Bouncy Castle Cryptography Library 1.80 · org.bouncycastle.crypto.engines.RC564Engine

Modifier and Type	Field and Description
private int	_noRounds
private long[]	_S
private static final int	bytesPerWord
private boolean	forEncryption
private static final long	P64
private static final long	Q64
private static final int	wordSize

Access	Constructor and Description
public	RC564Engine() Create an instance of the RC5 encryption algorithm and set some defaults

Method Summary

Modifier and Type	Method and Description
private long	bytesToWord(byte[] src, int srcOff)
private int	decryptBlock(byte[] in, int inOff, byte[] out, int outOff)
private int	encryptBlock(byte[] in byte buffer containing data to encrypt in, int offset into src buffer inOff, byte[] out buffer where encrypted data is written out, int offset into out buffer outOff) Encrypt the given block starting at the given offset and place the result in the provided buffer starting at the given offset.
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. forEncryption, CipherParameters the parameters required to set up the cipher. params) Implements org.bouncycastle.crypto.BlockCipher.init. initialise a RC5-64 cipher.
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.
private long	rotateLeft(long word to rotate x, long number of bits to rotate % wordSize y) Perform a left "spin" of the word.
private long	rotateRight(long word to rotate x, long number of bits to rotate % wordSize y) Perform a right "spin" of the word.
private void	setKey(byte[] the key to be used key) Re-key the cipher.
private void	wordToBytes(long word, byte[] dst, int dstOff)

Inherited from java.lang.Object:: clone equals finalize getClass hashCode notify notifyAll toString wait wait wait

_noRounds	back to summary
private int _noRounds

_S	back to summary
private long[] _S

bytesPerWord	back to summary
private static final int bytesPerWord

forEncryption	back to summary
private boolean forEncryption

P64	back to summary
private static final long P64

Q64	back to summary
private static final long Q64

wordSize	back to summary
private static final int wordSize

RC564Engine	back to summary
public RC564Engine() Create an instance of the RC5 encryption algorithm and set some defaults

Method Detail

bytesToWord	back to summary
private long bytesToWord(byte[] src, int srcOff)

decryptBlock	back to summary
private int decryptBlock(byte[] in, int inOff, byte[] out, int outOff)

encryptBlock	back to summary
private int encryptBlock(byte[] in, int inOff, byte[] out, int outOff) Encrypt the given block starting at the given offset and place the result in the provided buffer starting at the given offset. Parameters in:byte[] in byte buffer containing data to encrypt inOff:int offset into src buffer out:byte[] out buffer where encrypted data is written outOff:int offset into out buffer

encryptBlock

back to summary

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

Encrypt the given block starting at the given offset and place the result in the provided buffer starting at the given offset.

Parameters

in:byte[]: in byte buffer containing data to encrypt
inOff:int: offset into src buffer
out:byte[]: out buffer where encrypted data is written
outOff:int: offset into out buffer

getAlgorithmName	back 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.

getAlgorithmName

back 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.

getBlockSize	back 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.

getBlockSize

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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.

init	back to summary
public void init(boolean forEncryption, CipherParameters params) Implements org.bouncycastle.crypto.BlockCipher.init. initialise a RC5-64 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.

init

back to summary

public void init(boolean forEncryption, CipherParameters params)

Implements org.bouncycastle.crypto.BlockCipher.init.

initialise a RC5-64 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.

processBlock	back 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.

processBlock

back 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.

reset	back 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).

reset

back 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).

rotateLeft	back to summary
private long rotateLeft(long x, long y) Perform a left "spin" of the word. The rotation of the given word x is rotated left by y bits. Only the lg(wordSize) low-order bits of y are used to determine the rotation amount. Here it is assumed that the wordsize used is a power of 2. Parameters x:long word to rotate y:long number of bits to rotate % wordSize

rotateLeft

back to summary

private long rotateLeft(long x, long y)

Perform a left "spin" of the word. The rotation of the given word x is rotated left by y bits. Only the lg(wordSize) low-order bits of y are used to determine the rotation amount. Here it is assumed that the wordsize used is a power of 2.

Parameters

x:long: word to rotate
y:long: number of bits to rotate % wordSize

rotateRight	back to summary
private long rotateRight(long x, long y) Perform a right "spin" of the word. The rotation of the given word x is rotated left by y bits. Only the lg(wordSize) low-order bits of y are used to determine the rotation amount. Here it is assumed that the wordsize used is a power of 2. Parameters x:long word to rotate y:long number of bits to rotate % wordSize

rotateRight

back to summary

private long rotateRight(long x, long y)

Perform a right "spin" of the word. The rotation of the given word x is rotated left by y bits. Only the lg(wordSize) low-order bits of y are used to determine the rotation amount. Here it is assumed that the wordsize used is a power of 2.

Parameters

x:long: word to rotate
y:long: number of bits to rotate % wordSize

setKey	back to summary
private void setKey(byte[] key) Re-key the cipher. Parameters key:byte[] the key to be used

setKey

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private void setKey(byte[] key)

Re-key the cipher.

Parameters

key:byte[]: the key to be used

wordToBytes	back to summary
private void wordToBytes(long word, byte[] dst, int dstOff)

public Class RC564Engine

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