Top Description Fields Constructors Methods
org.apache.pdfbox.pdmodel.encryption

pack-priv Class RC4Cipher

extends Object
Class Inheritance
Imports
java.io.IOException, .InputStream, .OutputStream
An implementation of the RC4 stream cipher.
Author
Ben Litchfield

Field Summary

Modifier and TypeField and Description
private int
b

private int
c

private final int[]
salt

Constructor Summary

AccessConstructor and Description
pack-priv
RC4Cipher()

Constructor.

Method Summary

Modifier and TypeMethod and Description
private static int

Returns:

A value >=0 and < 256
fixByte(byte
The byte to test against.
aByte)

This will ensure that the value for a byte >=0.

public void
setKey(byte[]
The RC4 key used during encryption.
key)

This will reset the key to be used.

private static void
swap(int[]
The array to swap from.
data, int
The index of the first element to swap.
firstIndex, int
The index of the second element to swap.
secondIndex)

This will swap two values in an array.

public void
write(byte
The byte to encrypt.
aByte, OutputStream
The stream to write to.
output)

This will encrypt and write the next byte.

public void
write(byte[]
The data to encrypt.
data, OutputStream
The stream to write to.
output)

This will encrypt and write the data.

public void
write(InputStream
The data to encrypt.
data, OutputStream
The stream to write to.
output)

This will encrypt and write the data.

public void
write(byte[]
The data to encrypt.
data, int
The offset into the array to start reading data from.
offset, int
The number of bytes to attempt to read.
len, OutputStream
The stream to write to.
output)

This will encrypt and write the data.

Inherited from java.lang.Object:
cloneequalsfinalizegetClasshashCodenotifynotifyAlltoStringwaitwaitwait

Field Detail

bback to summary
private int b
cback to summary
private int c
saltback to summary
private final int[] salt

Constructor Detail

RC4Cipherback to summary
pack-priv RC4Cipher()

Constructor.

Method Detail

fixByteback to summary
private static int fixByte(byte aByte)

This will ensure that the value for a byte >=0.

Parameters
aByte:byte

The byte to test against.

Returns:int

A value >=0 and < 256

setKeyback to summary
public void setKey(byte[] key)

This will reset the key to be used.

Parameters
key:byte[]

The RC4 key used during encryption.

swapback to summary
private static void swap(int[] data, int firstIndex, int secondIndex)

This will swap two values in an array.

Parameters
data:int[]

The array to swap from.

firstIndex:int

The index of the first element to swap.

secondIndex:int

The index of the second element to swap.

writeback to summary
public void write(byte aByte, OutputStream output) throws IOException

This will encrypt and write the next byte.

Parameters
aByte:byte

The byte to encrypt.

output:OutputStream

The stream to write to.

Exceptions
IOException:
If there is an error writing to the output stream.
writeback to summary
public void write(byte[] data, OutputStream output) throws IOException

This will encrypt and write the data.

Parameters
data:byte[]

The data to encrypt.

output:OutputStream

The stream to write to.

Exceptions
IOException:
If there is an error writing to the output stream.
writeback to summary
public void write(InputStream data, OutputStream output) throws IOException

This will encrypt and write the data.

Parameters
data:InputStream

The data to encrypt.

output:OutputStream

The stream to write to.

Exceptions
IOException:
If there is an error writing to the output stream.
writeback to summary
public void write(byte[] data, int offset, int len, OutputStream output) throws IOException

This will encrypt and write the data.

Parameters
data:byte[]

The data to encrypt.

offset:int

The offset into the array to start reading data from.

len:int

The number of bytes to attempt to read.

output:OutputStream

The stream to write to.

Exceptions
IOException:
If there is an error writing to the output stream.