mcs/class/corlib/CommonCrypto/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)
  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                 public override void GenerateIV ()
  43                 {
  44                         IVValue = KeyBuilder.IV (BlockSizeValue >> 3);
  45                 }
  46
  47                 public override void GenerateKey ()
  48                 {
  49                         KeyValue = KeyBuilder.Key (KeySizeValue >> 3);
  50                 }
  51
  52                 public override ICryptoTransform CreateDecryptor (byte[] rgbKey, byte[] rgbIV)
  53                 {
  54                         IntPtr decryptor = IntPtr.Zero;
  55                         switch (Mode) {
  56                         case CipherMode.CBC:
  57                                 decryptor = Cryptor.Create (CCOperation.Decrypt, CCAlgorithm.%CCALGORITHM%, CCOptions.None, rgbKey, rgbIV);
  58                                 return new FastCryptorTransform (decryptor, this, false, rgbIV);
  59                         case CipherMode.ECB:
  60                                 decryptor = Cryptor.Create (CCOperation.Decrypt, CCAlgorithm.%CCALGORITHM%, CCOptions.ECBMode, rgbKey, rgbIV);
  61                                 return new FastCryptorTransform (decryptor, this, false, rgbIV);
  62                         case CipherMode.CFB:
  63 #if MONOTOUCH || XAMMAC
  64                                 IntPtr encryptor = Cryptor.Create (CCOperation.Encrypt, CCAlgorithm.%CCALGORITHM%, CCOptions.ECBMode, rgbKey, rgbIV);
  65                                 decryptor = Cryptor.Create (CCOperation.Decrypt, CCAlgorithm.%CCALGORITHM%, CCOptions.ECBMode, rgbKey, rgbIV);
  66                                 return new CryptorTransform (decryptor, encryptor, this, false, rgbIV);
  67 #else
  68                                 throw new CryptographicException (""CFB is not supported by Crimson.CommonCrypto"");
  69 #endif
  70                         default:
  71                                 throw new CryptographicException (String.Format (""{0} is not supported by the .NET framework"", Mode));
  72                         }
  73                 }
  74
  75                 public override ICryptoTransform CreateEncryptor (byte[] rgbKey, byte[] rgbIV)
  76                 {
  77                         IntPtr encryptor = IntPtr.Zero;
  78                         switch (Mode) {
  79                         case CipherMode.CBC:
  80                                 encryptor = Cryptor.Create (CCOperation.Encrypt, CCAlgorithm.%CCALGORITHM%, CCOptions.None, rgbKey, rgbIV);
  81                                 return new FastCryptorTransform (encryptor, this, true, rgbIV);
  82                         case CipherMode.ECB:
  83                                 encryptor = Cryptor.Create (CCOperation.Encrypt, CCAlgorithm.%CCALGORITHM%, CCOptions.ECBMode, rgbKey, rgbIV);
  84                                 return new FastCryptorTransform (encryptor, this, true, rgbIV);
  85                         case CipherMode.CFB:
  86 #if MONOTOUCH || XAMMAC
  87                                 encryptor = Cryptor.Create (CCOperation.Encrypt, CCAlgorithm.%CCALGORITHM%, CCOptions.ECBMode, rgbKey, rgbIV);
  88                                 return new CryptorTransform (encryptor, IntPtr.Zero, this, true, rgbIV);
  89 #else
  90                                 throw new CryptographicException (""CFB is not supported by Crimson.CommonCrypto"");
  91 #endif
  92                         default:
  93                                 throw new CryptographicException (String.Format (""{0} is not supported by the .NET framework"", Mode));
  94                         }
  95                 }
  96         }
  97 }";
  98
  99                         File.WriteAllText (typeName + ".g.cs", template.Replace ("%NAMESPACE%", namespaceName).
 100                                 Replace ("%TYPE%", typeName).Replace ("%BASE%", baseTypeName).Replace("%FEEDBACKSIZE%", feedbackSize).Replace ("%CTOR_INIT%", ctorInitializers).
 101                                 Replace ("%CCALGORITHM%", ccAlgorithmName.ToString ()));
 102                 }
 103         }
 104 }