fr.cryptohash

Class Tiger2

java.lang.Object

fr.cryptohash.DigestEngine

fr.cryptohash.Tiger2

All Implemented Interfaces:

Digest

public class Tiger2
extends DigestEngine

This class implements the Tiger2 hash algorithm under the Digest API. Tiger2 differs from Tiger by the padding, which is identical to that of MD4/MD5 in Tiger2, but not in Tiger.

 ==========================(LICENSE BEGIN)============================

 Copyright (c) 2007-2010  Projet RNRT SAPHIR
 
 Permission is hereby granted, free of charge, to any person obtaining
 a copy of this software and associated documentation files (the
 "Software"), to deal in the Software without restriction, including
 without limitation the rights to use, copy, modify, merge, publish,
 distribute, sublicense, and/or sell copies of the Software, and to
 permit persons to whom the Software is furnished to do so, subject to
 the following conditions:
 
 The above copyright notice and this permission notice shall be
 included in all copies or substantial portions of the Software.
 
 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
 IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
 CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
 TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
 SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

 ===========================(LICENSE END)=============================
 

Version:

$Revision: 214 $

Author:

Thomas Pornin <thomas.pornin@cryptolog.com>

Constructor Summary

Constructors

Constructor and Description
Tiger2() Create the engine.

Method Summary

Modifier and Type	Method and Description
Digest	copy() Clone the current state.
protected Digest	copyState(fr.cryptohash.TigerCore dst)
protected void	doInit() This function is called at object creation time; the implementation should use it to perform initialization tasks.
protected void	doPadding(byte[] output, int outputOffset) Perform the final padding and store the result in the provided buffer.
protected void	engineReset() Reset the hash algorithm state.
int	getBlockLength() Return the "block length" for the hash function.
int	getDigestLength() Get the natural hash function output length (in bytes).
protected void	makeMDPadding() Compute the padding.
protected void	processBlock(byte[] data) Process one block of data.
String	toString() Get the display name for this function (e.g.

Methods inherited from class fr.cryptohash.DigestEngine

copyState, digest, digest, digest, flush, getBlockBuffer, getBlockCount, getInternalBlockLength, reset, update, update, update

Methods inherited from class java.lang.Object

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

Constructor Detail

Tiger2

public Tiger2()

Create the engine.

Method Detail

copy

public Digest copy()

Description copied from interface: Digest

Clone the current state. The returned object evolves independantly of this object.

Returns:

the clone

See Also:

Digest

toString

public String toString()

Description copied from interface: Digest

Get the display name for this function (e.g. "SHA-1" for SHA-1).

Specified by:

toString in interface Digest

Overrides:

toString in class Object

See Also:

Digest

copyState

protected Digest copyState(fr.cryptohash.TigerCore dst)

See Also:

DigestEngine

getDigestLength

public int getDigestLength()

Description copied from interface: Digest

Get the natural hash function output length (in bytes).

Returns:

the digest output length (in bytes)

See Also:

Digest

getBlockLength

public int getBlockLength()

Description copied from interface: Digest

Return the "block length" for the hash function. This value is naturally defined for iterated hash functions (Merkle-Damgard). It is used in HMAC (that's what the HMAC specification names the "B" parameter).

If the function is "block-less" then this function may return -n where n is an integer such that the block length for HMAC ("B") will be inferred from the key length, by selecting the smallest multiple of n which is no smaller than the key length. For instance, for the Fugue-xxx hash functions, this function returns -4: the virtual block length B is the HMAC key length, rounded up to the next multiple of 4.

Returns:

the internal block length (in bytes), or -n

See Also:

Digest

engineReset

protected void engineReset()

Description copied from class: DigestEngine

Reset the hash algorithm state.

Specified by:

engineReset in class DigestEngine

See Also:

DigestEngine

doPadding

protected void doPadding(byte[] output,
                         int outputOffset)

Description copied from class: DigestEngine

Perform the final padding and store the result in the provided buffer. This method shall call DigestEngine.flush() and then DigestEngine.update(byte) with the appropriate padding data in order to get the full input data.

Specified by:

doPadding in class DigestEngine

Parameters:

output - the output buffer

outputOffset - the output offset

See Also:

DigestEngine

doInit

protected void doInit()

Description copied from class: DigestEngine

This function is called at object creation time; the implementation should use it to perform initialization tasks. After this method is called, the implementation should be ready to process data or meaningfully honour calls such as Digest.getDigestLength().

Specified by:

doInit in class DigestEngine

See Also:

DigestEngine

processBlock

protected void processBlock(byte[] data)

Description copied from class: DigestEngine

Process one block of data.

Specified by:

processBlock in class DigestEngine

Parameters:

data - the data block

See Also:

DigestEngine

makeMDPadding

protected void makeMDPadding()

Compute the padding. The padding data is input into the engine, which is flushed.