41 lines
1.4 KiB
Java
41 lines
1.4 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.ByteBuffer;
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import java.util.Arrays;
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import javax.xml.bind.DatatypeConverter;
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public class Util {
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/**
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* Calculate the key id of the OpenPGP key, the given {@link OpenPgpV4Fingerprint} belongs to.
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*
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* @see <a href="https://tools.ietf.org/html/rfc4880#section-12.2"> RFC-4880 §12.2</a>
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* @param fingerprint {@link OpenPgpV4Fingerprint}.
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* @return key id
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*/
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public static long keyIdFromFingerprint(OpenPgpV4Fingerprint fingerprint) {
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byte[] bytes = DatatypeConverter.parseHexBinary(fingerprint.toString());
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byte[] lower8Bytes = Arrays.copyOfRange(bytes, 12, 20);
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ByteBuffer byteBuffer = ByteBuffer.allocate(8);
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byteBuffer.put(lower8Bytes);
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byteBuffer.flip();
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return byteBuffer.getLong();
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}
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}
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