001 /**
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements. See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License. You may obtain a copy of the License at
008 *
009 * http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017
018 package org.apache.geronimo.util.jce.provider;
019
020 import java.io.ByteArrayOutputStream;
021 import java.io.IOException;
022 import java.math.BigInteger;
023 import java.security.interfaces.DSAParams;
024 import java.security.interfaces.DSAPublicKey;
025 import java.security.spec.DSAParameterSpec;
026 import java.security.spec.DSAPublicKeySpec;
027
028 import org.apache.geronimo.util.asn1.ASN1Sequence;
029 import org.apache.geronimo.util.asn1.DERInteger;
030 import org.apache.geronimo.util.asn1.DEROutputStream;
031 import org.apache.geronimo.util.asn1.x509.AlgorithmIdentifier;
032 import org.apache.geronimo.util.asn1.x509.DSAParameter;
033 import org.apache.geronimo.util.asn1.x509.SubjectPublicKeyInfo;
034 import org.apache.geronimo.util.asn1.x9.X9ObjectIdentifiers;
035 import org.apache.geronimo.util.crypto.params.DSAPublicKeyParameters;
036
037 public class JDKDSAPublicKey
038 implements DSAPublicKey
039 {
040 private BigInteger y;
041 private DSAParams dsaSpec;
042
043 JDKDSAPublicKey(
044 DSAPublicKeySpec spec)
045 {
046 this.y = spec.getY();
047 this.dsaSpec = new DSAParameterSpec(spec.getP(), spec.getQ(), spec.getG());
048 }
049
050 JDKDSAPublicKey(
051 DSAPublicKey key)
052 {
053 this.y = key.getY();
054 this.dsaSpec = key.getParams();
055 }
056
057 JDKDSAPublicKey(
058 DSAPublicKeyParameters params)
059 {
060 this.y = params.getY();
061 this.dsaSpec = new DSAParameterSpec(params.getParameters().getP(), params.getParameters().getQ(), params.getParameters().getG());
062 }
063
064 JDKDSAPublicKey(
065 BigInteger y,
066 DSAParameterSpec dsaSpec)
067 {
068 this.y = y;
069 this.dsaSpec = dsaSpec;
070 }
071
072 JDKDSAPublicKey(
073 SubjectPublicKeyInfo info)
074 {
075 DSAParameter params = new DSAParameter((ASN1Sequence)info.getAlgorithmId().getParameters());
076 DERInteger derY = null;
077
078 try
079 {
080 derY = (DERInteger)info.getPublicKey();
081 }
082 catch (IOException e)
083 {
084 throw new IllegalArgumentException("invalid info structure in DSA public key", e);
085 }
086
087 this.y = derY.getValue();
088 this.dsaSpec = new DSAParameterSpec(params.getP(), params.getQ(), params.getG());
089 }
090
091 public String getAlgorithm()
092 {
093 return "DSA";
094 }
095
096 public String getFormat()
097 {
098 return "X.509";
099 }
100
101 public byte[] getEncoded()
102 {
103 ByteArrayOutputStream bOut = new ByteArrayOutputStream();
104 DEROutputStream dOut = new DEROutputStream(bOut);
105 SubjectPublicKeyInfo info = new SubjectPublicKeyInfo(new AlgorithmIdentifier(X9ObjectIdentifiers.id_dsa, new DSAParameter(dsaSpec.getP(), dsaSpec.getQ(), dsaSpec.getG()).getDERObject()), new DERInteger(y));
106
107 try
108 {
109 dOut.writeObject(info);
110 dOut.close();
111 }
112 catch (IOException e)
113 {
114 throw new RuntimeException("Error encoding DSA public key", e);
115 }
116
117 return bOut.toByteArray();
118
119 }
120
121 public DSAParams getParams()
122 {
123 return dsaSpec;
124 }
125
126 public BigInteger getY()
127 {
128 return y;
129 }
130
131 public String toString()
132 {
133 StringBuffer buf = new StringBuffer();
134 String nl = System.getProperty("line.separator");
135
136 buf.append("DSA Public Key" + nl);
137 buf.append(" y: " + this.getY().toString(16) + nl);
138
139 return buf.toString();
140 }
141 }