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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 1.6.

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package org.bouncycastle.asn1.cmp;

import java.util.Enumeration;

import org.bouncycastle.asn1.ASN1Encodable;
import org.bouncycastle.asn1.ASN1EncodableVector;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.ASN1TaggedObject;
import org.bouncycastle.asn1.DERObject;
import org.bouncycastle.asn1.DERSequence;
import org.bouncycastle.asn1.DERUTF8String;

public class PKIFreeText
    extends ASN1Encodable
{
    ASN1Sequence strings;

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

    public static PKIFreeText getInstance(
        Object obj)
    {
        if (obj instanceof PKIFreeText)
        {
            return (PKIFreeText)obj;
        }
        else if (obj instanceof ASN1Sequence)
        {
            return new PKIFreeText((ASN1Sequence)obj);
        }

        throw new IllegalArgumentException("Unknown object in factory: " + obj.getClass().getName());
    }

    public PKIFreeText(
        ASN1Sequence seq)
    {
        Enumeration e = seq.getObjects();
        while (e.hasMoreElements())
        {
            if (!(e.nextElement() instanceof DERUTF8String))
            {
                throw new IllegalArgumentException("attempt to insert non UTF8 STRING into PKIFreeText");
            }
        }
        
        strings = seq;
    }

    public PKIFreeText(
        DERUTF8String p)
    {
        strings = new DERSequence(p);
    }

    public PKIFreeText(
        DERUTF8String[] strs)
    {
        ASN1EncodableVector v = new ASN1EncodableVector();
        for (int i = 0; i < strs.length; i++) {
            v.add(strs[i]);
        }
        strings = new DERSequence(v);
    }

    public PKIFreeText(
        String[] strs)
    {
        ASN1EncodableVector v = new ASN1EncodableVector();
        for (int i = 0; i < strs.length; i++) {
            v.add(new DERUTF8String(strs[i]));
        }
        strings = new DERSequence(v);
    }

    /**
     * Return the number of string elements present.
     * 
     * @return number of elements present.
     */
    public int size()
    {
        return strings.size();
    }
    
    /**
     * Return the UTF8STRING at index i.
     * 
     * @param i index of the string of interest
     * @return the string at index i.
     */
    public DERUTF8String getStringAt(
        int i)
    {
        return (DERUTF8String)strings.getObjectAt(i);
    }
    
    /**
     *      * PKIFreeText ::= SEQUENCE SIZE (1..MAX) OF UTF8String
     * 
     */
    public DERObject toASN1Object()
    {
        return strings;
    }
}