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SecureRandomSpi.java
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74 lines (67 loc) · 1.78 KB
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/*
* Copyright (c) 1998, 2013, Oracle and/or its affiliates. All rights reserved.
* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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package java.security;
/**
* This class defines the <i>Service Provider Interface</i> (<b>SPI</b>)
* for the {@code 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 SecureRandom
* @since 1.2
*/
public abstract class SecureRandomSpi implements java.io.Serializable {
private static final long serialVersionUID = -2991854161009191830L;
/**
* 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.
*
* <p> If a call to {@code 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
* {@code engineSetSeed} was previously called.
*
* @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);
}