se.entra.phantom.common

Class DefaultCrypto

java.lang.Object

se.entra.phantom.common.DefaultCrypto

public class DefaultCrypto
extends Object

This interface defines the cryptographic interface for the client/server communication. The encryption algorithm is NOT intended for advanced encryption, rather to hide otherwise "visible" data such as user ID's and passwords.

Constructor Summary

Constructors

Constructor and Description
DefaultCrypto() The default cryptographic interface only implements the most simple way of garbling the byte data.

Method Summary

Modifier and Type	Method and Description
static byte[]	compress(byte[] data) Tries to compress the input data to a smaller chunk.
static byte[]	compress(byte[] data, int offset, int length) Tries to compress the input data to a smaller chunk.
static byte[]	decompress(byte[] data) Decompress the data.
byte[]	decrypt(byte[] data) Decrypts the data (can also decompress it if required).
byte[]	encrypt(byte[] data) Encrypts the data (can also compress it if required).
byte[]	encrypt(byte[] data, int offset, int endOffset) Encrypts the data (can also compress it if required).

Methods inherited from class java.lang.Object

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

Constructor Detail

DefaultCrypto

public DefaultCrypto()

The default cryptographic interface only implements the most simple way of garbling the byte data.

In this implementation, nothing needs to be done in the constructor.

Method Detail

encrypt

public byte[] encrypt(byte[] data)

Encrypts the data (can also compress it if required). The decrypt method has to make sure that the same data that is input to the encrypt method is provided as a return to this method.

Note: if any changes to the buffer is required and the buffer is of the same length, use the original buffer in order to spare the virtual machine of any memory freeing. In this case, the same buffer is returned as only the content have changed, not the size.

encrypt

public byte[] encrypt(byte[] data,
                      int offset,
                      int endOffset)

Encrypts the data (can also compress it if required). The decrypt method has to make sure that the same data that is input to the encrypt method is provided as a return to this method.

Note: if any changes to the buffer is required and the buffer is of the same length, use the original buffer in order to spare the virtual machine of any memory freeing. In this case, the same buffer is returned as only the content have changed, not the size.

decrypt

public byte[] decrypt(byte[] data)

Decrypts the data (can also decompress it if required).

Note: if any changes to the buffer is required and the buffer is of the same length, use the original buffer in order to spare the virtual machine of any memory freeing. In this case, the same buffer is returned as only the content have changed, not the size.

compress

public static byte[] compress(byte[] data)

Tries to compress the input data to a smaller chunk. If this chunk is not at least 5% smaller, the best thing is to use the data uncompressed and in this case the function will return null.

Parameters:

data - the input data to compress.

Returns:

the compressed data, or null if there is no need for compression.

compress

public static byte[] compress(byte[] data,
                              int offset,
                              int length)

Tries to compress the input data to a smaller chunk. If this chunk is not at least 5% smaller, the best thing is to use the data uncompressed and in this case the function will return null.

Parameters:

data - the input data to compress.

Returns:

the compressed data, or null if there is no need for compression.

decompress

public static byte[] decompress(byte[] data)
                         throws IOException

Decompress the data.

Returns:

The uncompressed data.

Throws:

IOException - for uncompress errors.