| /* DHParameterSpec.java -- Parameters for Diffie-Hellman keys. |
| Copyright (C) 2004 Free Software Foundation, Inc. |
| |
| This file is part of GNU Classpath. |
| |
| GNU Classpath is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 2, or (at your option) |
| any later version. |
| |
| GNU Classpath 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 for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with GNU Classpath; see the file COPYING. If not, write to the |
| Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
| 02110-1301 USA. |
| |
| Linking this library statically or dynamically with other modules is |
| making a combined work based on this library. Thus, the terms and |
| conditions of the GNU General Public License cover the whole |
| combination. |
| |
| As a special exception, the copyright holders of this library give you |
| permission to link this library with independent modules to produce an |
| executable, regardless of the license terms of these independent |
| modules, and to copy and distribute the resulting executable under |
| terms of your choice, provided that you also meet, for each linked |
| independent module, the terms and conditions of the license of that |
| module. An independent module is a module which is not derived from |
| or based on this library. If you modify this library, you may extend |
| this exception to your version of the library, but you are not |
| obligated to do so. If you do not wish to do so, delete this |
| exception statement from your version. */ |
| |
| |
| package javax.crypto.spec; |
| |
| import java.math.BigInteger; |
| import java.security.spec.AlgorithmParameterSpec; |
| |
| /** |
| * The base set of parameters necessary to perform Diffie-Hellman key |
| * exchange. Each party in the key exchange shares these parameters. |
| * |
| * <p>Each set of parameters consists of a <i>base generator</i> |
| * <code>g</code>, a <i>prime modulus</i> <code>p</code>, and an |
| * optional length, in bits, of the private exponent. |
| * |
| * <p>See <a href="http://www.rsasecurity.com/rsalabs/pkcs/pkcs-3/">PKCS |
| * #3 - Diffie-Hellman Key Agreement Standard</a> for more information. |
| * |
| * @author Casey Marshall (csm@gnu.org) |
| * @since 1.4 |
| * @see javax.crypto.KeyAgreement |
| */ |
| public class DHParameterSpec implements AlgorithmParameterSpec |
| { |
| |
| // Variables. |
| // ------------------------------------------------------------------------ |
| |
| /** The base generator g. */ |
| private BigInteger g; |
| |
| /** The prime modulus p. */ |
| private BigInteger p; |
| |
| /** The length, in bits, of the private exponent. */ |
| private int l; |
| |
| // Constructors. |
| // ------------------------------------------------------------------------ |
| |
| /** |
| * Create a new set of Diffie-Hellman parameters. |
| * |
| * @param p The prime modulus. |
| * @param g The base generator. |
| */ |
| public DHParameterSpec(BigInteger p, BigInteger g) |
| { |
| this(p, g, 0); |
| } |
| |
| /** |
| * Create a new set of Diffie-Hellman parameters. |
| * |
| * @param p The prime modulus. |
| * @param g The base generator. |
| * @param l The size of the private exponent, in bits. |
| */ |
| public DHParameterSpec(BigInteger p, BigInteger g, int l) |
| { |
| this.p = p; |
| this.g = g; |
| this.l = l; |
| } |
| |
| // Instance methods. |
| // ------------------------------------------------------------------------ |
| |
| /** |
| * Get the base generator, <i>g</i>. |
| * |
| * @return The base generator <i>g</i>. |
| */ |
| public BigInteger getG() |
| { |
| return g; |
| } |
| |
| /** |
| * Get the length of the private exponent, in bits. |
| * |
| * @return The length of the private exponent, in bits, or 0 if this |
| * has not been explicitly set. |
| */ |
| public int getL() |
| { |
| return l; |
| } |
| |
| /** |
| * Get the prime modulus, <i>p</i>. |
| * |
| * @return The prime modulus, <i>p</i>. |
| */ |
| public BigInteger getP() |
| { |
| return p; |
| } |
| } |