116 lines
3.3 KiB
Java
116 lines
3.3 KiB
Java
/**
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*
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* Copyright 2018 Paul Schaub.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.jivesoftware.smackx.ox;
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import java.nio.charset.Charset;
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import org.jivesoftware.smack.util.Objects;
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import org.jivesoftware.smackx.ox.util.Util;
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/**
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* This class represents an hex encoded, uppercase OpenPGP v4 fingerprint.
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*/
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public class OpenPgpV4Fingerprint implements CharSequence, Comparable<OpenPgpV4Fingerprint> {
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private final String fingerprint;
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/**
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* Create an {@link OpenPgpV4Fingerprint}.
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* @see <a href="https://xmpp.org/extensions/xep-0373.html#annoucning-pubkey">
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* XEP-0373 §4.1: The OpenPGP Public-Key Data Node about how to obtain the fingerprint</a>
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* @param fingerprint hexadecimal representation of the fingerprint.
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*/
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public OpenPgpV4Fingerprint(String fingerprint) {
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String fp = Objects.requireNonNull(fingerprint)
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.trim()
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.toUpperCase();
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if (!isValid(fp)) {
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throw new IllegalArgumentException("Fingerprint " + fingerprint +
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" does not appear to be a valid OpenPGP v4 fingerprint.");
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}
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this.fingerprint = fp;
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}
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public OpenPgpV4Fingerprint(byte[] bytes) {
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this(new String(bytes, Charset.forName("UTF-8")));
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}
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/**
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* Check, whether the fingerprint consists of 40 valid hexadecimal characters.
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* @param fp fingerprint to check.
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* @return true if fingerprint is valid.
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*/
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private boolean isValid(String fp) {
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return fp.matches("[0-9A-F]{40}");
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}
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/**
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* Return the key id of the OpenPGP public key this {@link OpenPgpV4Fingerprint} belongs to.
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* This method uses {@link Util#keyIdFromFingerprint(OpenPgpV4Fingerprint)}.
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*
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* @see <a href="https://tools.ietf.org/html/rfc4880#section-12.2">
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* RFC-4880 §12.2: Key IDs and Fingerprints</a>
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* @return key id
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*/
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public long getKeyId() {
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return Util.keyIdFromFingerprint(this);
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}
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@Override
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public boolean equals(Object other) {
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if (other == null) {
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return false;
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}
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if (!(other instanceof CharSequence)) {
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return false;
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}
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return this.toString().equals(other.toString());
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}
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@Override
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public int hashCode() {
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return fingerprint.hashCode();
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}
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@Override
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public int length() {
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return fingerprint.length();
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}
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@Override
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public char charAt(int i) {
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return fingerprint.charAt(i);
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}
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@Override
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public CharSequence subSequence(int i, int i1) {
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return fingerprint.subSequence(i, i1);
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}
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@Override
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public String toString() {
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return fingerprint;
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}
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@Override
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public int compareTo(OpenPgpV4Fingerprint openPgpV4Fingerprint) {
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return fingerprint.compareTo(openPgpV4Fingerprint.fingerprint);
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}
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}
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