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cryptix.jce.provider.cipher
Class Blowfish  

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

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public final class Blowfish

extends BlockCipher

This class implements the Blowfish algorithm (standard, 16 round version). Blowfish is a symmetric block cipher, with a 64-bit blocksize and a variable key length (between 40 and 448 bits inclusive, in 8-bit increments).

References:

• Bruce Schneier, "Section 14.3 Blowfish," Applied Cryptography, 2nd edition, John Wiley & Sons, 1996
• Bruce Schneier, Description of a New Variable-Length Key, 64-Bit Cipher (Blowfish), Fast Software Encryption Cambridge Security Workshop Proceedings, Springer-Verlag, 1004, pp 191-204.
• http://www.counterpane.com/blowfish.html

The implementation is heavily optimized (but we can still do better):

• The P-box and S-box data is encoded in a string to save on .class-file size
• P-box entries are stored in individual integers Pxx
• The loops have been unrolled
• Encryption & decryption use the same algorithm

Speed optimizations thanks to Peter Hjelt . Additional speed and size optimizations by gelderen .

Version:

$Revision: 1.6 $

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Field Summary
private static int	BLOCK_SIZE           Self eplanatory constants
private static java.lang.String	cP           Compressed initial values for the P-box and S-boxes
private static java.lang.String	cS           Compressed initial values for the P-box and S-boxes
private  int	K00           Individual ints representing the session key taken from int[] P.
private  int	K01           Individual ints representing the session key taken from int[] P.
private  int	K02           Individual ints representing the session key taken from int[] P.
private  int	K03           Individual ints representing the session key taken from int[] P.
private  int	K04           Individual ints representing the session key taken from int[] P.
private  int	K05           Individual ints representing the session key taken from int[] P.
private  int	K06           Individual ints representing the session key taken from int[] P.
private  int	K07           Individual ints representing the session key taken from int[] P.
private  int	K08           Individual ints representing the session key taken from int[] P.
private  int	K09           Individual ints representing the session key taken from int[] P.
private  int	K10           Individual ints representing the session key taken from int[] P.
private  int	K11           Individual ints representing the session key taken from int[] P.
private  int	K12           Individual ints representing the session key taken from int[] P.
private  int	K13           Individual ints representing the session key taken from int[] P.
private  int	K14           Individual ints representing the session key taken from int[] P.
private  int	K15           Individual ints representing the session key taken from int[] P.
private  int	K16           Individual ints representing the session key taken from int[] P.
private  int	K17           Individual ints representing the session key taken from int[] P.
private static int	MAX_USER_KEY_LENGTH           Self eplanatory constants
private static int	MIN_USER_KEY_LENGTH           Self eplanatory constants
private  int[]	P           P-box, used during key-setup
private static int	ROUNDS           Self eplanatory constants
private  int[]	S0           4 S-boxes
private  int[]	S1           4 S-boxes
private  int[]	S2           4 S-boxes
private  int[]	S3           4 S-boxes
private static int[]	sP           P-box and S-boxes
private static int[]	sS           P-box and S-boxes

 

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

 

Constructor Summary

Blowfish()

 

Method Summary
protected  void	coreCrypt(byte[] in, int inOffset, byte[] out, int outOffset)           Encrypt or decrypt a single block of data.
protected  void	coreInit(java.security.Key key, boolean decrypt)           Initialize the object for encryption or decryption, given a Key.
private  void	keyEncrypt(int L, int R, int[] out, int outOff)           Perform a Blowfish encryption.

 

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

cP

private static final java.lang.String cP

Compressed initial values for the P-box and S-boxes

See Also:

Constant Field Values

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cS

private static final java.lang.String cS

Compressed initial values for the P-box and S-boxes

See Also:

Constant Field Values

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ROUNDS

private static final int ROUNDS

Self eplanatory constants

See Also:

Constant Field Values

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BLOCK_SIZE

private static final int BLOCK_SIZE

Self eplanatory constants

See Also:

Constant Field Values

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MIN_USER_KEY_LENGTH

private static final int MIN_USER_KEY_LENGTH

Self eplanatory constants

See Also:

Constant Field Values

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MAX_USER_KEY_LENGTH

private static final int MAX_USER_KEY_LENGTH

Self eplanatory constants

See Also:

Constant Field Values

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sP

private static final int[] sP

P-box and S-boxes

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sS

private static final int[] sS

P-box and S-boxes

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P

private final int[] P

P-box, used during key-setup

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K00

private int K00

Individual ints representing the session key taken from int[] P. We use these as a speedup instead of the P-array itself.

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K01

private int K01

Individual ints representing the session key taken from int[] P. We use these as a speedup instead of the P-array itself.

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K02

private int K02

Individual ints representing the session key taken from int[] P. We use these as a speedup instead of the P-array itself.

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K03

private int K03

Individual ints representing the session key taken from int[] P. We use these as a speedup instead of the P-array itself.

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K04

private int K04

Individual ints representing the session key taken from int[] P. We use these as a speedup instead of the P-array itself.

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K05

private int K05

Individual ints representing the session key taken from int[] P. We use these as a speedup instead of the P-array itself.

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K06

private int K06

Individual ints representing the session key taken from int[] P. We use these as a speedup instead of the P-array itself.

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K07

private int K07

Individual ints representing the session key taken from int[] P. We use these as a speedup instead of the P-array itself.

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K08

private int K08

Individual ints representing the session key taken from int[] P. We use these as a speedup instead of the P-array itself.

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K09

private int K09

Individual ints representing the session key taken from int[] P. We use these as a speedup instead of the P-array itself.

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K10

private int K10

Individual ints representing the session key taken from int[] P. We use these as a speedup instead of the P-array itself.

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K11

private int K11

Individual ints representing the session key taken from int[] P. We use these as a speedup instead of the P-array itself.

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K12

private int K12

Individual ints representing the session key taken from int[] P. We use these as a speedup instead of the P-array itself.

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K13

private int K13

Individual ints representing the session key taken from int[] P. We use these as a speedup instead of the P-array itself.

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K14

private int K14

Individual ints representing the session key taken from int[] P. We use these as a speedup instead of the P-array itself.

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K15

private int K15

Individual ints representing the session key taken from int[] P. We use these as a speedup instead of the P-array itself.

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K16

private int K16

Individual ints representing the session key taken from int[] P. We use these as a speedup instead of the P-array itself.

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K17

private int K17

Individual ints representing the session key taken from int[] P. We use these as a speedup instead of the P-array itself.

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S0

private final int[] S0

4 S-boxes

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S1

private final int[] S1

4 S-boxes

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S2

private final int[] S2

4 S-boxes

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S3

private final int[] S3

4 S-boxes

Constructor Detail

Blowfish

public Blowfish()

Method Detail

coreInit

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

Initialize the object for encryption or decryption, given a Key.

This method expects a key with algorithm 'Blowfish' and format 'RAW'. Both are case insensitive.

FIXME: checks need overhaul (or moved out to superclass).

Specified by:

coreInit in class BlockCipher

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coreCrypt

protected void coreCrypt(byte[] in,
                         int inOffset,
                         byte[] out,
                         int outOffset)

Encrypt or decrypt a single block of data.

Specified by:

coreCrypt in class BlockCipher

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keyEncrypt

private void keyEncrypt(int L,
                        int R,
                        int[] out,
                        int outOff)

Perform a Blowfish encryption. This method is only called by the makeKey method to generate the key schedule from user data. It outputs the result to an int array.

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Overview  Package   Class  Use  Deprecated  Index
Home >> All >> cryptix >> jce >> provider >> [ cipher overview ]	PREV CLASS  NEXT CLASS
SUMMARY:  JAVADOC |  SOURCE |  DOWNLOAD | NESTED | FIELD | CONSTR | METHOD	DETAIL: FIELD | CONSTR | METHOD

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