JavaTM 2 Platform
Std. Ed. v1.3.1
Class SecureRandomSpi

All Implemented Interfaces:

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, Serialized Form

Constructor Summary
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


public SecureRandomSpi()
Method Detail


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.
seed - the seed.


protected abstract void engineNextBytes(byte[] bytes)
Generates a user-specified number of random bytes.
bytes - the array to be filled in with random bytes.


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

JavaTM 2 Platform
Std. Ed. v1.3.1

Submit a bug or feature
For further API reference and developer documentation, see Java 2 SDK SE Developer Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.

Java, Java 2D, and JDBC are trademarks or registered trademarks of Oracle and/or its affiliates, in the US and other countries.
Copyright © 1995, 2010 Oracle and/or its affiliates. All rights reserved.