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org.bouncycastle.crypto.internal.macs

public Class TruncatingMac

extends Object
implements Mac
Class Inheritance
All Implemented Interfaces
org.bouncycastle.crypto.internal.Mac
Imports
org.bouncycastle.crypto.internal.CipherParameters, .DataLengthException, .Mac

Field Summary

Modifier and TypeField and Description
private final Mac
mac

private final int
macSizeInBits

Constructor Summary

AccessConstructor and Description
public
TruncatingMac(Mac mac, int macSizeInBits)

Method Summary

Modifier and TypeMethod and Description
public int
doFinal(byte[]
the array the MAC is to be output to.
out, int
the offset into the out buffer the output is to start at.
outOff)

Implements org.bouncycastle.crypto.internal.Mac.doFinal.

Compute the final stage of the MAC writing the output to the out parameter.
public String
getAlgorithmName()

Implements org.bouncycastle.crypto.internal.Mac.getAlgorithmName.

Return the name of the algorithm the MAC implements.
public int
getMacSize()

Implements org.bouncycastle.crypto.internal.Mac.getMacSize.

Return the block size for this MAC (in bytes).
public void
init(CipherParameters
the key and other data required by the MAC.
params)

Implements org.bouncycastle.crypto.internal.Mac.init.

Initialise the MAC.
public void
reset()

Implements org.bouncycastle.crypto.internal.Mac.reset.

Reset the MAC.
public void
update(byte
the byte to be processed.
in)

Implements org.bouncycastle.crypto.internal.Mac.update.

add a single byte to the mac for processing.
public void
update(byte[]
the array containing the input.
in, int
the index in the array the data begins at.
inOff, int
the length of the input starting at inOff.
len)

Implements org.bouncycastle.crypto.internal.Mac.update.

Inherited from java.lang.Object:
cloneequalsfinalizegetClasshashCodenotifynotifyAlltoStringwaitwaitwait

Field Detail

macback to summary
private final Mac mac
macSizeInBitsback to summary
private final int macSizeInBits

Constructor Detail

TruncatingMacback to summary
public TruncatingMac(Mac mac, int macSizeInBits)

Method Detail

doFinalback to summary
public int doFinal(byte[] out, int outOff) throws DataLengthException, IllegalStateException

Implements org.bouncycastle.crypto.internal.Mac.doFinal.

Doc from org.bouncycastle.crypto.internal.Mac.doFinal.

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:byte[]

the array the MAC is to be output to.

outOff:int

the offset into the out buffer the output is to start at.

Exceptions
DataLengthException:
if there isn't enough space in out.
IllegalStateException:
if the MAC is not initialised.
getAlgorithmNameback to summary
public String getAlgorithmName()

Implements org.bouncycastle.crypto.internal.Mac.getAlgorithmName.

Doc from org.bouncycastle.crypto.internal.Mac.getAlgorithmName.

Return the name of the algorithm the MAC implements.

Returns:String

the name of the algorithm the MAC implements.

getMacSizeback to summary
public int getMacSize()

Implements org.bouncycastle.crypto.internal.Mac.getMacSize.

Doc from org.bouncycastle.crypto.internal.Mac.getMacSize.

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

Returns:int

the block size for this MAC in bytes.

initback to summary
public void init(CipherParameters params) throws IllegalArgumentException

Implements org.bouncycastle.crypto.internal.Mac.init.

Doc from org.bouncycastle.crypto.internal.Mac.init.

Initialise the MAC.

Parameters
params:CipherParameters

the key and other data required by the MAC.

Exceptions
IllegalArgumentException:
if the params argument is inappropriate.
resetback to summary
public void reset()

Implements org.bouncycastle.crypto.internal.Mac.reset.

Doc from org.bouncycastle.crypto.internal.Mac.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).

updateback to summary
public void update(byte in) throws IllegalStateException

Implements org.bouncycastle.crypto.internal.Mac.update.

Doc from org.bouncycastle.crypto.internal.Mac.update.

add a single byte to the mac for processing.

Parameters
in:byte

the byte to be processed.

Exceptions
IllegalStateException:
if the MAC is not initialised.
updateback to summary
public void update(byte[] in, int inOff, int len) throws DataLengthException, IllegalStateException

Implements org.bouncycastle.crypto.internal.Mac.update.

Parameters
in:byte[]

Doc from org.bouncycastle.crypto.internal.Mac.update.

the array containing the input.

inOff:int

Doc from org.bouncycastle.crypto.internal.Mac.update.

the index in the array the data begins at.

len:int

Doc from org.bouncycastle.crypto.internal.Mac.update.

the length of the input starting at inOff.

Exceptions
DataLengthException:

Doc from org.bouncycastle.crypto.internal.Mac.update.

if there isn't enough data in in.

IllegalStateException:

Doc from org.bouncycastle.crypto.internal.Mac.update.

if the MAC is not initialised.