init commit

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

@@ -0,0 +1,78 @@
+using System.Collections;
+using Org.BouncyCastle.Utilities;
+
+namespace Org.BouncyCastle.Crypto.Tls;
+
+public class SrpTlsClient : AbstractTlsClient
+{
+	protected TlsSrpGroupVerifier mGroupVerifier;
+
+	protected byte[] mIdentity;
+
+	protected byte[] mPassword;
+
+	protected virtual bool RequireSrpServerExtension => false;
+
+	public SrpTlsClient(byte[] identity, byte[] password)
+		: this(new DefaultTlsCipherFactory(), new DefaultTlsSrpGroupVerifier(), identity, password)
+	{
+	}
+
+	public SrpTlsClient(TlsCipherFactory cipherFactory, byte[] identity, byte[] password)
+		: this(cipherFactory, new DefaultTlsSrpGroupVerifier(), identity, password)
+	{
+	}
+
+	public SrpTlsClient(TlsCipherFactory cipherFactory, TlsSrpGroupVerifier groupVerifier, byte[] identity, byte[] password)
+		: base(cipherFactory)
+	{
+		mGroupVerifier = groupVerifier;
+		mIdentity = Arrays.Clone(identity);
+		mPassword = Arrays.Clone(password);
+	}
+
+	public override int[] GetCipherSuites()
+	{
+		return new int[1] { 49182 };
+	}
+
+	public override IDictionary GetClientExtensions()
+	{
+		IDictionary dictionary = TlsExtensionsUtilities.EnsureExtensionsInitialised(base.GetClientExtensions());
+		TlsSrpUtilities.AddSrpExtension(dictionary, mIdentity);
+		return dictionary;
+	}
+
+	public override void ProcessServerExtensions(IDictionary serverExtensions)
+	{
+		if (!TlsUtilities.HasExpectedEmptyExtensionData(serverExtensions, 12, 47) && RequireSrpServerExtension)
+		{
+			throw new TlsFatalAlert(47);
+		}
+		base.ProcessServerExtensions(serverExtensions);
+	}
+
+	public override TlsKeyExchange GetKeyExchange()
+	{
+		int keyExchangeAlgorithm = TlsUtilities.GetKeyExchangeAlgorithm(mSelectedCipherSuite);
+		switch (keyExchangeAlgorithm)
+		{
+		case 21:
+		case 22:
+		case 23:
+			return CreateSrpKeyExchange(keyExchangeAlgorithm);
+		default:
+			throw new TlsFatalAlert(80);
+		}
+	}
+
+	public override TlsAuthentication GetAuthentication()
+	{
+		throw new TlsFatalAlert(80);
+	}
+
+	protected virtual TlsKeyExchange CreateSrpKeyExchange(int keyExchange)
+	{
+		return new TlsSrpKeyExchange(keyExchange, mSupportedSignatureAlgorithms, mGroupVerifier, mIdentity, mPassword);
+	}
+}