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Packages/com.tivadar.best.http/Runtime/3rdParty/BouncyCastle/x509/X509CertificateParser.cs

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+#if !BESTHTTP_DISABLE_ALTERNATE_SSL && (!UNITY_WEBGL || UNITY_EDITOR)
+#pragma warning disable
+using System;
+using System.Collections.Generic;
+using System.IO;
+
+using Best.HTTP.SecureProtocol.Org.BouncyCastle.Asn1;
+using Best.HTTP.SecureProtocol.Org.BouncyCastle.Asn1.Pkcs;
+using Best.HTTP.SecureProtocol.Org.BouncyCastle.Asn1.X509;
+using Best.HTTP.SecureProtocol.Org.BouncyCastle.Security.Certificates;
+using Best.HTTP.SecureProtocol.Org.BouncyCastle.Utilities.IO;
+
+namespace Best.HTTP.SecureProtocol.Org.BouncyCastle.X509
+{
+	/**
+	 * class for dealing with X509 certificates.
+	 * <p>
+	 * At the moment this will deal with "-----BEGIN CERTIFICATE-----" to "-----END CERTIFICATE-----"
+	 * base 64 encoded certs, as well as the BER binaries of certificates and some classes of PKCS#7
+	 * objects.</p>
+	 */
+	public class X509CertificateParser
+	{
+		private static readonly PemParser PemCertParser = new PemParser("CERTIFICATE");
+
+		private Asn1Set sData;
+		private int sDataObjectCount;
+		private Stream currentStream;
+
+		private X509Certificate ReadDerCertificate(Asn1InputStream dIn)
+		{
+			Asn1Sequence seq = (Asn1Sequence)dIn.ReadObject();
+
+			if (seq.Count > 1 && seq[0] is DerObjectIdentifier)
+			{
+				if (seq[0].Equals(PkcsObjectIdentifiers.SignedData))
+				{
+					sData = SignedData.GetInstance(
+						Asn1Sequence.GetInstance((Asn1TaggedObject) seq[1], true)).Certificates;
+
+					return GetCertificate();
+				}
+			}
+
+			return new X509Certificate(X509CertificateStructure.GetInstance(seq));
+		}
+
+		private X509Certificate ReadPemCertificate(Stream inStream)
+		{
+			Asn1Sequence seq = PemCertParser.ReadPemObject(inStream);
+
+			return seq == null ? null : new X509Certificate(X509CertificateStructure.GetInstance(seq));
+		}
+
+		private X509Certificate GetCertificate()
+		{
+			if (sData != null)
+			{
+				while (sDataObjectCount < sData.Count)
+				{
+					object obj = sData[sDataObjectCount++];
+
+					if (obj is Asn1Sequence)
+						return new X509Certificate(X509CertificateStructure.GetInstance(obj));
+				}
+			}
+
+			return null;
+		}
+
+		/// <summary>
+		/// Create loading data from byte array.
+		/// </summary>
+		/// <param name="input"></param>
+		public X509Certificate ReadCertificate(byte[] input)
+		{
+			return ReadCertificate(new MemoryStream(input, false));
+		}
+
+		/// <summary>
+		/// Create loading data from byte array.
+		/// </summary>
+		/// <param name="input"></param>
+		public IList<X509Certificate> ReadCertificates(byte[] input)
+		{
+			return ReadCertificates(new MemoryStream(input, false));
+		}
+
+		/**
+		 * Generates a certificate object and initializes it with the data
+		 * read from the input stream inStream.
+		 */
+		public X509Certificate ReadCertificate(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;
+				sData = null;
+				sDataObjectCount = 0;
+			}
+			else if (currentStream != inStream) // reset if input stream has changed
+			{
+				currentStream = inStream;
+				sData = null;
+				sDataObjectCount = 0;
+			}
+
+			try
+			{
+				if (sData != null)
+				{
+					if (sDataObjectCount != sData.Count)
+						return GetCertificate();
+
+					sData = null;
+					sDataObjectCount = 0;
+					return null;
+				}
+
+                int tag = inStream.ReadByte();
+                if (tag < 0)
+                    return null;
+
+                if (inStream.CanSeek)
+                {
+                    inStream.Seek(-1L, SeekOrigin.Current);
+                }
+                else
+                {
+                    PushbackStream pis = new PushbackStream(inStream);
+                    pis.Unread(tag);
+                    inStream = pis;
+                }
+
+                if (tag != 0x30)  // assume ascii PEM encoded.
+					return ReadPemCertificate(inStream);
+
+				return ReadDerCertificate(new Asn1InputStream(inStream));
+			}
+			catch (Exception e)
+			{
+				throw new CertificateException("Failed to read certificate", e);
+			}
+		}
+
+		/**
+		 * Returns a (possibly empty) collection view of the certificates
+		 * read from the given input stream inStream.
+		 */
+		public IList<X509Certificate> ReadCertificates(Stream inStream)
+		{
+			return new List<X509Certificate>(ParseCertificates(inStream));
+		}
+
+		public IEnumerable<X509Certificate> ParseCertificates(Stream inStream)
+		{
+			X509Certificate cert;
+			while ((cert = ReadCertificate(inStream)) != null)
+			{
+				yield return cert;
+			}
+		}
+	}
+}
+#pragma warning restore
+#endif