init commit

output/Libraries/BouncyCastle.Crypto/Org/BouncyCastle/X509/X509CrlParser.cs

@@ -0,0 +1,148 @@
+using System;
+using System.Collections;
+using System.IO;
+using Org.BouncyCastle.Asn1;
+using Org.BouncyCastle.Asn1.Pkcs;
+using Org.BouncyCastle.Asn1.X509;
+using Org.BouncyCastle.Security.Certificates;
+using Org.BouncyCastle.Utilities;
+using Org.BouncyCastle.Utilities.IO;
+
+namespace Org.BouncyCastle.X509;
+
+public class X509CrlParser
+{
+	private static readonly PemParser PemCrlParser = new PemParser("CRL");
+
+	private readonly bool lazyAsn1;
+
+	private Asn1Set sCrlData;
+
+	private int sCrlDataObjectCount;
+
+	private Stream currentCrlStream;
+
+	public X509CrlParser()
+		: this(lazyAsn1: false)
+	{
+	}
+
+	public X509CrlParser(bool lazyAsn1)
+	{
+		this.lazyAsn1 = lazyAsn1;
+	}
+
+	private X509Crl ReadPemCrl(Stream inStream)
+	{
+		Asn1Sequence asn1Sequence = PemCrlParser.ReadPemObject(inStream);
+		if (asn1Sequence != null)
+		{
+			return CreateX509Crl(CertificateList.GetInstance(asn1Sequence));
+		}
+		return null;
+	}
+
+	private X509Crl ReadDerCrl(Asn1InputStream dIn)
+	{
+		Asn1Sequence asn1Sequence = (Asn1Sequence)dIn.ReadObject();
+		if (asn1Sequence.Count > 1 && asn1Sequence[0] is DerObjectIdentifier && asn1Sequence[0].Equals(PkcsObjectIdentifiers.SignedData))
+		{
+			sCrlData = SignedData.GetInstance(Asn1Sequence.GetInstance((Asn1TaggedObject)asn1Sequence[1], explicitly: true)).Crls;
+			return GetCrl();
+		}
+		return CreateX509Crl(CertificateList.GetInstance(asn1Sequence));
+	}
+
+	private X509Crl GetCrl()
+	{
+		if (sCrlData == null || sCrlDataObjectCount >= sCrlData.Count)
+		{
+			return null;
+		}
+		return CreateX509Crl(CertificateList.GetInstance(sCrlData[sCrlDataObjectCount++]));
+	}
+
+	protected virtual X509Crl CreateX509Crl(CertificateList c)
+	{
+		return new X509Crl(c);
+	}
+
+	public X509Crl ReadCrl(byte[] input)
+	{
+		return ReadCrl(new MemoryStream(input, writable: false));
+	}
+
+	public ICollection ReadCrls(byte[] input)
+	{
+		return ReadCrls(new MemoryStream(input, writable: false));
+	}
+
+	public X509Crl ReadCrl(Stream inStream)
+	{
+		if (inStream == null)
+		{
+			throw new ArgumentNullException("inStream");
+		}
+		if (!inStream.CanRead)
+		{
+			throw new ArgumentException("inStream must be read-able", "inStream");
+		}
+		if (currentCrlStream == null)
+		{
+			currentCrlStream = inStream;
+			sCrlData = null;
+			sCrlDataObjectCount = 0;
+		}
+		else if (currentCrlStream != inStream)
+		{
+			currentCrlStream = inStream;
+			sCrlData = null;
+			sCrlDataObjectCount = 0;
+		}
+		try
+		{
+			if (sCrlData != null)
+			{
+				if (sCrlDataObjectCount != sCrlData.Count)
+				{
+					return GetCrl();
+				}
+				sCrlData = null;
+				sCrlDataObjectCount = 0;
+				return null;
+			}
+			PushbackStream pushbackStream = new PushbackStream(inStream);
+			int num = pushbackStream.ReadByte();
+			if (num < 0)
+			{
+				return null;
+			}
+			pushbackStream.Unread(num);
+			if (num != 48)
+			{
+				return ReadPemCrl(pushbackStream);
+			}
+			Asn1InputStream dIn = (lazyAsn1 ? new LazyAsn1InputStream(pushbackStream) : new Asn1InputStream(pushbackStream));
+			return ReadDerCrl(dIn);
+		}
+		catch (CrlException ex)
+		{
+			throw ex;
+		}
+		catch (Exception ex2)
+		{
+			throw new CrlException(ex2.ToString());
+		}
+	}
+
+	public ICollection ReadCrls(Stream inStream)
+	{
+		IList list = Platform.CreateArrayList();
+		X509Crl value;
+		while ((value = ReadCrl(inStream)) != null)
+		{
+			list.Add(value);
+		}
+		return list;
+	}
+}