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Java example source code file (BlacklistedCertsConverter.java)
The BlacklistedCertsConverter.java Java example source code/* * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ import java.security.MessageDigest; import java.security.NoSuchAlgorithmException; import java.security.cert.Certificate; import java.security.cert.CertificateEncodingException; import java.security.cert.CertificateFactory; import java.security.cert.X509Certificate; import java.util.Collection; /** * This is the tool to convert blacklisted.certs.pem to blacklisted.certs. * Every time a new blacklisted certs is added, please append the PEM format * to the end of blacklisted.certs.pem (with proper comments) and then use * this tool to generate an updated blacklisted.certs. Make sure to include * changes to both in a changeset. */ public class BlacklistedCertsConverter { public static void main(String[] args) throws Exception { if (args.length == 0) { System.out.println("Usage: java BlacklistedCertsConverter SHA-256" + " < blacklisted.certs.pem > blacklisted.certs"); System.exit(1); } String mdAlg = args[0]; CertificateFactory cf = CertificateFactory.getInstance("X.509"); Collection<? extends Certificate> certs = cf.generateCertificates(System.in); System.out.println("Algorithm=" + mdAlg); for (Certificate cert: certs) { System.out.println( getCertificateFingerPrint(mdAlg, (X509Certificate)cert)); } } /** * Converts a byte to hex digit and writes to the supplied buffer */ private static void byte2hex(byte b, StringBuffer buf) { char[] hexChars = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' }; int high = ((b & 0xf0) >> 4); int low = (b & 0x0f); buf.append(hexChars[high]); buf.append(hexChars[low]); } /** * Gets the requested finger print of the certificate. */ private static String getCertificateFingerPrint(String mdAlg, X509Certificate cert) { String fingerPrint = ""; try { byte[] encCertInfo = cert.getEncoded(); MessageDigest md = MessageDigest.getInstance(mdAlg); byte[] digest = md.digest(encCertInfo); StringBuffer buf = new StringBuffer(); for (int i = 0; i < digest.length; i++) { byte2hex(digest[i], buf); } fingerPrint = buf.toString(); } catch (NoSuchAlgorithmException | CertificateEncodingException e) { // ignored } return fingerPrint; } } Other Java examples (source code examples)Here is a short list of links related to this Java BlacklistedCertsConverter.java source code file: |
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