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1
19
20 package com.maverick.crypto.asn1;
21
22 import java.io.IOException  ;
23 import java.math.BigInteger ;
24
25 public class DERInteger
26 extends DERObject
27 {
28 byte[] bytes;
29
30
35 public static DERInteger getInstance(
36 Object obj)
37 {
38 if (obj == null || obj instanceof DERInteger)
39 {
40 return (DERInteger)obj;
41 }
42
43 if (obj instanceof ASN1OctetString)
44 {
45 return new DERInteger(((ASN1OctetString)obj).getOctets());
46 }
47
48 if (obj instanceof ASN1TaggedObject)
49 {
50 return getInstance(((ASN1TaggedObject)obj).getObject());
51 }
52
53 throw new IllegalArgumentException ("illegal object in getInstance: " + obj.getClass().getName());
54 }
55
56
65 public static DERInteger getInstance(
66 ASN1TaggedObject obj,
67 boolean explicit)
68 {
69 return getInstance(obj.getObject());
70 }
71
72 public DERInteger(
73 int value)
74 {
75 bytes = BigInteger.valueOf(value).toByteArray();
76 }
77
78 public DERInteger(
79 BigInteger value)
80 {
81 bytes = value.toByteArray();
82 }
83
84 public DERInteger(
85 byte[] bytes)
86 {
87 this.bytes = bytes;
88 }
89
90 public BigInteger getValue()
91 {
92 return new BigInteger (bytes);
93 }
94
95
99 public BigInteger getPositiveValue()
100 {
101 return new BigInteger (1, bytes);
102 }
103
104 void encode(
105 DEROutputStream out)
106 throws IOException
107 {
108 out.writeEncoded(INTEGER, bytes);
109 }
110
111 public int hashCode()
112 {
113 int value = 0;
114
115 for (int i = 0; i != bytes.length; i++)
116 {
117 value ^= (bytes[i] & 0xff) << (i % 4);
118 }
119
120 return value;
121 }
122
123 public boolean equals(
124 Object o)
125 {
126 if (o == null || !(o instanceof DERInteger))
127 {
128 return false;
129 }
130
131 DERInteger other = (DERInteger)o;
132
133 if (bytes.length != other.bytes.length)
134 {
135 return false;
136 }
137
138 for (int i = 0; i != bytes.length; i++)
139 {
140 if (bytes[i] != other.bytes[i])
141 {
142 return false;
143 }
144 }
145
146 return true;
147 }
148 }
149 |
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