Package 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

Modifier and Type	Field	Description
private static int	DELTA
private int	k0
private int	k1
private int	k10
private int	k11
private int	k12
private int	k13
private int	k14
private int	k15
private int	k16
private int	k17
private int	k18
private int	k19
private int	k2
private int	k20
private int	k21
private int	k22
private int	k23
private int	k24
private int	k25
private int	k26
private int	k27
private int	k28
private int	k29
private int	k3
private int	k30
private int	k31
private int	k4
private int	k5
private int	k6
private int	k7
private int	k8
private int	k9

Fields inherited from interface org.h2.security.BlockCipher

ALIGN

Constructor Summary

Constructors

Constructor	Description
XTEA()

Method Summary

Modifier and Type	Method	Description
void	decrypt(byte[] bytes, int off, int len)	Decrypt a number of bytes.
private void	decryptBlock(byte[] in, byte[] out, int off)
void	encrypt(byte[] bytes, int off, int len)	Encrypt a number of bytes.
private void	encryptBlock(byte[] in, byte[] out, int off)
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

Field Detail

DELTA

private static final int DELTA

See Also:

Constant Field Values

k0

private int k0

k1

private int k1

k2

private int k2

k3

private int k3

k4

private int k4

k5

private int k5

k6

private int k6

k7

private int k7

k8

private int k8

k9

private int k9

k10

private int k10

k11

private int k11

k12

private int k12

k13

private int k13

k14

private int k14

k15

private int k15

k16

private int k16

k17

private int k17

k18

private int k18

k19

private int k19

k20

private int k20

k21

private int k21

k22

private int k22

k23

private int k23

k24

private int k24

k25

private int k25

k26

private int k26

k27

private int k27

k28

private int k28

k29

private int k29

k30

private int k30

k31

private int k31

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

encryptBlock

private void encryptBlock(byte[] in,
                          byte[] out,
                          int off)

decryptBlock

private void decryptBlock(byte[] in,
                          byte[] out,
                          int off)

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