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com.tangosol.net.security
Class BlockCipherOutputStream

java.lang.Object
java.io.OutputStream
java.io.FilterOutputStream
com.tangosol.net.security.BlockCipherOutputStream

All Implemented Interfaces:

Closeable, Flushable

public class BlockCipherOutputStream

extends FilterOutputStream

InputStream which supports block ciphers, and data sizes which exceed the Cipher's block size.

Author:

mf 2006.08.08

Field Summary

protected byte[]	m_abBlockClear The current block of unencrypted data
protected Cipher	m_cipher The Encryption Cipher
protected int	m_nBlockIndex The next available index to write into the unencrypted data block.

Fields inherited from class java.io.FilterOutputStream

out

Constructor Summary

BlockCipherOutputStream(OutputStream stream, Cipher cipher)
Construct a BlockCipherOutputStream around the supplied stream and encrypt output data with the supplied cipher.

BlockCipherOutputStream(OutputStream stream, Cipher cipher, int cbBlock)
Construct a BlockCipherOutputStream around the supplied stream and encrypt output data with the supplied cipher.

Method Summary

void	flush()
void	write(byte[] abData, int nOffset, int nLength)
void	write(int bData)
protected void	writeBlock() Write the current clear block to the wrapped stream.

Methods inherited from class java.io.FilterOutputStream

close, write

Field Detail

m_cipher

protected Cipher m_cipher

The Encryption Cipher

m_abBlockClear

protected byte[] m_abBlockClear

The current block of unencrypted data

m_nBlockIndex

protected int m_nBlockIndex

The next available index to write into the unencrypted data block.

Constructor Detail

BlockCipherOutputStream

public BlockCipherOutputStream(OutputStream stream,
                               Cipher cipher)

Construct a BlockCipherOutputStream around the supplied stream and encrypt output data with the supplied cipher.

Parameters:

stream - the stream to write encrypted data to

cipher - the cipher to use to encrypt data

BlockCipherOutputStream

public BlockCipherOutputStream(OutputStream stream,
                               Cipher cipher,
                               int cbBlock)

Construct a BlockCipherOutputStream around the supplied stream and encrypt output data with the supplied cipher.

Parameters:

stream - the stream to write encrypted data to

cipher - the cipher to use to encrypt data

cbBlock - the size of an unencrypted block required by the cipher

Method Detail

flush

public void flush()
           throws IOException

Specified by:

flush in interface Flushable

Overrides:

flush in class FilterOutputStream

Throws:

IOException

write

public void write(int bData)
           throws IOException

Overrides:

write in class FilterOutputStream

Throws:

IOException

write

public void write(byte[] abData,
                  int nOffset,
                  int nLength)
           throws IOException

Overrides:

write in class FilterOutputStream

Throws:

IOException

writeBlock

protected void writeBlock()
                   throws IOException

Write the current clear block to the wrapped stream.

Throws:

IOException

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