class/corlib/System.Security.Cryptography/SignatureDescription.cs

   1 //
   2 // System.Security.Cryptography SignatureDescription Class implementation
   3 //
   4 // Authors:
   5 //      Thomas Neidhart (tome@sbox.tugraz.at)
   6 //      Sebastien Pouliot <sebastien@ximian.com>
   7 //
   8 // Portions (C) 2002 Motus Technologies Inc. (http://www.motus.com)
   9 // Copyright (C) 2004-2005 Novell, Inc (http://www.novell.com)
  10 //
  11 // Permission is hereby granted, free of charge, to any person obtaining
  12 // a copy of this software and associated documentation files (the
  13 // "Software"), to deal in the Software without restriction, including
  14 // without limitation the rights to use, copy, modify, merge, publish,
  15 // distribute, sublicense, and/or sell copies of the Software, and to
  16 // permit persons to whom the Software is furnished to do so, subject to
  17 // the following conditions:
  18 //
  19 // The above copyright notice and this permission notice shall be
  20 // included in all copies or substantial portions of the Software.
  21 //
  22 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  23 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  24 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  25 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  26 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  27 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  28 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  29 //
  30
  31 // Notes:
  32 // There seems to be some (internal?) class inheriting from SignatureDescription
  33 // http://www.csharpfriends.com/Members/Main/Classes/get_class.aspx?assembly=mscorlib,%20Version=1.0.3300.0,%20Culture=neutral,%20PublicKeyToken=b77a5c561934e089&namespace=System.Security.Cryptography&class=SignatureDescription
  34 // Those 2 classes are returned by CryptoConfig.CreateFromName and used in XMLDSIG
  35
  36 using System.Globalization;
  37 using System.Runtime.InteropServices;
  38 using System.Security;
  39
  40 namespace System.Security.Cryptography {
  41
  42 [ComVisible (true)]
  43 public class SignatureDescription {
  44
  45         private string _DeformatterAlgorithm;
  46         private string _DigestAlgorithm;
  47         private string _FormatterAlgorithm;
  48         private string _KeyAlgorithm;
  49
  50         public SignatureDescription ()
  51         {
  52         }
  53
  54         /// LAMESPEC: ArgumentNullException is thrown (not CryptographicException)
  55         public SignatureDescription (SecurityElement el)
  56         {
  57                 if (el == null)
  58                         throw new ArgumentNullException ("el");
  59
  60                 // thanksfully documented in VS.NET 2005
  61                 SecurityElement child = el.SearchForChildByTag ("Deformatter");
  62                 _DeformatterAlgorithm = ((child == null) ? null : child.Text);
  63
  64                 child = el.SearchForChildByTag ("Digest");
  65                 _DigestAlgorithm = ((child == null) ? null : child.Text);
  66
  67                 child = el.SearchForChildByTag ("Formatter");
  68                 _FormatterAlgorithm = ((child == null) ? null : child.Text);
  69
  70                 child = el.SearchForChildByTag ("Key");
  71                 _KeyAlgorithm = ((child == null) ? null : child.Text);
  72         }
  73
  74         // There are no validation of the property
  75         public string DeformatterAlgorithm {
  76                 get { return _DeformatterAlgorithm; }
  77                 set { _DeformatterAlgorithm = value; }
  78         }
  79
  80         // There are no validation of the property
  81         public string DigestAlgorithm {
  82                 get { return _DigestAlgorithm; }
  83                 set { _DigestAlgorithm = value; }
  84         }
  85
  86         // There are no validation of the property
  87         public string FormatterAlgorithm {
  88                 get { return _FormatterAlgorithm; }
  89                 set { _FormatterAlgorithm = value; }
  90         }
  91
  92         // There are no validation of the property
  93         public string KeyAlgorithm {
  94                 get { return _KeyAlgorithm; }
  95                 set { _KeyAlgorithm = value; }
  96         }
  97
  98         public virtual AsymmetricSignatureDeformatter CreateDeformatter (AsymmetricAlgorithm key)
  99         {
 100                 if (_DeformatterAlgorithm == null)
 101                         throw new ArgumentNullException ("DeformatterAlgorithm");
 102
 103                 // this should throw the InvalidCastException if we have an invalid class
 104                 // (but not if the class doesn't exist - as null is valid for AsymmetricSignatureDeformatter)
 105                 AsymmetricSignatureDeformatter def = (AsymmetricSignatureDeformatter) CryptoConfig.CreateFromName (_DeformatterAlgorithm);
 106
 107                 if (_KeyAlgorithm == null)
 108                         throw new NullReferenceException ("KeyAlgorithm");
 109
 110                 def.SetKey (key);
 111                 return def;
 112         }
 113
 114         public virtual HashAlgorithm CreateDigest ()
 115         {
 116                 if (_DigestAlgorithm == null)
 117                         throw new ArgumentNullException ("DigestAlgorithm");
 118
 119                 return (HashAlgorithm) CryptoConfig.CreateFromName (_DigestAlgorithm);
 120         }
 121
 122         public virtual AsymmetricSignatureFormatter CreateFormatter (AsymmetricAlgorithm key)
 123         {
 124                 if (_FormatterAlgorithm == null)
 125                         throw new ArgumentNullException ("FormatterAlgorithm");
 126
 127                 // this should throw the InvalidCastException if we have an invalid class
 128                 // (but not if the class doesn't exist - as null is valid for AsymmetricSignatureDeformatter)
 129                 AsymmetricSignatureFormatter fmt = (AsymmetricSignatureFormatter) CryptoConfig.CreateFromName (_FormatterAlgorithm);
 130
 131                 if (_KeyAlgorithm == null)
 132                         throw new NullReferenceException ("KeyAlgorithm");
 133
 134                 fmt.SetKey (key);
 135                 return fmt;
 136         }
 137 }
 138
 139 internal class DSASignatureDescription : SignatureDescription {
 140         public DSASignatureDescription ()
 141         {
 142                 DeformatterAlgorithm = "System.Security.Cryptography.DSASignatureDeformatter";
 143                 DigestAlgorithm = "System.Security.Cryptography.SHA1CryptoServiceProvider";
 144                 FormatterAlgorithm = "System.Security.Cryptography.DSASignatureFormatter";
 145                 KeyAlgorithm = "System.Security.Cryptography.DSACryptoServiceProvider";
 146         }
 147 }
 148
 149 internal class RSAPKCS1SHA1SignatureDescription : SignatureDescription {
 150         public RSAPKCS1SHA1SignatureDescription ()
 151         {
 152                 DeformatterAlgorithm = "System.Security.Cryptography.RSAPKCS1SignatureDeformatter";
 153                 DigestAlgorithm = "System.Security.Cryptography.SHA1CryptoServiceProvider";
 154                 FormatterAlgorithm = "System.Security.Cryptography.RSAPKCS1SignatureFormatter";
 155                 KeyAlgorithm = "System.Security.Cryptography.RSACryptoServiceProvider";
 156         }
 157
 158         public override AsymmetricSignatureDeformatter CreateDeformatter (AsymmetricAlgorithm key)
 159         {
 160                 // just to please corcompare
 161                 return base.CreateDeformatter (key);
 162         }
 163 }
 164
 165 }