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using System;
using Org.BouncyCastle.Tls;
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;
public static ProofOfPossession GetInstance(object obj)
{
if (obj == null)
return null;
if (obj is Asn1Encodable element)
{
var result = GetOptional(element);
if (result != null)
return result;
}
throw new ArgumentException("Invalid object: " + Platform.GetTypeName(obj), nameof(obj));
}
public static ProofOfPossession GetInstance(Asn1TaggedObject taggedObject, bool declaredExplicit)
{
return Asn1Utilities.GetInstanceFromChoice(taggedObject, declaredExplicit, GetInstance);
}
public static ProofOfPossession GetOptional(Asn1Encodable element)
{
if (element == null)
throw new ArgumentNullException(nameof(element));
if (element is ProofOfPossession proofOfPossession)
return proofOfPossession;
if (element is Asn1TaggedObject taggedObject)
{
Asn1Encodable baseObject = GetOptionalBaseObject(taggedObject);
if (baseObject != null)
return new ProofOfPossession(taggedObject.TagNo, baseObject);
}
return null;
}
private static Asn1Encodable GetOptionalBaseObject(Asn1TaggedObject taggedObject)
{
if (taggedObject.HasContextTag())
{
switch (taggedObject.TagNo)
{
case 0:
return DerNull.GetInstance(taggedObject, false);
case 1:
return PopoSigningKey.GetInstance(taggedObject, false);
case 2:
case 3:
// CHOICE so explicit
return PopoPrivKey.GetInstance(taggedObject, true);
}
}
return null;
}
private readonly int m_tagNo;
private readonly Asn1Encodable m_obj;
private ProofOfPossession(int tagNo, Asn1Encodable obj)
{
m_tagNo = tagNo;
m_obj = obj ?? throw new ArgumentNullException(nameof(obj));
}
/** Creates a ProofOfPossession with type raVerified. */
public ProofOfPossession()
: this(TYPE_RA_VERIFIED, DerNull.Instance)
{
}
/** Creates a ProofOfPossession for a signing key. */
public ProofOfPossession(PopoSigningKey Poposk)
: this(TYPE_SIGNING_KEY, 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)
: this(type, (Asn1Encodable)privkey)
{
}
public virtual int Type => m_tagNo;
public virtual Asn1Encodable Object => m_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()
{
// NOTE: Explicit tagging automatically applied for PopoPrivKey (a CHOICE)
return new DerTaggedObject(false, m_tagNo, m_obj);
}
}
}
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