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
|
using System;
using System.IO;
using Org.BouncyCastle.Utilities;
namespace Org.BouncyCastle.Tls
{
/// <summary>RFC 6066 5.</summary>
public sealed class UrlAndHash
{
private readonly string m_url;
private readonly byte[] m_sha1Hash;
public UrlAndHash(string url, byte[] sha1Hash)
{
if (TlsUtilities.IsNullOrEmpty(url) || url.Length >= (1 << 16))
throw new ArgumentException("must have length from 1 to (2^16 - 1)", "url");
if (sha1Hash != null && sha1Hash.Length != 20)
throw new ArgumentException("must have length == 20, if present", "sha1Hash");
this.m_url = url;
this.m_sha1Hash = sha1Hash;
}
public string Url
{
get { return m_url; }
}
public byte[] Sha1Hash
{
get { return m_sha1Hash; }
}
/// <summary>Encode this <see cref="UrlAndHash"/> to a <see cref="Stream"/>.</summary>
/// <param name="output">the <see cref="Stream"/> to encode to.</param>
/// <exception cref="IOException"/>
public void Encode(Stream output)
{
byte[] urlEncoding = Strings.ToByteArray(m_url);
TlsUtilities.WriteOpaque16(urlEncoding, output);
if (m_sha1Hash == null)
{
TlsUtilities.WriteUint8(0, output);
}
else
{
TlsUtilities.WriteUint8(1, output);
output.Write(m_sha1Hash, 0, m_sha1Hash.Length);
}
}
/// <summary>Parse a <see cref="UrlAndHash"/> from a <see cref="Stream"/>.</summary>
/// <param name="context">the <see cref="TlsContext"/> of the current connection.</param>
/// <param name="input">the <see cref="Stream"/> to parse from.</param>
/// <returns>a <see cref="UrlAndHash"/> object.</returns>
/// <exception cref="IOException"/>
public static UrlAndHash Parse(TlsContext context, Stream input)
{
byte[] urlEncoding = TlsUtilities.ReadOpaque16(input, 1);
string url = Strings.FromByteArray(urlEncoding);
byte[] sha1Hash = null;
short padding = TlsUtilities.ReadUint8(input);
switch (padding)
{
case 0:
if (TlsUtilities.IsTlsV12(context))
throw new TlsFatalAlert(AlertDescription.illegal_parameter);
break;
case 1:
sha1Hash = TlsUtilities.ReadFully(20, input);
break;
default:
throw new TlsFatalAlert(AlertDescription.illegal_parameter);
}
return new UrlAndHash(url, sha1Hash);
}
}
}
|
