org.bouncycastle.crypto

Class StreamBlockCipher

java.lang.Object

org.bouncycastle.crypto.StreamBlockCipher

All Implemented Interfaces:

BlockCipher, StreamCipher

Direct Known Subclasses:

CFBBlockCipher, GCFBBlockCipher, GOFBBlockCipher, OFBBlockCipher, SICBlockCipher

public abstract class StreamBlockCipher
extends Object
implements BlockCipher, StreamCipher

A parent class for block cipher modes that do not require block aligned data to be processed, but can function in a streaming mode.

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	StreamBlockCipher(BlockCipher cipher)

Method Summary

Methods

Modifier and Type	Method and Description
protected abstract byte	calculateByte(byte b)
BlockCipher	getUnderlyingCipher() return the underlying block cipher that we are wrapping.
int	processBytes(byte[] in, int inOff, int len, byte[] out, int outOff) process a block of bytes from in putting the result into out.
byte	returnByte(byte in) encrypt/decrypt a single byte returning the result.

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.bouncycastle.crypto.BlockCipher

getAlgorithmName, getBlockSize, init, processBlock, reset

Methods inherited from interface org.bouncycastle.crypto.StreamCipher

getAlgorithmName, init, reset

Constructor Detail

StreamBlockCipher

protected StreamBlockCipher(BlockCipher cipher)

Method Detail

getUnderlyingCipher

public BlockCipher getUnderlyingCipher()

return the underlying block cipher that we are wrapping.

Returns:

the underlying block cipher that we are wrapping.

returnByte

public final byte returnByte(byte in)

Description copied from interface: StreamCipher

encrypt/decrypt a single byte returning the result.

Specified by:

returnByte in interface StreamCipher

Parameters:

in - the byte to be processed.

Returns:

the result of processing the input byte.

processBytes

public int processBytes(byte[] in,
               int inOff,
               int len,
               byte[] out,
               int outOff)
                 throws DataLengthException

Description copied from interface: StreamCipher

process a block of bytes from in putting the result into out.

Specified by:

processBytes in interface StreamCipher

Parameters:

in - the input byte array.

inOff - the offset into the in array where the data to be processed starts.

len - the number of bytes to be processed.

out - the output buffer the processed bytes go into.

outOff - the offset into the output byte array the processed data starts at.

Returns:

the number of bytes produced - should always be len.

Throws:

DataLengthException - if the output buffer is too small.

calculateByte

protected abstract byte calculateByte(byte b)