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The Bouncy Castle Java APIs for the OpenPGP Protocol. 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.bcpg.sig;

import org.bouncycastle.bcpg.SignatureSubpacket;
import org.bouncycastle.bcpg.SignatureSubpacketTags;

public class Features
    extends SignatureSubpacket
{
    /**
     * Identifier for the Modification Detection (packets 18 and 19)
     */
    public static final byte FEATURE_MODIFICATION_DETECTION = 0x01;
    /**
     * Identifier for the AEAD Encrypted Data Packet (packet 20) and version 5
     * Symmetric-Key Encrypted Session Key Packets (packet 3)
     */
    public static final byte FEATURE_AEAD_ENCRYPTED_DATA = 0x02;
    /**
     * Identifier for the Version 5 Public-Key Packet format and corresponding new
     * fingerprint format
     */
    public static final byte FEATURE_VERSION_5_PUBLIC_KEY = 0x04;

    private static final byte[] featureToByteArray(byte feature)
    {
        byte[] data = new byte[1];
        data[0] = feature;
        return data;
    }

    public Features(
        boolean critical,
        boolean isLongLength,
        byte[] data)
    {
        super(SignatureSubpacketTags.FEATURES, critical, isLongLength, data);
    }

    public Features(boolean critical, byte features)
    {
        super(SignatureSubpacketTags.FEATURES, critical, false, featureToByteArray(features));
    }

    public Features(boolean critical, int features)
    {
        super(SignatureSubpacketTags.FEATURES, critical, false, featureToByteArray((byte)features));
    }

    public byte getFeatures()
    {
        return data[0];
    }

    /**
     * Returns if modification detection is supported.
     */
    public boolean supportsModificationDetection()
    {
        return supportsFeature(FEATURE_MODIFICATION_DETECTION);
    }

    /**
     * Returns if a particular feature is supported.
     */
    public boolean supportsFeature(byte feature)
    {
        return (data[0] & feature) != 0;
    }
}