other.m_key;
memcpy(m_mac, other.m_mac, sizeof(m_mac));
return *this;
}
protected:
AESKey<128> m_key; //!< 128-bit key to use for the CBC-MAC.
block_t m_mac; //!< Current message authentication code value.
void updateOneBlock(const uint8_t * data);
};
#endif // _RijndaelCBCMAC_h_
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