org.apache.poi.hssf.record.crypto

Class Biff8XOR

java.lang.Object

org.apache.poi.hssf.record.crypto.Biff8XOR

All Implemented Interfaces:

Biff8Cipher

public class Biff8XOR
extends java.lang.Object
implements Biff8Cipher

Constructor Summary

Constructors

Constructor and Description
Biff8XOR(int initialOffset, Biff8XORKey key)

Method Summary

Modifier and Type	Method and Description
void	setNextRecordSize(int recordSize)
void	skipTwoBytes() Used when BIFF header fields (sid, size) are being read.
void	startRecord(int currentSid)
void	xor(byte[] buf, int pOffset, int pLen) Decrypts a xor obfuscated byte array.
int	xorByte(int rawVal)
int	xorInt(int rawVal)
long	xorLong(long rawVal)
int	xorShort(int rawVal)

Methods inherited from class java.lang.Object

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

Constructor Detail

Biff8XOR

public Biff8XOR(int initialOffset,
                Biff8XORKey key)

Method Detail

startRecord

public void startRecord(int currentSid)

Specified by:

startRecord in interface Biff8Cipher

setNextRecordSize

public void setNextRecordSize(int recordSize)

Specified by:

setNextRecordSize in interface Biff8Cipher

skipTwoBytes

public void skipTwoBytes()

Used when BIFF header fields (sid, size) are being read. The internal Cipher instance must step even when unencrypted bytes are read

Specified by:

skipTwoBytes in interface Biff8Cipher

xor

public void xor(byte[] buf,
                int pOffset,
                int pLen)

Decrypts a xor obfuscated byte array. The data is decrypted in-place

Specified by:

xor in interface Biff8Cipher

See Also:

2.3.7.3 Binary Document XOR Data Transformation Method 1

xorByte

public int xorByte(int rawVal)

Specified by:

xorByte in interface Biff8Cipher

xorShort

public int xorShort(int rawVal)

Specified by:

xorShort in interface Biff8Cipher

xorInt

public int xorInt(int rawVal)

Specified by:

xorInt in interface Biff8Cipher

xorLong

public long xorLong(long rawVal)

Specified by:

xorLong in interface Biff8Cipher