76 lines
2.1 KiB
Java
76 lines
2.1 KiB
Java
/*
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* Minecraft Forge
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* Copyright (c) 2016.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation version 2.1
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* of the License.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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package net.minecraftforge.fml.common;
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import java.nio.ByteBuffer;
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import java.security.MessageDigest;
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import java.security.cert.Certificate;
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public class CertificateHelper {
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private static final String HEXES = "0123456789abcdef";
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public static String getFingerprint(Certificate certificate)
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{
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if (certificate == null)
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{
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return "NO VALID CERTIFICATE FOUND";
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}
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try
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{
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MessageDigest md = MessageDigest.getInstance("SHA-1");
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byte[] der = certificate.getEncoded();
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md.update(der);
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byte[] digest = md.digest();
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return hexify(digest);
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}
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catch (Exception e)
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{
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return null;
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}
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}
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public static String getFingerprint(ByteBuffer buffer)
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{
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try
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{
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MessageDigest digest = MessageDigest.getInstance("SHA-1");
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digest.update(buffer);
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byte[] chksum = digest.digest();
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return hexify(chksum);
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}
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catch (Exception e)
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{
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return null;
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}
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}
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private static String hexify(byte[] chksum)
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{
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final StringBuilder hex = new StringBuilder( 2 * chksum.length );
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for ( final byte b : chksum ) {
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hex.append(HEXES.charAt((b & 0xF0) >> 4))
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.append(HEXES.charAt((b & 0x0F)));
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}
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return hex.toString();
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}
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}
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