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1: /* GnuDSAPrivateKey.java --- Gnu DSA Private Key 2: Copyright (C) 1999,2003,2004 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.DER; 43: import gnu.java.security.der.DERValue; 44: import gnu.java.security.der.DERWriter; 45: 46: import java.io.ByteArrayOutputStream; 47: import java.io.IOException; 48: import java.math.BigInteger; 49: import java.security.interfaces.DSAParams; 50: import java.security.interfaces.DSAPrivateKey; 51: import java.security.spec.DSAParameterSpec; 52: import java.util.ArrayList; 53: 54: public class GnuDSAPrivateKey implements DSAPrivateKey 55: { 56: private byte[] encodedKey; 57: BigInteger x; 58: BigInteger p; 59: BigInteger q; 60: BigInteger g; 61: 62: public GnuDSAPrivateKey(BigInteger x, BigInteger p, BigInteger q, BigInteger g ) 63: { 64: this.x = x; 65: this.p = p; 66: this.q = q; 67: this.g = g; 68: } 69: 70: public String getAlgorithm() 71: { 72: return "DSA"; 73: } 74: 75: public String getFormat() 76: { 77: return "PKCS#8"; 78: } 79: 80: /** 81: * Encodes this key as a <code>PrivateKeyInfo</code>, as described in 82: * PKCS #8. The ASN.1 specification for this structure is: 83: * 84: * <blockquote><pre> 85: * PrivateKeyInfo ::= SEQUENCE { 86: * version Version, 87: * privateKeyAlgorithm PrivateKeyAlgorithmIdentifier, 88: * privateKey PrivateKey, 89: * attributes [0] IMPLICIT Attributes OPTIONAL } 90: * 91: * Version ::= INTEGER 92: * 93: * PrivateKeyAlgorithmIdentifier ::= AlgorithmIdentifier 94: * 95: * PrivateKey ::= OCTET STRING 96: * 97: * Attributes ::= SET OF Attribute 98: * </pre></blockquote> 99: * 100: * <p>DSA private keys (in Classpath at least) have no attributes. 101: */ 102: public byte[] getEncoded() 103: { 104: if (encodedKey != null) 105: return (byte[]) encodedKey.clone(); 106: try 107: { 108: ByteArrayOutputStream out = new ByteArrayOutputStream(); 109: ArrayList pki = new ArrayList(3); 110: pki.add(new DERValue(DER.INTEGER, BigInteger.ZERO)); 111: ArrayList algId = new ArrayList(2); 112: algId.add(new DERValue(DER.OBJECT_IDENTIFIER, 113: new OID("1.2.840.10040.4.1"))); 114: ArrayList algParams = new ArrayList(3); 115: algParams.add(new DERValue(DER.INTEGER, p)); 116: algParams.add(new DERValue(DER.INTEGER, q)); 117: algParams.add(new DERValue(DER.INTEGER, g)); 118: algId.add(new DERValue(DER.CONSTRUCTED|DER.SEQUENCE, algParams)); 119: pki.add(new DERValue(DER.OCTET_STRING, x.toByteArray())); 120: DERWriter.write(out, new DERValue(DER.CONSTRUCTED|DER.SEQUENCE, pki)); 121: return (byte[]) (encodedKey = out.toByteArray()).clone(); 122: } 123: catch (IOException ioe) 124: { 125: return null; 126: } 127: } 128: 129: public DSAParams getParams() 130: { 131: return (DSAParams)(new DSAParameterSpec(p,q,g)); 132: } 133: 134: public BigInteger getX() 135: { 136: return x; 137: } 138: 139: public String toString() 140: { 141: return "GnuDSAPrivateKey: x=" 142: + (x != null ? x.toString(16) : "null") + " p=" 143: + (p != null ? p.toString(16) : "null") + " q=" 144: + (q != null ? q.toString(16) : "null") + " g=" 145: + (g != null ? g.toString(16) : "null"); 146: } 147: }