init commit

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

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+using System;
+using System.IO;
+using Org.BouncyCastle.Utilities;
+
+namespace Org.BouncyCastle.Crypto.Tls;
+
+public class UrlAndHash
+{
+	protected readonly string mUrl;
+
+	protected readonly byte[] mSha1Hash;
+
+	public virtual string Url => mUrl;
+
+	public virtual byte[] Sha1Hash => mSha1Hash;
+
+	public UrlAndHash(string url, byte[] sha1Hash)
+	{
+		if (url == null || url.Length < 1 || url.Length >= 65536)
+		{
+			throw new ArgumentException("must have length from 1 to (2^16 - 1)", "url");
+		}
+		if (sha1Hash != null && sha1Hash.Length != 20)
+		{
+			throw new ArgumentException("must have length == 20, if present", "sha1Hash");
+		}
+		mUrl = url;
+		mSha1Hash = sha1Hash;
+	}
+
+	public virtual void Encode(Stream output)
+	{
+		byte[] buf = Strings.ToByteArray(mUrl);
+		TlsUtilities.WriteOpaque16(buf, output);
+		if (mSha1Hash == null)
+		{
+			TlsUtilities.WriteUint8(0, output);
+			return;
+		}
+		TlsUtilities.WriteUint8(1, output);
+		output.Write(mSha1Hash, 0, mSha1Hash.Length);
+	}
+
+	public static UrlAndHash Parse(TlsContext context, Stream input)
+	{
+		byte[] array = TlsUtilities.ReadOpaque16(input);
+		if (array.Length < 1)
+		{
+			throw new TlsFatalAlert(47);
+		}
+		string url = Strings.FromByteArray(array);
+		byte[] sha1Hash = null;
+		switch (TlsUtilities.ReadUint8(input))
+		{
+		case 0:
+			if (TlsUtilities.IsTlsV12(context))
+			{
+				throw new TlsFatalAlert(47);
+			}
+			break;
+		case 1:
+			sha1Hash = TlsUtilities.ReadFully(20, input);
+			break;
+		default:
+			throw new TlsFatalAlert(47);
+		}
+		return new UrlAndHash(url, sha1Hash);
+	}
+}