javax.crypto
Class KeyGeneratorSpi

java.lang.Object
  |
  +--javax.crypto.KeyGeneratorSpi
Direct Known Subclasses:
BlowfishKeyGenerator, DESKeyGenerator, IDEAKeyGenerator, RC4KeyGenerator, TwofishKeyGenerator

public abstract class KeyGeneratorSpi
extends java.lang.Object

This class defines the Service Provider Interface (SPI) for the KeyGenerator class. All the abstract methods in this class must be implemented by each cryptographic service provider who wishes to supply the implementation of a key generator for a particular algorithm.

See Also:
SecretKey

Field Summary
static java.lang.String ident
           
 
Constructor Summary
KeyGeneratorSpi()
          Creates a KeyGeneratorSpi object.
 
Method Summary
protected abstract  SecretKey engineGenerateKey()
          Generates a secret key.
protected abstract  void engineInit(java.security.spec.AlgorithmParameterSpec params, java.security.SecureRandom random)
          Initialises the key generator with the specified parameter set and a user-provided source of randomness.
protected abstract  void engineInit(int strength, java.security.SecureRandom random)
          Initialises this key generator for a certain strength, using the given source of randomness.
protected abstract  void engineInit(java.security.SecureRandom random)
          Initialises the key generator.
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Field Detail

ident

public static final java.lang.String ident
Constructor Detail

KeyGeneratorSpi

public KeyGeneratorSpi()
Creates a KeyGeneratorSpi object.
Method Detail

engineInit

protected abstract void engineInit(java.security.SecureRandom random)
Initialises the key generator.
Parameters:
random - the source of randomness for this generator.

engineInit

protected abstract void engineInit(java.security.spec.AlgorithmParameterSpec params,
                                   java.security.SecureRandom random)
                            throws java.security.InvalidAlgorithmParameterException
Initialises the key generator with the specified parameter set and a user-provided source of randomness.
Parameters:
params - the key generation parameters
random - the source of randomness for this key generator
Throws:
java.security.InvalidAlgorithmParameterException - if params is inappropriate for this key generator.

engineInit

protected abstract void engineInit(int strength,
                                   java.security.SecureRandom random)
Initialises this key generator for a certain strength, using the given source of randomness.
Parameters:
strength - the strength of the key. This is an algorithm-specific metric specified in number of bits.
random - the source of randomness for this key generator

engineGenerateKey

protected abstract SecretKey engineGenerateKey()
Generates a secret key.
Returns:
the new key