Package org.h2.store.fs.encrypt

Class XTS

java.lang.Object

org.h2.store.fs.encrypt.XTS

class XTS
extends Object

An XTS implementation as described in IEEE P1619 (Standard Architecture for Encrypted Shared Storage Media). See also http://axelkenzo.ru/downloads/1619-2007-NIST-Submission.pdf

Field Summary

Fields

Modifier and Type	Field	Description
private final BlockCipher	cipher
private static final int	CIPHER_BLOCK_SIZE	The AES encryption block size.
private static final int	GF_128_FEEDBACK	Galois field feedback.

Constructor Summary

Constructors

Constructor	Description
XTS(BlockCipher cipher)

Method Summary

Modifier and Type	Method	Description
(package private) void	decrypt(long id, int len, byte[] data, int offset)	Decrypt the data.
(package private) void	encrypt(long id, int len, byte[] data, int offset)	Encrypt the data.
private byte[]	initTweak(long id)
private static void	swap(byte[] data, int source, int target, int len)
private static void	updateTweak(byte[] tweak)
private static void	xorTweak(byte[] data, int pos, byte[] tweak)

Methods inherited from class java.lang.Object

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

Field Details

GF_128_FEEDBACK

private static final int GF_128_FEEDBACK

Galois field feedback.

See Also:

• Constant Field Values

CIPHER_BLOCK_SIZE

private static final int CIPHER_BLOCK_SIZE

The AES encryption block size.

See Also:

• Constant Field Values

cipher

private final BlockCipher cipher

Constructor Details

XTS

XTS(BlockCipher cipher)

Method Details

encrypt

void encrypt(long id,
 int len,
 byte[] data,
 int offset)

Encrypt the data.

Parameters:

id - the (sector) id

len - the number of bytes

data - the data

offset - the offset within the data

decrypt

void decrypt(long id,
 int len,
 byte[] data,
 int offset)

Decrypt the data.

Parameters:

id - the (sector) id

len - the number of bytes

data - the data

offset - the offset within the data

initTweak

private byte[] initTweak(long id)

xorTweak

private static void xorTweak(byte[] data,
 int pos,
 byte[] tweak)

updateTweak

private static void updateTweak(byte[] tweak)

swap

private static void swap(byte[] data,
 int source,
 int target,
 int len)