2 // System.Security.Cryptography.RC2.cs
5 // Andrew Birkett (andy@nobugs.org)
6 // Sebastien Pouliot (sebastien@ximian.com)
8 // Copyright (C) 2004-2006 Novell, Inc (http://www.novell.com)
10 // Permission is hereby granted, free of charge, to any person obtaining
11 // a copy of this software and associated documentation files (the
12 // "Software"), to deal in the Software without restriction, including
13 // without limitation the rights to use, copy, modify, merge, publish,
14 // distribute, sublicense, and/or sell copies of the Software, and to
15 // permit persons to whom the Software is furnished to do so, subject to
16 // the following conditions:
18 // The above copyright notice and this permission notice shall be
19 // included in all copies or substantial portions of the Software.
21 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
22 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
23 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
24 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
25 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
26 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
27 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
30 using System.Runtime.InteropServices;
32 namespace System.Security.Cryptography {
35 // a. IETF RFC2286: A Description of the RC2(r) Encryption Algorithm
36 // http://www.ietf.org/rfc/rfc2268.txt
39 public abstract class RC2 : SymmetricAlgorithm {
41 public static new RC2 Create ()
44 return new System.Security.Cryptography.RC2CryptoServiceProvider ();
46 return Create ("System.Security.Cryptography.RC2");
50 public static new RC2 Create (string AlgName)
52 return (RC2) CryptoConfig.CreateFromName (AlgName);
55 protected int EffectiveKeySizeValue;
57 public virtual int EffectiveKeySize {
59 if (EffectiveKeySizeValue == 0)
62 return EffectiveKeySizeValue;
65 EffectiveKeySizeValue = value;
69 public override int KeySize {
70 get { return base.KeySize; }
73 EffectiveKeySizeValue = value;
81 FeedbackSizeValue = 8;
83 // The RFC allows keys of 1 to 128 bytes, but MS impl only supports
84 // 40 to 128 bits, sigh.
85 LegalKeySizesValue = new KeySizes [1];
86 LegalKeySizesValue [0] = new KeySizes (40, 128, 8);
88 LegalBlockSizesValue = new KeySizes [1];
89 LegalBlockSizesValue [0] = new KeySizes (64, 64, 0);