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

---

cryptix.jce.provider.key
Class RC4KeyGenerator  

java.lang.Object
  javax.crypto.KeyGeneratorSpi
      cryptix.jce.provider.key.RawKeyGenerator
          cryptix.jce.provider.key.RC4KeyGenerator

---

public class RC4KeyGenerator

extends RawKeyGenerator

A key generator for RC4.

Key length between 40 and 1024 bits inclusive (increments of 8). Default length is 128 bits.

References:

• Andrew Roos <andrewr@vironix.co.za> (Vironix Software Laboratories), A Class of Weak Keys in the RC4 Stream Cipher, Preliminary draft posted to sci.crypt, 4th November 1997.

Version:

$Revision: 1.6 $

---

Constructor Summary

RC4KeyGenerator()

 

Method Summary
protected  javax.crypto.SecretKey	engineGenerateKey()           Generate a key, returning it as a javax.crypto.SecretKey.
protected  void	engineInit(java.security.spec.AlgorithmParameterSpec params, java.security.SecureRandom random)           Initialize this key generator with parameters and a source of randomness.
protected  void	engineInit(int keysize, java.security.SecureRandom random)           Initialize this key generator with a key size (in bits) and a source of randomness.
protected  void	engineInit(java.security.SecureRandom random)           Initialize this key generator with a source of randomness; the implementation should use reasonable default parameters (such as generated key size).
protected  byte[]	fixUp(byte[] key)           Fix up the generated and purely random bytes.
protected  boolean	isValidSize(int size)           40 <= size <= 1024
protected  boolean	isWeak(byte[] key)           Returns true iff key is a weak RC4 key, as described in Andrew Roos' paper.
protected  int	strengthToBits(int strength)           Translates strength (complexity, 56 for DES) to bit length (64 for DES).

 

Methods inherited from class java.lang.Object

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

 

Constructor Detail

RC4KeyGenerator

public RC4KeyGenerator()

Method Detail

isWeak

protected boolean isWeak(byte[] key)

Returns true iff key is a weak RC4 key, as described in Andrew Roos' paper.

Specified by:

isWeak in class RawKeyGenerator

---

isValidSize

protected boolean isValidSize(int size)

40 <= size <= 1024

Specified by:

isValidSize in class RawKeyGenerator

---

engineInit

protected void engineInit(java.security.SecureRandom random)

Description copied from class: javax.crypto.KeyGeneratorSpi

Initialize this key generator with a source of randomness; the implementation should use reasonable default parameters (such as generated key size).

---

engineInit

protected void engineInit(java.security.spec.AlgorithmParameterSpec params,
                          java.security.SecureRandom random)
                   throws java.security.InvalidAlgorithmParameterException

Description copied from class: javax.crypto.KeyGeneratorSpi

Initialize this key generator with parameters and a source of randomness.

---

engineInit

protected void engineInit(int keysize,
                          java.security.SecureRandom random)

Description copied from class: javax.crypto.KeyGeneratorSpi

Initialize this key generator with a key size (in bits) and a source of randomness.

---

engineGenerateKey

protected javax.crypto.SecretKey engineGenerateKey()

Description copied from class: javax.crypto.KeyGeneratorSpi

Generate a key, returning it as a javax.crypto.SecretKey.

---

strengthToBits

protected int strengthToBits(int strength)

Translates strength (complexity, 56 for DES) to bit length (64 for DES).

---

fixUp

protected byte[] fixUp(byte[] key)

Fix up the generated and purely random bytes. For DES this would fix the parity.

---

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

---