mcs/class/System.Core/System.Security.Cryptography/AesManaged.cs

   1 //
   2 // System.Security.Cryptography.AesManaged.cs
   3 //
   4 // Authors:
   5 //      Mark Crichton (crichton@gimp.org)
   6 //      Andrew Birkett (andy@nobugs.org)
   7 //      Sebastien Pouliot (sebastien@xamarin.com)
   8 //      Kazuki Oikawa (kazuki@panicode.com)
   9 //
  10 // (C) 2002
  11 // Portions (C) 2002, 2003 Motus Technologies Inc. (http://www.motus.com)
  12 // Copyright (C) 2004-2005,2008 Novell, Inc (http://www.novell.com)
  13 // Copyright 2013 Xamarin Inc (http://www.xamarin.com)
  14 //
  15 // Permission is hereby granted, free of charge, to any person obtaining
  16 // a copy of this software and associated documentation files (the
  17 // "Software"), to deal in the Software without restriction, including
  18 // without limitation the rights to use, copy, modify, merge, publish,
  19 // distribute, sublicense, and/or sell copies of the Software, and to
  20 // permit persons to whom the Software is furnished to do so, subject to
  21 // the following conditions:
  22 //
  23 // The above copyright notice and this permission notice shall be
  24 // included in all copies or substantial portions of the Software.
  25 //
  26 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  27 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  28 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  29 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  30 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  31 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  32 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  33 //
  34
  35 using System.Security.Permissions;
  36
  37 using Mono.Security.Cryptography;
  38
  39 namespace System.Security.Cryptography {
  40
  41         // References:
  42         // a.   FIPS PUB 197: Advanced Encryption Standard
  43         //      http://csrc.nist.gov/publications/fips/fips197/fips-197.pdf
  44         // b.   Aes Specification
  45         //      http://csrc.nist.gov/CryptoToolkit/aes/Aes/Aes-ammended.pdf
  46
  47         [HostProtection (SecurityAction.LinkDemand, MayLeakOnAbort=true)]
  48         public sealed class AesManaged : Aes {
  49
  50                 public AesManaged ()
  51                 {
  52                 }
  53
  54                 public override void GenerateIV ()
  55                 {
  56                         IVValue = KeyBuilder.IV (BlockSizeValue >> 3);
  57                 }
  58
  59                 public override void GenerateKey ()
  60                 {
  61                         KeyValue = KeyBuilder.Key (KeySizeValue >> 3);
  62                 }
  63
  64                 public override ICryptoTransform CreateDecryptor (byte[] key, byte[] iv)
  65                 {
  66                         return new AesTransform (this, false, key, iv);
  67                 }
  68
  69                 public override ICryptoTransform CreateEncryptor (byte[] key, byte[] iv)
  70                 {
  71                         return new AesTransform (this, true, key, iv);
  72                 }
  73
  74                 // I suppose some attributes differs ?!? because this does not look required
  75
  76                 public override byte[] IV {
  77                         get { return base.IV; }
  78                         set { base.IV = value; }
  79                 }
  80
  81                 public override byte[] Key {
  82                         get { return base.Key; }
  83                         set { base.Key = value; }
  84                 }
  85
  86                 public override int KeySize {
  87                         get { return base.KeySize; }
  88                         set { base.KeySize = value; }
  89                 }
  90
  91                 public override int FeedbackSize {
  92                         get { return base.FeedbackSize; }
  93                         set { base.FeedbackSize = value; }
  94                 }
  95
  96                 public override CipherMode Mode {
  97                         get { return base.Mode; }
  98                         set {
  99                                 switch (value) {
 100                                 case CipherMode.CBC:
 101                                 case CipherMode.ECB:
 102                                         base.Mode = value;
 103                                         break;
 104                                 default:
 105                                         throw new CryptographicException ("CipherMode is not supported");
 106                                 }
 107                         }
 108                 }
 109
 110                 public override PaddingMode Padding {
 111                         get { return base.Padding; }
 112                         set { base.Padding = value; }
 113                 }
 114
 115                 public override ICryptoTransform CreateDecryptor ()
 116                 {
 117                         return CreateDecryptor (Key, IV);
 118                 }
 119
 120                 public override ICryptoTransform CreateEncryptor()
 121                 {
 122                         return CreateEncryptor (Key, IV);
 123                 }
 124
 125                 protected override void Dispose (bool disposing)
 126                 {
 127                         base.Dispose (disposing);
 128                 }
 129         }
 130 }