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.asn1;
019
020 import java.io.IOException;
021 import java.math.BigInteger;
022
023 public class DERInteger
024 extends DERObject
025 {
026 byte[] bytes;
027
028 /**
029 * return an integer from the passed in object
030 *
031 * @exception IllegalArgumentException if the object cannot be converted.
032 */
033 public static DERInteger getInstance(
034 Object obj)
035 {
036 if (obj == null || obj instanceof DERInteger)
037 {
038 return (DERInteger)obj;
039 }
040
041 if (obj instanceof ASN1OctetString)
042 {
043 return new DERInteger(((ASN1OctetString)obj).getOctets());
044 }
045
046 if (obj instanceof ASN1TaggedObject)
047 {
048 return getInstance(((ASN1TaggedObject)obj).getObject());
049 }
050
051 throw new IllegalArgumentException("illegal object in getInstance: " + obj.getClass().getName());
052 }
053
054 /**
055 * return an Integer from a tagged object.
056 *
057 * @param obj the tagged object holding the object we want
058 * @param explicit true if the object is meant to be explicitly
059 * tagged false otherwise.
060 * @exception IllegalArgumentException if the tagged object cannot
061 * be converted.
062 */
063 public static DERInteger getInstance(
064 ASN1TaggedObject obj,
065 boolean explicit)
066 {
067 return getInstance(obj.getObject());
068 }
069
070 public DERInteger(
071 int value)
072 {
073 bytes = BigInteger.valueOf(value).toByteArray();
074 }
075
076 public DERInteger(
077 BigInteger value)
078 {
079 bytes = value.toByteArray();
080 }
081
082 public DERInteger(
083 byte[] bytes)
084 {
085 this.bytes = bytes;
086 }
087
088 public BigInteger getValue()
089 {
090 return new BigInteger(bytes);
091 }
092
093 /**
094 * in some cases positive values get crammed into a space,
095 * that's not quite big enough...
096 */
097 public BigInteger getPositiveValue()
098 {
099 return new BigInteger(1, bytes);
100 }
101
102 void encode(
103 DEROutputStream out)
104 throws IOException
105 {
106 out.writeEncoded(INTEGER, bytes);
107 }
108
109 public int hashCode()
110 {
111 int value = 0;
112
113 for (int i = 0; i != bytes.length; i++)
114 {
115 value ^= (bytes[i] & 0xff) << (i % 4);
116 }
117
118 return value;
119 }
120
121 public boolean equals(
122 Object o)
123 {
124 if (o == null || !(o instanceof DERInteger))
125 {
126 return false;
127 }
128
129 DERInteger other = (DERInteger)o;
130
131 if (bytes.length != other.bytes.length)
132 {
133 return false;
134 }
135
136 for (int i = 0; i != bytes.length; i++)
137 {
138 if (bytes[i] != other.bytes[i])
139 {
140 return false;
141 }
142 }
143
144 return true;
145 }
146 }