1/*
2 * Copyright (c) 1997, 2007, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.  Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26package javax.crypto.spec;
27
28import java.math.BigInteger;
29import java.security.spec.AlgorithmParameterSpec;
30
31/**
32 * This class specifies the set of parameters used for generating
33 * Diffie-Hellman (system) parameters for use in Diffie-Hellman key
34 * agreement. This is typically done by a central
35 * authority.
36 *
37 * <p> The central authority, after computing the parameters, must send this
38 * information to the parties looking to agree on a secret key.
39 *
40 * @author Jan Luehe
41 *
42 * @see DHParameterSpec
43 * @since 1.4
44 */
45public class DHGenParameterSpec implements AlgorithmParameterSpec {
46
47    // The size in bits of the prime modulus
48    private int primeSize;
49
50    // The size in bits of the random exponent (private value)
51    private int exponentSize;
52
53    /**
54     * Constructs a parameter set for the generation of Diffie-Hellman
55     * (system) parameters. The constructed parameter set can be used to
56     * initialize an
57     * {@link java.security.AlgorithmParameterGenerator AlgorithmParameterGenerator}
58     * object for the generation of Diffie-Hellman parameters.
59     *
60     * @param primeSize the size (in bits) of the prime modulus.
61     * @param exponentSize the size (in bits) of the random exponent.
62     */
63    public DHGenParameterSpec(int primeSize, int exponentSize) {
64        this.primeSize = primeSize;
65        this.exponentSize = exponentSize;
66    }
67
68    /**
69     * Returns the size in bits of the prime modulus.
70     *
71     * @return the size in bits of the prime modulus
72     */
73    public int getPrimeSize() {
74        return this.primeSize;
75    }
76
77    /**
78     * Returns the size in bits of the random exponent (private value).
79     *
80     * @return the size in bits of the random exponent (private value)
81     */
82    public int getExponentSize() {
83        return this.exponentSize;
84    }
85}
86