RijndaelCBCMAC Class Reference

Class to compute CBC-MAC using the AES/Rijndael cipher. More...

#include <RijndaelCBCMAC.h>

Collaboration diagram for RijndaelCBCMAC:

Public Types
enum	{ BLOCK_SIZE = 16 }
typedef uint8_t	block_t[BLOCK_SIZE]
	The cipher block data type.

Public Member Functions
	RijndaelCBCMAC ()
	Default constructor. More...
	RijndaelCBCMAC (const AESKey< 128 > &key, const uint8_t *iv=0)
	Constructor. More...
void	update (const uint8_t *data, unsigned length)
	Process data. More...
void	finalize ()
	Signal that all data has been processed. More...
const block_t &	getMAC () const
	Returns a reference to the current MAC value.
RijndaelCBCMAC &	operator= (const RijndaelCBCMAC &other)
	Assignment operator.

Protected Member Functions
void	updateOneBlock (const uint8_t *data)

Protected Attributes
AESKey< 128 >	m_key
	128-bit key to use for the CBC-MAC.
block_t	m_mac
	Current message authentication code value.

Detailed Description

Class to compute CBC-MAC using the AES/Rijndael cipher.

Currently only supports 128-bit keys and block sizes.

Member Enumeration Documentation

anonymous enum

Enumerator
BLOCK_SIZE	Number of bytes in one cipher block.

Constructor & Destructor Documentation

RijndaelCBCMAC::RijndaelCBCMAC ( )

inline

Default constructor.

The key and IV are both set to zero.

RijndaelCBCMAC::RijndaelCBCMAC	(	const AESKey< 128 > &	key,
		const uint8_t *	iv = 0
	)

Constructor.

Parameters

key	The key to use as the CBC-MAC secret.
iv	Initialization vector. Defaults to zero if not provided.

Member Function Documentation

void RijndaelCBCMAC::finalize

(

)

Signal that all data has been processed.

It appears that some forms of CBC-MAC encrypt the final output block again in order to protect against a plaintext attack. This method is a placeholder for such an operation, but it currently does nothing.

void RijndaelCBCMAC::update	(	const uint8_t *	data,
		unsigned	length
	)

Process data.

Parameters

data	Pointer to data to process.
length	Number of bytes to process. Must be evenly divisible by BLOCK_SIZE.

void RijndaelCBCMAC::updateOneBlock ( const uint8_t *  data )

protected

On entry the current value of m_mac becomes the initialization vector for the CBC encryption of this block. The output of the encryption then becomes the new MAC, which is stored in m_mac.

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The documentation for this class was generated from the following files:

• RijndaelCBCMAC.h
• RijndaelCBCMAC.cpp