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java.security
Class SecureRandomSpi


java.lang.Object
  extended by java.security.SecureRandomSpi
All Implemented Interfaces:
Serializable 
public abstract class SecureRandomSpi
extends Object
implements Serializable

This class defines the Service Provider Interface ( SPI ) for the SecureRandom class. All the abstract methods in this class must be implemented by each service provider who wishes to supply the implementation of a cryptographically strong pseudo-random number generator.

Since:
1.2
See Also:
SecureRandom , Serialized Form

Constructor Summary
SecureRandomSpi ()
           
 
Method Summary
protected abstract  byte[] engineGenerateSeed (int numBytes)
          Returns the given number of seed bytes.
protected abstract  void engineNextBytes (byte[] bytes)
          Generates a user-specified number of random bytes.
protected abstract  void engineSetSeed (byte[] seed)
          Reseeds this random object.
 
Methods inherited from class java.lang. Object
clone , equals , finalize , getClass , hashCode , notify , notifyAll , toString , wait , wait , wait
 

Constructor Detail

SecureRandomSpi


public SecureRandomSpi()
Method Detail

engineSetSeed


protected abstract void engineSetSeed(byte[] seed)
Reseeds this random object. The given seed supplements, rather than replaces, the existing seed. Thus, repeated calls are guaranteed never to reduce randomness.

Parameters:
seed - the seed.

engineNextBytes


protected abstract void engineNextBytes(byte[] bytes)
Generates a user-specified number of random bytes.

If a call to engineSetSeed had not occurred previously, the first call to this method forces this SecureRandom implementation to seed itself. This self-seeding will not occur if engineSetSeed was previously called.

Parameters:
bytes - the array to be filled in with random bytes.

engineGenerateSeed


protected abstract byte[] engineGenerateSeed(int numBytes)
Returns the given number of seed bytes. This call may be used to seed other random number generators.

Parameters:
numBytes - the number of seed bytes to generate.
Returns:
the seed bytes.