init commit

output/Libraries/BouncyCastle.Crypto/Org/BouncyCastle/Crypto/Tls/Ssl3Mac.cs

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+using Org.BouncyCastle.Crypto.Parameters;
+using Org.BouncyCastle.Utilities;
+
+namespace Org.BouncyCastle.Crypto.Tls;
+
+public class Ssl3Mac : IMac
+{
+	private const byte IPAD_BYTE = 54;
+
+	private const byte OPAD_BYTE = 92;
+
+	internal static readonly byte[] IPAD = GenPad(54, 48);
+
+	internal static readonly byte[] OPAD = GenPad(92, 48);
+
+	private readonly IDigest digest;
+
+	private readonly int padLength;
+
+	private byte[] secret;
+
+	public virtual string AlgorithmName => digest.AlgorithmName + "/SSL3MAC";
+
+	public Ssl3Mac(IDigest digest)
+	{
+		this.digest = digest;
+		if (digest.GetDigestSize() == 20)
+		{
+			padLength = 40;
+		}
+		else
+		{
+			padLength = 48;
+		}
+	}
+
+	public virtual void Init(ICipherParameters parameters)
+	{
+		secret = Arrays.Clone(((KeyParameter)parameters).GetKey());
+		Reset();
+	}
+
+	public virtual int GetMacSize()
+	{
+		return digest.GetDigestSize();
+	}
+
+	public virtual void Update(byte input)
+	{
+		digest.Update(input);
+	}
+
+	public virtual void BlockUpdate(byte[] input, int inOff, int len)
+	{
+		digest.BlockUpdate(input, inOff, len);
+	}
+
+	public virtual int DoFinal(byte[] output, int outOff)
+	{
+		byte[] array = new byte[digest.GetDigestSize()];
+		digest.DoFinal(array, 0);
+		digest.BlockUpdate(secret, 0, secret.Length);
+		digest.BlockUpdate(OPAD, 0, padLength);
+		digest.BlockUpdate(array, 0, array.Length);
+		int result = digest.DoFinal(output, outOff);
+		Reset();
+		return result;
+	}
+
+	public virtual void Reset()
+	{
+		digest.Reset();
+		digest.BlockUpdate(secret, 0, secret.Length);
+		digest.BlockUpdate(IPAD, 0, padLength);
+	}
+
+	private static byte[] GenPad(byte b, int count)
+	{
+		byte[] array = new byte[count];
+		Arrays.Fill(array, b);
+		return array;
+	}
+}