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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.IOException;
import java.io.InputStream;
import java.io.OutputStream;

import org.bouncycastle.util.Arrays;
import org.bouncycastle.util.Strings;

/**
 * RFC 7301 Represents a protocol name for use with ALPN.
 */
public final class ProtocolName
{
    public static final ProtocolName asRawBytes(byte[] bytes)
    {
        return new ProtocolName(Arrays.clone(bytes));
    }

    public static final ProtocolName asUtf8Encoding(String name)
    {
        return new ProtocolName(Strings.toUTF8ByteArray(name));
    }

    public static final ProtocolName HTTP_1_1 = asUtf8Encoding("http/1.1");
    public static final ProtocolName SPDY_1 = asUtf8Encoding("spdy/1");
    public static final ProtocolName SPDY_2 = asUtf8Encoding("spdy/2");
    public static final ProtocolName SPDY_3 = asUtf8Encoding("spdy/3");
    public static final ProtocolName STUN_TURN = asUtf8Encoding("stun.turn");
    public static final ProtocolName STUN_NAT_DISCOVERY = asUtf8Encoding("stun.nat-discovery");
    public static final ProtocolName HTTP_2_TLS = asUtf8Encoding("h2");
    public static final ProtocolName HTTP_2_TCP = asUtf8Encoding("h2c");
    public static final ProtocolName WEBRTC = asUtf8Encoding("webrtc");
    public static final ProtocolName WEBRTC_CONFIDENTIAL = asUtf8Encoding("c-webrtc");
    public static final ProtocolName FTP = asUtf8Encoding("ftp");
    public static final ProtocolName IMAP = asUtf8Encoding("imap");
    public static final ProtocolName POP3 = asUtf8Encoding("pop3");
    public static final ProtocolName MANAGESIEVE = asUtf8Encoding("managesieve");
    public static final ProtocolName COAP = asUtf8Encoding("coap");
    public static final ProtocolName XMPP_CLIENT = asUtf8Encoding("xmpp-client");
    public static final ProtocolName XMPP_SERVER = asUtf8Encoding("xmpp-server");

    private final byte[] bytes;

    private ProtocolName(byte[] bytes)
    {
        if (bytes == null)
        {
            throw new IllegalArgumentException("'bytes' cannot be null");
        }
        if (bytes.length < 1 || bytes.length > 255)
        {
            throw new IllegalArgumentException("'bytes' must have length from 1 to 255");
        }

        this.bytes = bytes;
    }

    public byte[] getBytes()
    {
        return Arrays.clone(bytes);
    }

    public String getUtf8Decoding()
    {
        return Strings.fromUTF8ByteArray(bytes);
    }

    /**
     * Encode this {@link ProtocolName} to an {@link OutputStream}.
     * 
     * @param output
     *            the {@link OutputStream} to encode to.
     * @throws IOException
     */
    public void encode(OutputStream output) throws IOException
    {
        TlsUtils.writeOpaque8(bytes, output);
    }

    /**
     * Parse a {@link ProtocolName} from an {@link InputStream}.
     * 
     * @param input
     *            the {@link InputStream} to parse from.
     * @return a {@link ProtocolName} object.
     * @throws IOException
     */
    public static ProtocolName parse(InputStream input) throws IOException
    {
        return new ProtocolName(TlsUtils.readOpaque8(input, 1));
    }

    public boolean equals(Object obj)
    {
        return obj instanceof ProtocolName && Arrays.areEqual(bytes, ((ProtocolName)obj).bytes);
    }

    public int hashCode()
    {
        return Arrays.hashCode(bytes);
    }
}