KeyIdUtil.java
// SPDX-FileCopyrightText: 2021 Paul Schaub <vanitasvitae@fsfe.org>
//
// SPDX-License-Identifier: Apache-2.0
package org.pgpainless.key.util;
import java.math.BigInteger;
import java.util.regex.Pattern;
public final class KeyIdUtil {
private KeyIdUtil() {
}
private static final Pattern LONG_KEY_ID = Pattern.compile("^[0-9A-Fa-f]{16}$");
/**
* Convert a long key-id into a key-id.
* A long key-id is a 16 digit hex string.
*
* @param longKeyId 16-digit hexadecimal string
* @return key-id converted to {@link Long}.
*/
public static long fromLongKeyId(String longKeyId) {
if (!LONG_KEY_ID.matcher(longKeyId).matches()) {
throw new IllegalArgumentException("Provided long key-id does not match expected format. " +
"A long key-id consists of 16 hexadecimal characters.");
}
return new BigInteger(longKeyId, 16).longValue();
}
}