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using System;
using System.Collections.Generic;
namespace Org.BouncyCastle.Asn1.X509
{
/// <remarks>Generator for X.509 extensions</remarks>
public class X509ExtensionsGenerator
{
private Dictionary<DerObjectIdentifier, X509Extension> m_extensions =
new Dictionary<DerObjectIdentifier, X509Extension>();
private List<DerObjectIdentifier> m_ordering = new List<DerObjectIdentifier>();
private static readonly ISet<DerObjectIdentifier> m_dupsAllowed = new HashSet<DerObjectIdentifier>()
{
X509Extensions.SubjectAlternativeName,
X509Extensions.IssuerAlternativeName,
X509Extensions.SubjectDirectoryAttributes,
X509Extensions.CertificateIssuer
};
/// <summary>Reset the generator</summary>
public void Reset()
{
m_extensions = new Dictionary<DerObjectIdentifier, X509Extension>();
m_ordering = new List<DerObjectIdentifier>();
}
/// <summary>
/// Add an extension with the given oid and the passed in value to be included
/// in the OCTET STRING associated with the extension.
/// </summary>
/// <param name="oid">OID for the extension.</param>
/// <param name="critical">True if critical, false otherwise.</param>
/// <param name="extValue">The ASN.1 object to be included in the extension.</param>
public void AddExtension(DerObjectIdentifier oid, bool critical, Asn1Encodable extValue)
{
byte[] encoded;
try
{
encoded = extValue.GetDerEncoded();
}
catch (Exception e)
{
throw new ArgumentException("error encoding value: " + e);
}
this.AddExtension(oid, critical, encoded);
}
/// <summary>
/// Add an extension with the given oid and the passed in byte array to be wrapped
/// in the OCTET STRING associated with the extension.
/// </summary>
/// <param name="oid">OID for the extension.</param>
/// <param name="critical">True if critical, false otherwise.</param>
/// <param name="extValue">The byte array to be wrapped.</param>
public void AddExtension(DerObjectIdentifier oid, bool critical, byte[] extValue)
{
if (m_extensions.TryGetValue(oid, out X509Extension existingExtension))
{
if (!m_dupsAllowed.Contains(oid))
throw new ArgumentException("extension " + oid + " already added");
Asn1Sequence seq1 = Asn1Sequence.GetInstance(
Asn1OctetString.GetInstance(existingExtension.Value).GetOctets());
Asn1EncodableVector items = Asn1EncodableVector.FromEnumerable(seq1);
Asn1Sequence seq2 = Asn1Sequence.GetInstance(extValue);
foreach (Asn1Encodable enc in seq2)
{
items.Add(enc);
}
m_extensions[oid] = new X509Extension(existingExtension.IsCritical,
new DerOctetString(new DerSequence(items).GetEncoded()));
}
else
{
m_ordering.Add(oid);
m_extensions.Add(oid, new X509Extension(critical, new DerOctetString(extValue)));
}
}
public void AddExtensions(X509Extensions extensions)
{
foreach (DerObjectIdentifier ident in extensions.ExtensionOids)
{
X509Extension ext = extensions.GetExtension(ident);
AddExtension(ident, ext.critical, ext.Value.GetOctets());
}
}
/// <summary>Return true if there are no extension present in this generator.</summary>
/// <returns>True if empty, false otherwise</returns>
public bool IsEmpty
{
get { return m_ordering.Count < 1; }
}
/// <summary>Generate an X509Extensions object based on the current state of the generator.</summary>
/// <returns>An <c>X509Extensions</c> object</returns>
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 + " already added");
m_ordering.Add(oid);
m_extensions.Add(oid, x509Extension);
}
}
}
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