77 lines
1.6 KiB
C#
77 lines
1.6 KiB
C#
using System;
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using Org.BouncyCastle.Crypto.Digests;
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using Org.BouncyCastle.Crypto.Parameters;
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using Org.BouncyCastle.Utilities;
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namespace Org.BouncyCastle.Crypto.Macs;
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public class SkeinMac : IMac
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{
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public const int SKEIN_256 = 256;
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public const int SKEIN_512 = 512;
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public const int SKEIN_1024 = 1024;
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private readonly SkeinEngine engine;
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public string AlgorithmName => "Skein-MAC-" + engine.BlockSize * 8 + "-" + engine.OutputSize * 8;
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public SkeinMac(int stateSizeBits, int digestSizeBits)
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{
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engine = new SkeinEngine(stateSizeBits, digestSizeBits);
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}
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public SkeinMac(SkeinMac mac)
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{
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engine = new SkeinEngine(mac.engine);
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}
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public void Init(ICipherParameters parameters)
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{
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SkeinParameters skeinParameters;
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if (parameters is SkeinParameters)
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{
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skeinParameters = (SkeinParameters)parameters;
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}
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else
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{
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if (!(parameters is KeyParameter))
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{
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throw new ArgumentException("Invalid parameter passed to Skein MAC init - " + Platform.GetTypeName(parameters));
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}
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skeinParameters = new SkeinParameters.Builder().SetKey(((KeyParameter)parameters).GetKey()).Build();
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}
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if (skeinParameters.GetKey() == null)
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{
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throw new ArgumentException("Skein MAC requires a key parameter.");
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}
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engine.Init(skeinParameters);
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}
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public int GetMacSize()
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{
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return engine.OutputSize;
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}
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public void Reset()
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{
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engine.Reset();
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}
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public void Update(byte inByte)
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{
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engine.Update(inByte);
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}
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public void BlockUpdate(byte[] input, int inOff, int len)
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{
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engine.Update(input, inOff, len);
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}
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public int DoFinal(byte[] output, int outOff)
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{
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return engine.DoFinal(output, outOff);
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}
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}
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