iaik.security.cipher
Class TwofishKeyGenerator

java.lang.Object
  |
  +--javax.crypto.KeyGeneratorSpi
        |
        +--iaik.security.cipher.VarLengthKeyGenerator
              |
              +--iaik.security.cipher.TwofishKeyGenerator

public class TwofishKeyGenerator

extends iaik.security.cipher.VarLengthKeyGenerator

This class provides the functionality of KeyGenerator for generating keys to be used by the Twofish cipher.

An application uses

 KeyGenerator key_gen = KeyGenerator.getInstance("Twofish");
 

for creating a KeyGenerator object for the Twofish algorithm. For actually generating the requested secret key from the KeyGenerator object just created, an application calls the generateKey method after having initialized the generator with some random seed or relied on the default system-provided source of randomness:

 SecretKey new_key = key_gen.generateKey();
 

Version:

File Revision 8

See Also:

KeyGenerator, KeyGeneratorSpi, SecretKey, SecretKey, Twofish

Constructor Summary

TwofishKeyGenerator()
Creates a new Twofish key generator.

Method Summary

protected SecretKey	engineGenerateKey() Generates a new key.
protected void	engineInit(AlgorithmParameterSpec params, SecureRandom random) Initializes this key generator.
protected void	engineInit(int strength, SecureRandom random) Initializes this key generator for the given strength with the given random seed.
protected void	engineInit(SecureRandom random) Initializes this key generator with the given random seed.

Methods inherited from class java.lang.Object

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

Constructor Detail

TwofishKeyGenerator

public TwofishKeyGenerator()

Creates a new Twofish key generator. The name for the generated key is Twofish, length is either 128, 192, or 256 bit.

Method Detail

engineInit

protected void engineInit(AlgorithmParameterSpec params,
                          SecureRandom random)
                   throws InvalidAlgorithmParameterException

Initializes this key generator. If params is not null, otherwise this call is identical to engineInit(random).

Overrides:

engineInit in class KeyGeneratorSpi

Throws:

InvalidAlgorithmParameterException - if parameters are passed

engineInit

protected void engineInit(int strength,
                          SecureRandom random)

Initializes this key generator for the given strength with the given random seed. Lengths outside the range of minimum to maximum length default to the default length.

Overrides:

engineInit in class KeyGeneratorSpi

Parameters:

strength - the strength of the key to be created

random - the random seed

engineInit

protected void engineInit(SecureRandom random)

Initializes this key generator with the given random seed. The strength defaults to the default length.

Overrides:

engineInit in class KeyGeneratorSpi

Parameters:

random - the random seed for this generator

engineGenerateKey

protected SecretKey engineGenerateKey()

Generates a new key.

Overrides:

engineGenerateKey in class KeyGeneratorSpi

Returns:

the created key

See Also:

SecretKey