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The Bouncy Castle Java APIs for ASN.1 extension and utility APIs used to support bcpkix and bctls with the BC FIPS provider. The APIs may also be used with other providers although if being used in a FIPS context it is the responsibility of the user to ensure that any other providers used are FIPS certified and used appropriately.

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package org.bouncycastle.oer.its;

import java.lang.reflect.Method;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

import org.bouncycastle.asn1.ASN1Encodable;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.DERSequence;
import org.bouncycastle.util.Arrays;

public class ItsUtils
{

    /**
     *      *     OCTET STRING (SIZE(n))
     * 
     */
    public static byte[] octetStringFixed(byte[] octets, int n)
    {
        if (octets.length != n)
        {
            throw new IllegalArgumentException("octet string out of range");
        }

        return octets;
    }

    /**
     *      *     OCTET STRING (SIZE(1..32))
     * 
     */
    public static byte[] octetStringFixed(byte[] octets)
    {
        if (octets.length < 1 || octets.length > 32)
        {
            throw new IllegalArgumentException("octet string out of range");
        }

        return Arrays.clone(octets);
    }

    public static ASN1Sequence toSequence(List objs)
    {
        return new DERSequence((ASN1Encodable[])objs.toArray(new ASN1Encodable[0]));
    }

    public static ASN1Sequence toSequence(ASN1Encodable... objs)
    {
        return new DERSequence(objs);
    }

    @Deprecated
    public static  List fillList(final Class type, final ASN1Sequence sequence)
    {
        return AccessController.doPrivileged(new PrivilegedAction>()
        {
            public List run()
            {
                try
                {
                    List accumulator = new ArrayList();
                    for (Iterator it = sequence.iterator(); it.hasNext(); )
                    {
                        Method m = type.getMethod("getInstance", Object.class);
                        accumulator.add(type.cast(m.invoke(null, it.next())));
                    }
                    return accumulator;
                }
                catch (Exception ex)
                {
                    throw new IllegalStateException("could not invoke getInstance on type " + ex.getMessage(), ex);
                }
            }
        });
    }
}