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The Bouncy Castle Java APIs for CMS, PKCS, EAC, TSP, CMP, CRMF, OCSP, and certificate generation. This jar contains APIs for JDK 1.5 and up. The APIs can be used in conjunction with a JCE/JCA provider such as the one provided with the Bouncy Castle Cryptography APIs.

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package org.bouncycastle.asn1.pkcs;

import java.math.BigInteger;

import org.bouncycastle.asn1.ASN1EncodableVector;
import org.bouncycastle.asn1.ASN1Integer;
import org.bouncycastle.asn1.ASN1Object;
import org.bouncycastle.asn1.ASN1OctetString;
import org.bouncycastle.asn1.ASN1Primitive;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.DEROctetString;
import org.bouncycastle.asn1.DERSequence;

public class PBEParameter
    extends ASN1Object
{
    ASN1Integer      iterations;
    ASN1OctetString salt;

    public PBEParameter(
        byte[]      salt,
        int         iterations)
    {
        if (salt.length != 8)
        {
            throw new IllegalArgumentException("salt length must be 8");
        }
        this.salt = new DEROctetString(salt);
        this.iterations = new ASN1Integer(iterations);
    }

    private PBEParameter(
        ASN1Sequence  seq)
    {
        salt = (ASN1OctetString)seq.getObjectAt(0);
        iterations = (ASN1Integer)seq.getObjectAt(1);
    }

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

        return null;
    }

    public BigInteger getIterationCount()
    {
        return iterations.getValue();
    }

    public byte[] getSalt()
    {
        return salt.getOctets();
    }

    public ASN1Primitive toASN1Primitive()
    {
        ASN1EncodableVector v = new ASN1EncodableVector(2);

        v.add(salt);
        v.add(iterations);

        return new DERSequence(v);
    }
}