88 lines
2.3 KiB
C#
88 lines
2.3 KiB
C#
//
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// RC4.cs: RC4(tm) symmetric stream cipher
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// RC4 is a trademark of RSA Security
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//
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// Author:
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// Sebastien Pouliot (sebastien@xamarin.com)
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//
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// (C) 2003 Motus Technologies Inc. (http://www.motus.com)
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// Copyright 2013 Xamarin Inc. (http://www.xamarin.com)
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//
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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;
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using System.Security.Cryptography;
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namespace Mono.Security.Cryptography {
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#if !INSIDE_CORLIB
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public
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#endif
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abstract class RC4 : SymmetricAlgorithm {
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private static KeySizes[] s_legalBlockSizes = {
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new KeySizes (64, 64, 0)
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};
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private static KeySizes[] s_legalKeySizes = {
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new KeySizes (40, 2048, 8)
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};
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public RC4()
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{
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KeySizeValue = 128;
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BlockSizeValue = 64;
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FeedbackSizeValue = BlockSizeValue;
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LegalBlockSizesValue = s_legalBlockSizes;
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LegalKeySizesValue = s_legalKeySizes;
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}
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// required for compatibility with .NET 2.0
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public override byte[] IV {
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get { return new byte [0]; }
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set { ; }
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}
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new static public RC4 Create()
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{
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#if FULL_AOT_RUNTIME
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return new ARC4Managed ();
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#else
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return Create ("RC4");
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#endif
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}
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new static public RC4 Create (string algName)
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{
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object o = CryptoConfig.CreateFromName (algName);
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// in case machine.config isn't configured to use
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// any RC4 implementation
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if (o == null) {
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o = new ARC4Managed ();
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}
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return (RC4) o;
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}
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}
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}
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