45 lines
1.4 KiB
Java
45 lines
1.4 KiB
Java
/*
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* Copyright 2021 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.pgpainless.key.util;
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import java.math.BigInteger;
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import java.util.regex.Pattern;
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public final class KeyIdUtil {
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private KeyIdUtil() {
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}
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private static final Pattern LONG_KEY_ID = Pattern.compile("^[0-9A-Fa-f]{16}$");
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/**
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* Convert a long key-id into a key-id.
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* A long key-id is a 16 digit hex string.
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*
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* @param longKeyId 16-digit hexadecimal string
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* @return key-id converted to {@link Long}.
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*/
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public static long fromLongKeyId(String longKeyId) {
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if (!LONG_KEY_ID.matcher(longKeyId).matches()) {
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throw new IllegalArgumentException("Provided long key-id does not match expected format. " +
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"A long key-id consists of 16 hexadecimal characters.");
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}
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return new BigInteger(longKeyId, 16).longValue();
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}
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}
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