128 lines
3.5 KiB
C#
128 lines
3.5 KiB
C#
//
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// System.Security.Cryptography.AsymmetricAlgorithm Class implementation
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//
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// Authors:
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// Thomas Neidhart (tome@sbox.tugraz.at)
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// Sebastien Pouliot (sebastien@ximian.com)
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//
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// Portions (C) 2002, 2003 Motus Technologies Inc. (http://www.motus.com)
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// Copyright (C) 2004-2005, 2008 Novell, Inc (http://www.novell.com)
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//
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// Permission is hereby granted, free of charge, to any person obtaining
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// a copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to
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// permit persons to whom the Software is furnished to do so, subject to
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// the following conditions:
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//
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// The above copyright notice and this permission notice shall be
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// included in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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//
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using System.Globalization;
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using System.Runtime.InteropServices;
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namespace System.Security.Cryptography {
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[ComVisible (true)]
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public abstract class AsymmetricAlgorithm : IDisposable {
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protected int KeySizeValue;
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protected KeySizes[] LegalKeySizesValue;
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protected AsymmetricAlgorithm ()
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{
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}
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public abstract string KeyExchangeAlgorithm {
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get;
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}
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public virtual int KeySize {
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get { return this.KeySizeValue; }
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set {
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if (!KeySizes.IsLegalKeySize (this.LegalKeySizesValue, value))
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throw new CryptographicException (Locale.GetText ("Key size not supported by algorithm."));
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this.KeySizeValue = value;
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}
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}
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public virtual KeySizes[] LegalKeySizes {
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get { return this.LegalKeySizesValue; }
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}
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public abstract string SignatureAlgorithm {
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get;
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}
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#if NET_4_0
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public void Dispose ()
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#else
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void IDisposable.Dispose ()
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#endif
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{
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Dispose (true);
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GC.SuppressFinalize (this); // Finalization is now unnecessary
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}
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public void Clear ()
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{
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Dispose (false);
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}
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#if NET_4_0
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protected virtual void Dispose (bool disposing)
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{
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}
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#else
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protected abstract void Dispose (bool disposing);
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#endif
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public abstract void FromXmlString (string xmlString);
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public abstract string ToXmlString (bool includePrivateParameters);
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public static AsymmetricAlgorithm Create ()
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{
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#if FULL_AOT_RUNTIME
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return new RSACryptoServiceProvider ();
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#else
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return Create ("System.Security.Cryptography.AsymmetricAlgorithm");
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#endif
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}
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public static AsymmetricAlgorithm Create (string algName)
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{
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return (AsymmetricAlgorithm) CryptoConfig.CreateFromName (algName);
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}
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// parsing helper shared between DSA and RSA
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internal static byte [] GetNamedParam (string xml, string param)
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{
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string start_element = "<" + param + ">";
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int start = xml.IndexOf (start_element);
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if (start == -1)
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return null;
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string end_element = "</" + param + ">";
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int end = xml.IndexOf (end_element);
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if ((end == -1) || (end <= start))
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return null;
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start += start_element.Length;
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string base64 = xml.Substring (start, end - start);
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return Convert.FromBase64String (base64);
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}
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}
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}
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