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68 lines
1.7 KiB
Java
68 lines
1.7 KiB
Java
/*
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* Forge Mod Loader
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* Copyright (c) 2012-2013 cpw.
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* All rights reserved. This program and the accompanying materials
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* are made available under the terms of the GNU Lesser Public License v2.1
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* which accompanies this distribution, and is available at
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* http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
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*
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* Contributors:
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* cpw - implementation
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*/
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package cpw.mods.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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} |