1 /* 2 * Licensed to the Apache Software Foundation (ASF) under one or more 3 * contributor license agreements. See the NOTICE file distributed with 4 * this work for additional information regarding copyright ownership. 5 * The ASF licenses this file to You under the Apache License, Version 2.0 6 * (the "License"); you may not use this file except in compliance with 7 * the License. You may obtain a copy of the License at 8 * 9 * http://www.apache.org/licenses/LICENSE-2.0 10 * 11 * Unless required by applicable law or agreed to in writing, software 12 * distributed under the License is distributed on an "AS IS" BASIS, 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 * See the License for the specific language governing permissions and 15 * limitations under the License. 16 */ 17 18 package javax.crypto.spec; 19 20 import java.math.BigInteger; 21 import java.security.spec.AlgorithmParameterSpec; 22 23 /** 24 * The algorithm parameter specification for the Diffie-Hellman algorithm. 25 */ 26 public class DHParameterSpec implements AlgorithmParameterSpec { 27 28 private final BigInteger p; 29 private final BigInteger g; 30 private final int l; 31 32 /** 33 * Creates a new <code>DHParameterSpec</code> instance with the specified 34 * <i>prime modulus</i> and <i>base generator</i>. 35 * 36 * @param p 37 * the prime modulus. 38 * @param g 39 * the base generator. 40 */ 41 public DHParameterSpec(BigInteger p, BigInteger g) { 42 this.p = p; 43 this.g = g; 44 this.l = 0; 45 } 46 47 /** 48 * Creates a new <code>DHParameterSpec</code> instance with the specified 49 * <i>prime modulus</i>, <i>base generator</i> and size (in bits) of the 50 * <i>random exponent</i>. 51 * 52 * @param p 53 * the prime modulus. 54 * @param g 55 * the base generator. 56 * @param l 57 * the size of the random exponent (in bits). 58 */ 59 public DHParameterSpec(BigInteger p, BigInteger g, int l) { 60 this.p = p; 61 this.g = g; 62 this.l = l; 63 } 64 65 /** 66 * Returns the <i>prime modulus</i> of this parameter specification. 67 * 68 * @return the prime modulus. 69 */ 70 public BigInteger getP() { 71 return p; 72 } 73 74 /** 75 * Returns the <i>base generator</i> of this parameter specification. 76 * 77 * @return the base generator. 78 */ 79 public BigInteger getG() { 80 return g; 81 } 82 83 /** 84 * Returns the size (in bits) of the <i>random exponent</i>. 85 * 86 * @return the size (in bits) of the random exponent. 87 */ 88 public int getL() { 89 return l; 90 } 91 } 92 93
