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The Bouncy Castle Java APIs for the TLS, including a JSSE provider. The APIs are designed primarily to be used in conjunction 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.tls;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Vector;

import org.bouncycastle.util.Arrays;
import org.bouncycastle.util.io.Streams;

public class ServerNameList
{
    protected Vector serverNameList;

    /**
     * @param serverNameList a {@link Vector} of {@link ServerName}.
     */
    public ServerNameList(Vector serverNameList)
    {
        if (serverNameList == null)
        {
            throw new IllegalArgumentException("'serverNameList' must not be null");
        }

        this.serverNameList = serverNameList;
    }

    /**
     * @return a {@link Vector} of {@link ServerName}.
     */
    public Vector getServerNameList()
    {
        return serverNameList;
    }

    /**
     * Encode this {@link ServerNameList} to an {@link OutputStream}.
     * 
     * @param output
     *            the {@link OutputStream} to encode to.
     * @throws IOException
     */
    public void encode(OutputStream output) throws IOException
    {
        ByteArrayOutputStream buf = new ByteArrayOutputStream();

        short[] nameTypesSeen = new short[0];
        for (int i = 0; i < serverNameList.size(); ++i)
        {
            ServerName entry = (ServerName)serverNameList.elementAt(i);

            nameTypesSeen = checkNameType(nameTypesSeen, entry.getNameType());
            if (nameTypesSeen == null)
            {
                throw new TlsFatalAlert(AlertDescription.internal_error);
            }

            entry.encode(buf);
        }

        TlsUtils.checkUint16(buf.size());
        TlsUtils.writeUint16(buf.size(), output);
        Utils.writeBufTo(buf, output);
    }

    /**
     * Parse a {@link ServerNameList} from an {@link InputStream}.
     * 
     * @param input
     *            the {@link InputStream} to parse from.
     * @return a {@link ServerNameList} object.
     * @throws IOException
     */
    public static ServerNameList parse(InputStream input) throws IOException
    {
        int length = TlsUtils.readUint16(input);
        if (length < 1)
        {
            throw new TlsFatalAlert(AlertDescription.decode_error);
        }

        byte[] data = TlsUtils.readFully(length, input);

        ByteArrayInputStream buf = new ByteArrayInputStream(data);

        short[] nameTypesSeen = new short[0];
        Vector server_name_list = new Vector();
        while (buf.available() > 0)
        {
            ServerName entry = ServerName.parse(buf);

            nameTypesSeen = checkNameType(nameTypesSeen, entry.getNameType());
            if (nameTypesSeen == null)
            {
                throw new TlsFatalAlert(AlertDescription.illegal_parameter);
            }

            server_name_list.addElement(entry);
        }

        return new ServerNameList(server_name_list);
    }

    private static short[] checkNameType(short[] nameTypesSeen, short nameType)
    {
        /*
         * RFC 6066 3. The ServerNameList MUST NOT contain more than one name of the same
         * name_type.
         */
        if (!NameType.isValid(nameType) || Arrays.contains(nameTypesSeen, nameType))
        {
            return null;
        }
        return Arrays.append(nameTypesSeen, nameType);
    }
}