mcs/class/corlib/System.Security.Cryptography/CryptoConfig.cs

   1 //
   2 // CryptoConfig.cs: Handles cryptographic implementations and OIDs mappings.
   3 //
   4 // Author:
   5 //      Sebastien Pouliot (sebastien@ximian.com)
   6 //      Tim Coleman (tim@timcoleman.com)
   7 //
   8 // (C) 2002, 2003 Motus Technologies Inc. (http://www.motus.com)
   9 // Copyright (C) Tim Coleman, 2004
  10 // Copyright (C) 2004-2007 Novell, Inc (http://www.novell.com)
  11 //
  12 // Permission is hereby granted, free of charge, to any person obtaining
  13 // a copy of this software and associated documentation files (the
  14 // "Software"), to deal in the Software without restriction, including
  15 // without limitation the rights to use, copy, modify, merge, publish,
  16 // distribute, sublicense, and/or sell copies of the Software, and to
  17 // permit persons to whom the Software is furnished to do so, subject to
  18 // the following conditions:
  19 //
  20 // The above copyright notice and this permission notice shall be
  21 // included in all copies or substantial portions of the Software.
  22 //
  23 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  24 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  25 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  26 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  27 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  28 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  29 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  30 //
  31
  32 #if !MOONLIGHT
  33
  34 using System.Collections;
  35 using System.Globalization;
  36 using System.IO;
  37 using System.Reflection;
  38 using System.Runtime.CompilerServices;
  39 using System.Runtime.InteropServices;
  40 using System.Security.Permissions;
  41 using System.Text;
  42
  43 using Mono.Xml;
  44
  45 namespace System.Security.Cryptography {
  46
  47 [ComVisible (true)]
  48 public partial      class CryptoConfig {
  49
  50         static private object lockObject;
  51         static private Hashtable algorithms;
  52         static private Hashtable oid;
  53
  54         private const string defaultNamespace = "System.Security.Cryptography.";
  55         private const string defaultSHA1 = defaultNamespace + "SHA1CryptoServiceProvider";
  56         private const string defaultMD5 = defaultNamespace + "MD5CryptoServiceProvider";
  57         private const string defaultSHA256 = defaultNamespace + "SHA256Managed";
  58         private const string defaultSHA384 = defaultNamespace + "SHA384Managed";
  59         private const string defaultSHA512 = defaultNamespace + "SHA512Managed";
  60         private const string defaultRSA = defaultNamespace + "RSACryptoServiceProvider";
  61         private const string defaultDSA = defaultNamespace + "DSACryptoServiceProvider";
  62         private const string defaultDES = defaultNamespace + "DESCryptoServiceProvider";
  63         private const string default3DES = defaultNamespace + "TripleDESCryptoServiceProvider";
  64         private const string defaultRC2 = defaultNamespace + "RC2CryptoServiceProvider";
  65         private const string defaultAES = defaultNamespace + "RijndaelManaged";
  66         // LAMESPEC: undocumented names in CryptoConfig
  67         private const string defaultRNG = defaultNamespace + "RNGCryptoServiceProvider";
  68         private const string defaultHMAC = defaultNamespace + "HMACSHA1";
  69         private const string defaultMAC3DES = defaultNamespace + "MACTripleDES";
  70         // LAMESPEC: undocumented classes (also undocumented in CryptoConfig ;-)
  71         private const string defaultDSASigDesc = defaultNamespace + "DSASignatureDescription";
  72         private const string defaultRSASigDesc = defaultNamespace + "RSAPKCS1SHA1SignatureDescription";
  73         private const string defaultRIPEMD160 = defaultNamespace + "RIPEMD160Managed";
  74         private const string defaultHMACMD5 = defaultNamespace + "HMACMD5";
  75         private const string defaultHMACRIPEMD160 = defaultNamespace + "HMACRIPEMD160";
  76         private const string defaultHMACSHA256 = defaultNamespace + "HMACSHA256";
  77         private const string defaultHMACSHA384 = defaultNamespace + "HMACSHA384";
  78         private const string defaultHMACSHA512 = defaultNamespace + "HMACSHA512";
  79
  80         // LAMESPEC: undocumented names in CryptoConfig
  81         private const string defaultC14N = defaultNamespace + "Xml.XmlDsigC14NTransform, " + Consts.AssemblySystem_Security;
  82         private const string defaultC14NWithComments = defaultNamespace + "Xml.XmlDsigC14NWithCommentsTransform, " + Consts.AssemblySystem_Security;
  83         private const string defaultBase64 = defaultNamespace + "Xml.XmlDsigBase64Transform, " + Consts.AssemblySystem_Security;
  84         private const string defaultXPath = defaultNamespace + "Xml.XmlDsigXPathTransform, " + Consts.AssemblySystem_Security;
  85         private const string defaultXslt = defaultNamespace + "Xml.XmlDsigXsltTransform, " + Consts.AssemblySystem_Security;
  86         private const string defaultEnveloped = defaultNamespace + "Xml.XmlDsigEnvelopedSignatureTransform, " + Consts.AssemblySystem_Security;
  87         private const string defaultXmlDecryption = defaultNamespace + "Xml.XmlDecryptionTransform, " + Consts.AssemblySystem_Security;
  88         private const string defaultExcC14N = defaultNamespace + "Xml.XmlDsigExcC14NTransform, " + Consts.AssemblySystem_Security;
  89         private const string defaultExcC14NWithComments = defaultNamespace + "Xml.XmlDsigExcC14NWithCommentsTransform, " + Consts.AssemblySystem_Security;
  90
  91         // LAMESPEC: only documentated in ".NET Framework Security" book
  92         private const string defaultX509Data = defaultNamespace + "Xml.KeyInfoX509Data, " + Consts.AssemblySystem_Security;
  93         private const string defaultKeyName = defaultNamespace + "Xml.KeyInfoName, " + Consts.AssemblySystem_Security;
  94         private const string defaultKeyValueDSA = defaultNamespace + "Xml.DSAKeyValue, " + Consts.AssemblySystem_Security;
  95         private const string defaultKeyValueRSA = defaultNamespace + "Xml.RSAKeyValue, " + Consts.AssemblySystem_Security;
  96         private const string defaultRetrievalMethod = defaultNamespace + "Xml.KeyInfoRetrievalMethod, " + Consts.AssemblySystem_Security;
  97
  98         private const string managedSHA1 = defaultNamespace + "SHA1Managed";
  99
 100         // Oddly OID seems only available for hash algorithms
 101         private const string oidSHA1 = "1.3.14.3.2.26";
 102         private const string oidMD5 = "1.2.840.113549.2.5";
 103         // changed in 2.0
 104         private const string oidSHA256 = "2.16.840.1.101.3.4.2.1";
 105         private const string oidSHA384 = "2.16.840.1.101.3.4.2.2";
 106         private const string oidSHA512 = "2.16.840.1.101.3.4.2.3";
 107         // new in 2.0
 108 //      private const string oidRSA = "1.2.840.113549.1.1.1";
 109 //      private const string oidDSA = "1.2.840.10040.4.1";
 110         private const string oidDES = "1.3.14.3.2.7";
 111         private const string oid3DES = "1.2.840.113549.3.7";
 112         private const string oidRC2 = "1.2.840.113549.3.2";
 113         // LAMESPEC: only documentated in ".NET Framework Security" book
 114         private const string oid3DESKeyWrap = "1.2.840.113549.1.9.16.3.6";
 115
 116         private const string nameSHA1a = "SHA";
 117         private const string nameSHA1b = "SHA1";
 118         private const string nameSHA1c = "System.Security.Cryptography.SHA1";
 119         private const string nameSHA1d = "System.Security.Cryptography.HashAlgorithm";
 120         private const string nameMD5a = "MD5";
 121         private const string nameMD5b = "System.Security.Cryptography.MD5";
 122         private const string nameSHA256a = "SHA256";
 123         private const string nameSHA256b = "SHA-256";
 124         private const string nameSHA256c = "System.Security.Cryptography.SHA256";
 125         private const string nameSHA384a = "SHA384";
 126         private const string nameSHA384b = "SHA-384";
 127         private const string nameSHA384c = "System.Security.Cryptography.SHA384";
 128         private const string nameSHA512a = "SHA512";
 129         private const string nameSHA512b = "SHA-512";
 130         private const string nameSHA512c = "System.Security.Cryptography.SHA512";
 131         private const string nameRSAa = "RSA";
 132         private const string nameRSAb = "System.Security.Cryptography.RSA";
 133         private const string nameRSAc = "System.Security.Cryptography.AsymmetricAlgorithm";
 134         private const string nameDSAa = "DSA";
 135         private const string nameDSAb = "System.Security.Cryptography.DSA";
 136         private const string nameDESa = "DES";
 137         private const string nameDESb = "System.Security.Cryptography.DES";
 138         private const string name3DESa = "3DES";
 139         private const string name3DESb = "TripleDES";
 140         private const string name3DESc = "Triple DES";
 141         private const string name3DESd = "System.Security.Cryptography.TripleDES";
 142         private const string nameRC2a = "RC2";
 143         private const string nameRC2b = "System.Security.Cryptography.RC2";
 144         private const string nameAESa = "Rijndael";
 145         private const string nameAESb = "System.Security.Cryptography.Rijndael";
 146         private const string nameAESc = "System.Security.Cryptography.SymmetricAlgorithm";
 147         // LAMESPEC: undocumented names in CryptoConfig
 148         private const string nameRNGa = "RandomNumberGenerator";
 149         private const string nameRNGb = "System.Security.Cryptography.RandomNumberGenerator";
 150         private const string nameKeyHasha = "System.Security.Cryptography.KeyedHashAlgorithm";
 151         private const string nameHMACSHA1a = "HMACSHA1";
 152         private const string nameHMACSHA1b = "System.Security.Cryptography.HMACSHA1";
 153         private const string nameMAC3DESa = "MACTripleDES";
 154         private const string nameMAC3DESb = "System.Security.Cryptography.MACTripleDES";
 155         // LAMESPEC: only documentated in ".NET Framework Security" book
 156         private const string name3DESKeyWrap = "TripleDESKeyWrap";
 157         private const string nameRIPEMD160a = "RIPEMD160";
 158         private const string nameRIPEMD160b = "RIPEMD-160";
 159         private const string nameRIPEMD160c = "System.Security.Cryptography.RIPEMD160";
 160 //      private const string nameHMACa = "HMAC";
 161         private const string nameHMACb = "System.Security.Cryptography.HMAC";
 162         private const string nameHMACMD5a = "HMACMD5";
 163         private const string nameHMACMD5b = "System.Security.Cryptography.HMACMD5";
 164         private const string nameHMACRIPEMD160a = "HMACRIPEMD160";
 165         private const string nameHMACRIPEMD160b = "System.Security.Cryptography.HMACRIPEMD160";
 166         private const string nameHMACSHA256a = "HMACSHA256";
 167         private const string nameHMACSHA256b = "System.Security.Cryptography.HMACSHA256";
 168         private const string nameHMACSHA384a = "HMACSHA384";
 169         private const string nameHMACSHA384b = "System.Security.Cryptography.HMACSHA384";
 170         private const string nameHMACSHA512a = "HMACSHA512";
 171         private const string nameHMACSHA512b = "System.Security.Cryptography.HMACSHA512";
 172
 173         private const string urlXmlDsig = "http://www.w3.org/2000/09/xmldsig#";
 174         // LAMESPEC: undocumented URLs in CryptoConfig
 175         private const string urlDSASHA1 = urlXmlDsig + "dsa-sha1";                      // no space
 176         private const string urlRSASHA1 = urlXmlDsig + "rsa-sha1";                      // no space
 177         private const string urlSHA1 = urlXmlDsig + "sha1";                             // no space
 178         private const string urlC14N = "http://www.w3.org/TR/2001/REC-xml-c14n-20010315";
 179         private const string urlC14NWithComments = "http://www.w3.org/TR/2001/REC-xml-c14n-20010315#WithComments";
 180         private const string urlBase64 = "http://www.w3.org/2000/09/xmldsig#base64";
 181         private const string urlXPath = "http://www.w3.org/TR/1999/REC-xpath-19991116";
 182         private const string urlXslt = "http://www.w3.org/TR/1999/REC-xslt-19991116";
 183         private const string urlEnveloped = urlXmlDsig + "enveloped-signature";         // no space
 184         private const string urlXmlDecryption = "http://www.w3.org/2002/07/decrypt#XML";
 185         private const string urlExcC14NWithComments = "http://www.w3.org/2001/10/xml-exc-c14n#WithComments";
 186         private const string urlExcC14N = "http://www.w3.org/2001/10/xml-exc-c14n#";
 187         private const string urlSHA256 = "http://www.w3.org/2001/04/xmlenc#sha256";
 188         private const string urlSHA512 = "http://www.w3.org/2001/04/xmlenc#sha512";
 189         private const string urlHMACSHA256 = "http://www.w3.org/2001/04/xmldsig-more#hmac-sha256";
 190         private const string urlHMACSHA384 = "http://www.w3.org/2001/04/xmldsig-more#hmac-sha384";
 191         private const string urlHMACSHA512 = "http://www.w3.org/2001/04/xmldsig-more#hmac-sha512";
 192         private const string urlHMACRIPEMD160 = "http://www.w3.org/2001/04/xmldsig-more#hmac-ripemd160";
 193
 194         // LAMESPEC: only documentated in ".NET Framework Security" book
 195         private const string urlX509Data = urlXmlDsig + " X509Data";                    // space is required
 196         private const string urlKeyName = urlXmlDsig + " KeyName";                      // space is required
 197         private const string urlKeyValueDSA = urlXmlDsig + " KeyValue/DSAKeyValue";     // space is required
 198         private const string urlKeyValueRSA = urlXmlDsig + " KeyValue/RSAKeyValue";     // space is required
 199         private const string urlRetrievalMethod = urlXmlDsig + " RetrievalMethod";      // space is required
 200
 201         // new (2.0) X509 certificate extensions
 202         private const string oidX509SubjectKeyIdentifier = "2.5.29.14";
 203         private const string oidX509KeyUsage = "2.5.29.15";
 204         private const string oidX509BasicConstraints = "2.5.29.19";
 205         private const string oidX509EnhancedKeyUsage = "2.5.29.37";
 206
 207         private const string nameX509SubjectKeyIdentifier = defaultNamespace + "X509Certificates.X509SubjectKeyIdentifierExtension, " + Consts.AssemblySystem;
 208         private const string nameX509KeyUsage = defaultNamespace + "X509Certificates.X509KeyUsageExtension, " + Consts.AssemblySystem;
 209         private const string nameX509BasicConstraints = defaultNamespace + "X509Certificates.X509BasicConstraintsExtension, " + Consts.AssemblySystem;
 210         private const string nameX509EnhancedKeyUsage = defaultNamespace + "X509Certificates.X509EnhancedKeyUsageExtension, " + Consts.AssemblySystem;
 211
 212         // new (2.0) X509 Chain
 213         private const string nameX509Chain = "X509Chain";
 214         private const string defaultX509Chain = defaultNamespace + "X509Certificates.X509Chain, " + Consts.AssemblySystem;
 215
 216         static CryptoConfig ()
 217         {
 218                 // lock(this) is bad
 219                 // http://msdn.microsoft.com/library/en-us/dnaskdr/html/askgui06032003.asp?frame=true
 220                 lockObject = new object ();
 221         }
 222
 223         private static void Initialize ()
 224         {
 225                 Hashtable algorithms = new Hashtable (new CaseInsensitiveHashCodeProvider (), new CaseInsensitiveComparer ());
 226                 // see list @ http://msdn.microsoft.com/library/en-us/cpref/html/
 227                 // frlrfSystemSecurityCryptographyCryptoConfigClassTopic.asp
 228                 algorithms.Add (nameSHA1a, defaultSHA1);
 229                 algorithms.Add (nameSHA1b, defaultSHA1);
 230                 algorithms.Add (nameSHA1c, defaultSHA1);
 231                 algorithms.Add (nameSHA1d, defaultSHA1);
 232
 233                 algorithms.Add (nameMD5a, defaultMD5);
 234                 algorithms.Add (nameMD5b, defaultMD5);
 235
 236                 algorithms.Add (nameSHA256a, defaultSHA256);
 237                 algorithms.Add (nameSHA256b, defaultSHA256);
 238                 algorithms.Add (nameSHA256c, defaultSHA256);
 239
 240                 algorithms.Add (nameSHA384a, defaultSHA384);
 241                 algorithms.Add (nameSHA384b, defaultSHA384);
 242                 algorithms.Add (nameSHA384c, defaultSHA384);
 243
 244                 algorithms.Add (nameSHA512a, defaultSHA512);
 245                 algorithms.Add (nameSHA512b, defaultSHA512);
 246                 algorithms.Add (nameSHA512c, defaultSHA512);
 247
 248                 algorithms.Add (nameRSAa, defaultRSA);
 249                 algorithms.Add (nameRSAb, defaultRSA);
 250                 algorithms.Add (nameRSAc, defaultRSA);
 251
 252                 algorithms.Add (nameDSAa, defaultDSA);
 253                 algorithms.Add (nameDSAb, defaultDSA);
 254
 255                 algorithms.Add (nameDESa, defaultDES);
 256                 algorithms.Add (nameDESb, defaultDES);
 257
 258                 algorithms.Add (name3DESa, default3DES);
 259                 algorithms.Add (name3DESb, default3DES);
 260                 algorithms.Add (name3DESc, default3DES);
 261                 algorithms.Add (name3DESd, default3DES);
 262
 263                 algorithms.Add (nameRC2a, defaultRC2);
 264                 algorithms.Add (nameRC2b, defaultRC2);
 265
 266                 algorithms.Add (nameAESa, defaultAES);
 267                 algorithms.Add (nameAESb, defaultAES);
 268                 // LAMESPEC SymmetricAlgorithm documented as TripleDESCryptoServiceProvider
 269                 algorithms.Add (nameAESc, defaultAES);
 270
 271                 // LAMESPEC These names aren't documented but (hint) the classes also have
 272                 // static Create methods. So logically they should (and are) here.
 273                 algorithms.Add (nameRNGa, defaultRNG);
 274                 algorithms.Add (nameRNGb, defaultRNG);
 275                 algorithms.Add (nameKeyHasha, defaultHMAC);
 276                 algorithms.Add (nameHMACSHA1a, defaultHMAC);
 277                 algorithms.Add (nameHMACSHA1b, defaultHMAC);
 278                 algorithms.Add (nameMAC3DESa, defaultMAC3DES);
 279                 algorithms.Add (nameMAC3DESb, defaultMAC3DES);
 280                 algorithms.Add (nameRIPEMD160a, defaultRIPEMD160);
 281                 algorithms.Add (nameRIPEMD160b, defaultRIPEMD160);
 282                 algorithms.Add (nameRIPEMD160c, defaultRIPEMD160);
 283                 algorithms.Add (nameHMACb, defaultHMAC);
 284                 algorithms.Add (nameHMACMD5a, defaultHMACMD5);
 285                 algorithms.Add (nameHMACMD5b, defaultHMACMD5);
 286                 algorithms.Add (nameHMACRIPEMD160a, defaultHMACRIPEMD160);
 287                 algorithms.Add (nameHMACRIPEMD160b, defaultHMACRIPEMD160);
 288                 algorithms.Add (nameHMACSHA256a, defaultHMACSHA256);
 289                 algorithms.Add (nameHMACSHA256b, defaultHMACSHA256);
 290                 algorithms.Add (nameHMACSHA384a, defaultHMACSHA384);
 291                 algorithms.Add (nameHMACSHA384b, defaultHMACSHA384);
 292                 algorithms.Add (nameHMACSHA512a, defaultHMACSHA512);
 293                 algorithms.Add (nameHMACSHA512b, defaultHMACSHA512);
 294
 295                 // LAMESPEC These URLs aren't documented but (hint) installing the WSDK
 296                 // add some of the XMLDSIG urls into machine.config (and they make a LOT
 297                 // of sense for implementing XMLDSIG in System.Security.Cryptography.Xml)
 298                 algorithms.Add (urlDSASHA1, defaultDSASigDesc);
 299                 algorithms.Add (urlRSASHA1, defaultRSASigDesc);
 300                 algorithms.Add (urlSHA1, defaultSHA1);
 301                 algorithms.Add (urlC14N, defaultC14N);
 302                 algorithms.Add (urlC14NWithComments, defaultC14NWithComments);
 303                 algorithms.Add (urlBase64, defaultBase64);
 304                 algorithms.Add (urlXPath, defaultXPath);
 305                 algorithms.Add (urlXslt, defaultXslt);
 306                 algorithms.Add (urlEnveloped, defaultEnveloped);
 307                 algorithms.Add (urlExcC14N, defaultExcC14N);
 308                 algorithms.Add (urlExcC14NWithComments, defaultExcC14NWithComments);
 309                 algorithms.Add (urlXmlDecryption, defaultXmlDecryption);
 310                 algorithms.Add (urlSHA256, defaultSHA256);
 311                 // xmlenc does not include a definition for SHA384
 312                 algorithms.Add (urlSHA512, defaultSHA512);
 313                 algorithms.Add (urlHMACSHA256, defaultHMACSHA256);
 314                 algorithms.Add (urlHMACSHA384, defaultHMACSHA384);
 315                 algorithms.Add (urlHMACSHA512, defaultHMACSHA512);
 316                 algorithms.Add (urlHMACRIPEMD160, defaultHMACRIPEMD160);
 317                 // LAMESPEC: only documentated in ".NET Framework Security" book
 318                 algorithms.Add (urlX509Data, defaultX509Data);
 319                 algorithms.Add (urlKeyName, defaultKeyName);
 320                 algorithms.Add (urlKeyValueDSA, defaultKeyValueDSA);
 321                 algorithms.Add (urlKeyValueRSA, defaultKeyValueRSA);
 322                 algorithms.Add (urlRetrievalMethod, defaultRetrievalMethod);
 323
 324                 // note: X.509 extensions aren't part of OID but names
 325                 algorithms.Add (oidX509SubjectKeyIdentifier, nameX509SubjectKeyIdentifier);
 326                 algorithms.Add (oidX509KeyUsage, nameX509KeyUsage);
 327                 algorithms.Add (oidX509BasicConstraints, nameX509BasicConstraints);
 328                 algorithms.Add (oidX509EnhancedKeyUsage, nameX509EnhancedKeyUsage);
 329                 // note: the default X.509Chain can also be created this way
 330                 algorithms.Add (nameX509Chain, defaultX509Chain);
 331
 332                 Hashtable oid = new Hashtable (new CaseInsensitiveHashCodeProvider (), new CaseInsensitiveComparer ());
 333
 334                 // comments here are to match with MS implementation (but not with doc)
 335                 // LAMESPEC: only HashAlgorithm seems to have their OID included
 336                 oid.Add (defaultSHA1, oidSHA1);
 337                 oid.Add (managedSHA1, oidSHA1);
 338                 oid.Add (nameSHA1b, oidSHA1);
 339                 oid.Add (nameSHA1c, oidSHA1);
 340
 341                 oid.Add (defaultMD5, oidMD5);
 342                 oid.Add (nameMD5a, oidMD5);
 343                 oid.Add (nameMD5b, oidMD5);
 344
 345                 oid.Add (defaultSHA256, oidSHA256);
 346                 oid.Add (nameSHA256a, oidSHA256);
 347                 oid.Add (nameSHA256c, oidSHA256);
 348
 349                 oid.Add (defaultSHA384, oidSHA384);
 350                 oid.Add (nameSHA384a, oidSHA384);
 351                 oid.Add (nameSHA384c, oidSHA384);
 352
 353                 oid.Add (defaultSHA512, oidSHA512);
 354                 oid.Add (nameSHA512a, oidSHA512);
 355                 oid.Add (nameSHA512c, oidSHA512);
 356
 357                 // surprise! documented in ".NET Framework Security" book
 358                 oid.Add (name3DESKeyWrap, oid3DESKeyWrap);
 359
 360                 oid.Add (nameDESa, oidDES);
 361                 oid.Add (name3DESb, oid3DES);
 362                 oid.Add (nameRC2a, oidRC2);
 363
 364                 // Add/modify the config as specified by machine.config
 365                 string config = Environment.GetMachineConfigPath ();
 366                 LoadConfig (config, algorithms, oid);
 367
 368                 // update
 369                 CryptoConfig.algorithms = algorithms;
 370                 CryptoConfig.oid = oid;
 371         }
 372
 373         [FileIOPermission (SecurityAction.Assert, Unrestricted = true)]
 374         private static void LoadConfig (string filename, Hashtable algorithms, Hashtable oid)
 375         {
 376                 if (!File.Exists (filename))
 377                         return;
 378
 379                 try {
 380                         using (TextReader reader = new StreamReader (filename)) {
 381                                 CryptoHandler handler = new CryptoHandler (algorithms, oid);
 382                                 SmallXmlParser parser = new SmallXmlParser ();
 383                                 parser.Parse (reader, handler);
 384                         }
 385                 }
 386                 catch {
 387                 }
 388         }
 389
 390         public static object CreateFromName (string name)
 391         {
 392                 return CreateFromName (name, null);
 393         }
 394
 395         [PermissionSet (SecurityAction.LinkDemand, Unrestricted = true)]
 396         public static object CreateFromName (string name, params object[] args)
 397         {
 398                 if (name == null)
 399                         throw new ArgumentNullException ("name");
 400
 401                 lock (lockObject) {
 402                         if (algorithms == null) {
 403                                 Initialize ();
 404                         }
 405                 }
 406
 407                 try {
 408                         Type algoClass = null;
 409                         string algo = (string) algorithms [name];
 410                         // do we have an entry
 411                         if (algo == null)
 412                                 algo = name;
 413                         algoClass = Type.GetType (algo);
 414                         // call the constructor for the type
 415                         return Activator.CreateInstance (algoClass, args);
 416                 }
 417                 catch {
 418                         // method doesn't throw any exception
 419                         return null;
 420                 }
 421         }
 422
 423         public static string MapNameToOID (string name)
 424         {
 425                 if (name == null)
 426                         throw new ArgumentNullException ("name");
 427
 428                 lock (lockObject) {
 429                         if (oid == null) {
 430                                 Initialize ();
 431                         }
 432                 }
 433
 434                 return (string)oid [name];
 435         }
 436
 437         class CryptoHandler: SmallXmlParser.IContentHandler {
 438
 439                 private Hashtable algorithms;
 440                 private Hashtable oid;
 441                 private Hashtable names;
 442                 private Hashtable classnames;
 443                 int level;
 444
 445                 public CryptoHandler (Hashtable algorithms, Hashtable oid)
 446                 {
 447                         this.algorithms = algorithms;
 448                         this.oid = oid;
 449                         // temporary tables to reconstruct algorithms
 450                         names = new Hashtable ();
 451                         classnames = new Hashtable ();
 452                 }
 453
 454                 public void OnStartParsing (SmallXmlParser parser)
 455                 {
 456                         // don't care
 457                 }
 458
 459                 public void OnEndParsing (SmallXmlParser parser)
 460                 {
 461                         foreach (DictionaryEntry de in names) {
 462                                 try {
 463                                         algorithms.Add (de.Key, classnames[de.Value]);
 464                                 }
 465                                 catch {
 466                                 }
 467                         }
 468                         // matching is done, data no more required
 469                         names.Clear ();
 470                         classnames.Clear ();
 471                 }
 472
 473                 private string Get (SmallXmlParser.IAttrList attrs, string name)
 474                 {
 475                         for (int i = 0; i < attrs.Names.Length; i++) {
 476                                 if (attrs.Names[i] == name)
 477                                         return attrs.Values[i];
 478                         }
 479                         return String.Empty;
 480                 }
 481
 482                 public void OnStartElement (string name, SmallXmlParser.IAttrList attrs)
 483                 {
 484                         switch (level) {
 485                         case 0:
 486                                 if (name == "configuration")
 487                                         level++;
 488                                 break;
 489                         case 1:
 490                                 if (name == "mscorlib")
 491                                         level++;
 492                                 break;
 493                         case 2:
 494                                 if (name == "cryptographySettings")
 495                                         level++;
 496                                 break;
 497                         case 3:
 498                                 if (name == "oidMap")
 499                                         level++;
 500                                 else if (name == "cryptoNameMapping")
 501                                         level++;
 502                                 break;
 503                         case 4:
 504                                 if (name == "oidEntry") {
 505                                         oid.Add (Get (attrs, "name"), Get (attrs, "OID"));
 506                                 } else if (name == "nameEntry") {
 507                                         names.Add (Get (attrs, "name"), Get (attrs, "class"));
 508                                 } else if (name == "cryptoClasses") {
 509                                         level++;
 510                                 }
 511                                 break;
 512                         case 5:
 513                                 if (name == "cryptoClass")
 514                                         classnames.Add (attrs.Names[0], attrs.Values[0]);
 515                                 break;
 516                         }
 517                 }
 518
 519                 public void OnEndElement (string name)
 520                 {
 521                         // parser will make sure the XML structure is respected
 522                         switch (level) {
 523                         case 1:
 524                                 if (name == "configuration")
 525                                         level--;
 526                                 break;
 527                         case 2:
 528                                 if (name == "mscorlib")
 529                                         level--;
 530                                 break;
 531                         case 3:
 532                                 if (name == "cryptographySettings")
 533                                         level--;
 534                                 break;
 535                         case 4:
 536                                 if ((name == "oidMap") || (name == "cryptoNameMapping"))
 537                                         level--;
 538                                 break;
 539                         case 5:
 540                                 if (name == "cryptoClasses")
 541                                         level--;
 542                                 break;
 543                         }
 544                 }
 545
 546                 public void OnProcessingInstruction (string name, string text)
 547                 {
 548                         // don't care
 549                 }
 550
 551                 public void OnChars (string text)
 552                 {
 553                         // don't care
 554                 }
 555
 556                 public void OnIgnorableWhitespace (string text)
 557                 {
 558                         // don't care
 559                 }
 560         }
 561 }
 562 }
 563
 564 #endif
 565