org.bouncycastle.crypto.engines
Class GOST28147Engine

java.lang.Object
  |
  +--org.bouncycastle.crypto.engines.GOST28147Engine

All Implemented Interfaces:

BlockCipher

public class GOST28147Engine

extends java.lang.Object

implements BlockCipher

implementation of GOST 28147-89

Field Summary

protected static int

BLOCK_SIZE

Constructor Summary

GOST28147Engine()
standard constructor.

Method Summary

java.lang.String	getAlgorithmName() Return the name of the algorithm the cipher implements.
int	getBlockSize() Return the block size for this cipher (in bytes).
static byte[]	getSBox(java.lang.String sBoxName) Return the S-Box associated with SBoxName
static java.lang.String	getSBoxName(byte[] sBox)
void	init(boolean forEncryption, CipherParameters params) initialise an GOST28147 cipher.
int	processBlock(byte[] in, int inOff, byte[] out, int outOff) Process one block of input from the array in and write it to the out array.
void	reset() Reset the cipher.

Methods inherited from class java.lang.Object

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

Field Detail

BLOCK_SIZE

protected static final int BLOCK_SIZE

Constructor Detail

GOST28147Engine

public GOST28147Engine()

standard constructor.

Method Detail

init

public void init(boolean forEncryption,
                 CipherParameters params)

initialise an GOST28147 cipher.

Specified by:

init in interface BlockCipher

Parameters:

forEncryption - whether or not we are for encryption.

params - the parameters required to set up the cipher.

Throws:

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

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

Following copied from interface: org.bouncycastle.crypto.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

Following copied from interface: org.bouncycastle.crypto.BlockCipher

Returns:

the block size for this cipher in bytes.

processBlock

public int processBlock(byte[] in,
                        int inOff,
                        byte[] out,
                        int outOff)

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

Following copied from interface: org.bouncycastle.crypto.BlockCipher

Parameters:

input - the array containing the input data.

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

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

outOff - 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 input , or space in out.

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

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

getSBox

public static byte[] getSBox(java.lang.String sBoxName)

Return the S-Box associated with SBoxName

Parameters:

sBoxName - name of the S-Box

Returns:

byte array representing the S-Box

getSBoxName

public static java.lang.String getSBoxName(byte[] sBox)