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using System;
using Org.BouncyCastle.Asn1.X509;
namespace Org.BouncyCastle.Asn1.BC
{
/**
* Extension to tie an alternate certificate to the containing certificate.
* <pre>
* LinkedCertificate := SEQUENCE {
* digest DigestInfo, -- digest of PQC certificate
* certLocation GeneralName, -- location of PQC certificate
* certIssuer [0] Name OPTIONAL, -- issuer of PQC cert (if different from current certificate)
* cACerts [1] GeneralNames OPTIONAL, -- CA certificates for PQC cert (one of more locations)
* }
* </pre>
*/
public class LinkedCertificate
: Asn1Encodable
{
public static LinkedCertificate GetInstance(object obj)
{
if (obj == null)
return null;
if (obj is LinkedCertificate linkedCertificate)
return linkedCertificate;
return new LinkedCertificate(Asn1Sequence.GetInstance(obj));
}
public static LinkedCertificate GetInstance(Asn1TaggedObject taggedObject, bool declaredExplicit)
{
return new LinkedCertificate(Asn1Sequence.GetInstance(taggedObject, declaredExplicit));
}
private readonly DigestInfo m_digest;
private readonly GeneralName m_certLocation;
private readonly X509Name m_certIssuer;
private readonly GeneralNames m_cACerts;
public LinkedCertificate(DigestInfo digest, GeneralName certLocation)
: this(digest, certLocation, null, null)
{
}
public LinkedCertificate(DigestInfo digest, GeneralName certLocation, X509Name certIssuer, GeneralNames caCerts)
{
m_digest = digest ?? throw new ArgumentNullException(nameof(digest));
m_certLocation = certLocation ?? throw new ArgumentNullException(nameof(certLocation));
m_certIssuer = certIssuer;
m_cACerts = caCerts;
}
private LinkedCertificate(Asn1Sequence seq)
{
int count = seq.Count;
if (count < 2 || count > 4)
throw new ArgumentException("Bad sequence size: " + count, nameof(seq));
int pos = 0;
m_digest = DigestInfo.GetInstance(seq[pos++]);
m_certLocation = GeneralName.GetInstance(seq[pos++]);
m_certIssuer = Asn1Utilities.ReadOptionalContextTagged(seq, ref pos, 0, false, X509Name.GetInstance);
m_cACerts = Asn1Utilities.ReadOptionalContextTagged(seq, ref pos, 1, false, GeneralNames.GetInstance);
if (pos != count)
throw new ArgumentException("Unexpected elements in sequence", nameof(seq));
}
public virtual DigestInfo Digest => m_digest;
public virtual GeneralName CertLocation => m_certLocation;
public virtual X509Name CertIssuer => m_certIssuer;
public virtual GeneralNames CACerts => m_cACerts;
public override Asn1Object ToAsn1Object()
{
Asn1EncodableVector v = new Asn1EncodableVector(4);
v.Add(m_digest, m_certLocation);
v.AddOptionalTagged(false, 0, m_certIssuer);
v.AddOptionalTagged(false, 1, m_cACerts);
return new DerSequence(v);
}
}
}
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