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The Bouncy Castle Java API for handling the OpenPGP protocol. This jar contains the OpenPGP API for JDK 1.5 to JDK 1.8. The APIs can be used in conjunction with a JCE/JCA provider such as the one provided with the Bouncy Castle Cryptography APIs.

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package org.bouncycastle.bcpg;

/**
 */
public class Packet
    implements PacketTags
{
    private final int packetTag;

    // for API compatibility
    public Packet()
    {
        this(RESERVED);
    }

    Packet(int packetTag)
    {
        this.packetTag = packetTag;
    }

    /**
     * Return the tag of the packet.
     *
     * @return packet tag
     */
    public final int getPacketTag()
    {
         return packetTag;
    }

    /**
     * Returns whether the packet is to be considered critical for v6 implementations.
     * Packets with tags less or equal to 39 are critical.
     * Tags 40 to 59 are reserved for unassigned, non-critical packets.
     * Tags 60 to 63 are non-critical private or experimental packets.
     *
     * @see 
     *     Packet Tags
     * @return true if the packet is critical, false otherwise.
     */
    public boolean isCritical()
    {
        return getPacketTag() <= 39;
    }
}