1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
|
package com.lowagie.bc.asn1;
import java.io.ByteArrayInputStream;
import java.io.EOFException;
import java.io.FilterInputStream;
import java.io.IOException;
import java.io.InputStream;
/**
* Don't use this class. It will eventually disappear, use ASN1InputStream.
* <br>
* This class is scheduled for removal.
*/
public class DERInputStream
extends FilterInputStream implements DERTags
{
public DERInputStream(
InputStream is)
{
super(is);
}
protected int readLength()
throws IOException
{
int length = read();
if (length < 0)
{
throw new IOException("EOF found when length expected");
}
if (length == 0x80)
{
return -1; // indefinite-length encoding
}
if (length > 127)
{
int size = length & 0x7f;
length = 0;
for (int i = 0; i < size; i++)
{
int next = read();
if (next < 0)
{
throw new IOException("EOF found reading length");
}
length = (length << 8) + next;
}
}
return length;
}
protected void readFully(
byte[] bytes)
throws IOException
{
int left = bytes.length;
if (left == 0)
{
return;
}
while (left > 0)
{
int l = read(bytes, bytes.length - left, left);
if (l < 0)
{
throw new EOFException("unexpected end of stream");
}
left -= l;
}
}
/**
* build an object given its tag and a byte stream to construct it
* from.
*/
protected DERObject buildObject(
int tag,
byte[] bytes)
throws IOException
{
switch (tag)
{
case NULL:
return null;
case SEQUENCE | CONSTRUCTED:
ByteArrayInputStream bIn = new ByteArrayInputStream(bytes);
BERInputStream dIn = new BERInputStream(bIn);
DERConstructedSequence seq = new DERConstructedSequence();
try
{
for (;;)
{
DERObject obj = dIn.readObject();
seq.addObject(obj);
}
}
catch (EOFException ex)
{
return seq;
}
case SET | CONSTRUCTED:
bIn = new ByteArrayInputStream(bytes);
dIn = new BERInputStream(bIn);
ASN1EncodableVector v = new ASN1EncodableVector();
try
{
for (;;)
{
DERObject obj = dIn.readObject();
v.add(obj);
}
}
catch (EOFException ex)
{
return new DERConstructedSet(v);
}
case BOOLEAN:
return new DERBoolean(bytes);
case INTEGER:
return new DERInteger(bytes);
case ENUMERATED:
return new DEREnumerated(bytes);
case OBJECT_IDENTIFIER:
return new DERObjectIdentifier(bytes);
case BIT_STRING:
int padBits = bytes[0];
byte[] data = new byte[bytes.length - 1];
System.arraycopy(bytes, 1, data, 0, bytes.length - 1);
return new DERBitString(data, padBits);
case UTF8_STRING:
return new DERUTF8String(bytes);
case PRINTABLE_STRING:
return new DERPrintableString(bytes);
case IA5_STRING:
return new DERIA5String(bytes);
case T61_STRING:
return new DERT61String(bytes);
case VISIBLE_STRING:
return new DERVisibleString(bytes);
case UNIVERSAL_STRING:
return new DERUniversalString(bytes);
case GENERAL_STRING:
return new DERGeneralString(bytes);
case BMP_STRING:
return new DERBMPString(bytes);
case OCTET_STRING:
return new DEROctetString(bytes);
case UTC_TIME:
return new DERUTCTime(bytes);
case GENERALIZED_TIME:
return new DERGeneralizedTime(bytes);
default:
//
// with tagged object tag number is bottom 5 bits
//
if ((tag & TAGGED) != 0)
{
if ((tag & 0x1f) == 0x1f)
{
throw new IOException("unsupported high tag encountered");
}
if (bytes.length == 0) // empty tag!
{
if ((tag & CONSTRUCTED) == 0)
{
return new DERTaggedObject(false, tag & 0x1f, new DERNull());
}
else
{
return new DERTaggedObject(false, tag & 0x1f, new DERConstructedSequence());
}
}
//
// simple type - implicit... return an octet string
//
if ((tag & CONSTRUCTED) == 0)
{
return new DERTaggedObject(false, tag & 0x1f, new DEROctetString(bytes));
}
bIn = new ByteArrayInputStream(bytes);
dIn = new BERInputStream(bIn);
DEREncodable dObj = dIn.readObject();
//
// explicitly tagged (probably!) - if it isn't we'd have to
// tell from the context
//
if (dIn.available() == 0)
{
return new DERTaggedObject(tag & 0x1f, dObj);
}
//
// another implicit object, we'll create a sequence...
//
seq = new DERConstructedSequence();
seq.addObject(dObj);
try
{
for (;;)
{
dObj = dIn.readObject();
seq.addObject(dObj);
}
}
catch (EOFException ex)
{
// ignore --
}
return new DERTaggedObject(false, tag & 0x1f, seq);
}
return new DERUnknownTag(tag, bytes);
}
}
public DERObject readObject()
throws IOException
{
int tag = read();
if (tag == -1)
{
throw new EOFException();
}
int length = readLength();
byte[] bytes = new byte[length];
readFully(bytes);
return buildObject(tag, bytes);
}
}
|
