Package org.apache.poi.poifs.crypt

Class ChunkedCipherOutputStream

java.lang.Object

java.io.OutputStream

java.io.FilterOutputStream

org.apache.poi.poifs.crypt.ChunkedCipherOutputStream

All Implemented Interfaces:

java.io.Closeable, java.io.Flushable, java.lang.AutoCloseable

@Internal
public abstract class ChunkedCipherOutputStream
extends java.io.FilterOutputStream

Constructor Summary

Constructors

Constructor	Description
ChunkedCipherOutputStream(java.io.OutputStream stream, int chunkSize)
ChunkedCipherOutputStream(DirectoryNode dir, int chunkSize)

Method Summary

Modifier and Type	Method	Description
void	close()
javax.crypto.Cipher	initCipherForBlock(int block, boolean lastChunk)
void	setNextRecordSize(int recordSize, boolean isPlain)	Some ciphers (actually just XOR) are based on the record size, which needs to be set before encryption
void	write(byte[] b)
void	write(byte[] b, int off, int len)
void	write(int b)
void	writePlain(byte[] b, int off, int len)

Methods inherited from class java.io.FilterOutputStream

flush

Methods inherited from class java.io.OutputStream

nullOutputStream

Methods inherited from class java.lang.Object

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

Constructor Detail

ChunkedCipherOutputStream

public ChunkedCipherOutputStream(DirectoryNode dir,
                                 int chunkSize)
                          throws java.io.IOException,
                                 java.security.GeneralSecurityException

Throws:

java.io.IOException

java.security.GeneralSecurityException

ChunkedCipherOutputStream

public ChunkedCipherOutputStream(java.io.OutputStream stream,
                                 int chunkSize)
                          throws java.io.IOException,
                                 java.security.GeneralSecurityException

Throws:

java.io.IOException

java.security.GeneralSecurityException

Method Detail

initCipherForBlock

public final javax.crypto.Cipher initCipherForBlock(int block,
                                                    boolean lastChunk)
                                             throws java.io.IOException,
                                                    java.security.GeneralSecurityException

Throws:

java.io.IOException

java.security.GeneralSecurityException

write

public void write(int b)
           throws java.io.IOException

Overrides:

write in class java.io.FilterOutputStream

Throws:

java.io.IOException

write

public void write(byte[] b)
           throws java.io.IOException

Overrides:

write in class java.io.FilterOutputStream

Throws:

java.io.IOException

write

public void write(byte[] b,
                  int off,
                  int len)
           throws java.io.IOException

Overrides:

write in class java.io.FilterOutputStream

Throws:

java.io.IOException

writePlain

public void writePlain(byte[] b,
                       int off,
                       int len)
                throws java.io.IOException

Throws:

java.io.IOException

close

public void close()
           throws java.io.IOException

Specified by:

close in interface java.lang.AutoCloseable

Specified by:

close in interface java.io.Closeable

Overrides:

close in class java.io.FilterOutputStream

Throws:

java.io.IOException

setNextRecordSize

public void setNextRecordSize(int recordSize,
                              boolean isPlain)

Some ciphers (actually just XOR) are based on the record size, which needs to be set before encryption

Parameters:

recordSize - the size of the next record

isPlain - true if the record is unencrypted