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1: /* GnuDHPublicKey.java -- A Diffie-Hellman public key. 2: Copyright (C) 2004 Free Software Foundation, Inc. 3: 4: This file is part of GNU Classpath. 5: 6: GNU Classpath is free software; you can redistribute it and/or modify 7: it under the terms of the GNU General Public License as published by 8: the Free Software Foundation; either version 2, or (at your option) 9: any later version. 10: 11: GNU Classpath is distributed in the hope that it will be useful, but 12: WITHOUT ANY WARRANTY; without even the implied warranty of 13: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14: General Public License for more details. 15: 16: You should have received a copy of the GNU General Public License 17: along with GNU Classpath; see the file COPYING. If not, write to the 18: Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 19: 02110-1301 USA. 20: 21: Linking this library statically or dynamically with other modules is 22: making a combined work based on this library. Thus, the terms and 23: conditions of the GNU General Public License cover the whole 24: combination. 25: 26: As a special exception, the copyright holders of this library give you 27: permission to link this library with independent modules to produce an 28: executable, regardless of the license terms of these independent 29: modules, and to copy and distribute the resulting executable under 30: terms of your choice, provided that you also meet, for each linked 31: independent module, the terms and conditions of the license of that 32: module. An independent module is a module which is not derived from 33: or based on this library. If you modify this library, you may extend 34: this exception to your version of the library, but you are not 35: obligated to do so. If you do not wish to do so, delete this 36: exception statement from your version. */ 37: 38: 39: package gnu.java.security.provider; 40: 41: import gnu.java.security.OID; 42: import gnu.java.security.der.BitString; 43: import gnu.java.security.der.DER; 44: import gnu.java.security.der.DERValue; 45: 46: import java.math.BigInteger; 47: import java.util.ArrayList; 48: 49: import javax.crypto.interfaces.DHPublicKey; 50: import javax.crypto.spec.DHParameterSpec; 51: 52: public class GnuDHPublicKey implements DHPublicKey 53: { 54: 55: // Fields. 56: // ------------------------------------------------------------------------- 57: 58: private byte[] encoded; 59: private final DHParameterSpec params; 60: private final BigInteger Y; 61: private final BigInteger q; 62: 63: // Constructor. 64: // ------------------------------------------------------------------------- 65: 66: public GnuDHPublicKey(DHParameterSpec params, BigInteger Y, BigInteger q) 67: { 68: this.params = params; 69: this.Y = Y; 70: this.q = q; 71: } 72: 73: // Instance methods. 74: // ------------------------------------------------------------------------- 75: 76: public BigInteger getY() 77: { 78: return Y; 79: } 80: 81: public DHParameterSpec getParams() 82: { 83: return params; 84: } 85: 86: public String getAlgorithm() 87: { 88: return "DH"; 89: } 90: 91: public String getFormat() 92: { 93: return "X.509"; 94: } 95: 96: public byte[] getEncoded() 97: { 98: if (encoded != null) 99: return (byte[]) encoded.clone(); 100: ArrayList spki = new ArrayList(2); 101: ArrayList alg = new ArrayList(2); 102: alg.add(new DERValue(DER.OBJECT_IDENTIFIER, new OID("1.2.840.10046.2.1"))); 103: ArrayList param = new ArrayList(3); 104: param.add(new DERValue(DER.INTEGER, params.getP())); 105: param.add(new DERValue(DER.INTEGER, params.getG())); 106: param.add(new DERValue(DER.INTEGER, q)); 107: alg.add(new DERValue(DER.CONSTRUCTED|DER.SEQUENCE, param)); 108: spki.add(new DERValue(DER.CONSTRUCTED|DER.SEQUENCE, alg)); 109: spki.add(new DERValue(DER.BIT_STRING, new BitString(Y.toByteArray()))); 110: encoded = new DERValue(DER.CONSTRUCTED|DER.SEQUENCE, spki).getEncoded(); 111: if (encoded != null) 112: return (byte[]) encoded.clone(); 113: return null; 114: } 115: }