public IssuerAndSerialNumber(
     X509Name	name,
     BigInteger	certSerialNumber)
 {
     this.name = name;
     this.certSerialNumber = new DerInteger(certSerialNumber);
 }

		public RsassaPssParameters(
			Asn1Sequence seq)
		{
			hashAlgorithm = DefaultHashAlgorithm;
			maskGenAlgorithm = DefaultMaskGenFunction;
			saltLength = DefaultSaltLength;
			trailerField = DefaultTrailerField;

			for (int i = 0; i != seq.Count; i++)
			{
				Asn1TaggedObject o = (Asn1TaggedObject)seq[i];

				switch (o.TagNo)
				{
					case 0:
						hashAlgorithm = AlgorithmIdentifier.GetInstance(o, true);
						break;
					case 1:
						maskGenAlgorithm = AlgorithmIdentifier.GetInstance(o, true);
						break;
					case 2:
						saltLength = DerInteger.GetInstance(o, true);
						break;
					case 3:
						trailerField = DerInteger.GetInstance(o, true);
						break;
					default:
						throw new ArgumentException("unknown tag");
				}
			}
		}

		public RC2CbcParameter(
            int		parameterVersion,
            byte[]	iv)
        {
            this.version = new DerInteger(parameterVersion);
            this.iv = new DerOctetString(iv);
        }

		public Pkcs12PbeParams(
            byte[]	salt,
            int		iterations)
        {
            this.iv = new DerOctetString(salt);
            this.iterations = new DerInteger(iterations);
        }

        public Pbkdf2Params(
            Asn1Sequence seq)
        {
            if (seq.Count < 2 || seq.Count > 4)
                throw new ArgumentException("Wrong number of elements in sequence", "seq");

            this.octStr = (Asn1OctetString)seq[0];
            this.iterationCount = (DerInteger)seq[1];

            Asn1Encodable kl = null, d = null;
            if (seq.Count > 3)
            {
                kl = seq[2];
                d = seq[3];
            }
            else if (seq.Count > 2)
            {
                if (seq[2] is DerInteger)
                {
                    kl = seq[2];
                }
                else
                {
                    d = seq[2];
                }
            }
            if (kl != null)
            {
                keyLength = (DerInteger)kl;
            }
            if (d != null)
            {
                prf = AlgorithmIdentifier.GetInstance(d);
            }
        }

        private static Asn1EncodableVector ConvertVector(IList numbers)
        {
            Asn1EncodableVector av = new Asn1EncodableVector();

            foreach (object o in numbers)
            {
                DerInteger di;

                if (o is BigInteger)
                {
                    di = new DerInteger((BigInteger)o);
                }
                else if (o is int)
                {
                    di = new DerInteger((int)o);
                }
                else
                {
                    throw new ArgumentException();
                }

                av.Add(di);
            }
            return av;
        }

		public CompressedData(
            Asn1Sequence seq)
        {
            this.version = (DerInteger) seq[0];
            this.compressionAlgorithm = AlgorithmIdentifier.GetInstance(seq[1]);
            this.encapContentInfo = ContentInfo.GetInstance(seq[2]);
        }

		private CertResponse(Asn1Sequence seq)
		{
			certReqId = DerInteger.GetInstance(seq[0]);
			status = PkiStatusInfo.GetInstance(seq[1]);

			if (seq.Count >= 3)
			{
				if (seq.Count == 3)
				{
					Asn1Encodable o = seq[2];
					if (o is Asn1OctetString)
					{
						rspInfo = Asn1OctetString.GetInstance(o);
					}
					else
					{
						certifiedKeyPair = CertifiedKeyPair.GetInstance(o);
					}
				}
				else
				{
					certifiedKeyPair = CertifiedKeyPair.GetInstance(seq[2]);
					rspInfo = Asn1OctetString.GetInstance(seq[3]);
				}
			}
		}

        public override void PerformTest()
        {
            DerInteger val = new DerInteger(9);

            DerApplicationSpecific tagged = new DerApplicationSpecific(false, 3, val);

            if (!AreEqual(impData, tagged.GetEncoded()))
            {
                Fail("implicit encoding failed");
            }

            DerInteger recVal = (DerInteger) tagged.GetObject(Asn1Tags.Integer);

            if (!val.Equals(recVal))
            {
                Fail("implicit read back failed");
            }

            DerApplicationSpecific certObj = (DerApplicationSpecific)
                Asn1Object.FromByteArray(certData);

            if (!certObj.IsConstructed() || certObj.ApplicationTag != 33)
            {
                Fail("parsing of certificate data failed");
            }

            byte[] encoded = certObj.GetDerEncoded();

            if (!Arrays.AreEqual(certData, encoded))
            {
                Console.WriteLine(Encoding.ASCII.GetString(certData, 0, certData.Length).Substring(0, 20));
                Console.WriteLine(Encoding.ASCII.GetString(encoded, 0, encoded.Length).Substring(0, 20));
                Fail("re-encoding of certificate data failed");
            }
        }

		public AuthenticatedData(
			OriginatorInfo		originatorInfo,
			Asn1Set				recipientInfos,
			AlgorithmIdentifier	macAlgorithm,
			AlgorithmIdentifier	digestAlgorithm,
			ContentInfo			encapsulatedContent,
			Asn1Set				authAttrs,
			Asn1OctetString		mac,
			Asn1Set				unauthAttrs)
		{
			if (digestAlgorithm != null || authAttrs != null)
			{
				if (digestAlgorithm == null || authAttrs == null)
				{
					throw new ArgumentException("digestAlgorithm and authAttrs must be set together");
				}
			}

			version = new DerInteger(CalculateVersion(originatorInfo));

			this.originatorInfo = originatorInfo;
			this.macAlgorithm = macAlgorithm;
			this.digestAlgorithm = digestAlgorithm;
			this.recipientInfos = recipientInfos;
			this.encapsulatedContentInfo = encapsulatedContent;
			this.authAttrs = authAttrs;
			this.mac = mac;
			this.unauthAttrs = unauthAttrs;
		}

		public DHPublicKey(DerInteger y)
		{
			if (y == null)
				throw new ArgumentNullException("y");

			this.y = y;
		}

		public IssuerSerial(
			GeneralNames	issuer,
			DerInteger		serial)
		{
			this.issuer = issuer;
			this.serial = serial;
		}

        /**
         * @param status
         * @param statusString
         */
        public PkiStatusInfo(
			int			status,
			PkiFreeText	statusString)
        {
            this.status = new DerInteger(status);
            this.statusString = statusString;
        }

		private GeneralSubtree(
			Asn1Sequence seq)
		{
			baseName = GeneralName.GetInstance(seq[0]);

			switch (seq.Count)
			{
				case 1:
					break;
				case 2:
				{
					Asn1TaggedObject o = Asn1TaggedObject.GetInstance(seq[1]);
					switch (o.TagNo)
					{
						case 0:
							minimum = DerInteger.GetInstance(o, false);
							break;
						case 1:
							maximum = DerInteger.GetInstance(o, false);
							break;
						default:
							throw new ArgumentException("Bad tag number: " + o.TagNo);
					}
					break;
				}
				case 3:
				{
					minimum = DerInteger.GetInstance(Asn1TaggedObject.GetInstance(seq[1]));
					maximum = DerInteger.GetInstance(Asn1TaggedObject.GetInstance(seq[2]));
					break;
				}
				default:
					throw new ArgumentException("Bad sequence size: " + seq.Count);
			}
		}

        private TimeStampedDataParser(Asn1SequenceParser parser)
        {
            this.parser = parser;
            this.version = DerInteger.GetInstance(parser.ReadObject());

            Asn1Object obj = parser.ReadObject().ToAsn1Object();

            if (obj is DerIA5String)
            {
                this.dataUri = DerIA5String.GetInstance(obj);
                obj = parser.ReadObject().ToAsn1Object();
            }

            if (//obj is MetaData ||
                obj is Asn1SequenceParser)
            {
                this.metaData = MetaData.GetInstance(obj.ToAsn1Object());
                obj = parser.ReadObject().ToAsn1Object();
            }

            if (obj is Asn1OctetStringParser)
            {
                this.content = (Asn1OctetStringParser)obj;
            }
        }

 private PbmParameter(Asn1Sequence seq)
 {
     salt = Asn1OctetString.GetInstance(seq[0]);
     owf = AlgorithmIdentifier.GetInstance(seq[1]);
     iterationCount = DerInteger.GetInstance(seq[2]);
     mac = AlgorithmIdentifier.GetInstance(seq[3]);
 }

		public Accuracy(
			DerInteger seconds,
			DerInteger millis,
			DerInteger micros)
		{
			//Verifications
			if (millis != null
				&& (millis.Value.IntValue < MinMillis
					|| millis.Value.IntValue > MaxMillis))
			{
				throw new ArgumentException(
					"Invalid millis field : not in (1..999)");
			}

			if (micros != null
				&& (micros.Value.IntValue < MinMicros
					|| micros.Value.IntValue > MaxMicros))
			{
				throw new ArgumentException(
					"Invalid micros field : not in (1..999)");
			}

			this.seconds = seconds;
			this.millis = millis;
			this.micros = micros;
		}

		private AttributeCertificateInfo(
            Asn1Sequence seq)
        {
			if (seq.Count < 7 || seq.Count > 9)
			{
				throw new ArgumentException("Bad sequence size: " + seq.Count);
			}

			this.version = DerInteger.GetInstance(seq[0]);
            this.holder = Holder.GetInstance(seq[1]);
            this.issuer = AttCertIssuer.GetInstance(seq[2]);
            this.signature = AlgorithmIdentifier.GetInstance(seq[3]);
            this.serialNumber = DerInteger.GetInstance(seq[4]);
            this.attrCertValidityPeriod = AttCertValidityPeriod.GetInstance(seq[5]);
            this.attributes = Asn1Sequence.GetInstance(seq[6]);

			for (int i = 7; i < seq.Count; i++)
            {
                Asn1Encodable obj = (Asn1Encodable) seq[i];

				if (obj is DerBitString)
                {
                    this.issuerUniqueID = DerBitString.GetInstance(seq[i]);
                }
                else if (obj is Asn1Sequence || obj is X509Extensions)
                {
                    this.extensions = X509Extensions.GetInstance(seq[i]);
                }
            }
        }

        public AuthEnvelopedData(
            OriginatorInfo			originatorInfo,
            Asn1Set					recipientInfos,
            EncryptedContentInfo	authEncryptedContentInfo,
            Asn1Set					authAttrs,
            Asn1OctetString			mac,
            Asn1Set					unauthAttrs)
        {
            // "It MUST be set to 0."
            this.version = new DerInteger(0);

            this.originatorInfo = originatorInfo;

            // TODO
            // "There MUST be at least one element in the collection."
            this.recipientInfos = recipientInfos;

            this.authEncryptedContentInfo = authEncryptedContentInfo;

            // TODO
            // "The authAttrs MUST be present if the content type carried in
            // EncryptedContentInfo is not id-data."
            this.authAttrs = authAttrs;

            this.mac = mac;

            this.unauthAttrs = unauthAttrs;
        }

		public Pbkdf2Params(
			byte[] salt,
			int iterationCount)
		{
			this.octStr = new DerOctetString(salt);
			this.iterationCount = new DerInteger(iterationCount);
		}