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
|
using System;
using System.IO;
using Org.BouncyCastle.Utilities.IO;
namespace Org.BouncyCastle.Asn1
{
public class BerOctetStringGenerator
: BerGenerator
{
public BerOctetStringGenerator(Stream outStream)
: base(outStream)
{
WriteBerHeader(Asn1Tags.Constructed | Asn1Tags.OctetString);
}
public BerOctetStringGenerator(
Stream outStream,
int tagNo,
bool isExplicit)
: base(outStream, tagNo, isExplicit)
{
WriteBerHeader(Asn1Tags.Constructed | Asn1Tags.OctetString);
}
public Stream GetOctetOutputStream()
{
return GetOctetOutputStream(new byte[1000]); // limit for CER encoding.
}
public Stream GetOctetOutputStream(
int bufSize)
{
return bufSize < 1
? GetOctetOutputStream()
: GetOctetOutputStream(new byte[bufSize]);
}
public Stream GetOctetOutputStream(
byte[] buf)
{
return new BufferedBerOctetStream(this, buf);
}
private class BufferedBerOctetStream
: BaseOutputStream
{
private byte[] _buf;
private int _off;
private readonly BerOctetStringGenerator _gen;
private readonly Asn1OutputStream _derOut;
internal BufferedBerOctetStream(
BerOctetStringGenerator gen,
byte[] buf)
{
_gen = gen;
_buf = buf;
_off = 0;
_derOut = Asn1OutputStream.Create(_gen.Out, Asn1Encodable.Der);
}
public override void WriteByte(
byte b)
{
_buf[_off++] = b;
if (_off == _buf.Length)
{
DerOctetString.Encode(_derOut, _buf, 0, _off);
_off = 0;
}
}
public override void Write(byte[] b, int off, int len)
{
int bufLen = _buf.Length;
int available = bufLen - _off;
if (len < available)
{
Array.Copy(b, off, _buf, _off, len);
_off += len;
return;
}
int count = 0;
if (_off > 0)
{
Array.Copy(b, off, _buf, _off, available);
count += available;
DerOctetString.Encode(_derOut, _buf, 0, bufLen);
}
int remaining;
while ((remaining = len - count) >= bufLen)
{
DerOctetString.Encode(_derOut, b, off + count, bufLen);
count += bufLen;
}
Array.Copy(b, off + count, _buf, 0, remaining);
this._off = remaining;
}
#if PORTABLE
protected override void Dispose(bool disposing)
{
if (disposing)
{
if (_off != 0)
{
DerOctetString.Encode(_derOut, _buf, 0, _off);
}
_gen.WriteBerEnd();
}
base.Dispose(disposing);
}
#else
public override void Close()
{
if (_off != 0)
{
DerOctetString.Encode(_derOut, _buf, 0, _off);
}
_gen.WriteBerEnd();
base.Close();
}
#endif
}
}
}
|
