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The Bouncy Castle Crypto package is a Java implementation of cryptographic algorithms. This jar contains JCE provider and lightweight API for the Bouncy Castle Cryptography APIs for JDK 1.5 and up.

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package org.bouncycastle.asn1.x9;

import java.math.BigInteger;

import org.bouncycastle.asn1.ASN1BitString;
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.DERBitString;
import org.bouncycastle.asn1.DERSequence;

/**
 * Diffie-Hellman domain validation parameters.
 *  * ValidationParams ::= SEQUENCE {
 *    seed         BIT STRING,
 *    pgenCounter  INTEGER
 * }
 * 
 */
public class ValidationParams
    extends ASN1Object
{
    private ASN1BitString seed;
    private ASN1Integer pgenCounter;

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

    public static ValidationParams getInstance(Object obj)
    {
        if (obj instanceof ValidationParams)
        {
            return (ValidationParams)obj;
        }
        else if (obj != null)
        {
            return new ValidationParams(ASN1Sequence.getInstance(obj));
        }

        return null;
    }

    public ValidationParams(byte[] seed, int pgenCounter)
    {
        if (seed == null)
        {
            throw new IllegalArgumentException("'seed' cannot be null");
        }

        this.seed = new DERBitString(seed);
        this.pgenCounter = new ASN1Integer(pgenCounter);
    }

    public ValidationParams(DERBitString seed, ASN1Integer pgenCounter)
    {
        if (seed == null)
        {
            throw new IllegalArgumentException("'seed' cannot be null");
        }
        if (pgenCounter == null)
        {
            throw new IllegalArgumentException("'pgenCounter' cannot be null");
        }

        this.seed = seed;
        this.pgenCounter = pgenCounter;
    }

    private ValidationParams(ASN1Sequence seq)
    {
        if (seq.size() != 2)
        {
            throw new IllegalArgumentException("Bad sequence size: " + seq.size());
        }

        this.seed = ASN1BitString.getInstance(seq.getObjectAt(0));
        this.pgenCounter = ASN1Integer.getInstance(seq.getObjectAt(1));
    }

    public byte[] getSeed()
    {
        return this.seed.getBytes();
    }

    public BigInteger getPgenCounter()
    {
        return this.pgenCounter.getPositiveValue();
    }

    public ASN1Primitive toASN1Primitive()
    {
        ASN1EncodableVector v = new ASN1EncodableVector(2);
        v.add(this.seed);
        v.add(this.pgenCounter);
        return new DERSequence(v);
    }
}