init commit

output/Libraries/BouncyCastle.Crypto/Org/BouncyCastle/Crypto/Macs/SkeinMac.cs

@@ -0,0 +1,76 @@
+using System;
+using Org.BouncyCastle.Crypto.Digests;
+using Org.BouncyCastle.Crypto.Parameters;
+using Org.BouncyCastle.Utilities;
+
+namespace Org.BouncyCastle.Crypto.Macs;
+
+public class SkeinMac : IMac
+{
+	public const int SKEIN_256 = 256;
+
+	public const int SKEIN_512 = 512;
+
+	public const int SKEIN_1024 = 1024;
+
+	private readonly SkeinEngine engine;
+
+	public string AlgorithmName => "Skein-MAC-" + engine.BlockSize * 8 + "-" + engine.OutputSize * 8;
+
+	public SkeinMac(int stateSizeBits, int digestSizeBits)
+	{
+		engine = new SkeinEngine(stateSizeBits, digestSizeBits);
+	}
+
+	public SkeinMac(SkeinMac mac)
+	{
+		engine = new SkeinEngine(mac.engine);
+	}
+
+	public void Init(ICipherParameters parameters)
+	{
+		SkeinParameters skeinParameters;
+		if (parameters is SkeinParameters)
+		{
+			skeinParameters = (SkeinParameters)parameters;
+		}
+		else
+		{
+			if (!(parameters is KeyParameter))
+			{
+				throw new ArgumentException("Invalid parameter passed to Skein MAC init - " + Platform.GetTypeName(parameters));
+			}
+			skeinParameters = new SkeinParameters.Builder().SetKey(((KeyParameter)parameters).GetKey()).Build();
+		}
+		if (skeinParameters.GetKey() == null)
+		{
+			throw new ArgumentException("Skein MAC requires a key parameter.");
+		}
+		engine.Init(skeinParameters);
+	}
+
+	public int GetMacSize()
+	{
+		return engine.OutputSize;
+	}
+
+	public void Reset()
+	{
+		engine.Reset();
+	}
+
+	public void Update(byte inByte)
+	{
+		engine.Update(inByte);
+	}
+
+	public void BlockUpdate(byte[] input, int inOff, int len)
+	{
+		engine.Update(input, inOff, len);
+	}
+
+	public int DoFinal(byte[] output, int outOff)
+	{
+		return engine.DoFinal(output, outOff);
+	}
+}