GOST3410ParamSetParameters.cs :  » PDF » iTextSharp » Org » BouncyCastle » Asn1 » CryptoPro » C# / CSharp Open Source

using System;
using System.Collections;

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

namespace Org.BouncyCastle.Asn1.CryptoPro{
    public class Gost3410ParamSetParameters
        : Asn1Encodable
    {
        private readonly int keySize;
        private readonly DerInteger  p, q, a;

    public static Gost3410ParamSetParameters GetInstance(
            Asn1TaggedObject  obj,
            bool        explicitly)
        {
            return GetInstance(Asn1Sequence.GetInstance(obj, explicitly));
        }

    public static Gost3410ParamSetParameters GetInstance(
            object obj)
        {
            if (obj == null || obj is Gost3410ParamSetParameters)
            {
                return (Gost3410ParamSetParameters) obj;
            }

      if (obj is Asn1Sequence)
            {
                return new Gost3410ParamSetParameters((Asn1Sequence) obj);
            }

      throw new ArgumentException("Invalid GOST3410Parameter: " + obj.GetType().Name);
        }

    public Gost3410ParamSetParameters(
            int      keySize,
            BigInteger  p,
            BigInteger  q,
            BigInteger  a)
        {
            this.keySize = keySize;
            this.p = new DerInteger(p);
            this.q = new DerInteger(q);
            this.a = new DerInteger(a);
        }

    private Gost3410ParamSetParameters(
            Asn1Sequence seq)
        {
      if (seq.Count != 4)
        throw new ArgumentException("Wrong number of elements in sequence", "seq");

      this.keySize = DerInteger.GetInstance(seq[0]).Value.IntValue;
      this.p = DerInteger.GetInstance(seq[1]);
            this.q = DerInteger.GetInstance(seq[2]);
      this.a = DerInteger.GetInstance(seq[3]);
        }

    public int KeySize
    {
      get { return keySize; }
    }

    public BigInteger P
    {
      get { return p.PositiveValue; }
    }

    public BigInteger Q
    {
      get { return q.PositiveValue; }
    }

    public BigInteger A
    {
      get { return a.PositiveValue; }
    }

    public override Asn1Object ToAsn1Object()
        {
      return new DerSequence(new DerInteger(keySize), p, q, a);
        }
    }
}