SecureRandomSpi

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.

See Also

• SecureRandom

Public Constructor Summary

SecureRandomSpi()

Protected Method Summary

abstract byte[]	engineGenerateSeed(int numBytes) Returns the given number of seed bytes.
abstract void	engineNextBytes(byte[] bytes) Generates a user-specified number of random bytes.
abstract void	engineSetSeed(byte[] seed) Reseeds this random object.

Inherited Method Summary

From class java.lang.Object

Object	clone() Creates and returns a copy of this Object.
boolean	equals(Object obj) Compares this instance with the specified object and indicates if they are equal.
void	finalize() Invoked when the garbage collector has detected that this instance is no longer reachable.
final Class<?>	getClass() Returns the unique instance of Class that represents this object's class.
int	hashCode() Returns an integer hash code for this object.
final void	notify() Causes a thread which is waiting on this object's monitor (by means of calling one of the wait() methods) to be woken up.
final void	notifyAll() Causes all threads which are waiting on this object's monitor (by means of calling one of the wait() methods) to be woken up.
String	toString() Returns a string containing a concise, human-readable description of this object.
final void	wait(long timeout, int nanos) Causes the calling thread to wait until another thread calls the notify() or notifyAll() method of this object or until the specified timeout expires.
final void	wait(long timeout) Causes the calling thread to wait until another thread calls the notify() or notifyAll() method of this object or until the specified timeout expires.
final void	wait() Causes the calling thread to wait until another thread calls the notify() or notifyAll() method of this object.

Public Constructors

public SecureRandomSpi ()

Protected Methods

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.

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.

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.