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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 feature */
    public static final byte FEATURE_MODIFICATION_DETECTION = 1;

    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 feature)
    {
        super(SignatureSubpacketTags.FEATURES, critical, false, featureToByteArray(feature));
    }

    /**
     * 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)
    {
        for (int i = 0; i < data.length; i++)
        {
            if (data[i] == feature)
            {
                return true;
            }
        }
        return false;
    }


    /**
     * Sets support for a particular feature.
     */
    private void setSupportsFeature(byte feature, boolean support)
    {
        if (feature == 0)
        {
            throw new IllegalArgumentException("feature == 0");
        }
        if (supportsFeature(feature) != support)
        {
            if (support == true)
            {
                byte[] temp = new byte[data.length + 1];
                System.arraycopy(data, 0, temp, 0, data.length);
                temp[data.length] = feature;
                data = temp;
            }
            else
            {
                for (int i = 0; i < data.length; i++)
                {
                    if (data[i] == feature)
                    {
                        byte[] temp = new byte[data.length - 1];
                        System.arraycopy(data, 0, temp, 0, i);
                        System.arraycopy(data, i + 1, temp, i, temp.length - i);
                        data = temp;
                        break;
                    }
                }
            }
        }
    }
}