ExtendedKeyUsage.cs :  » PDF » iTextSharp » Org » BouncyCastle » Asn1 » X509 » C# / CSharp Open Source

using System;
using System.Collections;

namespace Org.BouncyCastle.Asn1.X509{
    /**
     * The extendedKeyUsage object.
     * <pre>
     *      extendedKeyUsage ::= Sequence SIZE (1..MAX) OF KeyPurposeId
     * </pre>
     */
    public class ExtendedKeyUsage
        : Asn1Encodable
    {
        internal readonly Hashtable usageTable = new Hashtable();
        internal readonly Asn1Sequence seq;

    public static ExtendedKeyUsage GetInstance(
            Asn1TaggedObject  obj,
            bool        explicitly)
        {
            return GetInstance(Asn1Sequence.GetInstance(obj, explicitly));
        }

    public static ExtendedKeyUsage GetInstance(
            object obj)
        {
            if (obj is ExtendedKeyUsage)
            {
                return (ExtendedKeyUsage) obj;
            }

      if (obj is Asn1Sequence)
            {
                return new ExtendedKeyUsage((Asn1Sequence) obj);
            }

      if (obj is X509Extension)
      {
        return GetInstance(X509Extension.ConvertValueToObject((X509Extension) obj));
      }

      throw new ArgumentException("Invalid ExtendedKeyUsage: " + obj.GetType().Name);
        }

    private ExtendedKeyUsage(
            Asn1Sequence seq)
        {
            this.seq = seq;

      foreach (object o in seq)
      {
        if (!(o is DerObjectIdentifier))
          throw new ArgumentException("Only DerObjectIdentifier instances allowed in ExtendedKeyUsage.");

        this.usageTable.Add(o, o);
            }
        }

    public ExtendedKeyUsage(
      params KeyPurposeID[] usages)
    {
      this.seq = new DerSequence(usages);

      foreach (KeyPurposeID usage in usages)
      {
        this.usageTable.Add(usage, usage);
      }
    }

    public ExtendedKeyUsage(
            ArrayList usages)
        {
            Asn1EncodableVector v = new Asn1EncodableVector();

      foreach (Asn1Object o in usages)
            {
        v.Add(o);

        this.usageTable.Add(o, o);
            }

      this.seq = new DerSequence(v);
        }

    public bool HasKeyPurposeId(
            KeyPurposeID keyPurposeId)
        {
            return usageTable[keyPurposeId] != null;
        }

    /**
     * Returns all extended key usages.
     * The returned ArrayList contains DerObjectIdentifier instances.
     * @return An ArrayList with all key purposes.
     */
    public ArrayList GetUsages()
    {
      return new ArrayList(usageTable.Values);
    }

    [Obsolete("Use 'Count' property instead")]
    public int Size
    {
      get { return usageTable.Count; }
    }

    public int Count
    {
      get { return usageTable.Count; }
    }

    public override Asn1Object ToAsn1Object()
        {
            return seq;
        }
    }
}