mcs/tools/commoncryptogenerator/CommonCryptorGenerator.cs

   1 //
   2 // CommonCrypto code generator for symmetric block cipher algorithms
   3 //
   4 // Authors:
   5 //      Sebastien Pouliot  <sebastien@xamarin.com>
   6 //
   7 // Copyright 2012 Xamarin Inc.
   8 //
   9
  10 using System;
  11 using System.IO;
  12
  13 namespace Xamarin {
  14
  15         public static class CommonCryptor {
  16
  17                 static public void Generate (string namespaceName, string typeName, string baseTypeName, string ccAlgorithmName, string feedbackSize = "8", string ctorInitializers = null, string decryptorInitializers = null, string encryptorInitializers = null, string properties = null)
  18                 {
  19                         string template = @"// Generated file to bind CommonCrypto cipher algorithms - DO NOT EDIT
  20 //
  21 // Authors:
  22 //      Sebastien Pouliot  <sebastien@xamarin.com>
  23 //
  24 // Copyright 2012-2014 Xamarin Inc.
  25
  26 using System;
  27 using System.Security.Cryptography;
  28
  29 using Mono.Security.Cryptography;
  30 using Crimson.CommonCrypto;
  31
  32 namespace %NAMESPACE% {
  33
  34         public sealed partial class %TYPE% : %BASE% {
  35
  36                 public %TYPE% ()
  37                 {
  38                         FeedbackSizeValue = %FEEDBACKSIZE%;
  39                         %CTOR_INIT%
  40                 }
  41
  42                 %PROPERTIES%
  43
  44                 public override void GenerateIV ()
  45                 {
  46                         IVValue = KeyBuilder.IV (BlockSizeValue >> 3);
  47                 }
  48
  49                 public override void GenerateKey ()
  50                 {
  51                         KeyValue = KeyBuilder.Key (KeySizeValue >> 3);
  52                 }
  53
  54                 public override ICryptoTransform CreateDecryptor (byte[] rgbKey, byte[] rgbIV)
  55                 {
  56                         %CREATEDECRYPTOR_INIT%
  57
  58                         IntPtr decryptor = IntPtr.Zero;
  59                         switch (Mode) {
  60                         case CipherMode.CBC:
  61                                 decryptor = Cryptor.Create (CCOperation.Decrypt, CCAlgorithm.%CCALGORITHM%, CCOptions.None, rgbKey, rgbIV);
  62                                 return new FastCryptorTransform (decryptor, this, false, rgbIV);
  63                         case CipherMode.ECB:
  64                                 decryptor = Cryptor.Create (CCOperation.Decrypt, CCAlgorithm.%CCALGORITHM%, CCOptions.ECBMode, rgbKey, rgbIV);
  65                                 return new FastCryptorTransform (decryptor, this, false, rgbIV);
  66                         case CipherMode.CFB:
  67 #if MONOTOUCH || XAMMAC
  68                                 IntPtr encryptor = Cryptor.Create (CCOperation.Encrypt, CCAlgorithm.%CCALGORITHM%, CCOptions.ECBMode, rgbKey, rgbIV);
  69                                 decryptor = Cryptor.Create (CCOperation.Decrypt, CCAlgorithm.%CCALGORITHM%, CCOptions.ECBMode, rgbKey, rgbIV);
  70                                 return new CryptorTransform (decryptor, encryptor, this, false, rgbIV);
  71 #else
  72                                 throw new CryptographicException (""CFB is not supported by Crimson.CommonCrypto"");
  73 #endif
  74                         default:
  75                                 throw new CryptographicException (String.Format (""{0} is not supported by the .NET framework"", Mode));
  76                         }
  77                 }
  78
  79                 public override ICryptoTransform CreateEncryptor (byte[] rgbKey, byte[] rgbIV)
  80                 {
  81                         %CREATEENCRYPTOR_INIT%
  82
  83                         IntPtr encryptor = IntPtr.Zero;
  84                         switch (Mode) {
  85                         case CipherMode.CBC:
  86                                 encryptor = Cryptor.Create (CCOperation.Encrypt, CCAlgorithm.%CCALGORITHM%, CCOptions.None, rgbKey, rgbIV);
  87                                 return new FastCryptorTransform (encryptor, this, true, rgbIV);
  88                         case CipherMode.ECB:
  89                                 encryptor = Cryptor.Create (CCOperation.Encrypt, CCAlgorithm.%CCALGORITHM%, CCOptions.ECBMode, rgbKey, rgbIV);
  90                                 return new FastCryptorTransform (encryptor, this, true, rgbIV);
  91                         case CipherMode.CFB:
  92 #if MONOTOUCH || XAMMAC
  93                                 encryptor = Cryptor.Create (CCOperation.Encrypt, CCAlgorithm.%CCALGORITHM%, CCOptions.ECBMode, rgbKey, rgbIV);
  94                                 return new CryptorTransform (encryptor, IntPtr.Zero, this, true, rgbIV);
  95 #else
  96                                 throw new CryptographicException (""CFB is not supported by Crimson.CommonCrypto"");
  97 #endif
  98                         default:
  99                                 throw new CryptographicException (String.Format (""{0} is not supported by the .NET framework"", Mode));
 100                         }
 101                 }
 102         }
 103 }";
 104
 105                         File.WriteAllText (typeName + ".g.cs", template.Replace ("%NAMESPACE%", namespaceName).
 106                                 Replace ("%TYPE%", typeName).Replace ("%BASE%", baseTypeName).Replace("%FEEDBACKSIZE%", feedbackSize).Replace ("%CTOR_INIT%", ctorInitializers).
 107                                 Replace ("%CREATEDECRYPTOR_INIT%", decryptorInitializers).
 108                                 Replace ("%CREATEENCRYPTOR_INIT%", encryptorInitializers).
 109                                 Replace ("%PROPERTIES%", properties).
 110                                 Replace ("%CCALGORITHM%", ccAlgorithmName.ToString ()));
 111                 }
 112         }
 113 }