mcs/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 (spouliot@motus.com)
   7 //
   8 // Portions (C) 2002 Motus Technologies Inc. (http://www.motus.com)
   9 //
  10
  11 // Notes:
  12 // There seems to be some (internal?) class inheriting from SignatureDescription
  13 // 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
  14 // Those 2 classes are returned by CryptoConfig.CreateFromName and used in XMLDSIG
  15
  16 using System;
  17 using System.Security;
  18
  19 namespace System.Security.Cryptography {
  20
  21 public class SignatureDescription {
  22         private string _DeformatterAlgorithm;
  23         private string _DigestAlgorithm;
  24         private string _FormatterAlgorithm;
  25         private string _KeyAlgorithm;
  26
  27         public SignatureDescription () {}
  28
  29         /// LAMESPEC: ArgumentNullException is thrown (not CryptographicException)
  30         [MonoTODO("Parse SecurityElement")]
  31         public SignatureDescription (SecurityElement el)
  32         {
  33                 if (el == null)
  34                         throw new ArgumentNullException ();
  35                 // TODO: Parse the SecurityElement
  36                 // Clearly it must contains Deformatter, Digest,
  37                 // Formatter and KeyAlgorithm...
  38                 // But what do the SecurityElement looks like ?
  39         }
  40
  41         // There are no validation of the property
  42         public string DeformatterAlgorithm {
  43                 get { return _DeformatterAlgorithm; }
  44                 set { _DeformatterAlgorithm = value; }
  45         }
  46
  47         // There are no validation of the property
  48         public string DigestAlgorithm {
  49                 get { return _DigestAlgorithm; }
  50                 set { _DigestAlgorithm = value; }
  51         }
  52
  53         // There are no validation of the property
  54         public string FormatterAlgorithm {
  55                 get { return _FormatterAlgorithm; }
  56                 set { _FormatterAlgorithm = value; }
  57         }
  58
  59         // There are no validation of the property
  60         public string KeyAlgorithm {
  61                 get { return _KeyAlgorithm; }
  62                 set { _KeyAlgorithm = value; }
  63         }
  64
  65         public virtual AsymmetricSignatureDeformatter CreateDeformatter (AsymmetricAlgorithm key)
  66         {
  67                 if (_DeformatterAlgorithm == null)
  68                         throw new ArgumentNullException ("DeformatterAlgorithm");
  69
  70                 // this should throw the InvalidCastException if we have an invalid class
  71                 // (but not if the class doesn't exist - as null is valid for AsymmetricSignatureDeformatter)
  72                 AsymmetricSignatureDeformatter def = (AsymmetricSignatureDeformatter) CryptoConfig.CreateFromName (_DeformatterAlgorithm);
  73
  74                 if (_KeyAlgorithm == null)
  75                         throw new NullReferenceException ("KeyAlgorithm");
  76
  77                 def.SetKey (key);
  78                 return def;
  79         }
  80
  81         /// <summary>
  82         /// Create the hash algorithm assigned with this object
  83         /// </summary>
  84         public virtual HashAlgorithm CreateDigest ()
  85         {
  86                 if (_DigestAlgorithm == null)
  87                         throw new ArgumentNullException ("DigestAlgorithm");
  88                 return (HashAlgorithm) CryptoConfig.CreateFromName (_DigestAlgorithm);
  89         }
  90
  91         public virtual AsymmetricSignatureFormatter CreateFormatter (AsymmetricAlgorithm key)
  92         {
  93                 if (_FormatterAlgorithm == null)
  94                         throw new ArgumentNullException ("FormatterAlgorithm");
  95
  96                 // this should throw the InvalidCastException if we have an invalid class
  97                 // (but not if the class doesn't exist - as null is valid for AsymmetricSignatureDeformatter)
  98                 AsymmetricSignatureFormatter fmt = (AsymmetricSignatureFormatter) CryptoConfig.CreateFromName (_FormatterAlgorithm);
  99
 100                 if (_KeyAlgorithm == null)
 101                         throw new NullReferenceException ("KeyAlgorithm");
 102
 103                 fmt.SetKey (key);
 104                 return fmt;
 105         }
 106
 107 } // SignatureDescription
 108
 109 internal class DSASignatureDescription : SignatureDescription {
 110         public DSASignatureDescription ()
 111         {
 112                 DeformatterAlgorithm = "System.Security.Cryptography.DSASignatureDeformatter";
 113                 DigestAlgorithm = "System.Security.Cryptography.SHA1CryptoServiceProvider";
 114                 FormatterAlgorithm = "System.Security.Cryptography.DSASignatureFormatter";
 115                 KeyAlgorithm = "System.Security.Cryptography.DSACryptoServiceProvider";
 116         }
 117 }
 118
 119 internal class RSAPKCS1SHA1SignatureDescription : SignatureDescription {
 120         public RSAPKCS1SHA1SignatureDescription ()
 121         {
 122                 DeformatterAlgorithm = "System.Security.Cryptography.RSAPKCS1SignatureDeformatter";
 123                 DigestAlgorithm = "System.Security.Cryptography.SHA1CryptoServiceProvider";
 124                 FormatterAlgorithm = "System.Security.Cryptography.RSAPKCS1SignatureFormatter";
 125                 KeyAlgorithm = "System.Security.Cryptography.RSACryptoServiceProvider";
 126         }
 127
 128         public override AsymmetricSignatureDeformatter CreateDeformatter (AsymmetricAlgorithm key)
 129         {
 130                 // just to please corcompare
 131                 return base.CreateDeformatter (key);
 132         }
 133 }
 134
 135 } // System.Security.Cryptography