This abstract class defines the service-provider interface for SecureRandom. A security provider must implement a concrete subclass of this class for each pseudorandom number-generation algorithm it supports. Applications never need to use or subclass this class.

Figure 14-37. java.security.SecureRandomSpi

public abstract class SecureRandomSpi implements Serializable {
// Public Constructors
     public SecureRandomSpi( );  
// Protected Instance Methods
     protected abstract byte[ ] engineGenerateSeed(int numBytes);  
     protected abstract void engineNextBytes(byte[ ] bytes);  
     protected abstract void engineSetSeed(byte[ ] seed);  
}

Passed To

SecureRandom.SecureRandom( )