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cryptix.jce.provider.cipher
Class MARS  

java.lang.Object
  javax.crypto.CipherSpi
      cryptix.jce.provider.cipher.BlockCipher
          cryptix.jce.provider.cipher.MARS

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public final class MARS

extends BlockCipher

MARS is an AES candidate submitted by IBM.

MARS was designed by Carolynn Burwick, Don Coppersmith, Edward D'Avignon, Rosario Gennaro, Shai Halevi, Charanjit Jutla, Stephen M. Matyas Jr., Luke O'Connor, Mohammad Peyravian, David Safford, and Nevenko Zunic.

Please note that this is the 'amended' 2nd round version.

Version:

$Revision: 1.3 $

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Field Summary
(package private) static int	BLOCK_SIZE
private  boolean	decrypt           Encrypt (false) or decrypt mode (true)
private  int[]	K           Subkeys (40).
(package private) static int	ROUNDS
private static int[]	S           MARS S-box

 

Fields inherited from class cryptix.jce.provider.cipher.BlockCipher

 

Constructor Summary

MARS()

 

Method Summary
private  void	blockDecrypt(byte[] in, int inOffset, byte[] out, int outOffset)           Decrypt exactly one block of ciphertext.
private  void	blockEncrypt(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[]	E(int in, int key1, int key2)
private  void	generateSubKeys(byte[] key)           Expand a session key into 40 MARS subkeys in int[] this.K .
private static int	maskFrom(int x)           Generate a bit-mask M from x.
private static int	rotl(int arg, int amount)           Rotate left an int by the specified amount.

 

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

static final int BLOCK_SIZE

See Also:

Constant Field Values

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ROUNDS

static final int ROUNDS

See Also:

Constant Field Values

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S

private static final int[] S

MARS S-box

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decrypt

private boolean decrypt

Encrypt (false) or decrypt mode (true)

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K

private final int[] K

Subkeys (40).

Constructor Detail

MARS

public MARS()

Method Detail

coreInit

protected void coreInit(java.security.Key key,
                        boolean decrypt)
                 throws java.security.InvalidKeyException

Specified by:

coreInit in class BlockCipher

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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

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generateSubKeys

private final void generateSubKeys(byte[] key)

Expand a session key into 40 MARS subkeys in int[] this.K .

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maskFrom

private static int maskFrom(int x)

Generate a bit-mask M from x. Bit M{i}=1 iff x{i} belongs to a sequence of 10 consecutive 0's or 1's in x, and also 2 <= i <= 30 and x{i-1} = w{i} = w{i+1}. Code taken from the MARS implementation in C/C++ by Dr. B. R. Gladman (brian.gladman@btinternet.com). This is used during key expansion.

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rotl

private static int rotl(int arg,
                        int amount)

Rotate left an int by the specified amount.

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blockEncrypt

private final void blockEncrypt(byte[] in,
                                int inOffset,
                                byte[] out,
                                int outOffset)

Encrypt exactly one block of plaintext.

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blockDecrypt

private final void blockDecrypt(byte[] in,
                                int inOffset,
                                byte[] out,
                                int outOffset)

Decrypt exactly one block of ciphertext.

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E

private static int[] E(int in,
                       int key1,
                       int key2)

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