//
// 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 PSO2SERVER.Crypto
{
#if !INSIDE_CORLIB
    public
#endif
        abstract class Rc4 : SymmetricAlgorithm
    {
        private static readonly KeySizes[] SLegalBlockSizes =
        {
            new KeySizes(64, 64, 0)
        };

        private static readonly KeySizes[] SLegalKeySizes =
        {
            new KeySizes(40, 2048, 8)
        };

        protected Rc4()
        {
            KeySizeValue = 128;
            BlockSizeValue = 64;
            FeedbackSizeValue = BlockSizeValue;
            LegalBlockSizesValue = SLegalBlockSizes;
            LegalKeySizesValue = SLegalKeySizes;
        }

        // required for compatibility with .NET 2.0
        public override byte[] IV
        {
            get { return new byte[0]; }
            set
            {
                if (value == null) throw new ArgumentNullException("value");
            }
        }

        public new static Rc4 Create()
        {
#if FULL_AOT_RUNTIME
            return new ARC4Managed ();
#else
            return Create("RC4");
#endif
        }

        public new static Rc4 Create(string algName)
        {
            var o = CryptoConfig.CreateFromName(algName) ?? new Arc4Managed();
            // in case machine.config isn't configured to use 
            // any RC4 implementation
            return (Rc4) o;
        }
    }
}