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