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

Direct Known Subclasses:

BinaryRC4Encryptor.BinaryRC4CipherOutputStream, CryptoAPIEncryptor.CryptoAPICipherOutputStream

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

Field Summary

Fields inherited from class java.io.FilterOutputStream

out

Constructor Summary

Constructors

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

Method Summary

Modifier and Type	Method and Description
protected abstract void	calculateChecksum(java.io.File fileOut, int oleStreamSize)
void	close()
protected abstract void	createEncryptionInfoEntry(DirectoryNode dir, java.io.File tmpFile)
protected byte[]	getChunk()
protected int	getChunkMask()
protected java.util.BitSet	getPlainByteFlags()
protected long	getPos()
protected long	getTotalPos()
protected abstract javax.crypto.Cipher	initCipherForBlock(javax.crypto.Cipher existing, int block, boolean lastChunk)
javax.crypto.Cipher	initCipherForBlock(int block, boolean lastChunk)
protected int	invokeCipher(int posInChunk, boolean doFinal) Helper function for overriding the cipher invocation, i.e.
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)
protected void	write(byte[] b, int off, int len, boolean writePlain)
void	write(int b)
protected void	writeChunk(boolean continued)
void	writePlain(byte[] b, int off, int len)

Methods inherited from class java.io.FilterOutputStream

flush

Methods inherited from class java.lang.Object

clone, equals, finalize, 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

initCipherForBlock

protected abstract javax.crypto.Cipher initCipherForBlock(javax.crypto.Cipher existing,
                                                          int block,
                                                          boolean lastChunk)
                                                   throws java.io.IOException,
                                                          java.security.GeneralSecurityException

Throws:

java.io.IOException

java.security.GeneralSecurityException

calculateChecksum

protected abstract void calculateChecksum(java.io.File fileOut,
                                          int oleStreamSize)
                                   throws java.security.GeneralSecurityException,
                                          java.io.IOException

Throws:

java.security.GeneralSecurityException

java.io.IOException

createEncryptionInfoEntry

protected abstract void createEncryptionInfoEntry(DirectoryNode dir,
                                                  java.io.File tmpFile)
                                           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

write

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

Throws:

java.io.IOException

getChunkMask

protected int getChunkMask()

writeChunk

protected void writeChunk(boolean continued)
                   throws java.io.IOException

Throws:

java.io.IOException

invokeCipher

protected int invokeCipher(int posInChunk,
                           boolean doFinal)
                    throws java.security.GeneralSecurityException

Helper function for overriding the cipher invocation, i.e. XOR doesn't use a cipher and uses it's own implementation

Throws:

javax.crypto.BadPaddingException

javax.crypto.IllegalBlockSizeException

javax.crypto.ShortBufferException

java.security.GeneralSecurityException

close

public void close()
           throws java.io.IOException

Specified by:

close in interface java.io.Closeable

Specified by:

close in interface java.lang.AutoCloseable

Overrides:

close in class java.io.FilterOutputStream

Throws:

java.io.IOException

getChunk

protected byte[] getChunk()

getPlainByteFlags

protected java.util.BitSet getPlainByteFlags()

getPos

protected long getPos()

getTotalPos

protected long getTotalPos()

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