jodd.crypt

Class Threefish

java.lang.Object

jodd.crypt.BlockCipher

jodd.crypt.Threefish

public class Threefish
extends BlockCipher

Threefish cipher. http://www.schneier.com/threefish.html

Field Summary

Fields

Modifier and Type	Field and Description
static int	BLOCK_SIZE_BITS_1024
static int	BLOCK_SIZE_BITS_256
static int	BLOCK_SIZE_BITS_512

Fields inherited from class jodd.crypt.BlockCipher

blockSizeInBytes, TERMINATOR

Constructor Summary

Constructors

Constructor and Description
Threefish(int blockSize) Threefish implementation using the specified blocksize in bits.
Threefish(int blockSize, int rounds) Threefish implementation using the specified blocksize in bits, specifying the number of rounds directly instead of using the default number of rounds depending on the blockSize.

Method Summary

Modifier and Type	Method and Description
void	blockDecrypt(long[] c, long[] p) Implementation of the D(K, T, C) function.
void	blockEncrypt(long[] p, long[] c) Implementation of the E(K, T, P) function.
protected static long[]	bytesToLongs(byte[] ba)
protected static long[]	bytesToLongs(byte[] ba, int offset, int size) Converts segment of byte array into long array.
byte[]	decryptBlock(byte[] encryptedContent, int offset) Decrypts single block of encrypted content.
java.lang.String	decryptString(byte[] encrypted) Decrypts a string.
byte[]	encryptBlock(byte[] content, int offset) Encrypts a block.
byte[]	encryptString(java.lang.String plain) Encrypts a string.
void	init(long[] key, long[] tweak) Initialize the cipher using the key and the tweak value.
void	init(java.lang.String keyMessage, long tweak1, long tweak2) Initializes cipher in a simple way.
protected static byte[]	longsToBytes(long[] la)

Methods inherited from class jodd.crypt.BlockCipher

decrypt, encrypt

Methods inherited from class java.lang.Object

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

Field Detail

BLOCK_SIZE_BITS_256

public static final int BLOCK_SIZE_BITS_256

See Also:

Constant Field Values

BLOCK_SIZE_BITS_512

public static final int BLOCK_SIZE_BITS_512

See Also:

Constant Field Values

BLOCK_SIZE_BITS_1024

public static final int BLOCK_SIZE_BITS_1024

See Also:

Constant Field Values

Constructor Detail

Threefish

public Threefish(int blockSize)

Threefish implementation using the specified blocksize in bits.

Parameters:

blockSize - either 256, 512 or 1024 (bits)

Threefish

public Threefish(int blockSize,
                 int rounds)

Threefish implementation using the specified blocksize in bits, specifying the number of rounds directly instead of using the default number of rounds depending on the blockSize. Mainly used for (performance) testing purposes.

Parameters:

blockSize - either 256, 512 or 1024 (bits)

rounds - the number of rounds 1..2^31, must be multiple of 4

Method Detail

init

public void init(long[] key,
                 long[] tweak)

Initialize the cipher using the key and the tweak value.

Parameters:

key - the Threefish key to use

tweak - the tweak values to use

blockEncrypt

public void blockEncrypt(long[] p,
                         long[] c)

Implementation of the E(K, T, P) function. The K and T values should be set previously using the init() method. This version is the 64 bit implementation of Threefish.

Parameters:

p - the initial plain text

c - the final value defined as value v{d} where d = N{r}

blockDecrypt

public void blockDecrypt(long[] c,
                         long[] p)

Implementation of the D(K, T, C) function. The K and T values should be set previously using the init() method. This version is the 64 bit implementation of Threefish.

Parameters:

c - the cipher text

p - the plain text

init

public void init(java.lang.String keyMessage,
                 long tweak1,
                 long tweak2)

Initializes cipher in a simple way.

encryptBlock

public byte[] encryptBlock(byte[] content,
                           int offset)

Encrypts a block.

Specified by:

encryptBlock in class BlockCipher

decryptBlock

public byte[] decryptBlock(byte[] encryptedContent,
                           int offset)

Description copied from class: BlockCipher

Decrypts single block of encrypted content.

Specified by:

decryptBlock in class BlockCipher

encryptString

public byte[] encryptString(java.lang.String plain)

Encrypts a string.

decryptString

public java.lang.String decryptString(byte[] encrypted)

Decrypts a string.

bytesToLongs

protected static long[] bytesToLongs(byte[] ba)

bytesToLongs

protected static long[] bytesToLongs(byte[] ba,
                                     int offset,
                                     int size)

Converts segment of byte array into long array.

longsToBytes

protected static byte[] longsToBytes(long[] la)