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using System;
namespace Org.BouncyCastle.Asn1.X509
{
public class AlgorithmIdentifier
: Asn1Encodable
{
private readonly DerObjectIdentifier objectID;
private readonly Asn1Encodable parameters;
private readonly bool parametersDefined;
public static AlgorithmIdentifier GetInstance(
Asn1TaggedObject obj,
bool explicitly)
{
return GetInstance(Asn1Sequence.GetInstance(obj, explicitly));
}
public static AlgorithmIdentifier GetInstance(
object obj)
{
if (obj == null || obj is AlgorithmIdentifier)
return (AlgorithmIdentifier) obj;
if (obj is DerObjectIdentifier)
return new AlgorithmIdentifier((DerObjectIdentifier) obj);
if (obj is string)
return new AlgorithmIdentifier((string) obj);
if (obj is Asn1Sequence)
return new AlgorithmIdentifier((Asn1Sequence) obj);
throw new ArgumentException("unknown object in factory: " + obj.GetType().Name, "obj");
}
public AlgorithmIdentifier(
DerObjectIdentifier objectID)
{
this.objectID = objectID;
}
public AlgorithmIdentifier(
string objectID)
{
this.objectID = new DerObjectIdentifier(objectID);
}
public AlgorithmIdentifier(
DerObjectIdentifier objectID,
Asn1Encodable parameters)
{
this.objectID = objectID;
this.parameters = parameters;
this.parametersDefined = true;
}
internal AlgorithmIdentifier(
Asn1Sequence seq)
{
if (seq.Count < 1 || seq.Count > 2)
throw new ArgumentException("Bad sequence size: " + seq.Count);
this.objectID = DerObjectIdentifier.GetInstance(seq[0]);
this.parametersDefined = (seq.Count == 2);
if (parametersDefined)
{
this.parameters = seq[1];
}
}
public virtual DerObjectIdentifier ObjectID
{
get { return objectID; }
}
public Asn1Encodable Parameters
{
get { return parameters; }
}
/**
* Produce an object suitable for an Asn1OutputStream.
* <pre>
* AlgorithmIdentifier ::= Sequence {
* algorithm OBJECT IDENTIFIER,
* parameters ANY DEFINED BY algorithm OPTIONAL }
* </pre>
*/
public override Asn1Object ToAsn1Object()
{
Asn1EncodableVector v = new Asn1EncodableVector(objectID);
if (parametersDefined)
{
if (parameters != null)
{
v.Add(parameters);
}
else
{
v.Add(DerNull.Instance);
}
}
return new DerSequence(v);
}
}
}
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