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.RSAPublicKey;
024 import java.security.spec.RSAPublicKeySpec;
025
026 import org.apache.geronimo.util.asn1.ASN1Sequence;
027 import org.apache.geronimo.util.asn1.DERNull;
028 import org.apache.geronimo.util.asn1.DEROutputStream;
029 import org.apache.geronimo.util.asn1.pkcs.PKCSObjectIdentifiers;
030 import org.apache.geronimo.util.asn1.x509.AlgorithmIdentifier;
031 import org.apache.geronimo.util.asn1.x509.RSAPublicKeyStructure;
032 import org.apache.geronimo.util.asn1.x509.SubjectPublicKeyInfo;
033 import org.apache.geronimo.util.crypto.params.RSAKeyParameters;
034
035 public class JCERSAPublicKey
036 implements RSAPublicKey
037 {
038 private BigInteger modulus;
039 private BigInteger publicExponent;
040
041 JCERSAPublicKey(
042 RSAKeyParameters key)
043 {
044 this.modulus = key.getModulus();
045 this.publicExponent = key.getExponent();
046 }
047
048 JCERSAPublicKey(
049 RSAPublicKeySpec spec)
050 {
051 this.modulus = spec.getModulus();
052 this.publicExponent = spec.getPublicExponent();
053 }
054
055 JCERSAPublicKey(
056 RSAPublicKey key)
057 {
058 this.modulus = key.getModulus();
059 this.publicExponent = key.getPublicExponent();
060 }
061
062 JCERSAPublicKey(
063 SubjectPublicKeyInfo info)
064 {
065 try
066 {
067 RSAPublicKeyStructure pubKey = new RSAPublicKeyStructure((ASN1Sequence)info.getPublicKey());
068
069 this.modulus = pubKey.getModulus();
070 this.publicExponent = pubKey.getPublicExponent();
071 }
072 catch (IOException e)
073 {
074 throw new IllegalArgumentException("invalid info structure in RSA public key", e);
075 }
076 }
077
078 /**
079 * return the modulus.
080 *
081 * @return the modulus.
082 */
083 public BigInteger getModulus()
084 {
085 return modulus;
086 }
087
088 /**
089 * return the public exponent.
090 *
091 * @return the public exponent.
092 */
093 public BigInteger getPublicExponent()
094 {
095 return publicExponent;
096 }
097
098 public String getAlgorithm()
099 {
100 return "RSA";
101 }
102
103 public String getFormat()
104 {
105 return "X.509";
106 }
107
108 public byte[] getEncoded()
109 {
110 ByteArrayOutputStream bOut = new ByteArrayOutputStream();
111 DEROutputStream dOut = new DEROutputStream(bOut);
112 SubjectPublicKeyInfo info = new SubjectPublicKeyInfo(new AlgorithmIdentifier(PKCSObjectIdentifiers.rsaEncryption, new DERNull()), new RSAPublicKeyStructure(getModulus(), getPublicExponent()).getDERObject());
113
114 try
115 {
116 dOut.writeObject(info);
117 dOut.close();
118 }
119 catch (IOException e)
120 {
121 throw new RuntimeException("Error encoding RSA public key", e);
122 }
123
124 return bOut.toByteArray();
125
126 }
127
128 public boolean equals(Object o)
129 {
130 if ( !(o instanceof RSAPublicKey) )
131 {
132 return false;
133 }
134
135 if ( o == this )
136 {
137 return true;
138 }
139
140 RSAPublicKey key = (RSAPublicKey)o;
141
142 return getModulus().equals(key.getModulus())
143 && getPublicExponent().equals(key.getPublicExponent());
144 }
145
146 public String toString()
147 {
148 StringBuffer buf = new StringBuffer();
149 String nl = System.getProperty("line.separator");
150
151 buf.append("RSA Public Key" + nl);
152 buf.append(" modulus: " + this.getModulus().toString(16) + nl);
153 buf.append(" public exponent: " + this.getPublicExponent().toString(16) + nl);
154
155 return buf.toString();
156 }
157 }