-
-
Notifications
You must be signed in to change notification settings - Fork 10
Expand file tree
/
Copy pathCborDecoder.cs
More file actions
134 lines (112 loc) · 3.63 KB
/
Copy pathCborDecoder.cs
File metadata and controls
134 lines (112 loc) · 3.63 KB
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
using System.Formats.Cbor;
namespace NpgsqlRestClient.Fido2;
public static class CborDecoder
{
public static AttestationObject? DecodeAttestationObject(byte[] data)
{
try
{
var reader = new CborReader(data, CborConformanceMode.Lax);
string fmt = "none";
byte[] authData = [];
Dictionary<object, object>? attStmt = null;
var mapLength = reader.ReadStartMap();
for (int i = 0; i < mapLength; i++)
{
var key = reader.ReadTextString();
switch (key)
{
case "fmt":
fmt = reader.ReadTextString();
break;
case "authData":
authData = reader.ReadByteString();
break;
case "attStmt":
attStmt = ReadMap(reader);
break;
default:
reader.SkipValue();
break;
}
}
reader.ReadEndMap();
return new AttestationObject
{
Fmt = fmt,
AuthData = authData,
AttStmt = attStmt
};
}
catch
{
return null;
}
}
private static Dictionary<object, object> ReadMap(CborReader reader)
{
var result = new Dictionary<object, object>();
var mapLength = reader.ReadStartMap();
for (int i = 0; i < mapLength; i++)
{
var key = ReadValue(reader);
var value = ReadValue(reader);
if (key != null)
result[key] = value!;
}
reader.ReadEndMap();
return result;
}
private static object? ReadValue(CborReader reader)
{
var state = reader.PeekState();
return state switch
{
CborReaderState.UnsignedInteger => reader.ReadInt64(),
CborReaderState.NegativeInteger => reader.ReadInt64(),
CborReaderState.ByteString => reader.ReadByteString(),
CborReaderState.TextString => reader.ReadTextString(),
CborReaderState.StartArray => ReadArray(reader),
CborReaderState.StartMap => ReadMap(reader),
CborReaderState.Boolean => reader.ReadBoolean(),
CborReaderState.Null => ReadNull(reader),
CborReaderState.Tag => ReadTaggedValue(reader),
CborReaderState.HalfPrecisionFloat or
CborReaderState.SinglePrecisionFloat or
CborReaderState.DoublePrecisionFloat => reader.ReadDouble(),
_ => SkipAndReturnNull(reader)
};
}
private static object? ReadNull(CborReader reader)
{
reader.ReadNull();
return null;
}
private static object? SkipAndReturnNull(CborReader reader)
{
reader.SkipValue();
return null;
}
private static object?[] ReadArray(CborReader reader)
{
var length = reader.ReadStartArray();
var result = new object?[length ?? 0];
for (int i = 0; i < result.Length; i++)
{
result[i] = ReadValue(reader);
}
reader.ReadEndArray();
return result;
}
private static object? ReadTaggedValue(CborReader reader)
{
reader.ReadTag(); // Read and discard the tag
return ReadValue(reader);
}
}
public class AttestationObject
{
public string Fmt { get; set; } = "none";
public byte[] AuthData { get; set; } = [];
public Dictionary<object, object>? AttStmt { get; set; }
}