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using System;
using System.IO;
using Org.BouncyCastle.Asn1.X509;
using Org.BouncyCastle.Utilities;
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 �nondownloadable� 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, IAsn1Choice
{
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: " + Platform.GetTypeName(obj), "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();
}
}
}
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