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107 lines
3.1 KiB
107 lines
3.1 KiB
/*
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* Copyright (c) 1997, 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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import java.security.spec.AlgorithmParameterSpec;
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/**
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* <p> This class defines the <i>Service Provider Interface</i> (<b>SPI</b>)
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* for the {@code KeyPairGenerator} class, which is used to generate
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* pairs of public and private keys.
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*
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* <p> All the abstract methods in this class must be implemented by each
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* cryptographic service provider who wishes to supply the implementation
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* of a key pair generator for a particular algorithm.
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*
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* <p> In case the client does not explicitly initialize the KeyPairGenerator
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* (via a call to an {@code initialize} method), each provider must
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* supply (and document) a default initialization.
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* For example, the <i>Sun</i> provider uses a default modulus size (keysize)
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* of 1024 bits.
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*
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* @author Benjamin Renaud
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*
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*
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* @see KeyPairGenerator
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* @see java.security.spec.AlgorithmParameterSpec
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*/
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public abstract class KeyPairGeneratorSpi {
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/**
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* Initializes the key pair generator for a certain keysize, using
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* the default parameter set.
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*
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* @param keysize the keysize. This is an
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* algorithm-specific metric, such as modulus length, specified in
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* number of bits.
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*
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* @param random the source of randomness for this generator.
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*
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* @exception InvalidParameterException if the {@code keysize} is not
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* supported by this KeyPairGeneratorSpi object.
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*/
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public abstract void initialize(int keysize, SecureRandom random);
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/**
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* Initializes the key pair generator using the specified parameter
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* set and user-provided source of randomness.
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*
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* <p>This concrete method has been added to this previously-defined
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* abstract class. (For backwards compatibility, it cannot be abstract.)
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* It may be overridden by a provider to initialize the key pair
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* generator. Such an override
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* is expected to throw an InvalidAlgorithmParameterException if
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* a parameter is inappropriate for this key pair generator.
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* If this method is not overridden, it always throws an
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* UnsupportedOperationException.
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*
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* @param params the parameter set used to generate the keys.
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*
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* @param random the source of randomness for this generator.
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*
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* @exception InvalidAlgorithmParameterException if the given parameters
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* are inappropriate for this key pair generator.
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*
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* @since 1.2
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*/
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public void initialize(AlgorithmParameterSpec params,
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SecureRandom random)
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throws InvalidAlgorithmParameterException {
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throw new UnsupportedOperationException();
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}
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/**
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* Generates a key pair. Unless an initialization method is called
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* using a KeyPairGenerator interface, algorithm-specific defaults
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* will be used. This will generate a new key pair every time it
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* is called.
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*
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* @return the newly generated {@code KeyPair}
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*/
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public abstract KeyPair generateKeyPair();
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}
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