X509ExtensionsGenerator
using System;
using System.Collections.Generic;
namespace Org.BouncyCastle.Asn1.X509
{
public class X509ExtensionsGenerator
{
private Dictionary<DerObjectIdentifier, X509Extension> m_extensions = new Dictionary<DerObjectIdentifier, X509Extension>();
private List<DerObjectIdentifier> m_ordering = new List<DerObjectIdentifier>();
private static readonly HashSet<DerObjectIdentifier> m_dupsAllowed = new HashSet<DerObjectIdentifier> {
X509Extensions.SubjectAlternativeName,
X509Extensions.IssuerAlternativeName,
X509Extensions.SubjectDirectoryAttributes,
X509Extensions.CertificateIssuer
};
public bool IsEmpty => m_ordering.Count < 1;
public void Reset()
{
m_extensions = new Dictionary<DerObjectIdentifier, X509Extension>();
m_ordering = new List<DerObjectIdentifier>();
}
public void AddExtension(DerObjectIdentifier oid, bool critical, Asn1Encodable extValue)
{
byte[] derEncoded;
try {
derEncoded = extValue.GetDerEncoded();
} catch (Exception ex) {
throw new ArgumentException("error encoding value: " + ex?.ToString());
}
AddExtension(oid, critical, derEncoded);
}
public void AddExtension(DerObjectIdentifier oid, bool critical, byte[] extValue)
{
if (!m_extensions.TryGetValue(oid, out X509Extension value)) {
m_ordering.Add(oid);
m_extensions.Add(oid, new X509Extension(critical, new DerOctetString(extValue)));
} else {
if (!m_dupsAllowed.Contains(oid))
throw new ArgumentException("extension " + oid?.ToString() + " already added");
Asn1Sequence instance = Asn1Sequence.GetInstance(value.Value.GetOctets());
Asn1Sequence instance2 = Asn1Sequence.GetInstance(extValue);
DerSequence derSequence = DerSequence.Concatenate(instance, instance2);
m_extensions[oid] = new X509Extension(value.IsCritical | critical, new DerOctetString(derSequence.GetEncoded("DER")));
}
}
public void AddExtensions(X509Extensions extensions)
{
foreach (DerObjectIdentifier extensionOid in extensions.ExtensionOids) {
X509Extension extension = extensions.GetExtension(extensionOid);
AddExtension(extensionOid, extension.critical, extension.Value.GetOctets());
}
}
public X509Extensions Generate()
{
return new X509Extensions(m_ordering, m_extensions);
}
internal void AddExtension(DerObjectIdentifier oid, X509Extension x509Extension)
{
if (m_extensions.ContainsKey(oid))
throw new ArgumentException("extension " + oid?.ToString() + " already added");
m_ordering.Add(oid);
m_extensions.Add(oid, x509Extension);
}
}
}