SuperVPN/output/Libraries/BouncyCastle.Crypto/Org/BouncyCastle/Crypto/Tls/AbstractTlsClient.cs

using System.Collections;

namespace Org.BouncyCastle.Crypto.Tls;

public abstract class AbstractTlsClient : AbstractTlsPeer, TlsClient, TlsPeer
{
	protected TlsCipherFactory mCipherFactory;

	protected TlsClientContext mContext;

	protected IList mSupportedSignatureAlgorithms;

	protected int[] mNamedCurves;

	protected byte[] mClientECPointFormats;

	protected byte[] mServerECPointFormats;

	protected int mSelectedCipherSuite;

	protected short mSelectedCompressionMethod;

	public virtual ProtocolVersion ClientHelloRecordLayerVersion => ClientVersion;

	public virtual ProtocolVersion ClientVersion => ProtocolVersion.TLSv12;

	public virtual bool IsFallback => false;

	public virtual ProtocolVersion MinimumVersion => ProtocolVersion.TLSv10;

	public AbstractTlsClient()
		: this(new DefaultTlsCipherFactory())
	{
	}

	public AbstractTlsClient(TlsCipherFactory cipherFactory)
	{
		mCipherFactory = cipherFactory;
	}

	protected virtual bool AllowUnexpectedServerExtension(int extensionType, byte[] extensionData)
	{
		switch (extensionType)
		{
		case 10:
			TlsEccUtilities.ReadSupportedEllipticCurvesExtension(extensionData);
			return true;
		case 11:
			TlsEccUtilities.ReadSupportedPointFormatsExtension(extensionData);
			return true;
		default:
			return false;
		}
	}

	protected virtual void CheckForUnexpectedServerExtension(IDictionary serverExtensions, int extensionType)
	{
		byte[] extensionData = TlsUtilities.GetExtensionData(serverExtensions, extensionType);
		if (extensionData != null && !AllowUnexpectedServerExtension(extensionType, extensionData))
		{
			throw new TlsFatalAlert(47);
		}
	}

	public virtual void Init(TlsClientContext context)
	{
		mContext = context;
	}

	public virtual TlsSession GetSessionToResume()
	{
		return null;
	}

	public virtual IDictionary GetClientExtensions()
	{
		IDictionary dictionary = null;
		ProtocolVersion clientVersion = mContext.ClientVersion;
		if (TlsUtilities.IsSignatureAlgorithmsExtensionAllowed(clientVersion))
		{
			mSupportedSignatureAlgorithms = TlsUtilities.GetDefaultSupportedSignatureAlgorithms();
			dictionary = TlsExtensionsUtilities.EnsureExtensionsInitialised(dictionary);
			TlsUtilities.AddSignatureAlgorithmsExtension(dictionary, mSupportedSignatureAlgorithms);
		}
		if (TlsEccUtilities.ContainsEccCipherSuites(GetCipherSuites()))
		{
			mNamedCurves = new int[2] { 23, 24 };
			mClientECPointFormats = new byte[3] { 0, 1, 2 };
			dictionary = TlsExtensionsUtilities.EnsureExtensionsInitialised(dictionary);
			TlsEccUtilities.AddSupportedEllipticCurvesExtension(dictionary, mNamedCurves);
			TlsEccUtilities.AddSupportedPointFormatsExtension(dictionary, mClientECPointFormats);
		}
		return dictionary;
	}

	public virtual void NotifyServerVersion(ProtocolVersion serverVersion)
	{
		if (!MinimumVersion.IsEqualOrEarlierVersionOf(serverVersion))
		{
			throw new TlsFatalAlert(70);
		}
	}

	public abstract int[] GetCipherSuites();

	public virtual byte[] GetCompressionMethods()
	{
		return new byte[1];
	}

	public virtual void NotifySessionID(byte[] sessionID)
	{
	}

	public virtual void NotifySelectedCipherSuite(int selectedCipherSuite)
	{
		mSelectedCipherSuite = selectedCipherSuite;
	}

	public virtual void NotifySelectedCompressionMethod(byte selectedCompressionMethod)
	{
		mSelectedCompressionMethod = selectedCompressionMethod;
	}

	public virtual void ProcessServerExtensions(IDictionary serverExtensions)
	{
		if (serverExtensions != null)
		{
			CheckForUnexpectedServerExtension(serverExtensions, 13);
			CheckForUnexpectedServerExtension(serverExtensions, 10);
			if (TlsEccUtilities.IsEccCipherSuite(mSelectedCipherSuite))
			{
				mServerECPointFormats = TlsEccUtilities.GetSupportedPointFormatsExtension(serverExtensions);
			}
			else
			{
				CheckForUnexpectedServerExtension(serverExtensions, 11);
			}
			CheckForUnexpectedServerExtension(serverExtensions, 21);
		}
	}

	public virtual void ProcessServerSupplementalData(IList serverSupplementalData)
	{
		if (serverSupplementalData != null)
		{
			throw new TlsFatalAlert(10);
		}
	}

	public abstract TlsKeyExchange GetKeyExchange();

	public abstract TlsAuthentication GetAuthentication();

	public virtual IList GetClientSupplementalData()
	{
		return null;
	}

	public override TlsCompression GetCompression()
	{
		return mSelectedCompressionMethod switch
		{
			0 => new TlsNullCompression(), 
			1 => new TlsDeflateCompression(), 
			_ => throw new TlsFatalAlert(80), 
		};
	}

	public override TlsCipher GetCipher()
	{
		int encryptionAlgorithm = TlsUtilities.GetEncryptionAlgorithm(mSelectedCipherSuite);
		int macAlgorithm = TlsUtilities.GetMacAlgorithm(mSelectedCipherSuite);
		return mCipherFactory.CreateCipher(mContext, encryptionAlgorithm, macAlgorithm);
	}

	public virtual void NotifyNewSessionTicket(NewSessionTicket newSessionTicket)
	{
	}
}