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

using System;

namespace Org.BouncyCastle.Asn1.Cms{
  public class RecipientEncryptedKey
    : Asn1Encodable
  {
    private readonly KeyAgreeRecipientIdentifier identifier;
    private readonly Asn1OctetString encryptedKey;

    private RecipientEncryptedKey(
      Asn1Sequence seq)
    {
      identifier = KeyAgreeRecipientIdentifier.GetInstance(seq[0]);
      encryptedKey = (Asn1OctetString) seq[1];
    }

    /**
     * return an RecipientEncryptedKey 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 RecipientEncryptedKey GetInstance(
      Asn1TaggedObject  obj,
      bool        isExplicit)
    {
      return GetInstance(Asn1Sequence.GetInstance(obj, isExplicit));
    }

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

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

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

    public RecipientEncryptedKey(
      KeyAgreeRecipientIdentifier  id,
      Asn1OctetString        encryptedKey)
    {
      this.identifier = id;
      this.encryptedKey = encryptedKey;
    }

    public KeyAgreeRecipientIdentifier Identifier
    {
      get { return identifier; }
    }

    public Asn1OctetString EncryptedKey
    {
      get { return encryptedKey; }
    }

    /** 
     * Produce an object suitable for an Asn1OutputStream.
     * <pre>
     * RecipientEncryptedKey ::= SEQUENCE {
     *     rid KeyAgreeRecipientIdentifier,
     *     encryptedKey EncryptedKey
     * }
     * </pre>
     */
    public override Asn1Object ToAsn1Object()
    {
      return new DerSequence(identifier, encryptedKey);
    }
  }
}