org.clazzes.optional.sec
Interface Mac

All Known Implementing Classes:
HMac

public interface Mac

A message authentication code.


Method Summary
 int doFinal(byte[] out, int outOff)
          Compute the final stage of the MAC writing the output to the out parameter.
 java.lang.String getAlgorithmName()
          Return the name of the algorithm the MAC implements.
 int getMacSize()
          Return the block size for this MAC (in bytes).
 void init(byte[] key)
          Initialise the MAC.
 void reset()
          Reset the MAC.
 void update(byte in)
          add a single byte to the mac for processing.
 void update(byte[] in, int inOff, int len)
           
 

Method Detail

init

void init(byte[] key)
Initialise the MAC.

Parameters:
key - the key required by the MAC.

getAlgorithmName

java.lang.String getAlgorithmName()
Return the name of the algorithm the MAC implements.

Returns:
the name of the algorithm the MAC implements.

getMacSize

int getMacSize()
Return the block size for this MAC (in bytes).

Returns:
the block size for this MAC in bytes.

update

void update(byte in)
add a single byte to the mac for processing.

Parameters:
in - the byte to be processed.

update

void update(byte[] in,
            int inOff,
            int len)
Parameters:
in - the array containing the input.
inOff - the index in the array the data begins at.
len - the length of the input starting at inOff.

doFinal

int doFinal(byte[] out,
            int outOff)
Compute the final stage of the MAC writing the output to the out parameter.

doFinal leaves the MAC in the same state it was after the last init.

Parameters:
out - the array the MAC is to be output to.
outOff - the offset into the out buffer the output is to start at.

reset

void reset()
Reset the MAC. At the end of resetting the MAC should be in the in the same state it was after the last init (if there was one).



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