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

using System;

namespace Org.BouncyCastle.Asn1.Cms{
  public class KeyAgreeRecipientIdentifier
    : Asn1Encodable, IAsn1Choice
  {
    /**
     * return an KeyAgreeRecipientIdentifier object from a tagged object.
     *
     * @param obj the tagged object holding the object we want.
     * @param isExplicit 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 KeyAgreeRecipientIdentifier GetInstance(
      Asn1TaggedObject  obj,
      bool        isExplicit)
    {
      return GetInstance(Asn1Sequence.GetInstance(obj, isExplicit));
    }
    
    /**
     * return an KeyAgreeRecipientIdentifier object from the given object.
     *
     * @param obj the object we want converted.
     * @exception ArgumentException if the object cannot be converted.
     */
    public static KeyAgreeRecipientIdentifier GetInstance(
      object obj)
    {
      if (obj == null || obj is KeyAgreeRecipientIdentifier)
      {
        return (KeyAgreeRecipientIdentifier)obj;
      }

      if (obj is Asn1Sequence)
      {
        return new KeyAgreeRecipientIdentifier(IssuerAndSerialNumber.GetInstance(obj));
      }

      if (obj is Asn1TaggedObject && ((Asn1TaggedObject)obj).TagNo == 0)
      {
        return new KeyAgreeRecipientIdentifier(RecipientKeyIdentifier.GetInstance(
          (Asn1TaggedObject)obj, false));
      }

      throw new ArgumentException("Invalid KeyAgreeRecipientIdentifier: " + obj.GetType().FullName, "obj");
    } 

    private readonly IssuerAndSerialNumber issuerSerial;
    private readonly RecipientKeyIdentifier rKeyID;

    public KeyAgreeRecipientIdentifier(
      IssuerAndSerialNumber issuerSerial)
    {
      this.issuerSerial = issuerSerial;
    }

    public KeyAgreeRecipientIdentifier(
      RecipientKeyIdentifier rKeyID)
    {
      this.rKeyID = rKeyID;
    }

    public IssuerAndSerialNumber IssuerAndSerialNumber
    {
      get { return issuerSerial; }
    }

    public RecipientKeyIdentifier RKeyID
    {
      get { return rKeyID; }
    }

    /** 
     * Produce an object suitable for an Asn1OutputStream.
     * <pre>
     * KeyAgreeRecipientIdentifier ::= CHOICE {
     *     issuerAndSerialNumber IssuerAndSerialNumber,
     *     rKeyId [0] IMPLICIT RecipientKeyIdentifier
     * }
     * </pre>
     */
    public override Asn1Object ToAsn1Object()
    {
      if (issuerSerial != null)
      {
        return issuerSerial.ToAsn1Object();
      }

      return new DerTaggedObject(false, 0, rKeyID);
    }
  }
}