net.sf.gridarta.utils.Xtea Class Reference

Collaboration diagram for net.sf.gridarta.utils.Xtea:

Public Member Functions
void	decrypt (final byte @NotNull[] ciphertext, final byte @NotNull[] plaintext)
void	encrypt (final byte @NotNull[] plaintext, final byte @NotNull[] ciphertext)
	Xtea (final byte @NotNull[] key)

Static Private Member Functions
static int	getInt (final byte @NotNull[] data, final int offset)
static void	putInt (final int value, final byte @NotNull[] data, final int offset)

Private Attributes
final int[]	k = new int[4]

Static Private Attributes
static final int	DELTA = 0x9E3779B9
static final int	NUM_ROUNDS = 32

Detailed Description

Implements the XTEA algorithm.

Author

Andreas Kirschbaum

Definition at line 28 of file Xtea.java.

Constructor & Destructor Documentation

Xtea()

net.sf.gridarta.utils.Xtea.Xtea

(

final byte @NotNull[]

key

)

Creates a new instance.

Parameters

key	the key to use; must be 16 bytes

Definition at line 49 of file Xtea.java.

References net.sf.gridarta.utils.Xtea.getInt(), and net.sf.gridarta.utils.Xtea.k.

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Member Function Documentation

decrypt()

void net.sf.gridarta.utils.Xtea.decrypt	(	final byte @NotNull[]	ciphertext,
		final byte @NotNull[]	plaintext
	)

Decrypts a data block.

Parameters

ciphertext	the block to decrypt; must be 8 bytes
plaintext	the decrypted block; must be 8 bytes

Definition at line 89 of file Xtea.java.

References net.sf.gridarta.utils.Xtea.DELTA, net.sf.gridarta.utils.Xtea.getInt(), net.sf.gridarta.utils.Xtea.k, net.sf.gridarta.utils.Xtea.NUM_ROUNDS, and net.sf.gridarta.utils.Xtea.putInt().

Referenced by net.sf.gridarta.utils.XteaTest.test().

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encrypt()

void net.sf.gridarta.utils.Xtea.encrypt	(	final byte @NotNull[]	plaintext,
		final byte @NotNull[]	ciphertext
	)

Encrypts a data block.

Parameters

plaintext	the block to encrypt; must be 8 bytes
ciphertext	the encrypted block; must be 8 bytes

Definition at line 65 of file Xtea.java.

References net.sf.gridarta.utils.Xtea.DELTA, net.sf.gridarta.utils.Xtea.getInt(), net.sf.gridarta.utils.Xtea.k, net.sf.gridarta.utils.Xtea.NUM_ROUNDS, and net.sf.gridarta.utils.Xtea.putInt().

Referenced by net.sf.gridarta.model.index.MapsIndexer< G, A, R >.getCacheFile(), and net.sf.gridarta.utils.XteaTest.test().

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getInt()

static int net.sf.gridarta.utils.Xtea.getInt ( final byte @NotNull[]  data, final int  offset  )

staticprivate

Converts 4 data bytes to an

int 

.

Parameters

data	the data array
offset	the starting offset into data

Returns

the

int 

value

Definition at line 115 of file Xtea.java.

Referenced by net.sf.gridarta.utils.Xtea.decrypt(), net.sf.gridarta.utils.Xtea.encrypt(), and net.sf.gridarta.utils.Xtea.Xtea().

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putInt()

static void net.sf.gridarta.utils.Xtea.putInt ( final int  value, final byte @NotNull[]  data, final int  offset  )

staticprivate

Converts an

int 

value into 4 data bytes.

Parameters

value	the int value
data	the data array
offset	the starting offset into data

Definition at line 125 of file Xtea.java.

Referenced by net.sf.gridarta.utils.Xtea.decrypt(), and net.sf.gridarta.utils.Xtea.encrypt().

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Member Data Documentation

DELTA

final int net.sf.gridarta.utils.Xtea.DELTA = 0x9E3779B9

staticprivate

The magic constant (1<<32)/PHI.

Definition at line 38 of file Xtea.java.

Referenced by net.sf.gridarta.utils.Xtea.decrypt(), and net.sf.gridarta.utils.Xtea.encrypt().

k

final int [] net.sf.gridarta.utils.Xtea.k = new int[4]

private

The state.

Definition at line 43 of file Xtea.java.

Referenced by net.sf.gridarta.utils.Xtea.decrypt(), net.sf.gridarta.utils.Xtea.encrypt(), and net.sf.gridarta.utils.Xtea.Xtea().

NUM_ROUNDS

final int net.sf.gridarta.utils.Xtea.NUM_ROUNDS = 32

staticprivate

The number of rounds.

Definition at line 33 of file Xtea.java.

Referenced by net.sf.gridarta.utils.Xtea.decrypt(), and net.sf.gridarta.utils.Xtea.encrypt().

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The documentation for this class was generated from the following file:

• src/utils/src/main/java/net/sf/gridarta/utils/Xtea.java