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
|
using System;
using System.Collections;
using System.Diagnostics;
using Org.BouncyCastle.Utilities;
namespace Org.BouncyCastle.Asn1
{
public class BerOctetString
: DerOctetString, IEnumerable
{
private static readonly int DefaultSegmentLimit = 1000;
public static BerOctetString FromSequence(Asn1Sequence seq)
{
int count = seq.Count;
Asn1OctetString[] v = new Asn1OctetString[count];
for (int i = 0; i < count; ++i)
{
v[i] = GetInstance(seq[i]);
}
return new BerOctetString(v);
}
internal static byte[] FlattenOctetStrings(Asn1OctetString[] octetStrings)
{
int count = octetStrings.Length;
switch (count)
{
case 0:
return EmptyOctets;
case 1:
return octetStrings[0].str;
default:
{
int totalOctets = 0;
for (int i = 0; i < count; ++i)
{
totalOctets += octetStrings[i].str.Length;
}
byte[] str = new byte[totalOctets];
int pos = 0;
for (int i = 0; i < count; ++i)
{
byte[] octets = octetStrings[i].str;
Array.Copy(octets, 0, str, pos, octets.Length);
pos += octets.Length;
}
Debug.Assert(pos == totalOctets);
return str;
}
}
}
private static Asn1OctetString[] ToOctetStringArray(IEnumerable e)
{
IList list = Platform.CreateArrayList(e);
int count = list.Count;
Asn1OctetString[] v = new Asn1OctetString[count];
for (int i = 0; i < count; ++i)
{
v[i] = GetInstance(list[i]);
}
return v;
}
private readonly int segmentLimit;
private readonly Asn1OctetString[] elements;
[Obsolete("Will be removed")]
public BerOctetString(IEnumerable e)
: this(ToOctetStringArray(e))
{
}
public BerOctetString(byte[] str)
: this(str, DefaultSegmentLimit)
{
}
public BerOctetString(Asn1OctetString[] elements)
: this(elements, DefaultSegmentLimit)
{
}
public BerOctetString(byte[] str, int segmentLimit)
: this(str, null, segmentLimit)
{
}
public BerOctetString(Asn1OctetString[] elements, int segmentLimit)
: this(FlattenOctetStrings(elements), elements, segmentLimit)
{
}
private BerOctetString(byte[] octets, Asn1OctetString[] elements, int segmentLimit)
: base(octets)
{
this.elements = elements;
this.segmentLimit = segmentLimit;
}
/**
* return the DER octets that make up this string.
*/
public IEnumerator GetEnumerator()
{
if (elements == null)
return new ChunkEnumerator(str, segmentLimit);
return elements.GetEnumerator();
}
[Obsolete("Use GetEnumerator() instead")]
public IEnumerator GetObjects()
{
return GetEnumerator();
}
private bool IsConstructed
{
get { return null != elements || str.Length > segmentLimit; }
}
internal override int EncodedLength(bool withID)
{
throw Platform.CreateNotImplementedException("BerOctetString.EncodedLength");
// TODO This depends on knowing it's not DER
//if (!IsConstructed)
// return EncodedLength(withID, str.Length);
//int totalLength = withID ? 4 : 3;
//if (null != elements)
//{
// for (int i = 0; i < elements.Length; ++i)
// {
// totalLength += elements[i].EncodedLength(true);
// }
//}
//else
//{
// int fullSegments = str.Length / segmentLimit;
// totalLength += fullSegments * EncodedLength(true, segmentLimit);
// int lastSegmentLength = str.Length - (fullSegments * segmentLimit);
// if (lastSegmentLength > 0)
// {
// totalLength += EncodedLength(true, lastSegmentLength);
// }
//}
//return totalLength;
}
internal override void Encode(Asn1OutputStream asn1Out, bool withID)
{
if (!asn1Out.IsBer || !IsConstructed)
{
base.Encode(asn1Out, withID);
return;
}
asn1Out.WriteIdentifier(withID, Asn1Tags.Constructed | Asn1Tags.OctetString);
asn1Out.WriteByte(0x80);
if (null != elements)
{
asn1Out.WritePrimitives(elements);
}
else
{
int pos = 0;
while (pos < str.Length)
{
int segmentLength = System.Math.Min(str.Length - pos, segmentLimit);
Encode(asn1Out, true, str, pos, segmentLength);
pos += segmentLength;
}
}
asn1Out.WriteByte(0x00);
asn1Out.WriteByte(0x00);
}
private class ChunkEnumerator
: IEnumerator
{
private readonly byte[] octets;
private readonly int segmentLimit;
private DerOctetString currentSegment = null;
private int nextSegmentPos = 0;
internal ChunkEnumerator(byte[] octets, int segmentLimit)
{
this.octets = octets;
this.segmentLimit = segmentLimit;
}
public object Current
{
get
{
if (null == currentSegment)
throw new InvalidOperationException();
return currentSegment;
}
}
public bool MoveNext()
{
if (nextSegmentPos >= octets.Length)
{
this.currentSegment = null;
return false;
}
int length = System.Math.Min(octets.Length - nextSegmentPos, segmentLimit);
byte[] segment = new byte[length];
Array.Copy(octets, nextSegmentPos, segment, 0, length);
this.currentSegment = new DerOctetString(segment);
this.nextSegmentPos += length;
return true;
}
public void Reset()
{
this.currentSegment = null;
this.nextSegmentPos = 0;
}
}
}
}
|
