Extension
using System;
namespace Org.BouncyCastle.Asn1.X509
{
public class Extension : Asn1Encodable
{
private static readonly DerBoolean DefaultCritical = DerBoolean.False;
private readonly DerObjectIdentifier m_extnID;
private readonly DerBoolean m_critical;
private readonly Asn1OctetString m_extnValue;
public DerBoolean Critical => m_critical;
public DerObjectIdentifier ExtnID => m_extnID;
public Asn1OctetString ExtnValue => m_extnValue;
public static Extension GetInstance(object obj)
{
if (obj == null)
return null;
Extension extension = obj as Extension;
if (extension != null)
return extension;
return new Extension(Asn1Sequence.GetInstance(obj));
}
public static Extension GetInstance(Asn1TaggedObject taggedObject, bool declaredExplicit)
{
return new Extension(Asn1Sequence.GetInstance(taggedObject, declaredExplicit));
}
public static Extension GetTagged(Asn1TaggedObject taggedObject, bool declaredExplicit)
{
return new Extension(Asn1Sequence.GetTagged(taggedObject, declaredExplicit));
}
private Extension(Asn1Sequence seq)
{
int count = seq.Count;
int sequencePosition = 0;
if (count < 2 || count > 3)
throw new ArgumentException("Bad sequence size: " + count.ToString(), "seq");
m_extnID = DerObjectIdentifier.GetInstance(seq[sequencePosition++]);
m_critical = (Asn1Utilities.ReadOptional(seq, ref sequencePosition, DerBoolean.GetOptional) ?? DefaultCritical);
m_extnValue = Asn1OctetString.GetInstance(seq[sequencePosition++]);
if (sequencePosition != count)
throw new ArgumentException("Unexpected elements in sequence", "seq");
}
public Extension(DerObjectIdentifier extnID, DerBoolean critical, Asn1OctetString extnValue)
{
if (extnID == null)
throw new ArgumentNullException("extnID");
m_extnID = extnID;
m_critical = (critical ?? DefaultCritical);
if (extnValue == null)
throw new ArgumentNullException("extnValue");
m_extnValue = extnValue;
}
public override Asn1Object ToAsn1Object()
{
if (!DefaultCritical.Equals(m_critical))
return new DerSequence(m_extnID, m_critical, m_extnValue);
return new DerSequence(m_extnID, m_extnValue);
}
public X509Extension GetX509Extension()
{
return new X509Extension(m_critical, m_extnValue);
}
}
}