mcs/class/System/System.Security.Cryptography.X509Certificates/X509Certificate2ImplMono.cs

   1 //
   2 // X509Certificate2ImplMono
   3 //
   4 // Authors:
   5 //      Sebastien Pouliot  <sebastien@xamarin.com>
   6 //      Martin Baulig  <martin.baulig@xamarin.com>
   7 //
   8 // (C) 2003 Motus Technologies Inc. (http://www.motus.com)
   9 // Copyright (C) 2004-2006 Novell Inc. (http://www.novell.com)
  10 // Copyright (C) 2015-2016 Xamarin, Inc. (http://www.xamarin.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 SECURITY_DEP
  33
  34 #if MONO_SECURITY_ALIAS
  35 extern alias MonoSecurity;
  36 using MonoSecurity::Mono.Security;
  37 using MonoSecurity::Mono.Security.Cryptography;
  38 using MX = MonoSecurity::Mono.Security.X509;
  39 #else
  40 using Mono.Security;
  41 using Mono.Security.Cryptography;
  42 using MX = Mono.Security.X509;
  43 #endif
  44
  45 using System.IO;
  46 using System.Text;
  47 using System.Collections;
  48
  49 namespace System.Security.Cryptography.X509Certificates
  50 {
  51         internal class X509Certificate2ImplMono : X509Certificate2Impl
  52         {
  53                 bool _archived;
  54                 X509ExtensionCollection _extensions;
  55                 string _serial;
  56                 PublicKey _publicKey;
  57                 X500DistinguishedName issuer_name;
  58                 X500DistinguishedName subject_name;
  59                 Oid signature_algorithm;
  60
  61                 MX.X509Certificate _cert;
  62
  63                 static string empty_error = Locale.GetText ("Certificate instance is empty.");
  64
  65                 public override bool IsValid {
  66                         get {
  67                                 return _cert != null;
  68                         }
  69                 }
  70
  71                 public override IntPtr Handle {
  72                         get { return IntPtr.Zero; }
  73                 }
  74
  75                 internal X509Certificate2ImplMono (MX.X509Certificate cert)
  76                 {
  77                         this._cert = cert;
  78                 }
  79
  80                 public override X509CertificateImpl Clone ()
  81                 {
  82                         ThrowIfContextInvalid ();
  83                         return new X509Certificate2ImplMono (_cert);
  84                 }
  85
  86                 #region Implemented X509CertificateImpl members
  87
  88                 public override string GetIssuerName (bool legacyV1Mode)
  89                 {
  90                         ThrowIfContextInvalid ();
  91                         if (legacyV1Mode)
  92                                 return _cert.IssuerName;
  93                         else
  94                                 return MX.X501.ToString (_cert.GetIssuerName (), true, ", ", true);
  95                 }
  96
  97                 public override string GetSubjectName (bool legacyV1Mode)
  98                 {
  99                         ThrowIfContextInvalid ();
 100                         if (legacyV1Mode)
 101                                 return _cert.SubjectName;
 102                         else
 103                                 return MX.X501.ToString (_cert.GetSubjectName (), true, ", ", true);
 104                 }
 105
 106                 public override byte[] GetRawCertData ()
 107                 {
 108                         ThrowIfContextInvalid ();
 109                         return _cert.RawData;
 110                 }
 111
 112                 protected override byte[] GetCertHash (bool lazy)
 113                 {
 114                         ThrowIfContextInvalid ();
 115                         SHA1 sha = SHA1.Create ();
 116                         return sha.ComputeHash (_cert.RawData);
 117                 }
 118
 119                 public override DateTime GetValidFrom ()
 120                 {
 121                         ThrowIfContextInvalid ();
 122                         return _cert.ValidFrom;
 123                 }
 124
 125                 public override DateTime GetValidUntil ()
 126                 {
 127                         ThrowIfContextInvalid ();
 128                         return _cert.ValidUntil;
 129                 }
 130
 131                 public override bool Equals (X509CertificateImpl other, out bool result)
 132                 {
 133                         // Use default implementation
 134                         result = false;
 135                         return false;
 136                 }
 137
 138                 public override string GetKeyAlgorithm ()
 139                 {
 140                         ThrowIfContextInvalid ();
 141                         return _cert.KeyAlgorithm;
 142                 }
 143
 144                 public override byte[] GetKeyAlgorithmParameters ()
 145                 {
 146                         ThrowIfContextInvalid ();
 147                         return _cert.KeyAlgorithmParameters;
 148                 }
 149
 150                 public override byte[] GetPublicKey ()
 151                 {
 152                         ThrowIfContextInvalid ();
 153                         return _cert.PublicKey;
 154                 }
 155
 156                 public override byte[] GetSerialNumber ()
 157                 {
 158                         ThrowIfContextInvalid ();
 159                         return _cert.SerialNumber;
 160                 }
 161
 162                 public override byte[] Export (X509ContentType contentType, byte[] password)
 163                 {
 164                         ThrowIfContextInvalid ();
 165
 166                         switch (contentType) {
 167                         case X509ContentType.Cert:
 168                                 return GetRawCertData ();
 169                         case X509ContentType.Pfx: // this includes Pkcs12
 170                                 // TODO
 171                                 throw new NotSupportedException ();
 172                         case X509ContentType.SerializedCert:
 173                                 // TODO
 174                                 throw new NotSupportedException ();
 175                         default:
 176                                 string msg = Locale.GetText ("This certificate format '{0}' cannot be exported.", contentType);
 177                                 throw new CryptographicException (msg);
 178                         }
 179                 }
 180
 181                 #endregion
 182
 183                 // constructors
 184
 185                 public X509Certificate2ImplMono ()
 186                 {
 187                         _cert = null;
 188                 }
 189
 190                 // properties
 191
 192                 public override bool Archived {
 193                         get {
 194                                 if (_cert == null)
 195                                         throw new CryptographicException (empty_error);
 196                                 return _archived;
 197                         }
 198                         set {
 199                                 if (_cert == null)
 200                                         throw new CryptographicException (empty_error);
 201                                 _archived = value;
 202                         }
 203                 }
 204
 205                 public override X509ExtensionCollection Extensions {
 206                         get {
 207                                 if (_cert == null)
 208                                         throw new CryptographicException (empty_error);
 209                                 if (_extensions == null)
 210                                         _extensions = new X509ExtensionCollection (_cert);
 211                                 return _extensions;
 212                         }
 213                 }
 214
 215                 // FIXME - Could be more efficient
 216                 public override bool HasPrivateKey {
 217                         get { return PrivateKey != null; }
 218                 }
 219
 220                 public override X500DistinguishedName IssuerName {
 221                         get {
 222                                 if (_cert == null)
 223                                         throw new CryptographicException (empty_error);
 224                                 if (issuer_name == null)
 225                                         issuer_name = new X500DistinguishedName (_cert.GetIssuerName ().GetBytes ());
 226                                 return issuer_name;
 227                         }
 228                 }
 229
 230                 public override AsymmetricAlgorithm PrivateKey {
 231                         get {
 232                                 if (_cert == null)
 233                                         throw new CryptographicException (empty_error);
 234                                 try {
 235                                         if (_cert.RSA != null) {
 236                                                 RSACryptoServiceProvider rcsp = _cert.RSA as RSACryptoServiceProvider;
 237                                                 if (rcsp != null)
 238                                                         return rcsp.PublicOnly ? null : rcsp;
 239
 240                                                 RSAManaged rsam = _cert.RSA as RSAManaged;
 241                                                 if (rsam != null)
 242                                                         return rsam.PublicOnly ? null : rsam;
 243
 244                                                 _cert.RSA.ExportParameters (true);
 245                                                 return _cert.RSA;
 246                                         } else if (_cert.DSA != null) {
 247                                                 DSACryptoServiceProvider dcsp = _cert.DSA as DSACryptoServiceProvider;
 248                                                 if (dcsp != null)
 249                                                         return dcsp.PublicOnly ? null : dcsp;
 250
 251                                                 _cert.DSA.ExportParameters (true);
 252                                                 return _cert.DSA;
 253                                         }
 254                                 }
 255                                 catch {
 256                                 }
 257                                 return null;
 258                         }
 259                         set {
 260                                 if (_cert == null)
 261                                         throw new CryptographicException (empty_error);
 262
 263                                 // allow NULL so we can "forget" the key associated to the certificate
 264                                 // e.g. in case we want to export it in another format (see bug #396620)
 265                                 if (value == null) {
 266                                         _cert.RSA = null;
 267                                         _cert.DSA = null;
 268                                 } else  if (value is RSA)
 269                                         _cert.RSA = (RSA) value;
 270                                 else if (value is DSA)
 271                                         _cert.DSA = (DSA) value;
 272                                 else
 273                                         throw new NotSupportedException ();
 274                         }
 275                 }
 276
 277                 public override PublicKey PublicKey {
 278                         get {
 279                                 if (_cert == null)
 280                                         throw new CryptographicException (empty_error);
 281
 282                                 if (_publicKey == null) {
 283                                         try {
 284                                                 _publicKey = new PublicKey (_cert);
 285                                         }
 286                                         catch (Exception e) {
 287                                                 string msg = Locale.GetText ("Unable to decode public key.");
 288                                                 throw new CryptographicException (msg, e);
 289                                         }
 290                                 }
 291                                 return _publicKey;
 292                         }
 293                 }
 294
 295                 public override Oid SignatureAlgorithm {
 296                         get {
 297                                 if (_cert == null)
 298                                         throw new CryptographicException (empty_error);
 299
 300                                 if (signature_algorithm == null)
 301                                         signature_algorithm = new Oid (_cert.SignatureAlgorithm);
 302                                 return signature_algorithm;
 303                         }
 304                 }
 305
 306                 public override X500DistinguishedName SubjectName {
 307                         get {
 308                                 if (_cert == null)
 309                                         throw new CryptographicException (empty_error);
 310
 311                                 if (subject_name == null)
 312                                         subject_name = new X500DistinguishedName (_cert.GetSubjectName ().GetBytes ());
 313                                 return subject_name;
 314                         }
 315                 }
 316
 317                 public override int Version {
 318                         get {
 319                                 if (_cert == null)
 320                                         throw new CryptographicException (empty_error);
 321                                 return _cert.Version;
 322                         }
 323                 }
 324
 325                 // methods
 326
 327                 [MonoTODO ("always return String.Empty for UpnName, DnsFromAlternativeName and UrlName")]
 328                 public override string GetNameInfo (X509NameType nameType, bool forIssuer)
 329                 {
 330                         switch (nameType) {
 331                         case X509NameType.SimpleName:
 332                                 if (_cert == null)
 333                                         throw new CryptographicException (empty_error);
 334                                 // return CN= or, if missing, the first part of the DN
 335                                 ASN1 sn = forIssuer ? _cert.GetIssuerName () : _cert.GetSubjectName ();
 336                                 ASN1 dn = Find (commonName, sn);
 337                                 if (dn != null)
 338                                         return GetValueAsString (dn);
 339                                 if (sn.Count == 0)
 340                                         return String.Empty;
 341                                 ASN1 last_entry = sn [sn.Count - 1];
 342                                 if (last_entry.Count == 0)
 343                                         return String.Empty;
 344                                 return GetValueAsString (last_entry [0]);
 345                         case X509NameType.EmailName:
 346                                 // return the E= part of the DN (if present)
 347                                 ASN1 e = Find (email, forIssuer ? _cert.GetIssuerName () : _cert.GetSubjectName ());
 348                                 if (e != null)
 349                                         return GetValueAsString (e);
 350                                 return String.Empty;
 351                         case X509NameType.UpnName:
 352                                 // FIXME - must find/create test case
 353                                 return String.Empty;
 354                         case X509NameType.DnsName:
 355                                 // return the CN= part of the DN (if present)
 356                                 ASN1 cn = Find (commonName, forIssuer ? _cert.GetIssuerName () : _cert.GetSubjectName ());
 357                                 if (cn != null)
 358                                         return GetValueAsString (cn);
 359                                 return String.Empty;
 360                         case X509NameType.DnsFromAlternativeName:
 361                                 // FIXME - must find/create test case
 362                                 return String.Empty;
 363                         case X509NameType.UrlName:
 364                                 // FIXME - must find/create test case
 365                                 return String.Empty;
 366                         default:
 367                                 throw new ArgumentException ("nameType");
 368                         }
 369                 }
 370
 371                 static byte[] commonName = { 0x55, 0x04, 0x03 };
 372                 static byte[] email = { 0x2a, 0x86, 0x48, 0x86, 0xf7, 0x0d, 0x01, 0x09, 0x01 };
 373
 374                 private ASN1 Find (byte[] oid, ASN1 dn)
 375                 {
 376                         if (dn.Count == 0)
 377                                 return null;
 378
 379                         // process SET
 380                         for (int i = 0; i < dn.Count; i++) {
 381                                 ASN1 set = dn [i];
 382                                 for (int j = 0; j < set.Count; j++) {
 383                                         ASN1 pair = set [j];
 384                                         if (pair.Count != 2)
 385                                                 continue;
 386
 387                                         ASN1 poid = pair [0];
 388                                         if (poid == null)
 389                                                 continue;
 390
 391                                         if (poid.CompareValue (oid))
 392                                                 return pair;
 393                                 }
 394                         }
 395                         return null;
 396                 }
 397
 398                 private string GetValueAsString (ASN1 pair)
 399                 {
 400                         if (pair.Count != 2)
 401                                 return String.Empty;
 402
 403                         ASN1 value = pair [1];
 404                         if ((value.Value == null) || (value.Length == 0))
 405                                 return String.Empty;
 406
 407                         if (value.Tag == 0x1E) {
 408                                 // BMPSTRING
 409                                 StringBuilder sb = new StringBuilder ();
 410                                 for (int j = 1; j < value.Value.Length; j += 2)
 411                                         sb.Append ((char)value.Value [j]);
 412                                 return sb.ToString ();
 413                         } else {
 414                                 return Encoding.UTF8.GetString (value.Value);
 415                         }
 416                 }
 417
 418                 private MX.X509Certificate ImportPkcs12 (byte[] rawData, string password)
 419                 {
 420                         MX.PKCS12 pfx = null;
 421                         if (string.IsNullOrEmpty (password)) {
 422                                 try {
 423                                         // Support both unencrypted PKCS#12..
 424                                         pfx = new MX.PKCS12 (rawData, (string)null);
 425                                 } catch {
 426                                         // ..and PKCS#12 encrypted with an empty password
 427                                         pfx = new MX.PKCS12 (rawData, string.Empty);
 428                                 }
 429                         } else {
 430                                 pfx = new MX.PKCS12 (rawData, password);
 431                         }
 432
 433                         if (pfx.Certificates.Count == 0) {
 434                                 // no certificate was found
 435                                 return null;
 436                         } else if (pfx.Keys.Count == 0) {
 437                                 // no key were found - pick the first certificate
 438                                 return pfx.Certificates [0];
 439                         } else {
 440                                 // find the certificate that match the first key
 441                                 MX.X509Certificate cert = null;
 442                                 var keypair = (pfx.Keys [0] as AsymmetricAlgorithm);
 443                                 string pubkey = keypair.ToXmlString (false);
 444                                 foreach (var c in pfx.Certificates) {
 445                                         if (((c.RSA != null) && (pubkey == c.RSA.ToXmlString (false))) ||
 446                                                 ((c.DSA != null) && (pubkey == c.DSA.ToXmlString (false)))) {
 447                                                 cert = c;
 448                                                 break;
 449                                         }
 450                                 }
 451                                 if (cert == null) {
 452                                         cert = pfx.Certificates [0]; // no match, pick first certificate without keys
 453                                 } else {
 454                                         cert.RSA = (keypair as RSA);
 455                                         cert.DSA = (keypair as DSA);
 456                                 }
 457                                 return cert;
 458                         }
 459                 }
 460
 461                 [MonoTODO ("missing KeyStorageFlags support")]
 462                 public override void Import (byte[] rawData, string password, X509KeyStorageFlags keyStorageFlags)
 463                 {
 464                         MX.X509Certificate cert = null;
 465                         if (password == null) {
 466                                 try {
 467                                         cert = new MX.X509Certificate (rawData);
 468                                 }
 469                                 catch (Exception e) {
 470                                         try {
 471                                                 cert = ImportPkcs12 (rawData, null);
 472                                         }
 473                                         catch {
 474                                                 string msg = Locale.GetText ("Unable to decode certificate.");
 475                                                 // inner exception is the original (not second) exception
 476                                                 throw new CryptographicException (msg, e);
 477                                         }
 478                                 }
 479                         } else {
 480                                 // try PKCS#12
 481                                 try {
 482                                         cert = ImportPkcs12 (rawData, password);
 483                                 }
 484                                 catch {
 485                                         // it's possible to supply a (unrequired/unusued) password
 486                                         // fix bug #79028
 487                                         cert = new MX.X509Certificate (rawData);
 488                                 }
 489                         }
 490                         _cert = cert;
 491                 }
 492
 493                 [MonoTODO ("X509ContentType.SerializedCert is not supported")]
 494                 public override byte[] Export (X509ContentType contentType, string password)
 495                 {
 496                         if (_cert == null)
 497                                 throw new CryptographicException (empty_error);
 498
 499                         switch (contentType) {
 500                         case X509ContentType.Cert:
 501                                 return _cert.RawData;
 502                         case X509ContentType.Pfx: // this includes Pkcs12
 503                                 return ExportPkcs12 (password);
 504                         case X509ContentType.SerializedCert:
 505                                 // TODO
 506                                 throw new NotSupportedException ();
 507                         default:
 508                                 string msg = Locale.GetText ("This certificate format '{0}' cannot be exported.", contentType);
 509                                 throw new CryptographicException (msg);
 510                         }
 511                 }
 512
 513                 byte[] ExportPkcs12 (string password)
 514                 {
 515                         var pfx = new MX.PKCS12 ();
 516                         try {
 517                                 var attrs = new Hashtable ();
 518                                 var localKeyId = new ArrayList ();
 519                                 localKeyId.Add (new byte[] { 1, 0, 0, 0 });
 520                                 attrs.Add (MX.PKCS9.localKeyId, localKeyId);
 521
 522                                 if (password != null)
 523                                         pfx.Password = password;
 524                                 pfx.AddCertificate (_cert, attrs);
 525                                 var privateKey = PrivateKey;
 526                                 if (privateKey != null)
 527                                         pfx.AddPkcs8ShroudedKeyBag (privateKey, attrs);
 528                                 return pfx.GetBytes ();
 529                         } finally {
 530                                 pfx.Password = null;
 531                         }
 532                 }
 533
 534                 public override void Reset ()
 535                 {
 536                         _cert = null;
 537                         _archived = false;
 538                         _extensions = null;
 539                         _serial = null;
 540                         _publicKey = null;
 541                         issuer_name = null;
 542                         subject_name = null;
 543                         signature_algorithm = null;
 544                 }
 545
 546                 public override string ToString ()
 547                 {
 548                         if (_cert == null)
 549                                 return "System.Security.Cryptography.X509Certificates.X509Certificate2";
 550
 551                         return ToString (true);
 552                 }
 553
 554                 public override string ToString (bool verbose)
 555                 {
 556                         if (_cert == null)
 557                                 return "System.Security.Cryptography.X509Certificates.X509Certificate2";
 558
 559                         string nl = Environment.NewLine;
 560                         StringBuilder sb = new StringBuilder ();
 561
 562                         // the non-verbose X509Certificate2 == verbose X509Certificate
 563                         if (!verbose) {
 564                                 sb.AppendFormat ("[Subject]{0}  {1}{0}{0}", nl, GetSubjectName (false));
 565                                 sb.AppendFormat ("[Issuer]{0}  {1}{0}{0}", nl, GetIssuerName (false));
 566                                 sb.AppendFormat ("[Not Before]{0}  {1}{0}{0}", nl, GetValidFrom ().ToLocalTime ());
 567                                 sb.AppendFormat ("[Not After]{0}  {1}{0}{0}", nl, GetValidUntil ().ToLocalTime ());
 568                                 sb.AppendFormat ("[Thumbprint]{0}  {1}{0}", nl, X509Helper.ToHexString (GetCertHash ()));
 569                                 sb.Append (nl);
 570                                 return sb.ToString ();
 571                         }
 572
 573                         sb.AppendFormat ("[Version]{0}  V{1}{0}{0}", nl, Version);
 574                         sb.AppendFormat ("[Subject]{0}  {1}{0}{0}", nl, GetSubjectName (false));
 575                         sb.AppendFormat ("[Issuer]{0}  {1}{0}{0}", nl, GetIssuerName (false));
 576                         sb.AppendFormat ("[Serial Number]{0}  {1}{0}{0}", nl, GetSerialNumber ());
 577                         sb.AppendFormat ("[Not Before]{0}  {1}{0}{0}", nl, GetValidFrom ().ToLocalTime ());
 578                         sb.AppendFormat ("[Not After]{0}  {1}{0}{0}", nl, GetValidUntil ().ToLocalTime ());
 579                         sb.AppendFormat ("[Thumbprint]{0}  {1}{0}", nl, X509Helper.ToHexString (GetCertHash ()));
 580                         sb.AppendFormat ("[Signature Algorithm]{0}  {1}({2}){0}{0}", nl, SignatureAlgorithm.FriendlyName,
 581                                 SignatureAlgorithm.Value);
 582
 583                         AsymmetricAlgorithm key = PublicKey.Key;
 584                         sb.AppendFormat ("[Public Key]{0}  Algorithm: ", nl);
 585                         if (key is RSA)
 586                                 sb.Append ("RSA");
 587                         else if (key is DSA)
 588                                 sb.Append ("DSA");
 589                         else
 590                                 sb.Append (key.ToString ());
 591                         sb.AppendFormat ("{0}  Length: {1}{0}  Key Blob: ", nl, key.KeySize);
 592                         AppendBuffer (sb, PublicKey.EncodedKeyValue.RawData);
 593                         sb.AppendFormat ("{0}  Parameters: ", nl);
 594                         AppendBuffer (sb, PublicKey.EncodedParameters.RawData);
 595                         sb.Append (nl);
 596
 597                         return sb.ToString ();
 598                 }
 599
 600                 private static void AppendBuffer (StringBuilder sb, byte[] buffer)
 601                 {
 602                         if (buffer == null)
 603                                 return;
 604                         for (int i=0; i < buffer.Length; i++) {
 605                                 sb.Append (buffer [i].ToString ("x2"));
 606                                 if (i < buffer.Length - 1)
 607                                         sb.Append (" ");
 608                         }
 609                 }
 610
 611                 [MonoTODO ("by default this depends on the incomplete X509Chain")]
 612                 public override bool Verify (X509Certificate2 thisCertificate)
 613                 {
 614                         if (_cert == null)
 615                                 throw new CryptographicException (empty_error);
 616
 617                         X509Chain chain = X509Chain.Create ();
 618                         if (!chain.Build (thisCertificate))
 619                                 return false;
 620                         // TODO - check chain and other stuff ???
 621                         return true;
 622                 }
 623
 624                 // static methods
 625
 626                 private static byte[] signedData = new byte[] { 0x2a, 0x86, 0x48, 0x86, 0xf7, 0x0d, 0x01, 0x07, 0x02 };
 627
 628                 [MonoTODO ("Detection limited to Cert, Pfx, Pkcs12, Pkcs7 and Unknown")]
 629                 public static X509ContentType GetCertContentType (byte[] rawData)
 630                 {
 631                         if ((rawData == null) || (rawData.Length == 0))
 632                                 throw new ArgumentException ("rawData");
 633
 634                         X509ContentType type = X509ContentType.Unknown;
 635                         try {
 636                                 ASN1 data = new ASN1 (rawData);
 637                                 if (data.Tag != 0x30) {
 638                                         string msg = Locale.GetText ("Unable to decode certificate.");
 639                                         throw new CryptographicException (msg);
 640                                 }
 641
 642                                 if (data.Count == 0)
 643                                         return type;
 644
 645                                 if (data.Count == 3) {
 646                                         switch (data [0].Tag) {
 647                                         case 0x30:
 648                                                 // SEQUENCE / SEQUENCE / BITSTRING
 649                                                 if ((data [1].Tag == 0x30) && (data [2].Tag == 0x03))
 650                                                         type = X509ContentType.Cert;
 651                                                 break;
 652                                         case 0x02:
 653                                                 // INTEGER / SEQUENCE / SEQUENCE
 654                                                 if ((data [1].Tag == 0x30) && (data [2].Tag == 0x30))
 655                                                         type = X509ContentType.Pkcs12;
 656                                                 // note: Pfx == Pkcs12
 657                                                 break;
 658                                         }
 659                                 }
 660                                 // check for PKCS#7 (count unknown but greater than 0)
 661                                 // SEQUENCE / OID (signedData)
 662                                 if ((data [0].Tag == 0x06) && data [0].CompareValue (signedData))
 663                                         type = X509ContentType.Pkcs7;
 664                         }
 665                         catch (Exception e) {
 666                                 string msg = Locale.GetText ("Unable to decode certificate.");
 667                                 throw new CryptographicException (msg, e);
 668                         }
 669
 670                         return type;
 671                 }
 672
 673                 [MonoTODO ("Detection limited to Cert, Pfx, Pkcs12 and Unknown")]
 674                 public static X509ContentType GetCertContentType (string fileName)
 675                 {
 676                         if (fileName == null)
 677                                 throw new ArgumentNullException ("fileName");
 678                         if (fileName.Length == 0)
 679                                 throw new ArgumentException ("fileName");
 680
 681                         byte[] data = File.ReadAllBytes (fileName);
 682                         return GetCertContentType (data);
 683                 }
 684
 685                 // internal stuff because X509Certificate2 isn't complete enough
 686                 // (maybe X509Certificate3 will be better?)
 687
 688                 internal MX.X509Certificate MonoCertificate {
 689                         get { return _cert; }
 690                 }
 691         }
 692 }
 693
 694 #endif