Top Description Fields Constructors Methods
org.bouncycastle.crypto.engines

public Class GOST28147Engine

extends Object
implements BlockCipher
Class Inheritance
All Implemented Interfaces
org.bouncycastle.crypto.BlockCipher
Imports
java.util.Enumeration, .Hashtable, org.bouncycastle.crypto.BlockCipher, .CipherParameters, .CryptoServicesRegistrar, .DataLengthException, .OutputLengthException, org.bouncycastle.crypto.constraints.DefaultServiceProperties, org.bouncycastle.crypto.params.KeyParameter, .ParametersWithSBox, org.bouncycastle.util.Arrays, .Strings
implementation of GOST 28147-89

Field Summary

Modifier and TypeField and Description
protected static final int
BLOCK_SIZE

private static byte[]
DSbox_A

private static byte[]
DSbox_Test

private static byte[]
ESbox_A

private static byte[]
ESbox_B

private static byte[]
ESbox_C

private static byte[]
ESbox_D

private static byte[]
ESbox_Test

private boolean
forEncryption

private static byte[]
Param_Z

private byte[]
S

private static byte[]
Sbox_Default

private static Hashtable<K, V>
sBoxes

private int[]
workingKey

Constructor Summary

AccessConstructor and Description
public
GOST28147Engine()

standard constructor.

Method Summary

Modifier and TypeMethod and Description
private static void
addSBox(String sBoxName, byte[] sBox)

private int
bytesToint(byte[] in, int inOff)

private int[]
generateWorkingKey(boolean forEncryption, byte[] userKey)

public String
getAlgorithmName()

Implements org.bouncycastle.crypto.BlockCipher.getAlgorithmName.

Return the name of the algorithm the cipher implements.
public int
getBlockSize()

Implements org.bouncycastle.crypto.BlockCipher.getBlockSize.

Return the block size for this cipher (in bytes).
public static byte[]

Returns:

byte array representing the S-Box
getSBox(String
name of the S-Box
sBoxName)

Return the S-Box associated with SBoxName

public static String
getSBoxName(byte[] sBox)

private int
GOST28147_mainStep(int n1, int key)

private void
GOST28147Func(int[] workingKey, byte[] in, int inOff, byte[] out, int outOff)

public void
init(boolean
whether or not we are for encryption.
forEncryption, CipherParameters
the parameters required to set up the cipher.
params)

Implements org.bouncycastle.crypto.BlockCipher.init.

initialise an GOST28147 cipher.
private void
intTobytes(int num, byte[] out, int outOff)

public int
processBlock(byte[]
the array containing the input data.
in, int
offset into the in array the data starts at.
inOff, byte[]
the array the output data will be copied into.
out, int
the offset into the out array the output will start at.
outOff)

Implements org.bouncycastle.crypto.BlockCipher.processBlock.

Process one block of input from the array in and write it to the out array.
public void
reset()

Implements org.bouncycastle.crypto.BlockCipher.reset.

Reset the cipher.
Inherited from java.lang.Object:
cloneequalsfinalizegetClasshashCodenotifynotifyAlltoStringwaitwaitwait

Field Detail

BLOCK_SIZEback to summary
protected static final int BLOCK_SIZE
DSbox_Aback to summary
private static byte[] DSbox_A
DSbox_Testback to summary
private static byte[] DSbox_Test
ESbox_Aback to summary
private static byte[] ESbox_A
ESbox_Bback to summary
private static byte[] ESbox_B
ESbox_Cback to summary
private static byte[] ESbox_C
ESbox_Dback to summary
private static byte[] ESbox_D
ESbox_Testback to summary
private static byte[] ESbox_Test
forEncryptionback to summary
private boolean forEncryption
Param_Zback to summary
private static byte[] Param_Z
Sback to summary
private byte[] S
Sbox_Defaultback to summary
private static byte[] Sbox_Default
sBoxesback to summary
private static Hashtable<K, V> sBoxes
workingKeyback to summary
private int[] workingKey

Constructor Detail

GOST28147Engineback to summary
public GOST28147Engine()

standard constructor.

Method Detail

addSBoxback to summary
private static void addSBox(String sBoxName, byte[] sBox)
bytesTointback to summary
private int bytesToint(byte[] in, int inOff)
generateWorkingKeyback to summary
private int[] generateWorkingKey(boolean forEncryption, byte[] userKey)
getAlgorithmNameback to summary
public String getAlgorithmName()

Implements org.bouncycastle.crypto.BlockCipher.getAlgorithmName.

Doc from org.bouncycastle.crypto.BlockCipher.getAlgorithmName.

Return the name of the algorithm the cipher implements.

Returns:String

the name of the algorithm the cipher implements.

getBlockSizeback to summary
public int getBlockSize()

Implements org.bouncycastle.crypto.BlockCipher.getBlockSize.

Doc from org.bouncycastle.crypto.BlockCipher.getBlockSize.

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

Returns:int

the block size for this cipher in bytes.

getSBoxback to summary
public static byte[] getSBox(String sBoxName)

Return the S-Box associated with SBoxName

Parameters
sBoxName:String

name of the S-Box

Returns:byte[]

byte array representing the S-Box

getSBoxNameback to summary
public static String getSBoxName(byte[] sBox)
GOST28147_mainStepback to summary
private int GOST28147_mainStep(int n1, int key)
GOST28147Funcback to summary
private void GOST28147Func(int[] workingKey, byte[] in, int inOff, byte[] out, int outOff)
initback to summary
public void init(boolean forEncryption, CipherParameters params)

Implements org.bouncycastle.crypto.BlockCipher.init.

initialise an GOST28147 cipher.

Parameters
forEncryption:boolean

whether or not we are for encryption.

params:CipherParameters

the parameters required to set up the cipher.

Exceptions
IllegalArgumentException:
if the params argument is inappropriate.
intTobytesback to summary
private void intTobytes(int num, byte[] out, int outOff)
processBlockback to summary
public int processBlock(byte[] in, int inOff, byte[] out, int outOff)

Implements org.bouncycastle.crypto.BlockCipher.processBlock.

Doc from org.bouncycastle.crypto.BlockCipher.processBlock.

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

Parameters
in:byte[]

the array containing the input data.

inOff:int

offset into the in array the data starts at.

out:byte[]

the array the output data will be copied into.

outOff:int

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

Returns:int

the number of bytes processed and produced.

resetback to summary
public void reset()

Implements org.bouncycastle.crypto.BlockCipher.reset.

Doc from org.bouncycastle.crypto.BlockCipher.reset.

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