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