/**
*
* Copyright 2005 The Apache Software Foundation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.geronimo.util;
import org.apache.geronimo.util.encoders.HexEncoder;
import java.security.cert.Certificate;
import java.security.cert.CertificateEncodingException;
import java.security.NoSuchAlgorithmException;
import java.security.MessageDigest;
import java.io.IOException;
import java.io.ByteArrayOutputStream;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
* Various utility functions for dealing with X.509 certificates
*
* @version $Rev: 409817 $ $Date: 2006-05-27 03:56:38 -0400 (Sat, 27 May 2006) $
*/
public class CertificateUtil {
public static String generateFingerprint(Certificate cert, String digestAlgorithm) throws NoSuchAlgorithmException, CertificateEncodingException, IOException {
MessageDigest md = MessageDigest.getInstance(digestAlgorithm);
byte[] digest = md.digest(cert.getEncoded());
ByteArrayOutputStream out = new ByteArrayOutputStream(digest.length*2);
new HexEncoder().encode(digest, 0, digest.length, out);
String all = new String(out.toByteArray(), "US-ASCII").toUpperCase();
Matcher matcher = Pattern.compile("..").matcher(all);
StringBuffer buf = new StringBuffer();
while(matcher.find()) {
if(buf.length() > 0) {
buf.append(":");
}
buf.append(matcher.group());
}
return buf.toString();
}
}