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//
// System.Security.Cryptography.AsymmetricAlgorithm Class implementation
//
// Authors:
// Thomas Neidhart (tome@sbox.tugraz.at)
// Sebastien Pouliot (sebastien@ximian.com)
//
// Portions (C) 2002, 2003 Motus Technologies Inc. (http://www.motus.com)
// Copyright (C) 2004-2005, 2008 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.
//
using System.Globalization;
using System.Runtime.InteropServices;
namespace System.Security.Cryptography {
#if NET_2_0
[ComVisible (true)]
#endif
public abstract class AsymmetricAlgorithm : IDisposable {
protected int KeySizeValue;
protected KeySizes[] LegalKeySizesValue;
protected AsymmetricAlgorithm ()
{
}
public abstract string KeyExchangeAlgorithm {
get;
}
public virtual int KeySize {
get { return this.KeySizeValue; }
set {
if (!KeySizes.IsLegalKeySize (this.LegalKeySizesValue, value))
throw new CryptographicException (Locale.GetText ("Key size not supported by algorithm."));
this.KeySizeValue = value;
}
}
public virtual KeySizes[] LegalKeySizes {
get { return this.LegalKeySizesValue; }
}
public abstract string SignatureAlgorithm {
get;
}
void IDisposable.Dispose ()
{
Dispose (true);
GC.SuppressFinalize (this); // Finalization is now unnecessary
}
public void Clear ()
{
Dispose (false);
}
protected abstract void Dispose (bool disposing);
public abstract void FromXmlString (string xmlString);
public abstract string ToXmlString (bool includePrivateParameters);
public static AsymmetricAlgorithm Create ()
{
return Create ("System.Security.Cryptography.AsymmetricAlgorithm");
}
public static AsymmetricAlgorithm Create (string algName)
{
return (AsymmetricAlgorithm) CryptoConfig.CreateFromName (algName);
}
// parsing helper shared between DSA and RSA
internal static byte [] GetNamedParam (string xml, string param)
{
string start_element = "<" + param + ">";
int start = xml.IndexOf (start_element);
if (start == -1)
return null;
string end_element = "</" + param + ">";
int end = xml.IndexOf (end_element);
if ((end == -1) || (end <= start))
return null;
start += start_element.Length;
string base64 = xml.Substring (start, end - start);
return Convert.FromBase64String (base64);
}
}
}
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