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
|
//
// Authors:
// Marek Habersack <grendel@twistedcode.net>
//
// (C) 2011 Novell, Inc (http://novell.com/)
//
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
using System;
using System.Web;
using System.Web.Configuration;
using System.Web.Util;
using System.IO;
using System.Security.Cryptography;
using System.Text;
namespace System.Web.Security
{
public static class MachineKey
{
public static byte[] Decode (string encodedData, MachineKeyProtection protectionOption)
{
if (encodedData == null)
throw new ArgumentNullException ("encodedData");
int dlen = encodedData.Length;
if (dlen == 0 || dlen % 2 == 1)
throw new ArgumentException ("encodedData");
byte[] data = MachineKeySectionUtils.GetBytes (encodedData, dlen);
if (data == null || data.Length == 0)
throw new ArgumentException ("encodedData");
var config = WebConfigurationManager.GetWebApplicationSection ("system.web/machineKey") as MachineKeySection;
byte[] result = null;
Exception ex = null;
try {
switch (protectionOption) {
case MachineKeyProtection.All:
result = MachineKeySectionUtils.VerifyDecrypt (config, data);
break;
case MachineKeyProtection.Encryption:
result = MachineKeySectionUtils.Decrypt (config, data);
break;
case MachineKeyProtection.Validation:
result = MachineKeySectionUtils.Verify (config, data);
break;
default:
return MachineKeySectionUtils.GetBytes (encodedData, dlen);
}
} catch (Exception e) {
ex = e;
}
if (result == null || ex != null)
throw new HttpException ("Unable to verify passed data.", ex);
return result;
}
public static string Encode (byte[] data, MachineKeyProtection protectionOption)
{
if (data == null)
throw new ArgumentNullException ("data");
var config = WebConfigurationManager.GetWebApplicationSection ("system.web/machineKey") as MachineKeySection;
byte[] result;
switch (protectionOption) {
case MachineKeyProtection.All:
result = MachineKeySectionUtils.EncryptSign (config, data);
break;
case MachineKeyProtection.Encryption:
result = MachineKeySectionUtils.Encrypt (config, data);
break;
case MachineKeyProtection.Validation:
result = MachineKeySectionUtils.Sign (config, data);
break;
default:
return String.Empty;
}
return MachineKeySectionUtils.GetHexString (result);
}
public static byte[] Protect (byte[] userData, params string[] purposes)
{
if (userData == null)
throw new ArgumentNullException ("userData");
foreach (var purpose in purposes)
{
if (string.IsNullOrWhiteSpace (purpose))
throw new ArgumentException ("all purpose parameters must contain text");
}
var config = WebConfigurationManager.GetWebApplicationSection ("system.web/machineKey") as MachineKeySection;
var purposeJoined = string.Join (";", purposes);
var purposeBytes = GetHashed (purposeJoined);
var bytes = new byte [userData.Length + purposeBytes.Length];
purposeBytes.CopyTo (bytes, 0);
userData.CopyTo (bytes, purposeBytes.Length);
return MachineKeySectionUtils.Encrypt (config, bytes);
}
public static byte[] Unprotect (byte[] protectedData, params string[] purposes)
{
if (protectedData == null)
throw new ArgumentNullException ("protectedData");
foreach (var purpose in purposes) {
if (string.IsNullOrWhiteSpace (purpose))
throw new ArgumentException ("all purpose parameters must contain text");
}
var config = WebConfigurationManager.GetWebApplicationSection ("system.web/machineKey") as MachineKeySection;
var purposeJoined = string.Join (";", purposes);
var purposeBytes = GetHashed (purposeJoined);
var unprotected = MachineKeySectionUtils.Decrypt (config, protectedData);
for (int i = 0; i < purposeBytes.Length; i++) {
if (purposeBytes [i] != unprotected [i])
throw new CryptographicException ();
}
var dataLength = unprotected.Length - purposeBytes.Length;
var result = new byte [dataLength];
Array.Copy (unprotected, purposeBytes.Length, result, 0, dataLength);
return result;
}
static byte[] GetHashed (string purposes)
{
using (var hash = SHA512.Create ()) {
var bytes = Encoding.UTF8.GetBytes (purposes);
return hash.ComputeHash (bytes, 0, bytes.Length);
}
}
}
}
|
