init commit

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

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+using System;
+using System.Collections;
+using System.IO;
+using Org.BouncyCastle.Math;
+using Org.BouncyCastle.Utilities;
+
+namespace Org.BouncyCastle.Crypto.Tls;
+
+public abstract class TlsSrpUtilities
+{
+	public static void AddSrpExtension(IDictionary extensions, byte[] identity)
+	{
+		extensions[12] = CreateSrpExtension(identity);
+	}
+
+	public static byte[] GetSrpExtension(IDictionary extensions)
+	{
+		byte[] extensionData = TlsUtilities.GetExtensionData(extensions, 12);
+		if (extensionData != null)
+		{
+			return ReadSrpExtension(extensionData);
+		}
+		return null;
+	}
+
+	public static byte[] CreateSrpExtension(byte[] identity)
+	{
+		if (identity == null)
+		{
+			throw new TlsFatalAlert(80);
+		}
+		return TlsUtilities.EncodeOpaque8(identity);
+	}
+
+	public static byte[] ReadSrpExtension(byte[] extensionData)
+	{
+		if (extensionData == null)
+		{
+			throw new ArgumentNullException("extensionData");
+		}
+		MemoryStream memoryStream = new MemoryStream(extensionData, writable: false);
+		byte[] result = TlsUtilities.ReadOpaque8(memoryStream);
+		TlsProtocol.AssertEmpty(memoryStream);
+		return result;
+	}
+
+	public static BigInteger ReadSrpParameter(Stream input)
+	{
+		return new BigInteger(1, TlsUtilities.ReadOpaque16(input));
+	}
+
+	public static void WriteSrpParameter(BigInteger x, Stream output)
+	{
+		TlsUtilities.WriteOpaque16(BigIntegers.AsUnsignedByteArray(x), output);
+	}
+
+	public static bool IsSrpCipherSuite(int cipherSuite)
+	{
+		switch (cipherSuite)
+		{
+		case 49178:
+		case 49179:
+		case 49180:
+		case 49181:
+		case 49182:
+		case 49183:
+		case 49184:
+		case 49185:
+		case 49186:
+			return true;
+		default:
+			return false;
+		}
+	}
+}