Initial Commit

iTechSharp/srcbc/asn1/isismtt/ocsp/RequestedCertificate.cs

@@ -0,0 +1,187 @@
+using System;
+using System.IO;
+using Org.BouncyCastle.Asn1.X509;
+
+namespace Org.BouncyCastle.Asn1.IsisMtt.Ocsp
+{
+	/**
+	* ISIS-MTT-Optional: The certificate requested by the client by inserting the
+	* RetrieveIfAllowed extension in the request, will be returned in this
+	* extension.
+	* <p/>
+	* ISIS-MTT-SigG: The signature act allows publishing certificates only then,
+	* when the certificate owner gives his isExplicit permission. Accordingly, there
+	* may be <20>nondownloadable<6C> certificates, about which the responder must provide
+	* status information, but MUST NOT include them in the response. Clients may
+	* get therefore the following three kind of answers on a single request
+	* including the RetrieveIfAllowed extension:
+	* <ul>
+	* <li> a) the responder supports the extension and is allowed to publish the
+	* certificate: RequestedCertificate returned including the requested
+	* certificate</li>
+	* <li>b) the responder supports the extension but is NOT allowed to publish
+	* the certificate: RequestedCertificate returned including an empty OCTET
+	* STRING</li>
+	* <li>c) the responder does not support the extension: RequestedCertificate is
+	* not included in the response</li>
+	* </ul>
+	* Clients requesting RetrieveIfAllowed MUST be able to handle these cases. If
+	* any of the OCTET STRING options is used, it MUST contain the DER encoding of
+	* the requested certificate.
+	* <p/>
+	* <pre>
+	*            RequestedCertificate ::= CHOICE {
+	*              Certificate Certificate,
+	*              publicKeyCertificate [0] EXPLICIT OCTET STRING,
+	*              attributeCertificate [1] EXPLICIT OCTET STRING
+	*            }
+	* </pre>
+	*/
+	public class RequestedCertificate
+		: Asn1Encodable
+		//, ASN1Choice
+	{
+		public enum Choice
+		{
+			Certificate = -1,
+			PublicKeyCertificate = 0,
+			AttributeCertificate = 1
+		}
+
+		private readonly X509CertificateStructure	cert;
+		private readonly byte[]						publicKeyCert;
+		private readonly byte[]						attributeCert;
+
+		public static RequestedCertificate GetInstance(
+			object obj)
+		{
+			if (obj == null || obj is RequestedCertificate)
+			{
+				return (RequestedCertificate) obj;
+			}
+
+			if (obj is Asn1Sequence)
+			{
+				return new RequestedCertificate(X509CertificateStructure.GetInstance(obj));
+			}
+
+			if (obj is Asn1TaggedObject)
+			{
+				return new RequestedCertificate((Asn1TaggedObject) obj);
+			}
+
+			throw new ArgumentException("unknown object in factory: " + obj.GetType().Name, "obj");
+		}
+
+		public static RequestedCertificate GetInstance(
+			Asn1TaggedObject	obj,
+			bool				isExplicit)
+		{
+			if (!isExplicit)
+				throw new ArgumentException("choice item must be explicitly tagged");
+
+			return GetInstance(obj.GetObject());
+		}
+
+		private RequestedCertificate(
+			Asn1TaggedObject tagged)
+		{
+			switch ((Choice) tagged.TagNo)
+			{
+				case Choice.AttributeCertificate:
+					this.attributeCert = Asn1OctetString.GetInstance(tagged, true).GetOctets();
+					break;
+				case Choice.PublicKeyCertificate:
+					this.publicKeyCert = Asn1OctetString.GetInstance(tagged, true).GetOctets();
+					break;
+				default:
+					throw new ArgumentException("unknown tag number: " + tagged.TagNo);
+			}
+		}
+
+		/**
+		* Constructor from a given details.
+		* <p/>
+		* Only one parameter can be given. All other must be <code>null</code>.
+		*
+		* @param certificate Given as Certificate
+		*/
+		public RequestedCertificate(
+			X509CertificateStructure certificate)
+		{
+			this.cert = certificate;
+		}
+
+		public RequestedCertificate(
+			Choice	type,
+			byte[]	certificateOctets)
+			: this(new DerTaggedObject((int) type, new DerOctetString(certificateOctets)))
+		{
+		}
+
+		public Choice Type
+		{
+			get
+			{
+				if (cert != null)
+					return Choice.Certificate;
+
+				if (publicKeyCert != null)
+					return Choice.PublicKeyCertificate;
+
+				return Choice.AttributeCertificate;
+			}
+		}
+
+		public byte[] GetCertificateBytes()
+		{
+			if (cert != null)
+			{
+				try
+				{
+					return cert.GetEncoded();
+				}
+				catch (IOException e)
+				{
+					throw new InvalidOperationException("can't decode certificate: " + e);
+				}
+			}
+
+			if (publicKeyCert != null)
+				return publicKeyCert;
+
+			return attributeCert;
+		}
+    
+
+		/**
+		* Produce an object suitable for an Asn1OutputStream.
+		* <p/>
+		* Returns:
+		* <p/>
+		* <pre>
+		*            RequestedCertificate ::= CHOICE {
+		*              Certificate Certificate,
+		*              publicKeyCertificate [0] EXPLICIT OCTET STRING,
+		*              attributeCertificate [1] EXPLICIT OCTET STRING
+		*            }
+		* </pre>
+		*
+		* @return an Asn1Object
+		*/
+		public override Asn1Object ToAsn1Object()
+		{
+			if (publicKeyCert != null)
+			{
+				return new DerTaggedObject(0, new DerOctetString(publicKeyCert));
+			}
+
+			if (attributeCert != null)
+			{
+				return new DerTaggedObject(1, new DerOctetString(attributeCert));
+			}
+
+			return cert.ToAsn1Object();
+		}
+	}
+}