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using System;
using Org.BouncyCastle.Utilities;
namespace Org.BouncyCastle.Asn1.Crmf
{
public class ProofOfPossession
: Asn1Encodable, IAsn1Choice
{
public const int TYPE_RA_VERIFIED = 0;
public const int TYPE_SIGNING_KEY = 1;
public const int TYPE_KEY_ENCIPHERMENT = 2;
public const int TYPE_KEY_AGREEMENT = 3;
private readonly int tagNo;
private readonly Asn1Encodable obj;
private ProofOfPossession(Asn1TaggedObject tagged)
{
tagNo = tagged.TagNo;
switch (tagNo)
{
case 0:
obj = DerNull.Instance;
break;
case 1:
obj = PopoSigningKey.GetInstance(tagged, false);
break;
case 2:
case 3:
// CHOICE so explicit
obj = PopoPrivKey.GetInstance(tagged, true);
break;
default:
throw new ArgumentException("unknown tag: " + tagNo, "tagged");
}
}
public static ProofOfPossession GetInstance(object obj)
{
if (obj is ProofOfPossession)
return (ProofOfPossession)obj;
if (obj is Asn1TaggedObject)
return new ProofOfPossession((Asn1TaggedObject)obj);
throw new ArgumentException("Invalid object: " + Platform.GetTypeName(obj), "obj");
}
/** Creates a ProofOfPossession with type raVerified. */
public ProofOfPossession()
{
tagNo = TYPE_RA_VERIFIED;
obj = DerNull.Instance;
}
/** Creates a ProofOfPossession for a signing key. */
public ProofOfPossession(PopoSigningKey Poposk)
{
tagNo = TYPE_SIGNING_KEY;
obj = Poposk;
}
/**
* Creates a ProofOfPossession for key encipherment or agreement.
* @param type one of TYPE_KEY_ENCIPHERMENT or TYPE_KEY_AGREEMENT
*/
public ProofOfPossession(int type, PopoPrivKey privkey)
{
tagNo = type;
obj = privkey;
}
public virtual int Type
{
get { return tagNo; }
}
public virtual Asn1Encodable Object
{
get { return obj; }
}
/**
* <pre>
* ProofOfPossession ::= CHOICE {
* raVerified [0] NULL,
* -- used if the RA has already verified that the requester is in
* -- possession of the private key
* signature [1] PopoSigningKey,
* keyEncipherment [2] PopoPrivKey,
* keyAgreement [3] PopoPrivKey }
* </pre>
* @return a basic ASN.1 object representation.
*/
public override Asn1Object ToAsn1Object()
{
return new DerTaggedObject(false, tagNo, obj);
}
}
}
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