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
|
using System;
using System.IO;
namespace Org.BouncyCastle.Crypto.IO
{
public class MacStream
: Stream
{
protected readonly Stream stream;
protected readonly IMac inMac;
protected readonly IMac outMac;
public MacStream(
Stream stream,
IMac readMac,
IMac writeMac)
{
this.stream = stream;
this.inMac = readMac;
this.outMac = writeMac;
}
public virtual IMac ReadMac()
{
return inMac;
}
public virtual IMac WriteMac()
{
return outMac;
}
public override int Read(
byte[] buffer,
int offset,
int count)
{
int n = stream.Read(buffer, offset, count);
if (inMac != null)
{
if (n > 0)
{
inMac.BlockUpdate(buffer, offset, n);
}
}
return n;
}
public override int ReadByte()
{
int b = stream.ReadByte();
if (inMac != null)
{
if (b >= 0)
{
inMac.Update((byte)b);
}
}
return b;
}
public override void Write(
byte[] buffer,
int offset,
int count)
{
if (outMac != null)
{
if (count > 0)
{
outMac.BlockUpdate(buffer, offset, count);
}
}
stream.Write(buffer, offset, count);
}
public override void WriteByte(byte b)
{
if (outMac != null)
{
outMac.Update(b);
}
stream.WriteByte(b);
}
public override bool CanRead
{
get { return stream.CanRead; }
}
public override bool CanWrite
{
get { return stream.CanWrite; }
}
public override bool CanSeek
{
get { return stream.CanSeek; }
}
public override long Length
{
get { return stream.Length; }
}
public override long Position
{
get { return stream.Position; }
set { stream.Position = value; }
}
protected override void Dispose(bool disposing)
{
if (disposing)
{
stream.Dispose();
}
}
public override void Flush()
{
stream.Flush();
}
public override long Seek(
long offset,
SeekOrigin origin)
{
return stream.Seek(offset,origin);
}
public override void SetLength(
long length)
{
stream.SetLength(length);
}
}
}
|
