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

public Class RC2Engine

extends Object
implements BlockCipher
Class Inheritance
All Implemented Interfaces
org.bouncycastle.crypto.BlockCipher
Imports
org.bouncycastle.crypto.*, org.bouncycastle.crypto.constraints.DefaultServiceProperties, org.bouncycastle.crypto.params.KeyParameter, .RC2Parameters
an implementation of RC2 as described in RFC 2268 "A Description of the RC2(r) Encryption Algorithm" R. Rivest.

Field Summary

Modifier and TypeField and Description
private static final int
BLOCK_SIZE

private boolean
encrypting

private static byte[]
piTable

private int[]
workingKey

Constructor Summary

AccessConstructor and Description
public
RC2Engine()

Method Summary

Modifier and TypeMethod and Description
private void
decryptBlock(byte[] in, int inOff, byte[] out, int outOff)

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

private int[]
generateWorkingKey(byte[] key, int bits)

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

Implements org.bouncycastle.crypto.BlockCipher.init.

initialise a RC2 cipher.

public final 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.

private int
rotateWordLeft(int x, int y)

return the result rotating the 16 bit number in x left by y

Inherited from java.lang.Object:
cloneequalsfinalizegetClasshashCodenotifynotifyAlltoStringwaitwaitwait

Field Detail

BLOCK_SIZEback to summary
private static final int BLOCK_SIZE
encryptingback to summary
private boolean encrypting
piTableback to summary
private static byte[] piTable
workingKeyback to summary
private int[] workingKey

Constructor Detail

RC2Engineback to summary
public RC2Engine()

Method Detail

decryptBlockback to summary
private void decryptBlock(byte[] in, int inOff, byte[] out, int outOff)
encryptBlockback to summary
private void encryptBlock(byte[] in, int inOff, byte[] out, int outOff)
generateWorkingKeyback to summary
private int[] generateWorkingKey(byte[] key, int bits)
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.

initback to summary
public void init(boolean encrypting, CipherParameters params)

Implements org.bouncycastle.crypto.BlockCipher.init.

initialise a RC2 cipher.

Parameters
encrypting: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.
processBlockback to summary
public final 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).

rotateWordLeftback to summary
private int rotateWordLeft(int x, int y)

return the result rotating the 16 bit number in x left by y