init commit

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

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+using System;
+using System.Collections;
+using System.IO;
+using Org.BouncyCastle.Asn1;
+using Org.BouncyCastle.Asn1.X509;
+using Org.BouncyCastle.Utilities;
+
+namespace Org.BouncyCastle.Crypto.Tls;
+
+public class Certificate
+{
+	public static readonly Certificate EmptyChain = new Certificate(new X509CertificateStructure[0]);
+
+	protected readonly X509CertificateStructure[] mCertificateList;
+
+	public virtual int Length => mCertificateList.Length;
+
+	public virtual bool IsEmpty => mCertificateList.Length == 0;
+
+	public Certificate(X509CertificateStructure[] certificateList)
+	{
+		if (certificateList == null)
+		{
+			throw new ArgumentNullException("certificateList");
+		}
+		mCertificateList = certificateList;
+	}
+
+	public virtual X509CertificateStructure[] GetCertificateList()
+	{
+		return CloneCertificateList();
+	}
+
+	public virtual X509CertificateStructure GetCertificateAt(int index)
+	{
+		return mCertificateList[index];
+	}
+
+	public virtual void Encode(Stream output)
+	{
+		IList list = Platform.CreateArrayList(mCertificateList.Length);
+		int num = 0;
+		X509CertificateStructure[] array = mCertificateList;
+		foreach (Asn1Encodable asn1Encodable in array)
+		{
+			byte[] encoded = asn1Encodable.GetEncoded("DER");
+			list.Add(encoded);
+			num += encoded.Length + 3;
+		}
+		TlsUtilities.CheckUint24(num);
+		TlsUtilities.WriteUint24(num, output);
+		foreach (byte[] item in list)
+		{
+			TlsUtilities.WriteOpaque24(item, output);
+		}
+	}
+
+	public static Certificate Parse(Stream input)
+	{
+		int num = TlsUtilities.ReadUint24(input);
+		if (num == 0)
+		{
+			return EmptyChain;
+		}
+		byte[] buffer = TlsUtilities.ReadFully(num, input);
+		MemoryStream memoryStream = new MemoryStream(buffer, writable: false);
+		IList list = Platform.CreateArrayList();
+		while (memoryStream.Position < memoryStream.Length)
+		{
+			byte[] encoding = TlsUtilities.ReadOpaque24(memoryStream);
+			Asn1Object obj = TlsUtilities.ReadAsn1Object(encoding);
+			list.Add(X509CertificateStructure.GetInstance(obj));
+		}
+		X509CertificateStructure[] array = new X509CertificateStructure[list.Count];
+		for (int i = 0; i < list.Count; i++)
+		{
+			array[i] = (X509CertificateStructure)list[i];
+		}
+		return new Certificate(array);
+	}
+
+	protected virtual X509CertificateStructure[] CloneCertificateList()
+	{
+		return (X509CertificateStructure[])mCertificateList.Clone();
+	}
+}