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SUMMARY: JavaDoc of cryptix.jce.provider.cipher.Twofish JAVADOC | Sourc code of cryptix.jce.provider.cipher.Twofish SOURCE | Download cryptix.jce.provider.cipher.Twofish DOWNLOAD | NESTED | FIELD | CONSTR | METHOD DETAIL: FIELD | CONSTR | METHOD

cryptix.jce.provider.cipher
Class Twofish  view Twofish download Twofish.java

java.lang.Object
  extended byjavax.crypto.CipherSpi
      extended bycryptix.jce.provider.cipher.BlockCipher
          extended bycryptix.jce.provider.cipher.Twofish
public final class Twofish
extends BlockCipher

Twofish is an AES candidate algorithm. It is a balanced 128-bit Feistel cipher, consisting of 16 rounds. In each round, a 64-bit S-box value is computed from 64 bits of the block, and this value is xored into the other half of the block. The two half-blocks are then exchanged, and the next round begins. Before the first round, all input bits are xored with key- dependent "whitening" subkeys, and after the final round the output bits are xored with other key-dependent whitening subkeys; these subkeys are not used anywhere else in the algorithm.

Twofish was submitted by Bruce Schneier, Doug Whiting, John Kelsey, Chris Hall and David Wagner.

Reference:

  1. TWOFISH2.C -- Optimized C API calls for TWOFISH AES submission, Version 1.00, April 1998, by Doug Whiting.

Version:
$Revision: 1.4 $

Field Summary
private static int BLOCK_SIZE
           
private  boolean decrypt
          Encrypt (false) or decrypt mode (true)
private static int GF256_FDBK
          Primitive polynomial for GF(256)
private static int GF256_FDBK_2
          Primitive polynomial for GF(256)
private static int GF256_FDBK_4
          Primitive polynomial for GF(256)
private static int[][] MDS
          MDS matrix
private static byte[][] P
          Fixed 8x8 permutation S-boxes
private static int P_00
          Define the fixed p0/p1 permutations used in keyed S-box lookup.
private static int P_01
          Define the fixed p0/p1 permutations used in keyed S-box lookup.
private static int P_02
          Define the fixed p0/p1 permutations used in keyed S-box lookup.
private static int P_03
          Define the fixed p0/p1 permutations used in keyed S-box lookup.
private static int P_04
          Define the fixed p0/p1 permutations used in keyed S-box lookup.
private static int P_10
          Define the fixed p0/p1 permutations used in keyed S-box lookup.
private static int P_11
          Define the fixed p0/p1 permutations used in keyed S-box lookup.
private static int P_12
          Define the fixed p0/p1 permutations used in keyed S-box lookup.
private static int P_13
          Define the fixed p0/p1 permutations used in keyed S-box lookup.
private static int P_14
          Define the fixed p0/p1 permutations used in keyed S-box lookup.
private static int P_20
          Define the fixed p0/p1 permutations used in keyed S-box lookup.
private static int P_21
          Define the fixed p0/p1 permutations used in keyed S-box lookup.
private static int P_22
          Define the fixed p0/p1 permutations used in keyed S-box lookup.
private static int P_23
          Define the fixed p0/p1 permutations used in keyed S-box lookup.
private static int P_24
          Define the fixed p0/p1 permutations used in keyed S-box lookup.
private static int P_30
          Define the fixed p0/p1 permutations used in keyed S-box lookup.
private static int P_31
          Define the fixed p0/p1 permutations used in keyed S-box lookup.
private static int P_32
          Define the fixed p0/p1 permutations used in keyed S-box lookup.
private static int P_33
          Define the fixed p0/p1 permutations used in keyed S-box lookup.
private static int P_34
          Define the fixed p0/p1 permutations used in keyed S-box lookup.
private static int ROUNDS
           
private static int RS_GF_FDBK
           
private  int[] sBox
          Key dependent S-box
private static int SK_BUMP
           
private static int SK_ROTL
           
private  int[] subKeys
          Subkeys
private static int TOTAL_SUBKEYS
           
 
Fields inherited from class cryptix.jce.provider.cipher.BlockCipher
 
Constructor Summary
Twofish()
           
 
Method Summary
private static int _b(int x, int N)
           
private static int b0(int x)
           
private static int b1(int x)
           
private static int b2(int x)
           
private static int b3(int x)
           
private  void blockCrypt(byte[] in, int inOffset, byte[] out, int outOffset)
          Encrypt exactly one block of plaintext.
protected  void coreCrypt(byte[] in, int inOffset, byte[] out, int outOffset)
          Encrypt a given buffer.
protected  void coreInit(java.security.Key key, boolean decrypt)
           
private static int F32(int k64Cnt, int x, int[] k32)
           
private static int Fe32(int[] sBox, int x, int R)
           
private static int LFSR1(int x)
           
private static int LFSR2(int x)
           
private  void makeSubKeys(byte[] k)
          Expand a user-supplied key material into a session key.
private static int Mx_1(int x)
           
private static int Mx_X(int x)
           
private static int Mx_Y(int x)
           
private static int RS_MDS_Encode(int k0, int k1)
          Use (12, 8) Reed-Solomon code over GF(256) to produce a key S-box 32-bit entity from two key material 32-bit entities.
private static int RS_rem(int x)
           
 
Methods inherited from class cryptix.jce.provider.cipher.BlockCipher
clone, coreGetBlockSize, engineDoFinal, engineDoFinal, engineGetBlockSize, engineGetIV, engineGetKeySize, engineGetOutputSize, engineGetParameters, engineInit, engineInit, engineInit, engineSetMode, engineSetPadding, engineUpdate, engineUpdate
 
Methods inherited from class javax.crypto.CipherSpi
engineDoFinal, engineUnwrap, engineUpdate, engineWrap
 
Methods inherited from class java.lang.Object
equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Field Detail

BLOCK_SIZE

private static final int BLOCK_SIZE
See Also:
Constant Field Values

ROUNDS

private static final int ROUNDS
See Also:
Constant Field Values

TOTAL_SUBKEYS

private static final int TOTAL_SUBKEYS
See Also:
Constant Field Values

SK_BUMP

private static final int SK_BUMP
See Also:
Constant Field Values

SK_ROTL

private static final int SK_ROTL
See Also:
Constant Field Values

P

private static final byte[][] P
Fixed 8x8 permutation S-boxes

P_00

private static final int P_00
Define the fixed p0/p1 permutations used in keyed S-box lookup. By changing the following constant definitions, the S-boxes will automatically get changed in the Twofish engine.

See Also:
Constant Field Values

P_01

private static final int P_01
Define the fixed p0/p1 permutations used in keyed S-box lookup. By changing the following constant definitions, the S-boxes will automatically get changed in the Twofish engine.

See Also:
Constant Field Values

P_02

private static final int P_02
Define the fixed p0/p1 permutations used in keyed S-box lookup. By changing the following constant definitions, the S-boxes will automatically get changed in the Twofish engine.

See Also:
Constant Field Values

P_03

private static final int P_03
Define the fixed p0/p1 permutations used in keyed S-box lookup. By changing the following constant definitions, the S-boxes will automatically get changed in the Twofish engine.

See Also:
Constant Field Values

P_04

private static final int P_04
Define the fixed p0/p1 permutations used in keyed S-box lookup. By changing the following constant definitions, the S-boxes will automatically get changed in the Twofish engine.

See Also:
Constant Field Values

P_10

private static final int P_10
Define the fixed p0/p1 permutations used in keyed S-box lookup. By changing the following constant definitions, the S-boxes will automatically get changed in the Twofish engine.

See Also:
Constant Field Values

P_11

private static final int P_11
Define the fixed p0/p1 permutations used in keyed S-box lookup. By changing the following constant definitions, the S-boxes will automatically get changed in the Twofish engine.

See Also:
Constant Field Values

P_12

private static final int P_12
Define the fixed p0/p1 permutations used in keyed S-box lookup. By changing the following constant definitions, the S-boxes will automatically get changed in the Twofish engine.

See Also:
Constant Field Values

P_13

private static final int P_13
Define the fixed p0/p1 permutations used in keyed S-box lookup. By changing the following constant definitions, the S-boxes will automatically get changed in the Twofish engine.

See Also:
Constant Field Values

P_14

private static final int P_14
Define the fixed p0/p1 permutations used in keyed S-box lookup. By changing the following constant definitions, the S-boxes will automatically get changed in the Twofish engine.

See Also:
Constant Field Values

P_20

private static final int P_20
Define the fixed p0/p1 permutations used in keyed S-box lookup. By changing the following constant definitions, the S-boxes will automatically get changed in the Twofish engine.

See Also:
Constant Field Values

P_21

private static final int P_21
Define the fixed p0/p1 permutations used in keyed S-box lookup. By changing the following constant definitions, the S-boxes will automatically get changed in the Twofish engine.

See Also:
Constant Field Values

P_22

private static final int P_22
Define the fixed p0/p1 permutations used in keyed S-box lookup. By changing the following constant definitions, the S-boxes will automatically get changed in the Twofish engine.

See Also:
Constant Field Values

P_23

private static final int P_23
Define the fixed p0/p1 permutations used in keyed S-box lookup. By changing the following constant definitions, the S-boxes will automatically get changed in the Twofish engine.

See Also:
Constant Field Values

P_24

private static final int P_24
Define the fixed p0/p1 permutations used in keyed S-box lookup. By changing the following constant definitions, the S-boxes will automatically get changed in the Twofish engine.

See Also:
Constant Field Values

P_30

private static final int P_30
Define the fixed p0/p1 permutations used in keyed S-box lookup. By changing the following constant definitions, the S-boxes will automatically get changed in the Twofish engine.

See Also:
Constant Field Values

P_31

private static final int P_31
Define the fixed p0/p1 permutations used in keyed S-box lookup. By changing the following constant definitions, the S-boxes will automatically get changed in the Twofish engine.

See Also:
Constant Field Values

P_32

private static final int P_32
Define the fixed p0/p1 permutations used in keyed S-box lookup. By changing the following constant definitions, the S-boxes will automatically get changed in the Twofish engine.

See Also:
Constant Field Values

P_33

private static final int P_33
Define the fixed p0/p1 permutations used in keyed S-box lookup. By changing the following constant definitions, the S-boxes will automatically get changed in the Twofish engine.

See Also:
Constant Field Values

P_34

private static final int P_34
Define the fixed p0/p1 permutations used in keyed S-box lookup. By changing the following constant definitions, the S-boxes will automatically get changed in the Twofish engine.

See Also:
Constant Field Values

GF256_FDBK

private static final int GF256_FDBK
Primitive polynomial for GF(256)

See Also:
Constant Field Values

GF256_FDBK_2

private static final int GF256_FDBK_2
Primitive polynomial for GF(256)

See Also:
Constant Field Values

GF256_FDBK_4

private static final int GF256_FDBK_4
Primitive polynomial for GF(256)

See Also:
Constant Field Values

MDS

private static final int[][] MDS
MDS matrix

RS_GF_FDBK

private static final int RS_GF_FDBK
See Also:
Constant Field Values

decrypt

private boolean decrypt
Encrypt (false) or decrypt mode (true)

sBox

private final int[] sBox
Key dependent S-box

subKeys

private final int[] subKeys
Subkeys

Constructor Detail

Twofish

public Twofish()
Method Detail

LFSR1

private static final int LFSR1(int x)

LFSR2

private static final int LFSR2(int x)

Mx_1

private static final int Mx_1(int x)

Mx_X

private static final int Mx_X(int x)

Mx_Y

private static final int Mx_Y(int x)

coreInit

protected void coreInit(java.security.Key key,
                        boolean decrypt)
                 throws java.security.InvalidKeyException
Specified by:
coreInit in class BlockCipher

coreCrypt

protected void coreCrypt(byte[] in,
                         int inOffset,
                         byte[] out,
                         int outOffset)
Description copied from class: BlockCipher
Encrypt a given buffer. in and out can point to the same buffer if (outOffset == inOffset) || (outOffset >= (inOffset+coreGetBlockSize)) That is: the buffers may not partially overlap...

Specified by:
coreCrypt in class BlockCipher

makeSubKeys

private final void makeSubKeys(byte[] k)
                        throws java.security.InvalidKeyException
Expand a user-supplied key material into a session key.

blockCrypt

private final void blockCrypt(byte[] in,
                              int inOffset,
                              byte[] out,
                              int outOffset)
Encrypt exactly one block of plaintext. Blocks may overlap.

b0

private static final int b0(int x)

b1

private static final int b1(int x)

b2

private static final int b2(int x)

b3

private static final int b3(int x)

RS_MDS_Encode

private static final int RS_MDS_Encode(int k0,
                                       int k1)
Use (12, 8) Reed-Solomon code over GF(256) to produce a key S-box 32-bit entity from two key material 32-bit entities.

RS_rem

private static final int RS_rem(int x)

F32

private static final int F32(int k64Cnt,
                             int x,
                             int[] k32)

Fe32

private static final int Fe32(int[] sBox,
                              int x,
                              int R)

_b

private static final int _b(int x,
                            int N)
Overview  Package   Class  Use  Deprecated  Index 
Home >> All >> cryptix >> jce >> provider >> [ cipher overview ]  PREV CLASS  NEXT CLASS
SUMMARY: JavaDoc of cryptix.jce.provider.cipher.Twofish JAVADOC | Sourc code of cryptix.jce.provider.cipher.Twofish SOURCE | Download cryptix.jce.provider.cipher.Twofish DOWNLOAD | NESTED | FIELD | CONSTR | METHOD DETAIL: FIELD | CONSTR | METHOD