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 26 package javax.crypto.spec; 27 28 import java.math.BigInteger; 29 import 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 */ 45 public 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
