SignerAttribute.cs :  » PDF » iTextSharp » Org » BouncyCastle » Asn1 » Esf » C# / CSharp Open Source

using System;

using Org.BouncyCastle.Asn1.X509;

namespace Org.BouncyCastle.Asn1.Esf{
  public class SignerAttribute
    : Asn1Encodable
  {
    private Asn1Sequence      claimedAttributes;
    private AttributeCertificate  certifiedAttributes;

    public static SignerAttribute GetInstance(
      object obj)
    {
      if (obj == null || obj is SignerAttribute)
        return (SignerAttribute) obj;

      if (obj is Asn1Sequence)
        return new SignerAttribute(obj);

      throw new ArgumentException(
        "Unknown object in 'SignerAttribute' factory: "
        + obj.GetType().Name,
        "obj");
    }

    private SignerAttribute(
      object obj)
    {
      Asn1Sequence seq = (Asn1Sequence) obj;
      DerTaggedObject taggedObject = (DerTaggedObject) seq[0];
      if (taggedObject.TagNo == 0)
      {
        claimedAttributes = Asn1Sequence.GetInstance(taggedObject, true);
      }
      else if (taggedObject.TagNo == 1)
      {
        certifiedAttributes = AttributeCertificate.GetInstance(taggedObject);
      }
      else
      {
        throw new ArgumentException("illegal tag.", "obj");
      }
    }

    public SignerAttribute(
      Asn1Sequence claimedAttributes)
    {
      this.claimedAttributes = claimedAttributes;
    }

    public SignerAttribute(
      AttributeCertificate certifiedAttributes)
    {
      this.certifiedAttributes = certifiedAttributes;
    }

    public virtual Asn1Sequence ClaimedAttributes
    {
      get { return claimedAttributes; }
    }

    public virtual AttributeCertificate CertifiedAttributes
    {
      get { return certifiedAttributes; }
    }

    /**
    *
    * <pre>
    *  SignerAttribute ::= SEQUENCE OF CHOICE {
    *      claimedAttributes   [0] ClaimedAttributes,
    *      certifiedAttributes [1] CertifiedAttributes }
    *
    *  ClaimedAttributes ::= SEQUENCE OF Attribute
    *  CertifiedAttributes ::= AttributeCertificate -- as defined in RFC 3281: see clause 4.1.
    * </pre>
    */
    public override Asn1Object ToAsn1Object()
    {
      Asn1EncodableVector v = new Asn1EncodableVector();

      if (claimedAttributes != null)
      {
        v.Add(new DerTaggedObject(0, claimedAttributes));
      }
      else
      {
        v.Add(new DerTaggedObject(1, certifiedAttributes));
      }

      return new DerSequence(v);
    }
  }
}