forked from oznetmaster/SSMonoCryptographyLibrary
-
Notifications
You must be signed in to change notification settings - Fork 0
/
DSACryptoServiceProvider.cs
328 lines (287 loc) · 8.81 KB
/
DSACryptoServiceProvider.cs
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
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
//
// System.Security.Cryptography.DSACryptoServiceProvider.cs
//
// Authors:
// Dan Lewis (dihlewis@yahoo.co.uk)
// Sebastien Pouliot <sebastien@ximian.com>
// Ben Maurer (bmaurer@users.sf.net)
//
// (C) 2002
// Portions (C) 2002, 2003 Motus Technologies Inc. (http://www.motus.com)
// Portions (C) 2003 Ben Maurer
// Copyright (C) 2004-2005 Novell, Inc (http://www.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.Globalization;
#if SSHARP
using Crestron.SimplSharp.CrestronIO;
using System.Runtime.InteropServices;
#else
using System.IO;
using System.Runtime.InteropServices;
#endif
using Mono.Security.Cryptography;
namespace SSMono.Security.Cryptography
{
[ComVisible (true)]
public sealed class DSACryptoServiceProvider : DSA, ICspAsymmetricAlgorithm
{
private const int PROV_DSS_DH = 13; // from WinCrypt.h
private KeyPairPersistence store;
private bool persistKey;
private bool persisted;
private bool privateKeyExportable = true;
private bool m_disposed;
private DSAManaged dsa;
// MS implementation generates a keypair everytime a new DSA
// object is created (unless an existing key container is
// specified in the CspParameters).
// However we:
// (a) often use DSA to import an existing keypair.
// (b) take a LOT of time to generate the DSA group
// So we'll generate the keypair only when (and if) it's being
// used (or exported). This should save us a lot of time (at
// least in the unit tests).
public DSACryptoServiceProvider ()
: this (1024)
{
}
public DSACryptoServiceProvider (CspParameters parameters)
: this (1024, parameters)
{
}
public DSACryptoServiceProvider (int dwKeySize)
{
Common (dwKeySize, false);
}
public DSACryptoServiceProvider (int dwKeySize, CspParameters parameters)
{
bool has_parameters = parameters != null;
Common (dwKeySize, has_parameters);
if (has_parameters)
Common (parameters);
}
void Common (int dwKeySize, bool parameters)
{
LegalKeySizesValue = new KeySizes[1];
LegalKeySizesValue[0] = new KeySizes (512, 1024, 64);
// will throw an exception is key size isn't supported
KeySize = dwKeySize;
dsa = new DSAManaged (dwKeySize);
dsa.KeyGenerated += new DSAManaged.KeyGeneratedEventHandler (OnKeyGenerated);
persistKey = parameters;
if (parameters)
return;
var p = new CspParameters (PROV_DSS_DH);
if (useMachineKeyStore)
p.Flags |= CspProviderFlags.UseMachineKeyStore;
store = new KeyPairPersistence (p);
// no need to load - it cannot exists
}
void Common (CspParameters parameters)
{
store = new KeyPairPersistence (parameters);
store.Load ();
if (store.KeyValue != null)
{
persisted = true;
this.FromXmlString (store.KeyValue);
}
}
~DSACryptoServiceProvider ()
{
Dispose (false);
}
// DSA isn't used for key exchange
public override string KeyExchangeAlgorithm
{
get { return null; }
}
public override int KeySize
{
get { return dsa.KeySize; }
}
public bool PersistKeyInCsp
{
get { return persistKey; }
set { persistKey = value; }
}
[ComVisible (false)]
public bool PublicOnly
{
get { return dsa.PublicOnly; }
}
public override string SignatureAlgorithm
{
get { return "http://www.w3.org/2000/09/xmldsig#dsa-sha1"; }
}
private static bool useMachineKeyStore;
public static bool UseMachineKeyStore
{
get { return useMachineKeyStore; }
set { useMachineKeyStore = value; }
}
public override DSAParameters ExportParameters (bool includePrivateParameters)
{
if ((includePrivateParameters) && (!privateKeyExportable))
{
throw new CryptographicException (
Locale.GetText ("Cannot export private key"));
}
return dsa.ExportParameters (includePrivateParameters);
}
public override void ImportParameters (DSAParameters parameters)
{
dsa.ImportParameters (parameters);
}
public override byte[] CreateSignature (byte[] rgbHash)
{
return dsa.CreateSignature (rgbHash);
}
public byte[] SignData (byte[] buffer)
{
// right now only SHA1 is supported by FIPS186-2
HashAlgorithm hash = SHA1.Create ();
byte[] toBeSigned = hash.ComputeHash (buffer);
return dsa.CreateSignature (toBeSigned);
}
public byte[] SignData (byte[] buffer, int offset, int count)
{
// right now only SHA1 is supported by FIPS186-2
HashAlgorithm hash = SHA1.Create ();
byte[] toBeSigned = hash.ComputeHash (buffer, offset, count);
return dsa.CreateSignature (toBeSigned);
}
public byte[] SignData (Stream inputStream)
{
// right now only SHA1 is supported by FIPS186-2
HashAlgorithm hash = SHA1.Create ();
byte[] toBeSigned = hash.ComputeHash (inputStream);
return dsa.CreateSignature (toBeSigned);
}
public byte[] SignHash (byte[] rgbHash, string str)
{
// right now only SHA1 is supported by FIPS186-2
if (String.Compare (str, "SHA1", true, CultureInfo.InvariantCulture) != 0)
{
// not documented
throw new CryptographicException (Locale.GetText ("Only SHA1 is supported."));
}
return dsa.CreateSignature (rgbHash);
}
public bool VerifyData (byte[] rgbData, byte[] rgbSignature)
{
// right now only SHA1 is supported by FIPS186-2
HashAlgorithm hash = SHA1.Create ();
byte[] toBeVerified = hash.ComputeHash (rgbData);
return dsa.VerifySignature (toBeVerified, rgbSignature);
}
// LAMESPEC: MD5 isn't allowed with DSA
public bool VerifyHash (byte[] rgbHash, string str, byte[] rgbSignature)
{
if (str == null)
str = "SHA1"; // default value
if (String.Compare (str, "SHA1", true, CultureInfo.InvariantCulture) != 0)
{
throw new CryptographicException (Locale.GetText ("Only SHA1 is supported."));
}
return dsa.VerifySignature (rgbHash, rgbSignature);
}
public override bool VerifySignature (byte[] rgbHash, byte[] rgbSignature)
{
return dsa.VerifySignature (rgbHash, rgbSignature);
}
protected override void Dispose (bool disposing)
{
if (!m_disposed)
{
// the key is persisted and we do not want it persisted
if ((persisted) && (!persistKey))
{
store.Remove (); // delete the container
}
if (dsa != null)
dsa.Clear ();
// call base class
// no need as they all are abstract before us
m_disposed = true;
}
}
// private stuff
private void OnKeyGenerated (object sender, EventArgs e)
{
// the key isn't persisted and we want it persisted
if ((persistKey) && (!persisted))
{
// save the current keypair
store.KeyValue = this.ToXmlString (!dsa.PublicOnly);
store.Save ();
persisted = true;
}
}
// ICspAsymmetricAlgorithm
[MonoTODO ("call into KeyPairPersistence to get details")]
[ComVisible (false)]
public CspKeyContainerInfo CspKeyContainerInfo
{
get { return null; }
}
[ComVisible (false)]
public byte[] ExportCspBlob (bool includePrivateParameters)
{
byte[] blob = null;
if (includePrivateParameters)
blob = CryptoConvert.ToCapiPrivateKeyBlob (this);
else
blob = CryptoConvert.ToCapiPublicKeyBlob (this);
return blob;
}
[ComVisible (false)]
public void ImportCspBlob (byte[] keyBlob)
{
if (keyBlob == null)
throw new ArgumentNullException ("keyBlob");
DSA dsa = CryptoConvert.FromCapiKeyBlobDSA (keyBlob);
if (dsa is DSACryptoServiceProvider)
{
DSAParameters dsap = dsa.ExportParameters (!(dsa as DSACryptoServiceProvider).PublicOnly);
ImportParameters (dsap);
}
else
{
// we can't know from DSA if the private key is available
try
{
// so we try it...
DSAParameters dsap = dsa.ExportParameters (true);
ImportParameters (dsap);
}
catch
{
// and fall back
DSAParameters dsap = dsa.ExportParameters (false);
ImportParameters (dsap);
}
}
}
}
}