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75 lines
1.8 KiB
75 lines
1.8 KiB
/*
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* Copyright (c) 1998, 2013, Oracle and/or its affiliates. All rights reserved.
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* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*/
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package java.security;
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/**
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* This class defines the <i>Service Provider Interface</i> (<b>SPI</b>)
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* for the {@code SecureRandom} class.
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* All the abstract methods in this class must be implemented by each
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* service provider who wishes to supply the implementation
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* of a cryptographically strong pseudo-random number generator.
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*
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*
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* @see SecureRandom
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* @since 1.2
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*/
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public abstract class SecureRandomSpi implements java.io.Serializable {
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private static final long serialVersionUID = -2991854161009191830L;
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/**
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* Reseeds this random object. The given seed supplements, rather than
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* replaces, the existing seed. Thus, repeated calls are guaranteed
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* never to reduce randomness.
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*
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* @param seed the seed.
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*/
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protected abstract void engineSetSeed(byte[] seed);
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/**
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* Generates a user-specified number of random bytes.
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*
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* <p> If a call to {@code engineSetSeed} had not occurred previously,
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* the first call to this method forces this SecureRandom implementation
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* to seed itself. This self-seeding will not occur if
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* {@code engineSetSeed} was previously called.
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*
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* @param bytes the array to be filled in with random bytes.
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*/
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protected abstract void engineNextBytes(byte[] bytes);
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/**
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* Returns the given number of seed bytes. This call may be used to
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* seed other random number generators.
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*
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* @param numBytes the number of seed bytes to generate.
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*
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* @return the seed bytes.
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*/
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protected abstract byte[] engineGenerateSeed(int numBytes);
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}
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