1 files changed, 95 insertions, 0 deletions
diff --git a/crypto/src/x509/X509CertPairParser.cs b/crypto/src/x509/X509CertPairParser.cs
new file mode 100644
index 000000000..82612599b
--- /dev/null
+++ b/crypto/src/x509/X509CertPairParser.cs
@@ -0,0 +1,95 @@
+using System;
+using System.Collections;
+using System.IO;
+
+using Org.BouncyCastle.Asn1;
+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 X509CertPairParser
+	{
+		private Stream currentStream;
+
+		private X509CertificatePair ReadDerCrossCertificatePair(
+			Stream inStream)
+		{
+			Asn1InputStream dIn = new Asn1InputStream(inStream);//, ProviderUtil.getReadLimit(in));
+			Asn1Sequence seq = (Asn1Sequence)dIn.ReadObject();
+			CertificatePair pair = CertificatePair.GetInstance(seq);
+			return new X509CertificatePair(pair);
+		}
+
+		/// <summary>
+		/// Create loading data from byte array.
+		/// </summary>
+		/// <param name="input"></param>
+		public X509CertificatePair ReadCertPair(
+			byte[] input)
+		{
+			return ReadCertPair(new MemoryStream(input, false));
+		}
+
+		/// <summary>
+		/// Create loading data from byte array.
+		/// </summary>
+		/// <param name="input"></param>
+		public ICollection ReadCertPairs(
+			byte[] input)
+		{
+			return ReadCertPairs(new MemoryStream(input, false));
+		}
+
+		public X509CertificatePair ReadCertPair(
+			Stream inStream)
+		{
+			if (inStream == null)
+				throw new ArgumentNullException("inStream");
+			if (!inStream.CanRead)
+				throw new ArgumentException("inStream must be read-able", "inStream");
+
+			if (currentStream == null)
+			{
+				currentStream = inStream;
+			}
+			else if (currentStream != inStream) // reset if input stream has changed
+			{
+				currentStream = inStream;
+			}
+
+			try
+			{
+				PushbackStream pis = new PushbackStream(inStream);
+				int tag = pis.ReadByte();
+
+				if (tag < 0)
+					return null;
+
+				pis.Unread(tag);
+
+				return ReadDerCrossCertificatePair(pis);
+			}
+			catch (Exception e)
+			{
+				throw new CertificateException(e.ToString());
+			}
+		}
+
+		public ICollection ReadCertPairs(
+			Stream inStream)
+		{
+			X509CertificatePair certPair;
+			IList certPairs = Platform.CreateArrayList();
+
+			while ((certPair = ReadCertPair(inStream)) != null)
+			{
+				certPairs.Add(certPair);
+			}
+
+			return certPairs;
+		}
+	}
+}