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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 LTS provider but may also be used with other providers providing cryptographic services.

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package org.bouncycastle.bcpg.sig;

import org.bouncycastle.bcpg.SignatureSubpacket;
import org.bouncycastle.bcpg.SignatureSubpacketTags;
import org.bouncycastle.util.Arrays;
import org.bouncycastle.util.Strings;

/**
 * Signature Subpacket containing the URI of the users preferred key server.
 * This is a URI of a key server that the key holder prefers be used for updates.
 * Note that keys with multiple User IDs can have a preferred key server for each User ID.
 * Note also that since this is a URI, the key server can actually be a copy of the key
 * retrieved by ftp, http, finger, etc.
 *
 * @see 
 *     RFC4880 - Preferred Key Server
 * @see 
 *     RFC9580 - Preferred Key Server
 */
public class PreferredKeyServer
        extends SignatureSubpacket
{
    public PreferredKeyServer(boolean critical, boolean isLongLength, byte[] data)
    {
        super(SignatureSubpacketTags.PREFERRED_KEY_SERV, critical, isLongLength, data);
    }

    public PreferredKeyServer(boolean critical, String uri)
    {
        this(critical, false, Strings.toUTF8ByteArray(uri));
    }

    /**
     * Return the URI of the users preferred key server.
     * @return key server uri
     */
    public String getURI()
    {
        return Strings.fromUTF8ByteArray(data);
    }

    public byte[] getRawURI()
    {
        return Arrays.clone(data);
    }
}