using System;

using Org.BouncyCastle.Asn1;
using Org.BouncyCastle.Math;
using Org.BouncyCastle.Utilities;

namespace Org.BouncyCastle.Asn1.Pkcs
{
    public class RC2CbcParameter
        : Asn1Encodable
    {
        internal DerInteger			version;
        internal Asn1OctetString	iv;

		public static RC2CbcParameter GetInstance(
            object obj)
        {
            if (obj is Asn1Sequence)
            {
                return new RC2CbcParameter((Asn1Sequence) obj);
            }

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

		public RC2CbcParameter(
            byte[] iv)
        {
            this.iv = new DerOctetString(iv);
        }

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

		private RC2CbcParameter(
            Asn1Sequence seq)
        {
            if (seq.Count == 1)
            {
                iv = (Asn1OctetString)seq[0];
            }
            else
            {
                version = (DerInteger)seq[0];
                iv = (Asn1OctetString)seq[1];
            }
        }

		public BigInteger RC2ParameterVersion
        {
            get
            {
				return version == null ? null : version.Value;
            }
        }

		public byte[] GetIV()
        {
			return Arrays.Clone(iv.GetOctets());
        }

		public override Asn1Object ToAsn1Object()
        {
            Asn1EncodableVector v = new Asn1EncodableVector();

			if (version != null)
            {
                v.Add(version);
            }

			v.Add(iv);

			return new DerSequence(v);
        }
    }
}
