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

---

cryptix.jce.provider.cipher
Class Serpent  

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

---

public final class Serpent

extends BlockCipher

A bit-slice implementation in Java of the Serpent cipher.

Serpent is a 128-bit 32-round block cipher with variable key lengths, including 128-, 192- and 256-bit keys conjectured to be at least as secure as three-key triple-DES.

Serpent was designed by Ross Anderson, Eli Biham and Lars Knudsen as a candidate algorithm for the NIST AES Quest.

References:

1. Serpent: A New Block Cipher Proposal. This paper was published in the proceedings of the "Fast Software Encryption Workshop No. 5" held in Paris in March 1998. LNCS, Springer Verlag.

2. Reference implementation of the standard Serpent cipher written in C by Frank Stajano.

Version:

$Revision: 1.5 $

---

Field Summary
private static int	BLOCK_SIZE
private  boolean	decrypt
private  int[]	K
private static int	PHI
private static int	ROUNDS
private static byte[][]	Sbox           An array of 8 (number of rounds/4) S boxes.

 

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

 

Constructor Summary

Serpent()

 

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  void	generateSubKeys(byte[] key)           Expand a user-supplied key material into a session key.

 

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

---

PHI

private static final int PHI

See Also:

Constant Field Values

---

decrypt

private boolean decrypt

---

K

private int[] K

---

Sbox

private static final byte[][] Sbox

An array of 8 (number of rounds/4) S boxes.

An S box is an array of 16 distinct quantities, each in the range 0-15. A value v at position p for a given S box, implies that if this S box is given on input a value p, it will return the value v. Original S box data below. We use a more compact encoding that is expanded in a static initializer. { 3, 8,15, 1,10, 6, 5,11,14,13, 4, 2, 7, 0, 9,12 }, // S0 {15,12, 2, 7, 9, 0, 5,10, 1,11,14, 8, 6,13, 3, 4 }, // S1 { 8, 6, 7, 9, 3,12,10,15,13, 1,14, 4, 0,11, 5, 2 }, // S2 { 0,15,11, 8,12, 9, 6, 3,13, 1, 2, 4,10, 7, 5,14 }, // S3 { 1,15, 8, 3,12, 0,11, 6, 2, 5, 4,10, 9,14, 7,13 }, // S4 {15, 5, 2,11, 4,10, 9,12, 0, 3,14, 8,13, 6, 7, 1 }, // S5 { 7, 2,12, 5, 8, 4, 6,11,14, 9, 1,15,13, 3,10, 0 }, // S6 { 1,13,15, 0,14, 8, 2,11, 7, 4,12,10, 9, 3, 5, 6 } // S7

Constructor Detail

Serpent

public Serpent()

Method Detail

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

---

generateSubKeys

private final void generateSubKeys(byte[] key)

Expand a user-supplied key material into a session key.

---

blockEncrypt

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

Encrypt exactly one block of plaintext.

---

blockDecrypt

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

Decrypt exactly one block of ciphertext.

---

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

---