net.sf.gridarta.utils.Xtea Class Reference

Implements the XTEA algorithm. More...

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Public Member Functions
void	decrypt (@NotNull final byte[] ciphertext, @NotNull final byte[] plaintext)
	Decrypts a data block. More...
void	encrypt (@NotNull final byte[] plaintext, @NotNull final byte[] ciphertext)
	Encrypts a data block. More...
	Xtea (@NotNull final byte[] key)
	Creates a new instance. More...

Static Private Member Functions
static int	getInt (@NotNull final byte[] data, final int offset)
	Converts 4 data bytes to an. More...
static void	putInt (final int value, @NotNull final byte[] data, final int offset)
	Converts an. More...

Private Attributes
final int []	k = new int[4]
	The state. More...

Static Private Attributes
static final int	DELTA = 0x9E3779B9
	The magic constant (1<<32)/PHI. More...
static final int	NUM_ROUNDS = 32
	The number of rounds. More...

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

(

@NotNull final byte []

key

)

Creates a new instance.

Parameters

key	the key to use; must be 16 bytes

Definition at line 50 of file Xtea.java.

References net.sf.gridarta.utils.Xtea.getInt().

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Member Function Documentation

decrypt()

void net.sf.gridarta.utils.Xtea.decrypt	(	@NotNull final byte []	ciphertext,
		@NotNull final byte []	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 90 of file Xtea.java.

References net.sf.gridarta.utils.Xtea.DELTA, net.sf.gridarta.utils.Xtea.getInt(), 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	(	@NotNull final byte []	plaintext,
		@NotNull final byte []	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 66 of file Xtea.java.

References net.sf.gridarta.utils.Xtea.DELTA, net.sf.gridarta.utils.Xtea.getInt(), 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 ( @NotNull final byte []  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 116 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, @NotNull final byte []  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 126 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 44 of file Xtea.java.

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:

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