/*
* @(#)SecureRandomSpi.java 1.13 06/10/10
*
* Copyright 1990-2008 Sun Microsystems, Inc. All Rights Reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version
* 2 only, as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License version 2 for more details (a copy is
* included at /legal/license.txt).
*
* You should have received a copy of the GNU General Public License
* version 2 along with this work; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA
*
* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
* Clara, CA 95054 or visit www.sun.com if you need additional
* information or have any questions.
*
*/
package java.security;
/**
* This class defines the <i>Service Provider Interface</i> (<b>SPI</b>)
* for the <code>SecureRandom</code> 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.
*
* @version 1.7, 02/02/00
*
* @see SecureRandom
* @since 1.2
*/
public abstract class SecureRandomSpi implements java.io.Serializable {
/**
* Reseeds this random object. The given seed supplements, rather than
* replaces, the existing seed. Thus, repeated calls are guaranteed
* never to reduce randomness.
*
* @param seed the seed.
*/
protected abstract void engineSetSeed(byte[] seed);
/**
* Generates a user-specified number of random bytes.
*
* @param bytes the array to be filled in with random bytes.
*/
protected abstract void engineNextBytes(byte[] bytes);
/**
* Returns the given number of seed bytes. This call may be used to
* seed other random number generators.
*
* @param numBytes the number of seed bytes to generate.
*
* @return the seed bytes.
*/
protected abstract byte[] engineGenerateSeed(int numBytes);
}