2 // System.Security.Cryptography.AsymmetricAlgorithm Class implementation
5 // Thomas Neidhart (tome@sbox.tugraz.at)
6 // Sebastien Pouliot (sebastien@ximian.com)
8 // Portions (C) 2002, 2003 Motus Technologies Inc. (http://www.motus.com)
9 // Copyright (C) 2004-2005, 2008 Novell, Inc (http://www.novell.com)
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:
19 // The above copyright notice and this permission notice shall be
20 // included in all copies or substantial portions of the Software.
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.
31 using System.Globalization;
32 using System.Runtime.InteropServices;
34 namespace System.Security.Cryptography {
37 public abstract class AsymmetricAlgorithm : IDisposable {
39 protected int KeySizeValue;
40 protected KeySizes[] LegalKeySizesValue;
42 protected AsymmetricAlgorithm ()
46 public abstract string KeyExchangeAlgorithm {
50 public virtual int KeySize {
51 get { return this.KeySizeValue; }
53 if (!KeySizes.IsLegalKeySize (this.LegalKeySizesValue, value))
54 throw new CryptographicException (Locale.GetText ("Key size not supported by algorithm."));
56 this.KeySizeValue = value;
60 public virtual KeySizes[] LegalKeySizes {
61 get { return this.LegalKeySizesValue; }
64 public abstract string SignatureAlgorithm {
69 public void Dispose ()
71 void IDisposable.Dispose ()
75 GC.SuppressFinalize (this); // Finalization is now unnecessary
84 protected virtual void Dispose (bool disposing)
88 protected abstract void Dispose (bool disposing);
90 public abstract void FromXmlString (string xmlString);
92 public abstract string ToXmlString (bool includePrivateParameters);
94 public static AsymmetricAlgorithm Create ()
97 return new RSACryptoServiceProvider ();
99 return Create ("System.Security.Cryptography.AsymmetricAlgorithm");
103 public static AsymmetricAlgorithm Create (string algName)
105 return (AsymmetricAlgorithm) CryptoConfig.CreateFromName (algName);
108 // parsing helper shared between DSA and RSA
109 internal static byte [] GetNamedParam (string xml, string param)
111 string start_element = "<" + param + ">";
112 int start = xml.IndexOf (start_element);
116 string end_element = "</" + param + ">";
117 int end = xml.IndexOf (end_element);
118 if ((end == -1) || (end <= start))
121 start += start_element.Length;
123 string base64 = xml.Substring (start, end - start);
124 return Convert.FromBase64String (base64);