mcs/class/corlib/Test/System.Security.Cryptography/RSAPKCS1SignatureDeformatterTest.cs

   1 //
   2 // RSAPKCS1SignatureDeformatterTest.cs - NUnit tests for PKCS#1 v.1.5 signature.
   3 //
   4 // Author:
   5 //      Sebastien Pouliot (sebastien@ximian.com)
   6 //
   7 // (C) 2002, 2003 Motus Technologies Inc. (http://www.motus.com)
   8 // Copyright (C) 2004-2006 Novell, Inc (http://www.novell.com)
   9 //
  10
  11 using NUnit.Framework;
  12 using System;
  13 using System.Security.Cryptography;
  14 using System.Text;
  15
  16 namespace MonoTests.System.Security.Cryptography {
  17
  18         [TestFixture]
  19         public class RSAPKCS1SignatureDeformatterTest : Assertion {
  20
  21                 private static byte[] shaSignature = { 0x51, 0xE1, 0x69, 0xC4, 0x84, 0x0C, 0x33, 0xD9, 0x80, 0xC0, 0xBD, 0x85, 0x87, 0x6E, 0x85, 0x91, 0xB9, 0xD5, 0xB6, 0xE1, 0xAB, 0xD3, 0x06, 0x83, 0xCF, 0x33, 0x56, 0xB9, 0xE6, 0x2C, 0x37, 0xC0, 0x08, 0xFC, 0x81, 0x15, 0xAB, 0x57, 0x80, 0xE4, 0xB9, 0x95, 0x4B, 0xFA, 0x63, 0x13, 0x5E, 0xA9, 0x6E, 0xAB, 0xB0, 0x89, 0xF3, 0xD0, 0xE9, 0xC7, 0xE7, 0xA0, 0xE2, 0xB6, 0x0A, 0xFF, 0x46, 0x2B, 0x8B, 0xC1, 0x4C, 0xEA, 0xDB, 0xEA, 0xD6, 0xF5, 0xA5, 0x2C, 0x8C, 0x1D, 0x57, 0xDF, 0x2D, 0xF0, 0x6B, 0x1D, 0xA9, 0xAE, 0x7F, 0x10, 0x02, 0xE2, 0x05, 0x7E, 0xD2, 0x80, 0xFC, 0x0E, 0x5A, 0xFD, 0xE9, 0xDB, 0x1B, 0xBA, 0xB4, 0xF7, 0x50, 0x88, 0x73, 0x95, 0xBD, 0x3C, 0xCB, 0x33, 0x02, 0xF5, 0x55, 0x10, 0xA6, 0x1B, 0xFD, 0x1D, 0xB1, 0x0E, 0xE3, 0xD0, 0xB7, 0x14, 0x8D, 0x45, 0xC4, 0xF3 };
  22                 private static byte[] md5Signature = { 0xB4, 0xA9, 0xE9, 0x76, 0x04, 0x0E, 0x0E, 0x04, 0xA3, 0x68, 0x9E, 0x50, 0xD1, 0x29, 0x07, 0x22, 0x45, 0x41, 0x72, 0x1F, 0xBE, 0x74, 0x78, 0xDA, 0x5F, 0x22, 0x4B, 0x45, 0xA8, 0x5F, 0x2D, 0xA5, 0x5F, 0x01, 0x84, 0xA7, 0xF3, 0x6E, 0xB8, 0x8B, 0xF3, 0x29, 0xB2, 0x82, 0xE6, 0x5D, 0x1A, 0x98, 0xAE, 0x9C, 0x2E, 0xB0, 0xDD, 0x3F, 0x8D, 0xF9, 0x1C, 0x9E, 0x40, 0x25, 0x01, 0x9F, 0x92, 0x4E, 0xBE, 0x11, 0xE5, 0xE8, 0xE0, 0xF6, 0x3E, 0xDF, 0x8D, 0x1A, 0xC7, 0x26, 0x37, 0xF7, 0x01, 0x95, 0x48, 0xD8, 0x07, 0x4D, 0x0E, 0xDE, 0xB2, 0x76, 0xD1, 0x23, 0xBD, 0x74, 0xE9, 0xC3, 0x63, 0xB3, 0xE7, 0xCE, 0xA2, 0xEA, 0x20, 0x19, 0x1C, 0x4D, 0x8D, 0xBB, 0xAB, 0x6E, 0xB0, 0xD0, 0x08, 0xC2, 0x2B, 0x69, 0xA4, 0xF3, 0xE9, 0x23, 0xAC, 0x93, 0xB2, 0x0F, 0x90, 0x95, 0x6A, 0x66, 0xDC, 0x44 };
  23
  24                 private static RSA rsa;
  25                 private static DSA dsa;
  26
  27                 [SetUp]
  28                 public void SetUp ()
  29                 {
  30                         shaSignature [0] = 0x51;
  31                         md5Signature [0] = 0xB4;
  32
  33                         if (rsa == null)
  34                                 rsa = RSA.Create ();
  35                         if (dsa == null)
  36                                 dsa = DSA.Create ();
  37                 }
  38
  39                 public void AssertEquals (string msg, byte[] array1, byte[] array2)
  40                 {
  41                         AllTests.AssertEquals (msg, array1, array2);
  42                 }
  43
  44                 [Test]
  45                 public void RSAConstructors ()
  46                 {
  47                         RSAPKCS1SignatureDeformatter fmt;
  48                         fmt = new RSAPKCS1SignatureDeformatter ();
  49                         AssertNotNull ("RSAPKCS1SignatureDeformatter()", fmt);
  50
  51                         fmt = new RSAPKCS1SignatureDeformatter (rsa);
  52                         AssertNotNull ("RSAPKCS1SignatureDeformatter(rsa)", fmt);
  53                 }
  54
  55                 [Test]
  56 #if NET_2_0
  57                 [ExpectedException (typeof (ArgumentNullException))]
  58 #endif
  59                 public void RSAConstructor_Null ()
  60                 {
  61                         RSAPKCS1SignatureDeformatter fmt = new RSAPKCS1SignatureDeformatter (null);
  62                         AssertNotNull ("RSAPKCS1SignatureDeformatter(null)", fmt);
  63                 }
  64
  65                 [Test]
  66                 [ExpectedException (typeof (InvalidCastException))]
  67                 public void DSAConstructor ()
  68                 {
  69                         RSAPKCS1SignatureDeformatter fmt = new RSAPKCS1SignatureDeformatter (dsa);
  70                 }
  71
  72                 [Test]
  73                 public void SetRSAKey ()
  74                 {
  75                         RSAPKCS1SignatureDeformatter fmt = new RSAPKCS1SignatureDeformatter ();
  76                         fmt.SetKey (rsa);
  77                 }
  78
  79                 [Test]
  80                 [ExpectedException (typeof (InvalidCastException))]
  81                 public void SetDSAKey ()
  82                 {
  83                         RSAPKCS1SignatureDeformatter fmt = new RSAPKCS1SignatureDeformatter ();
  84                         fmt.SetKey (dsa);
  85                 }
  86
  87                 [Test]
  88 #if NET_2_0
  89                 [ExpectedException (typeof (ArgumentNullException))]
  90 #endif
  91                 public void SetNullKey ()
  92                 {
  93                         RSAPKCS1SignatureDeformatter fmt = new RSAPKCS1SignatureDeformatter ();
  94                         fmt.SetKey (null);
  95                 }
  96
  97                 [Test]
  98                 [ExpectedException (typeof (ArgumentNullException))]
  99                 public void SetNullHashAlgorithm ()
 100                 {
 101                         RSAPKCS1SignatureDeformatter fmt = new RSAPKCS1SignatureDeformatter ();
 102                         fmt.SetHashAlgorithm (null);
 103                 }
 104
 105                 [Test]
 106                 public void SetInvalidHashAlgorithm ()
 107                 {
 108                         RSAPKCS1SignatureDeformatter fmt = new RSAPKCS1SignatureDeformatter ();
 109                         fmt.SetHashAlgorithm ("MD3");
 110                 }
 111
 112                 [Test]
 113                 public void SetSHA1HashAlgorithm ()
 114                 {
 115                         RSAPKCS1SignatureDeformatter fmt = new RSAPKCS1SignatureDeformatter ();
 116                         fmt.SetHashAlgorithm ("SHA1");
 117                 }
 118
 119                 [Test]
 120                 public void SetMD5HashAlgorithm ()
 121                 {
 122                         RSAPKCS1SignatureDeformatter fmt = new RSAPKCS1SignatureDeformatter ();
 123                         fmt.SetHashAlgorithm ("MD5");
 124                 }
 125
 126                 [Test]
 127                 public void SetSHA256HashAlgorithm ()
 128                 {
 129                         RSAPKCS1SignatureDeformatter fmt = new RSAPKCS1SignatureDeformatter ();
 130                         fmt.SetHashAlgorithm ("SHA256");
 131                 }
 132
 133                 [Test]
 134                 public void SetSHA384HashAlgorithm ()
 135                 {
 136                         RSAPKCS1SignatureDeformatter fmt = new RSAPKCS1SignatureDeformatter ();
 137                         fmt.SetHashAlgorithm ("SHA384");
 138                 }
 139
 140                 [Test]
 141                 public void SetSHA512HashAlgorithm ()
 142                 {
 143                         RSAPKCS1SignatureDeformatter fmt = new RSAPKCS1SignatureDeformatter ();
 144                         fmt.SetHashAlgorithm ("SHA512");
 145                 }
 146
 147                 [Test]
 148                 [ExpectedException (typeof (ArgumentNullException))]
 149                 public void VerifySignatureNullHash ()
 150                 {
 151                         RSAPKCS1SignatureDeformatter fmt = new RSAPKCS1SignatureDeformatter ();
 152                         fmt.SetHashAlgorithm ("SHA1");
 153                         fmt.SetKey (rsa);
 154                         byte[] hash = null;
 155                         byte[] signature = new byte [128];
 156                         fmt.VerifySignature (hash, signature);
 157                 }
 158
 159                 [Test]
 160                 [ExpectedException (typeof (ArgumentNullException))]
 161                 public void VerifySignatureNullSignature ()
 162                 {
 163                         RSAPKCS1SignatureDeformatter fmt = new RSAPKCS1SignatureDeformatter ();
 164                         fmt.SetHashAlgorithm ("SHA1");
 165                         fmt.SetKey (rsa);
 166                         byte[] hash = new byte [20];
 167                         fmt.VerifySignature (hash, null);
 168                 }
 169
 170                 [Test]
 171                 [ExpectedException (typeof (CryptographicUnexpectedOperationException))]
 172                 public void VerifySignatureWithBadHash ()
 173                 {
 174                         RSAPKCS1SignatureDeformatter fmt = new RSAPKCS1SignatureDeformatter ();
 175                         fmt.SetKey (rsa);
 176                         // no hash algorithm
 177                         byte[] hash = new byte [1];
 178                         byte[] signature = new byte [1];
 179                         fmt.VerifySignature (hash, signature);
 180                 }
 181
 182                 [Test]
 183 // v.1.0        [ExpectedException (typeof (CryptographicUnexpectedOperationException))]
 184 // v.1.1        [ExpectedException (typeof (NullReferenceException))]
 185                 public void VerifySHA1SignatureWithNullKey ()
 186                 {
 187                         RSAPKCS1SignatureDeformatter fmt = new RSAPKCS1SignatureDeformatter ();
 188                         fmt.SetHashAlgorithm ("SHA1");
 189                         byte[] hash = new byte [20];
 190                         try {
 191                                 // no key
 192                                 fmt.VerifySignature (hash, shaSignature);
 193                                 Fail ("VerifySHA1SignatureWithNullKey - Expected CryptographicUnexpectedOperationException but none");
 194                         }
 195                         catch (CryptographicUnexpectedOperationException) {
 196                                 // this was expected
 197                         }
 198                         catch (NullReferenceException) {
 199                                 // this wasn't expected - but that's the result from framework 1.1
 200                         }
 201                         catch (Exception e) {
 202                                 Fail ("VerifySHA1SignatureWithNullKey - Expected CryptographicUnexpectedOperationException but got: " + e.ToString ());
 203                         }
 204                 }
 205
 206                 private RSAPKCS1SignatureDeformatter GetDefaultDeformatter (string hashName)
 207                 {
 208                         // no need for the private key
 209                         RSA rsa = RSA.Create ();
 210                         rsa.ImportParameters (AllTests.GetRsaKey (false));
 211
 212                         RSAPKCS1SignatureDeformatter fmt = new RSAPKCS1SignatureDeformatter ();
 213                         fmt.SetKey (rsa);
 214                         fmt.SetHashAlgorithm (hashName);
 215                         return fmt;
 216                 }
 217
 218                 [Test]
 219                 public void VerifySHA1SignatureWithRSAKey ()
 220                 {
 221                         RSAPKCS1SignatureDeformatter fmt = GetDefaultDeformatter ("SHA1");
 222                         // good SHA1
 223                         byte[] hash = new byte [20];
 224                         Assert ("VerifySignature(SHA1, sign)", fmt.VerifySignature (hash, shaSignature));
 225                         // bad signature
 226                         shaSignature [0] = (byte) ~shaSignature [0];
 227                         Assert ("VerifySignature(SHA1, badSign)", !fmt.VerifySignature (hash, shaSignature));
 228                 }
 229
 230                 [Test]
 231                 [ExpectedException (typeof (CryptographicException))]
 232                 public void VerifySHA1SignatureWithWrongHashLength ()
 233                 {
 234                         RSAPKCS1SignatureDeformatter fmt = GetDefaultDeformatter ("SHA1");
 235                         // wrong SHA1 length
 236                         byte[] hash = new byte [19];
 237                         fmt.VerifySignature (hash, shaSignature);
 238                 }
 239
 240                 [Test]
 241                 public void VerifySHA1SignatureWithWrongSignatureLength ()
 242                 {
 243                         RSAPKCS1SignatureDeformatter fmt = GetDefaultDeformatter ("SHA1");
 244                         // wrong signature length
 245                         byte[] hash = new byte [20];
 246                         byte[] badSignature = new byte [shaSignature.Length-1];
 247                         Assert ("VerifySignature(SHA1, badSign)", !fmt.VerifySignature (hash, badSignature));
 248                 }
 249
 250                 [Test]
 251                 public void VerifyMD5SignatureWithRSAKey ()
 252                 {
 253                         RSAPKCS1SignatureDeformatter fmt = GetDefaultDeformatter ("MD5");
 254                         // good MD5
 255                         byte[] hash = new byte [16];
 256                         Assert ("VerifySignature(MD5, sign)", fmt.VerifySignature (hash, md5Signature));
 257                         // bad signature
 258                         md5Signature [0] = (byte) ~md5Signature [0];
 259                         Assert ("VerifySignature(MD5, badSign)", !fmt.VerifySignature (hash, md5Signature));
 260                 }
 261
 262                 [Test]
 263                 [ExpectedException (typeof (CryptographicException))]
 264                 public void VerifyMD5SignatureWithWrongHashLength ()
 265                 {
 266                         RSAPKCS1SignatureDeformatter fmt = GetDefaultDeformatter ("MD5");
 267                         // wrong MD5 length
 268                         byte[] hash = new byte [17];
 269                         fmt.VerifySignature (hash, md5Signature);
 270                 }
 271
 272                 [Test]
 273                 public void VerifyMD5SignatureWithWrongSignatureLength ()
 274                 {
 275                         RSAPKCS1SignatureDeformatter fmt = GetDefaultDeformatter ("MD5");
 276                         // wrong signature length
 277                         byte[] hash = new byte [16];
 278                         byte[] badSignature = new byte [md5Signature.Length-1];
 279                         Assert ("VerifySignature(MD5, badSign)", !fmt.VerifySignature (hash, badSignature));
 280                 }
 281
 282                 [Test]
 283                 [ExpectedException (typeof (ArgumentNullException))]
 284                 public void VerifySignatureNullHashAlgorithm ()
 285                 {
 286                         RSAPKCS1SignatureDeformatter fmt = new RSAPKCS1SignatureDeformatter ();
 287                         HashAlgorithm hash = null;
 288                         byte[] data = new byte [20];
 289                         // no hash algorithm
 290                         byte[] signature = new byte [1];
 291                         fmt.VerifySignature (hash, signature);
 292                 }
 293
 294                 [Test]
 295 // v.1.0        [ExpectedException (typeof (CryptographicUnexpectedOperationException))]
 296 // v.1.1        [ExpectedException (typeof (NullReferenceException))]
 297                 public void VerifySignatureHashNoKey ()
 298                 {
 299                         RSAPKCS1SignatureDeformatter fmt = new RSAPKCS1SignatureDeformatter ();
 300                         HashAlgorithm hash = SHA1.Create ();
 301                         try {
 302                                 // no key
 303                                 fmt.VerifySignature (hash, shaSignature);
 304                                 Fail ("VerifySignatureHashNoKey - Expected CryptographicUnexpectedOperationException but none");
 305                         }
 306                         catch (CryptographicUnexpectedOperationException) {
 307                                 // this was expected
 308                         }
 309                         catch (NullReferenceException) {
 310                                 // this wasn't expected - but that's the result from framework 1.1
 311                         }
 312                         catch (Exception e) {
 313                                 Fail ("VerifySignatureHashNoKey - Expected CryptographicUnexpectedOperationException but got: " + e.ToString ());
 314                         }
 315                 }
 316
 317                 [Test]
 318                 public void VerifySignatureSHA1Hash ()
 319                 {
 320                         RSAPKCS1SignatureDeformatter fmt = GetDefaultDeformatter ("SHA1");
 321                         // good SHA1
 322                         byte[] data = new byte [20];
 323                         HashAlgorithm hash = SHA1.Create ();
 324                         hash.ComputeHash (data);
 325
 326                         byte[] shaSignature = { 0x7C, 0xA0, 0x13, 0xFB, 0xCB, 0x4D, 0x08, 0x02, 0x3C, 0x6B, 0x88, 0xA6, 0x25, 0x43, 0x17, 0x51, 0xA6, 0xA8, 0x8F, 0x5B, 0xAE, 0xC3, 0x57, 0x75, 0x2A, 0x8B, 0xD8, 0xBA, 0xCF, 0x9B, 0xBB, 0x5A, 0xD5, 0xB0, 0x11, 0xF2, 0xA9, 0xCC, 0xB5, 0x22, 0x59, 0xEE, 0x85, 0x49, 0x11, 0xB6, 0x9C, 0x50, 0x61, 0x4A, 0xEC, 0xA3, 0x50, 0x96, 0xE3, 0x2F, 0x1A, 0x6D, 0x9B, 0x6B, 0x6E, 0xC4, 0x50, 0x50, 0x84, 0x29, 0x92, 0x93, 0xE0, 0x0F, 0xCB, 0xBB, 0x61, 0x5D, 0x36, 0x51, 0x1A, 0xBB, 0x73, 0x75, 0x83, 0xEF, 0xDB, 0x4B, 0x2A, 0x38, 0x2C, 0x37, 0x0A, 0x1F, 0x84, 0xE0, 0x9B, 0x24, 0xDF, 0x69, 0x0E, 0x5C, 0xD9, 0xAF, 0x89, 0x72, 0x45, 0x30, 0xA1, 0xDB, 0xA8, 0x22, 0x40, 0x42, 0x07, 0xCC, 0x2A, 0x0E, 0x90, 0x9A, 0x4D, 0xE5, 0x2B, 0x48, 0x86, 0x4D, 0x01, 0x25, 0x23, 0x95, 0xB5, 0xBD };
 327                         Assert ("VerifySignature(SHA1, sign)", fmt.VerifySignature (hash, shaSignature));
 328                         // bad signature
 329                         shaSignature [0] = (byte) ~shaSignature [0];
 330                         Assert ("VerifySignature(SHA1, badSign)", !fmt.VerifySignature (hash, shaSignature));
 331                 }
 332
 333                 [Test]
 334 // v.1.0        [ExpectedException (typeof (CryptographicUnexpectedOperationException))]
 335 // v.1.1        [ExpectedException (typeof (NullReferenceException))]
 336                 public void VerifySignatureSHA1HashBadSignatureLength ()
 337                 {
 338                         RSAPKCS1SignatureDeformatter fmt = GetDefaultDeformatter ("SHA1");
 339                         // wrong signature length
 340                         byte[] badSignature = new byte [shaSignature.Length-1];
 341                         HashAlgorithm hash = SHA1.Create ();
 342                         try {
 343                                 fmt.VerifySignature (hash, badSignature);
 344                                 Fail ("VerifySignatureSHA1HashBadSignatureLength - Expected CryptographicUnexpectedOperationException but none");
 345                         }
 346                         catch (CryptographicUnexpectedOperationException) {
 347                                 // this was expected
 348                         }
 349                         catch (NullReferenceException) {
 350                                 // this wasn't expected - but that's the result from framework 1.1
 351                         }
 352                         catch (Exception e) {
 353                                 Fail ("VerifySignatureSHA1HashBadSignatureLength - Expected CryptographicUnexpectedOperationException but got: " + e.ToString ());
 354                         }
 355                 }
 356
 357                 [Test]
 358                 public void VerifySignatureMD5Hash ()
 359                 {
 360                         RSAPKCS1SignatureDeformatter fmt = GetDefaultDeformatter ("MD5");
 361                         // good MD5
 362                         byte[] data = new byte [20];
 363                         HashAlgorithm hash = MD5.Create ();
 364                         hash.ComputeHash (data);
 365                         byte[] signature = { 0x0F, 0xD6, 0x16, 0x2C, 0x31, 0xD6, 0xD7, 0xA0, 0xE8, 0xA0, 0x89, 0x53, 0x7B, 0x36, 0x8F, 0x25, 0xA5, 0xF6, 0x4A, 0x0B, 0xD3, 0xB9, 0x9B, 0xC4, 0xAE, 0xDC, 0xD4, 0x58, 0x5C, 0xD9, 0x58, 0x61, 0xE3, 0x66, 0x89, 0xB1, 0x1E, 0x33, 0x88, 0xDF, 0x58, 0xC4, 0x2E, 0xAE, 0xE7, 0x7B, 0x96, 0x61, 0x77, 0x91, 0xBD, 0xBD, 0x99, 0x9E, 0x1C, 0x3E, 0x0A, 0x5C, 0x15, 0x69, 0x00, 0xFA, 0xEE, 0xD7, 0xDC, 0xD2, 0x62, 0xA3, 0x31, 0x6A, 0x33, 0x75, 0xC8, 0x8E, 0x47, 0x5C, 0x1E, 0xD8, 0x91, 0x36, 0x65, 0xF3, 0x67, 0x63, 0xFC, 0x2B, 0x37, 0x7D, 0xE6, 0x2C, 0x2C, 0x09, 0x45, 0xE1, 0x8D, 0x8C, 0x8F, 0xFC, 0x6A, 0x4A, 0xD1, 0x4D, 0x06, 0xF3, 0x79, 0x9F, 0xDB, 0x0F, 0x4B, 0xD1, 0x94, 0x6F, 0xC7, 0xE7, 0x4E, 0x06, 0xDA, 0xDB, 0x2A, 0x51, 0x62, 0xCA, 0x1A, 0x31, 0x51, 0x2B, 0x83, 0xDD };
 366                         Assert ("VerifySignature(MD5, sign)", fmt.VerifySignature (hash, signature));
 367                 }
 368
 369                 [Test]
 370 // v.1.0        [ExpectedException (typeof (CryptographicUnexpectedOperationException))]
 371 // v.1.1        [ExpectedException (typeof (NullReferenceException))]
 372                 public void VerifyBadSignatureMD5Hash ()
 373                 {
 374                         RSAPKCS1SignatureDeformatter fmt = GetDefaultDeformatter ("MD5");
 375                         // bad signature
 376                         byte[] badSignature = new Byte [md5Signature.Length];
 377                         Array.Copy (md5Signature, 0, badSignature, 0, badSignature.Length);
 378                         badSignature[0] = (byte) ~md5Signature [0];
 379                         HashAlgorithm hash = MD5.Create ();
 380                         try {
 381                                 fmt.VerifySignature (hash, md5Signature);
 382                                 Fail ("VerifyBadSignatureMD5Hash - Expected CryptographicUnexpectedOperationException but none");
 383                         }
 384                         catch (CryptographicUnexpectedOperationException) {
 385                                 // this was expected
 386                         }
 387                         catch (NullReferenceException) {
 388                                 // this wasn't expected - but that's the result from framework 1.1
 389                         }
 390                         catch (Exception e) {
 391                                 Fail ("VerifyBadSignatureMD5Hash - Expected CryptographicUnexpectedOperationException but got: " + e.ToString ());
 392                         }
 393                 }
 394
 395                 [Test]
 396 // v.1.0        [ExpectedException (typeof (CryptographicUnexpectedOperationException))]
 397 // v.1.1        [ExpectedException (typeof (NullReferenceException))]
 398                 public void VerifySignatureMD5HashBadSignatureLength ()
 399                 {
 400                         RSAPKCS1SignatureDeformatter fmt = GetDefaultDeformatter ("MD5");
 401                         // wrong signature length
 402                         byte[] badSignature = new byte [md5Signature.Length-1];
 403                         HashAlgorithm hash = MD5.Create ();
 404                         try {
 405                                 fmt.VerifySignature (hash, md5Signature);
 406                                 Fail ("VerifySignatureMD5HashBadSignatureLength - Expected CryptographicUnexpectedOperationException but none");
 407                         }
 408                         catch (CryptographicUnexpectedOperationException) {
 409                                 // this was expected
 410                         }
 411                         catch (NullReferenceException) {
 412                                 // this wasn't expected - but that's the result from framework 1.1
 413                         }
 414                         catch (Exception e) {
 415                                 Fail ("VerifySignatureMD5HashBadSignatureLength - Expected CryptographicUnexpectedOperationException but got: " + e.ToString ());
 416                         }
 417                 }
 418
 419                 [Test]
 420                 public void VerifySignatureWithoutCallingSetHashAlgorithm ()
 421                 {
 422                         string text = "text to sign";
 423                         RSA rsa = RSA.Create ();
 424                         RSAPKCS1SignatureFormatter fmt = new RSAPKCS1SignatureFormatter (rsa);
 425                         SHA1 hash = SHA1.Create ();
 426                         hash.ComputeHash (Encoding.UTF8.GetBytes (text));
 427                         byte[] signature = fmt.CreateSignature (hash);
 428
 429                         RSAPKCS1SignatureDeformatter def = new RSAPKCS1SignatureDeformatter (rsa);
 430                         Assert ("Signature Ok", def.VerifySignature (hash, signature));
 431                 }
 432         }
 433 }