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The Long Term Stable (LTS) Bouncy Castle Crypto package is a Java implementation of cryptographic algorithms. This jar contains the JCA/JCE provider and low-level API for the BC LTS version 2.73.7 for Java 8 and later.

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package org.bouncycastle.asn1.cryptopro;

import java.math.BigInteger;
import java.util.Enumeration;

import org.bouncycastle.asn1.ASN1EncodableVector;
import org.bouncycastle.asn1.ASN1Integer;
import org.bouncycastle.asn1.ASN1Object;
import org.bouncycastle.asn1.ASN1Primitive;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.ASN1TaggedObject;
import org.bouncycastle.asn1.DERSequence;

public class GOST3410ParamSetParameters
    extends ASN1Object
{
    int             keySize;
    ASN1Integer      p, q, a;

    public static GOST3410ParamSetParameters getInstance(
        ASN1TaggedObject obj,
        boolean          explicit)
    {
        return getInstance(ASN1Sequence.getInstance(obj, explicit));
    }

    public static GOST3410ParamSetParameters getInstance(
        Object obj)
    {
        if(obj == null || obj instanceof GOST3410ParamSetParameters)
        {
            return (GOST3410ParamSetParameters)obj;
        }

        if(obj instanceof ASN1Sequence)
        {
            return new GOST3410ParamSetParameters((ASN1Sequence)obj);
        }

        throw new IllegalArgumentException("Invalid GOST3410Parameter: " + obj.getClass().getName());
    }

    public GOST3410ParamSetParameters(
        int keySize,
        BigInteger  p,
        BigInteger  q,
        BigInteger  a)
    {
        this.keySize = keySize;
        this.p = new ASN1Integer(p);
        this.q = new ASN1Integer(q);
        this.a = new ASN1Integer(a);
    }

    public GOST3410ParamSetParameters(
        ASN1Sequence  seq)
    {
        Enumeration     e = seq.getObjects();

        keySize = ((ASN1Integer)e.nextElement()).intValueExact();
        p = (ASN1Integer)e.nextElement();
        q = (ASN1Integer)e.nextElement();
        a = (ASN1Integer)e.nextElement();
    }

    public int getKeySize()
    {
        return keySize;
    }
    
    public BigInteger getP()
    {
        return p.getPositiveValue();
    }

    public BigInteger getQ()
    {
        return q.getPositiveValue();
    }

    public BigInteger getA()
    {
        return a.getPositiveValue();
    }

    public ASN1Primitive toASN1Primitive()
    {
        ASN1EncodableVector v = new ASN1EncodableVector(4);

        v.add(new ASN1Integer(keySize));
        v.add(p);
        v.add(q);
        v.add(a);

        return new DERSequence(v);
    }
}