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118 lines
3.9 KiB
118 lines
3.9 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.interfaces;
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import java.security.*;
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/**
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* An interface to an object capable of generating DSA key pairs.
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*
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* <p>The {@code initialize} methods may each be called any number
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* of times. If no {@code initialize} method is called on a
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* DSAKeyPairGenerator, the default is to generate 1024-bit keys, using
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* precomputed p, q and g parameters and an instance of SecureRandom as
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* the random bit source.
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*
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* <p>Users wishing to indicate DSA-specific parameters, and to generate a key
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* pair suitable for use with the DSA algorithm typically
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*
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* <ol>
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*
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* <li>Get a key pair generator for the DSA algorithm by calling the
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* KeyPairGenerator {@code getInstance} method with "DSA"
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* as its argument.
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*
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* <li>Initialize the generator by casting the result to a DSAKeyPairGenerator
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* and calling one of the
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* {@code initialize} methods from this DSAKeyPairGenerator interface.
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*
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* <li>Generate a key pair by calling the {@code generateKeyPair}
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* method from the KeyPairGenerator class.
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*
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* </ol>
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*
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* <p>Note: it is not always necessary to do do algorithm-specific
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* initialization for a DSA key pair generator. That is, it is not always
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* necessary to call an {@code initialize} method in this interface.
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* Algorithm-independent initialization using the {@code initialize} method
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* in the KeyPairGenerator
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* interface is all that is needed when you accept defaults for algorithm-specific
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* parameters.
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*
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* <p>Note: Some earlier implementations of this interface may not support
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* larger sizes of DSA parameters such as 2048 and 3072-bit.
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*
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* @see java.security.KeyPairGenerator
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*/
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public interface DSAKeyPairGenerator {
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/**
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* Initializes the key pair generator using the DSA family parameters
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* (p,q and g) and an optional SecureRandom bit source. If a
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* SecureRandom bit source is needed but not supplied, i.e. null, a
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* default SecureRandom instance will be used.
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*
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* @param params the parameters to use to generate the keys.
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*
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* @param random the random bit source to use to generate key bits;
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* can be null.
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*
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* @exception InvalidParameterException if the {@code params}
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* value is invalid, null, or unsupported.
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*/
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public void initialize(DSAParams params, SecureRandom random)
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throws InvalidParameterException;
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/**
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* Initializes the key pair generator for a given modulus length
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* (instead of parameters), and an optional SecureRandom bit source.
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* If a SecureRandom bit source is needed but not supplied, i.e.
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* null, a default SecureRandom instance will be used.
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*
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* <p>If {@code genParams} is true, this method generates new
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* p, q and g parameters. If it is false, the method uses precomputed
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* parameters for the modulus length requested. If there are no
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* precomputed parameters for that modulus length, an exception will be
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* thrown. It is guaranteed that there will always be
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* default parameters for modulus lengths of 512 and 1024 bits.
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*
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* @param modlen the modulus length in bits. Valid values are any
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* multiple of 64 between 512 and 1024, inclusive, 2048, and 3072.
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*
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* @param random the random bit source to use to generate key bits;
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* can be null.
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*
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* @param genParams whether or not to generate new parameters for
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* the modulus length requested.
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*
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* @exception InvalidParameterException if {@code modlen} is
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* invalid, or unsupported, or if {@code genParams} is false and there
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* are no precomputed parameters for the requested modulus length.
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*/
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public void initialize(int modlen, boolean genParams, SecureRandom random)
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throws InvalidParameterException;
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}
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