org.spongycastle.crypto.engines

Class Shacal2Engine

java.lang.Object

org.spongycastle.crypto.engines.Shacal2Engine

All Implemented Interfaces:

BlockCipher

public class Shacal2Engine
extends java.lang.Object
implements BlockCipher

Block cipher Shacal2, designed by Helena Handschuh and David Naccache, based on hash function SHA-256, using SHA-256-Initialization-Values as data and SHA-256-Data as key.

A description of Shacal can be found at: http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.3.4066 Best known cryptanalytic (Wikipedia 11.2013): Related-key rectangle attack on 44-rounds (Jiqiang Lu, Jongsung Kim). Comments are related to SHA-256-Naming as described in FIPS PUB 180-2

Constructor Summary

Constructors

Constructor and Description
Shacal2Engine()

Method Summary

Modifier and Type	Method and Description
java.lang.String	getAlgorithmName() Return the name of the algorithm the cipher implements.
int	getBlockSize() Return the block size for this cipher (in bytes).
void	init(boolean _forEncryption, CipherParameters params) Initialise the cipher.
int	processBlock(byte[] in, int inOffset, byte[] out, int outOffset) Process one block of input from the array in and write it to the out array.
void	reset() Reset the cipher.
void	setKey(byte[] kb)

Methods inherited from class java.lang.Object

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

Constructor Detail

Shacal2Engine

public Shacal2Engine()

Method Detail

reset

public void reset()

Description copied from interface: BlockCipher

Reset the cipher. After resetting the cipher is in the same state as it was after the last init (if there was one).

Specified by:

reset in interface BlockCipher

getAlgorithmName

public java.lang.String getAlgorithmName()

Description copied from interface: BlockCipher

Return the name of the algorithm the cipher implements.

Specified by:

getAlgorithmName in interface BlockCipher

Returns:

the name of the algorithm the cipher implements.

getBlockSize

public int getBlockSize()

Description copied from interface: BlockCipher

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

Specified by:

getBlockSize in interface BlockCipher

Returns:

the block size for this cipher in bytes.

init

public void init(boolean _forEncryption,
                 CipherParameters params)
          throws java.lang.IllegalArgumentException

Description copied from interface: BlockCipher

Initialise the cipher.

Specified by:

init in interface BlockCipher

Parameters:

_forEncryption - if true the cipher is initialised for encryption, if false for decryption.

params - the key and other data required by the cipher.

Throws:

java.lang.IllegalArgumentException - if the params argument is inappropriate.

setKey

public void setKey(byte[] kb)

processBlock

public int processBlock(byte[] in,
                        int inOffset,
                        byte[] out,
                        int outOffset)
                 throws DataLengthException,
                        java.lang.IllegalStateException

Description copied from interface: BlockCipher

Process one block of input from the array in and write it to the out array.

Specified by:

processBlock in interface BlockCipher

Parameters:

in - the array containing the input data.

inOffset - offset into the in array the data starts at.

out - the array the output data will be copied into.

outOffset - the offset into the out array the output will start at.

Returns:

the number of bytes processed and produced.

Throws:

DataLengthException - if there isn't enough data in in, or space in out.

java.lang.IllegalStateException - if the cipher isn't initialised.