Package org.apache.poi.poifs.crypt
Class ChunkedCipherOutputStream
- java.lang.Object
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- java.io.OutputStream
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- java.io.FilterOutputStream
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- org.apache.poi.poifs.crypt.ChunkedCipherOutputStream
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- 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
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Constructor Summary
Constructors Constructor Description ChunkedCipherOutputStream(java.io.OutputStream stream, int chunkSize)
ChunkedCipherOutputStream(DirectoryNode dir, int chunkSize)
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Method Summary
All Methods Instance Methods Abstract Methods Concrete Methods Modifier and Type Method 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()
javax.crypto.Cipher
initCipherForBlock(int block, boolean lastChunk)
protected abstract javax.crypto.Cipher
initCipherForBlock(javax.crypto.Cipher existing, 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 encryptionvoid
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)
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Constructor Detail
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ChunkedCipherOutputStream
public ChunkedCipherOutputStream(DirectoryNode dir, int chunkSize) throws java.io.IOException, java.security.GeneralSecurityException
- Throws:
java.io.IOException
java.security.GeneralSecurityException
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ChunkedCipherOutputStream
public ChunkedCipherOutputStream(java.io.OutputStream stream, int chunkSize) throws java.io.IOException, java.security.GeneralSecurityException
- Throws:
java.io.IOException
java.security.GeneralSecurityException
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Method Detail
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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
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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
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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
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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
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write
public void write(int b) throws java.io.IOException
- Overrides:
write
in classjava.io.FilterOutputStream
- Throws:
java.io.IOException
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write
public void write(byte[] b) throws java.io.IOException
- Overrides:
write
in classjava.io.FilterOutputStream
- Throws:
java.io.IOException
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write
public void write(byte[] b, int off, int len) throws java.io.IOException
- Overrides:
write
in classjava.io.FilterOutputStream
- Throws:
java.io.IOException
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writePlain
public void writePlain(byte[] b, int off, int len) throws java.io.IOException
- Throws:
java.io.IOException
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write
protected void write(byte[] b, int off, int len, boolean writePlain) throws java.io.IOException
- Throws:
java.io.IOException
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getChunkMask
protected int getChunkMask()
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writeChunk
protected void writeChunk(boolean continued) throws java.io.IOException
- Throws:
java.io.IOException
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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
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close
public void close() throws java.io.IOException
- Specified by:
close
in interfacejava.lang.AutoCloseable
- Specified by:
close
in interfacejava.io.Closeable
- Overrides:
close
in classjava.io.FilterOutputStream
- Throws:
java.io.IOException
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getChunk
protected byte[] getChunk()
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getPlainByteFlags
protected java.util.BitSet getPlainByteFlags()
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getPos
protected long getPos()
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getTotalPos
protected long getTotalPos()
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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 recordisPlain
-true
if the record is unencrypted
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