Signature.cs :  » PDF » iTextSharp » Org » BouncyCastle » Asn1 » Ocsp » C# / CSharp Open Source

using System;

using Org.BouncyCastle.Asn1;
using Org.BouncyCastle.Asn1.X509;

namespace Org.BouncyCastle.Asn1.Ocsp{
    public class Signature
        : Asn1Encodable
    {
        internal AlgorithmIdentifier  signatureAlgorithm;
        internal DerBitString      signatureValue;
        internal Asn1Sequence      certs;

    public static Signature GetInstance(
      Asn1TaggedObject  obj,
      bool        explicitly)
    {
      return GetInstance(Asn1Sequence.GetInstance(obj, explicitly));
    }

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

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

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

    public Signature(
            AlgorithmIdentifier signatureAlgorithm,
            DerBitString        signatureValue)
      : this(signatureAlgorithm, signatureValue, null)
        {
        }

    public Signature(
            AlgorithmIdentifier  signatureAlgorithm,
            DerBitString    signatureValue,
            Asn1Sequence    certs)
        {
      if (signatureAlgorithm == null)
        throw new ArgumentException("signatureAlgorithm");
      if (signatureValue == null)
        throw new ArgumentException("signatureValue");

      this.signatureAlgorithm = signatureAlgorithm;
            this.signatureValue = signatureValue;
            this.certs = certs;
        }

    private Signature(
            Asn1Sequence seq)
        {
            signatureAlgorithm = AlgorithmIdentifier.GetInstance(seq[0]);
            signatureValue = (DerBitString)seq[1];

      if (seq.Count == 3)
            {
                certs = Asn1Sequence.GetInstance(
          (Asn1TaggedObject)seq[2], true);
            }
        }

    public AlgorithmIdentifier SignatureAlgorithm
    {
      get { return signatureAlgorithm; }
    }

    public DerBitString SignatureValue
    {
      get { return signatureValue; }
    }

    public Asn1Sequence Certs
    {
      get { return certs; }
    }

    /**
         * Produce an object suitable for an Asn1OutputStream.
         * <pre>
         * Signature       ::=     Sequence {
         *     signatureAlgorithm      AlgorithmIdentifier,
         *     signature               BIT STRING,
         *     certs               [0] EXPLICIT Sequence OF Certificate OPTIONAL}
         * </pre>
         */
        public override Asn1Object ToAsn1Object()
        {
            Asn1EncodableVector v = new Asn1EncodableVector(
        signatureAlgorithm, signatureValue);

      if (certs != null)
            {
                v.Add(new DerTaggedObject(true, 0, certs));
            }

      return new DerSequence(v);
        }
    }
}