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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.x509;

import java.math.BigInteger;

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;
import org.bouncycastle.asn1.DERTaggedObject;

/**
 * Class for containing a restriction object subtrees in NameConstraints. See
 * RFC 3280.
 * 
 *  *       
 *       GeneralSubtree ::= SEQUENCE 
 *       {
 *         base                    GeneralName,
 *         minimum         [0]     BaseDistance DEFAULT 0,
 *         maximum         [1]     BaseDistance OPTIONAL 
 *       }
 * 
 * 
 * @see org.bouncycastle.asn1.x509.NameConstraints
 * 
 */
public class GeneralSubtree 
    extends ASN1Object
{
    private static final BigInteger ZERO = BigInteger.valueOf(0);

    private GeneralName base;

    private ASN1Integer minimum;

    private ASN1Integer maximum;

    private GeneralSubtree(
        ASN1Sequence seq) 
    {
        base = GeneralName.getInstance(seq.getObjectAt(0));

        switch (seq.size()) 
        {
        case 1:
            break;
        case 2:
            ASN1TaggedObject o = ASN1TaggedObject.getInstance(seq.getObjectAt(1));
            switch (o.getTagNo()) 
            {
            case 0:
                minimum = ASN1Integer.getInstance(o, false);
                break;
            case 1:
                maximum = ASN1Integer.getInstance(o, false);
                break;
            default:
                throw new IllegalArgumentException("Bad tag number: "
                        + o.getTagNo());
            }
            break;
        case 3:
        {
            {
                ASN1TaggedObject oMin = ASN1TaggedObject.getInstance(seq.getObjectAt(1));
                if (oMin.getTagNo() != 0)
                {
                    throw new IllegalArgumentException("Bad tag number for 'minimum': " + oMin.getTagNo());
                }
                minimum = ASN1Integer.getInstance(oMin, false);
            }

            {
                ASN1TaggedObject oMax = ASN1TaggedObject.getInstance(seq.getObjectAt(2));
                if (oMax.getTagNo() != 1)
                {
                    throw new IllegalArgumentException("Bad tag number for 'maximum': " + oMax.getTagNo());
                }
                maximum = ASN1Integer.getInstance(oMax, false);
            }

            break;
        }
        default:
            throw new IllegalArgumentException("Bad sequence size: "
                    + seq.size());
        }
    }

    /**
     * Constructor from a given details.
     * 
     * According RFC 3280, the minimum and maximum fields are not used with any
     * name forms, thus minimum MUST be zero, and maximum MUST be absent.
     * 
     * If minimum is null, zero is assumed, if
     * maximum is null, maximum is absent.
     * 
     * @param base
     *            A restriction.
     * @param minimum
     *            Minimum
     * 
     * @param maximum
     *            Maximum
     */
    public GeneralSubtree(
        GeneralName base,
        BigInteger minimum,
        BigInteger maximum)
    {
        this.base = base;
        if (maximum != null)
        {
            this.maximum = new ASN1Integer(maximum);
        }
        if (minimum == null)
        {
            this.minimum = null;
        }
        else
        {
            this.minimum = new ASN1Integer(minimum);
        }
    }

    public GeneralSubtree(GeneralName base)
    {
        this(base, null, null);
    }

    public static GeneralSubtree getInstance(
        ASN1TaggedObject o,
        boolean explicit)
    {
        return new GeneralSubtree(ASN1Sequence.getInstance(o, explicit));
    }

    public static GeneralSubtree getInstance(
        Object obj)
    {
        if (obj == null)
        {
            return null;
        }

        if (obj instanceof GeneralSubtree)
        {
            return (GeneralSubtree) obj;
        }

        return new GeneralSubtree(ASN1Sequence.getInstance(obj));
    }

    public GeneralName getBase()
    {
        return base;
    }

    public BigInteger getMinimum()
    {
        if (minimum == null)
        {
            return ZERO;
        }

        return minimum.getValue();
    }

    public BigInteger getMaximum()
    {
        if (maximum == null)
        {
            return null;
        }

        return maximum.getValue();
    }

    /**
     * Produce an object suitable for an ASN1OutputStream.
     * 
     * Returns:
     * 
     * 
     *       GeneralSubtree ::= SEQUENCE 
     *       {
     *         base                    GeneralName,
     *         minimum         [0]     BaseDistance DEFAULT 0,
     *         maximum         [1]     BaseDistance OPTIONAL 
     *       }
     * 
     * 
     * @return a ASN1Primitive
     */
    public ASN1Primitive toASN1Primitive()
    {
        ASN1EncodableVector v = new ASN1EncodableVector(3);

        v.add(base);

        if (minimum != null && !minimum.hasValue(0))
        {
            v.add(new DERTaggedObject(false, 0, minimum));
        }

        if (maximum != null)
        {
            v.add(new DERTaggedObject(false, 1, maximum));
        }

        return new DERSequence(v);
    }
}