124 lines
4.0 KiB
Java
124 lines
4.0 KiB
Java
/*
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* Copyright (c) 1997, 2007, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package javax.crypto.spec;
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import java.math.BigInteger;
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import java.security.spec.AlgorithmParameterSpec;
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/**
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* This class specifies the set of parameters used with the Diffie-Hellman
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* algorithm, as specified in PKCS #3: <i>Diffie-Hellman Key-Agreement
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* Standard</i>.
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*
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* <p>A central authority generates parameters and gives them to the two
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* entities seeking to generate a secret key. The parameters are a prime
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* <code>p</code>, a base <code>g</code>, and optionally the length
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* in bits of the private value, <code>l</code>.
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*
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* <p>It is possible that more than one instance of parameters may be
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* generated by a given central authority, and that there may be more than
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* one central authority. Indeed, each individual may be its own central
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* authority, with different entities having different parameters.
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*
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* <p>Note that this class does not perform any validation on specified
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* parameters. Thus, the specified values are returned directly even
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* if they are null.
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*
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* @author Jan Luehe
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*
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* @see javax.crypto.KeyAgreement
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* @since 1.4
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*/
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public class DHParameterSpec implements AlgorithmParameterSpec {
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// The prime modulus
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private BigInteger p;
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// The base generator
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private BigInteger g;
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// The size in bits of the random exponent (private value) (optional)
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private int l;
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/**
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* Constructs a parameter set for Diffie-Hellman, using a prime modulus
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* <code>p</code> and a base generator <code>g</code>.
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*
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* @param p the prime modulus
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* @param g the base generator
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*/
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public DHParameterSpec(BigInteger p, BigInteger g) {
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this.p = p;
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this.g = g;
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this.l = 0;
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}
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/**
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* Constructs a parameter set for Diffie-Hellman, using a prime modulus
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* <code>p</code>, a base generator <code>g</code>,
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* and the size in bits, <code>l</code>, of the random exponent
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* (private value).
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*
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* @param p the prime modulus
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* @param g the base generator
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* @param l the size in bits of the random exponent (private value)
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*/
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public DHParameterSpec(BigInteger p, BigInteger g, int l) {
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this.p = p;
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this.g = g;
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this.l = l;
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}
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/**
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* Returns the prime modulus <code>p</code>.
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*
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* @return the prime modulus <code>p</code>
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*/
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public BigInteger getP() {
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return this.p;
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}
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/**
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* Returns the base generator <code>g</code>.
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*
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* @return the base generator <code>g</code>
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*/
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public BigInteger getG() {
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return this.g;
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}
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/**
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* Returns the size in bits, <code>l</code>, of the random exponent
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* (private value).
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*
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* @return the size in bits, <code>l</code>, of the random exponent
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* (private value), or 0 if this size has not been set
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*/
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public int getL() {
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return this.l;
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}
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}
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