org.bouncycastle.crypto.digests
Class TigerDigest

java.lang.Object
  org.bouncycastle.crypto.digests.TigerDigest

All Implemented Interfaces:

Digest, ExtendedDigest

public class TigerDigest
extends java.lang.Object
implements ExtendedDigest

implementation of Tiger based on: http://www.cs.technion.ac.il/~biham/Reports/Tiger

Field Summary

private long	a
private long	b
private int	bOff
private byte[]	buf
private static int	BYTE_LENGTH
private long	byteCount
private long	c
private static int	DIGEST_LENGTH
private static long[]	t1
private static long[]	t2
private static long[]	t3
private static long[]	t4
private long[]	x
private int	xOff

Constructor Summary

TigerDigest()
Standard constructor

TigerDigest(TigerDigest t)
Copy constructor.

Method Summary

int	doFinal(byte[] out, int outOff) close the digest, producing the final digest value.
private void	finish()
java.lang.String	getAlgorithmName() return the algorithm name
int	getByteLength() Return the size in bytes of the internal buffer the digest applies it's compression function to.
int	getDigestSize() return the size, in bytes, of the digest produced by this message digest.
private void	keySchedule()
private void	processBlock()
private void	processLength(long bitLength)
private void	processWord(byte[] b, int off)
void	reset() reset the chaining variables
private void	roundABC(long x, long mul)
private void	roundBCA(long x, long mul)
private void	roundCAB(long x, long mul)
void	unpackWord(long r, byte[] out, int outOff)
void	update(byte in) update the message digest with a single byte.
void	update(byte[] in, int inOff, int len) update the message digest with a block of bytes.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

BYTE_LENGTH

private static final int BYTE_LENGTH

See Also:

Constant Field Values

t1

private static final long[] t1

t2

private static final long[] t2

t3

private static final long[] t3

t4

private static final long[] t4

DIGEST_LENGTH

private static final int DIGEST_LENGTH

See Also:

Constant Field Values

a

private long a

b

private long b

c

private long c

byteCount

private long byteCount

buf

private byte[] buf

bOff

private int bOff

x

private long[] x

xOff

private int xOff

Constructor Detail

TigerDigest

public TigerDigest()

Standard constructor

TigerDigest

public TigerDigest(TigerDigest t)

Copy constructor. This will copy the state of the provided message digest.

Method Detail

getAlgorithmName

public java.lang.String getAlgorithmName()

Description copied from interface: Digest

return the algorithm name

Specified by:

getAlgorithmName in interface Digest

Returns:

the algorithm name

getDigestSize

public int getDigestSize()

Description copied from interface: Digest

return the size, in bytes, of the digest produced by this message digest.

Specified by:

getDigestSize in interface Digest

Returns:

the size, in bytes, of the digest produced by this message digest.

processWord

private void processWord(byte[] b,
                         int off)

update

public void update(byte in)

Description copied from interface: Digest

update the message digest with a single byte.

Specified by:

update in interface Digest

Parameters:

in - the input byte to be entered.

update

public void update(byte[] in,
                   int inOff,
                   int len)

Description copied from interface: Digest

update the message digest with a block of bytes.

Specified by:

update in interface Digest

Parameters:

in - the byte array containing the data.

inOff - the offset into the byte array where the data starts.

len - the length of the data.

roundABC

private void roundABC(long x,
                      long mul)

roundBCA

private void roundBCA(long x,
                      long mul)

roundCAB

private void roundCAB(long x,
                      long mul)

keySchedule

private void keySchedule()

processBlock

private void processBlock()

unpackWord

public void unpackWord(long r,
                       byte[] out,
                       int outOff)

processLength

private void processLength(long bitLength)

finish

private void finish()

doFinal

public int doFinal(byte[] out,
                   int outOff)

Description copied from interface: Digest

close the digest, producing the final digest value. The doFinal call leaves the digest reset.

Specified by:

doFinal in interface Digest

Parameters:

out - the array the digest is to be copied into.

outOff - the offset into the out array the digest is to start at.

reset

public void reset()

reset the chaining variables

Specified by:

reset in interface Digest

getByteLength

public int getByteLength()

Description copied from interface: ExtendedDigest

Return the size in bytes of the internal buffer the digest applies it's compression function to.

Specified by:

getByteLength in interface ExtendedDigest

Returns:

byte length of the digests internal buffer.