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//
// System.Security.Cryptography SignatureDescription Class implementation
//
// Authors:
// Thomas Neidhart (tome@sbox.tugraz.at)
// Sebastien Pouliot <sebastien@ximian.com>
//
// Portions (C) 2002 Motus Technologies Inc. (http://www.motus.com)
// Copyright (C) 2004-2005 Novell, Inc (http://www.novell.com)
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
// Notes:
// There seems to be some (internal?) class inheriting from SignatureDescription
// 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
// Those 2 classes are returned by CryptoConfig.CreateFromName and used in XMLDSIG
using System.Globalization;
using System.Runtime.InteropServices;
using System.Security;
namespace System.Security.Cryptography {
#if NET_2_0
[ComVisible (true)]
#endif
public class SignatureDescription {
private string _DeformatterAlgorithm;
private string _DigestAlgorithm;
private string _FormatterAlgorithm;
private string _KeyAlgorithm;
public SignatureDescription ()
{
}
/// LAMESPEC: ArgumentNullException is thrown (not CryptographicException)
public SignatureDescription (SecurityElement el)
{
if (el == null)
throw new ArgumentNullException ("el");
// thanksfully documented in VS.NET 2005
SecurityElement child = el.SearchForChildByTag ("Deformatter");
_DeformatterAlgorithm = ((child == null) ? null : child.Text);
child = el.SearchForChildByTag ("Digest");
_DigestAlgorithm = ((child == null) ? null : child.Text);
child = el.SearchForChildByTag ("Formatter");
_FormatterAlgorithm = ((child == null) ? null : child.Text);
child = el.SearchForChildByTag ("Key");
_KeyAlgorithm = ((child == null) ? null : child.Text);
}
// There are no validation of the property
public string DeformatterAlgorithm {
get { return _DeformatterAlgorithm; }
set { _DeformatterAlgorithm = value; }
}
// There are no validation of the property
public string DigestAlgorithm {
get { return _DigestAlgorithm; }
set { _DigestAlgorithm = value; }
}
// There are no validation of the property
public string FormatterAlgorithm {
get { return _FormatterAlgorithm; }
set { _FormatterAlgorithm = value; }
}
// There are no validation of the property
public string KeyAlgorithm {
get { return _KeyAlgorithm; }
set { _KeyAlgorithm = value; }
}
public virtual AsymmetricSignatureDeformatter CreateDeformatter (AsymmetricAlgorithm key)
{
if (_DeformatterAlgorithm == null)
throw new ArgumentNullException ("DeformatterAlgorithm");
// this should throw the InvalidCastException if we have an invalid class
// (but not if the class doesn't exist - as null is valid for AsymmetricSignatureDeformatter)
AsymmetricSignatureDeformatter def = (AsymmetricSignatureDeformatter) CryptoConfig.CreateFromName (_DeformatterAlgorithm);
if (_KeyAlgorithm == null)
throw new NullReferenceException ("KeyAlgorithm");
def.SetKey (key);
return def;
}
public virtual HashAlgorithm CreateDigest ()
{
if (_DigestAlgorithm == null)
throw new ArgumentNullException ("DigestAlgorithm");
return (HashAlgorithm) CryptoConfig.CreateFromName (_DigestAlgorithm);
}
public virtual AsymmetricSignatureFormatter CreateFormatter (AsymmetricAlgorithm key)
{
if (_FormatterAlgorithm == null)
throw new ArgumentNullException ("FormatterAlgorithm");
// this should throw the InvalidCastException if we have an invalid class
// (but not if the class doesn't exist - as null is valid for AsymmetricSignatureDeformatter)
AsymmetricSignatureFormatter fmt = (AsymmetricSignatureFormatter) CryptoConfig.CreateFromName (_FormatterAlgorithm);
if (_KeyAlgorithm == null)
throw new NullReferenceException ("KeyAlgorithm");
fmt.SetKey (key);
return fmt;
}
}
internal class DSASignatureDescription : SignatureDescription {
public DSASignatureDescription ()
{
DeformatterAlgorithm = "System.Security.Cryptography.DSASignatureDeformatter";
DigestAlgorithm = "System.Security.Cryptography.SHA1CryptoServiceProvider";
FormatterAlgorithm = "System.Security.Cryptography.DSASignatureFormatter";
KeyAlgorithm = "System.Security.Cryptography.DSACryptoServiceProvider";
}
}
internal class RSAPKCS1SHA1SignatureDescription : SignatureDescription {
public RSAPKCS1SHA1SignatureDescription ()
{
DeformatterAlgorithm = "System.Security.Cryptography.RSAPKCS1SignatureDeformatter";
DigestAlgorithm = "System.Security.Cryptography.SHA1CryptoServiceProvider";
FormatterAlgorithm = "System.Security.Cryptography.RSAPKCS1SignatureFormatter";
KeyAlgorithm = "System.Security.Cryptography.RSACryptoServiceProvider";
}
public override AsymmetricSignatureDeformatter CreateDeformatter (AsymmetricAlgorithm key)
{
// just to please corcompare
return base.CreateDeformatter (key);
}
}
}
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