org.bouncycastle.crypto.macs

Class VMPCMac

Implemented Interfaces:
Mac

public class VMPCMac
extends java.lang.Object
implements Mac

Method Summary

int
doFinal(byte[] out, int outOff)
Compute the final statge of the MAC writing the output to the out parameter.
String
getAlgorithmName()
Return the name of the algorithm the MAC implements.
int
getMacSize()
Return the block size for this MAC (in bytes).
void
init(CipherParameters params)
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 Details

doFinal

public int doFinal(byte[] out,
                   int outOff)
            throws DataLengthException,
                   IllegalStateException
Compute the final statge of the MAC writing the output to the out parameter.

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

Specified by:
doFinal in interface Mac
Parameters:
out - the array the MAC is to be output to.
outOff - the offset into the out buffer the output is to start at.
Throws:
DataLengthException - if there isn't enough space in out.

getAlgorithmName

public String getAlgorithmName()
Return the name of the algorithm the MAC implements.
Specified by:
getAlgorithmName in interface Mac
Returns:
the name of the algorithm the MAC implements.

getMacSize

public int getMacSize()
Return the block size for this MAC (in bytes).
Specified by:
getMacSize in interface Mac
Returns:
the block size for this MAC in bytes.

init

public void init(CipherParameters params)
            throws IllegalArgumentException
Initialise the MAC.
Specified by:
init in interface Mac
Parameters:
params - the key and other data required by the MAC.

reset

public 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).
Specified by:
reset in interface Mac

update

public void update(byte in)
            throws IllegalStateException
add a single byte to the mac for processing.
Specified by:
update in interface Mac
Parameters:
in - the byte to be processed.

update

public void update(byte[] in,
                   int inOff,
                   int len)
            throws DataLengthException,
                   IllegalStateException
Specified by:
update in interface Mac
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.
Throws:
DataLengthException - if there isn't enough data in in.