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