RecipientKeyIdentifier.cs :  » PDF » iTextSharp » Org » BouncyCastle » Asn1 » Cms » C# / CSharp Open Source

using System;

using Org.BouncyCastle.Asn1;

namespace Org.BouncyCastle.Asn1.Cms{
    public class RecipientKeyIdentifier
        : Asn1Encodable
    {
        private Asn1OctetString      subjectKeyIdentifier;
        private DerGeneralizedTime   date;
        private OtherKeyAttribute    other;

    public RecipientKeyIdentifier(
            Asn1OctetString         subjectKeyIdentifier,
            DerGeneralizedTime      date,
            OtherKeyAttribute       other)
        {
            this.subjectKeyIdentifier = subjectKeyIdentifier;
            this.date = date;
            this.other = other;
        }

    public RecipientKeyIdentifier(
            Asn1Sequence seq)
        {
            subjectKeyIdentifier = Asn1OctetString.GetInstance(
        seq[0]);

      switch(seq.Count)
            {
        case 1:
          break;
        case 2:
          if (seq[1] is DerGeneralizedTime)
          {
            date = (DerGeneralizedTime) seq[1];
          }
          else
          {
            other = OtherKeyAttribute.GetInstance(seq[2]);
          }
          break;
        case 3:
          date  = (DerGeneralizedTime) seq[1];
          other = OtherKeyAttribute.GetInstance(seq[2]);
          break;
        default:
          throw new ArgumentException("Invalid RecipientKeyIdentifier");
            }
        }

    /**
         * return a RecipientKeyIdentifier object from a tagged object.
         *
         * @param _ato the tagged object holding the object we want.
         * @param _explicit true if the object is meant to be explicitly
         *              tagged false otherwise.
         * @exception ArgumentException if the object held by the
         *          tagged object cannot be converted.
         */
        public static RecipientKeyIdentifier GetInstance(
      Asn1TaggedObject  ato,
      bool        explicitly)
    {
            return GetInstance(Asn1Sequence.GetInstance(ato, explicitly));
        }

    /**
         * return a RecipientKeyIdentifier object from the given object.
         *
         * @param _obj the object we want converted.
         * @exception ArgumentException if the object cannot be converted.
         */
        public static RecipientKeyIdentifier GetInstance(
      object obj)
    {
            if (obj == null || obj is RecipientKeyIdentifier)
      {
                return (RecipientKeyIdentifier) obj;
            }

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

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

    public Asn1OctetString SubjectKeyIdentifier
    {
      get { return subjectKeyIdentifier; }
    }

    public DerGeneralizedTime Date
    {
      get { return date; }
    }

    public OtherKeyAttribute OtherKeyAttribute
    {
      get { return other; }
    }

    /**
         * Produce an object suitable for an Asn1OutputStream.
         * <pre>
         * RecipientKeyIdentifier ::= Sequence {
         *     subjectKeyIdentifier SubjectKeyIdentifier,
         *     date GeneralizedTime OPTIONAL,
         *     other OtherKeyAttribute OPTIONAL
         * }
         *
         * SubjectKeyIdentifier ::= OCTET STRING
         * </pre>
         */
        public override Asn1Object ToAsn1Object()
        {
            Asn1EncodableVector v = new Asn1EncodableVector(subjectKeyIdentifier);

      if (date != null)
            {
                v.Add(date);
            }

      if (other != null)
            {
                v.Add(other);
            }

      return new DerSequence(v);
        }
    }
}