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

using System;

using Org.BouncyCastle.Asn1;

namespace Org.BouncyCastle.Asn1.Cms{
    public class RecipientInfo
        : Asn1Encodable, IAsn1Choice
    {
        internal Asn1Encodable info;

    public RecipientInfo(
            KeyTransRecipientInfo info)
        {
            this.info = info;
        }

    public RecipientInfo(
            KeyAgreeRecipientInfo info)
        {
            this.info = new DerTaggedObject(false, 1, info);
        }

    public RecipientInfo(
            KekRecipientInfo info)
        {
            this.info = new DerTaggedObject(false, 2, info);
        }

    public RecipientInfo(
            PasswordRecipientInfo info)
        {
            this.info = new DerTaggedObject(false, 3, info);
        }

    public RecipientInfo(
            OtherRecipientInfo info)
        {
            this.info = new DerTaggedObject(false, 4, info);
        }

    public RecipientInfo(
            Asn1Object   info)
        {
            this.info = info;
        }

    public static RecipientInfo GetInstance(
            object o)
        {
            if (o == null || o is RecipientInfo)
            {
                return (RecipientInfo) o;
            }

      if (o is Asn1Sequence)
            {
                return new RecipientInfo((Asn1Sequence) o);
            }

      if (o is Asn1TaggedObject)
            {
                return new RecipientInfo((Asn1TaggedObject) o);
            }

      throw new ArgumentException("unknown object in factory: " + o.GetType().Name);
        }

    public DerInteger Version
        {
      get
      {
        if (info is Asn1TaggedObject)
        {
          Asn1TaggedObject o = (Asn1TaggedObject) info;

          switch (o.TagNo)
          {
            case 1:
              return KeyAgreeRecipientInfo.GetInstance(o, false).Version;
            case 2:
              return GetKekInfo(o).Version;
            case 3:
              return PasswordRecipientInfo.GetInstance(o, false).Version;
            case 4:
              return new DerInteger(0);    // no syntax version for OtherRecipientInfo
            default:
              throw new InvalidOperationException("unknown tag");
          }
        }

        return KeyTransRecipientInfo.GetInstance(info).Version;
      }
        }

    public bool IsTagged
    {
      get { return info is Asn1TaggedObject; }
    }

    public Asn1Encodable Info
        {
      get
      {
        if (info is Asn1TaggedObject)
        {
          Asn1TaggedObject o = (Asn1TaggedObject) info;

          switch (o.TagNo)
          {
            case 1:
              return KeyAgreeRecipientInfo.GetInstance(o, false);
            case 2:
              return GetKekInfo(o);
            case 3:
              return PasswordRecipientInfo.GetInstance(o, false);
            case 4:
              return OtherRecipientInfo.GetInstance(o, false);
            default:
              throw new InvalidOperationException("unknown tag");
          }
        }

        return KeyTransRecipientInfo.GetInstance(info);
      }
        }

    private KekRecipientInfo GetKekInfo(
      Asn1TaggedObject o)
    {
      // For compatibility with erroneous version, we don't always pass 'false' here
      return KekRecipientInfo.GetInstance(o, o.IsExplicit());
    }

    /**
         * Produce an object suitable for an Asn1OutputStream.
         * <pre>
         * RecipientInfo ::= CHOICE {
         *     ktri KeyTransRecipientInfo,
         *     kari [1] KeyAgreeRecipientInfo,
         *     kekri [2] KekRecipientInfo,
         *     pwri [3] PasswordRecipientInfo,
         *     ori [4] OtherRecipientInfo }
         * </pre>
         */
        public override Asn1Object ToAsn1Object()
        {
            return info.ToAsn1Object();
        }
    }
}