org.h2.security

Class XTEA

java.lang.Object

org.h2.security.XTEA

All Implemented Interfaces:

BlockCipher

public class XTEA
extends java.lang.Object
implements BlockCipher

An implementation of the XTEA block cipher algorithm.

This implementation uses 32 rounds. The best attack reported as of 2009 is 36 rounds (Wikipedia).

Field Summary

Fields inherited from interface org.h2.security.BlockCipher

ALIGN

Constructor Summary

Constructors

Constructor and Description
XTEA()

Method Summary

Methods

Modifier and Type	Method and Description
void	decrypt(byte[] bytes, int off, int len) Decrypt a number of bytes.
void	encrypt(byte[] bytes, int off, int len) Encrypt a number of bytes.
int	getKeyLength() Get the length of the key in bytes.
void	setKey(byte[] b) Set the encryption key used for encrypting and decrypting.

Methods inherited from class java.lang.Object

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

Constructor Detail

XTEA

public XTEA()

Method Detail

setKey

public void setKey(byte[] b)

Description copied from interface: BlockCipher

Set the encryption key used for encrypting and decrypting. The key needs to be 16 bytes long.

Specified by:

setKey in interface BlockCipher

Parameters:

b - the key

encrypt

public void encrypt(byte[] bytes,
           int off,
           int len)

Description copied from interface: BlockCipher

Encrypt a number of bytes. This is done in-place, that means the bytes are overwritten.

Specified by:

encrypt in interface BlockCipher

Parameters:

bytes - the byte array

off - the start index

len - the number of bytes to encrypt

decrypt

public void decrypt(byte[] bytes,
           int off,
           int len)

Description copied from interface: BlockCipher

Decrypt a number of bytes. This is done in-place, that means the bytes are overwritten.

Specified by:

decrypt in interface BlockCipher

Parameters:

bytes - the byte array

off - the start index

len - the number of bytes to decrypt

getKeyLength

public int getKeyLength()

Description copied from interface: BlockCipher

Get the length of the key in bytes.

Specified by:

getKeyLength in interface BlockCipher

Returns:

the length of the key