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Java APIs to validate and request VOMS attribute certificates

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/**
 * Copyright (c) Istituto Nazionale di Fisica Nucleare, 2006-2014.
 *
 * 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.italiangrid.voms.util;

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.security.cert.CertificateEncodingException;
import java.security.cert.X509Certificate;

public class FingerprintHelper {

  public static final String DEFAULT_DIGEST_ALGORITHM = "SHA-1";

  private static String hexify(byte[] bytes) {

    char[] hexDigits = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a',
      'b', 'c', 'd', 'e', 'f' };

    StringBuffer buf = new StringBuffer(bytes.length * 2);

    for (int i = 0; i < bytes.length; ++i) {
      buf.append(hexDigits[(bytes[i] & 0xf0) >> 4]);
      buf.append(hexDigits[bytes[i] & 0x0f]);
    }

    return buf.toString();
  }

  public static String getFingerprint(X509Certificate cert)
    throws NoSuchAlgorithmException, CertificateEncodingException {

    MessageDigest md = MessageDigest.getInstance(DEFAULT_DIGEST_ALGORITHM);
    byte[] der = cert.getEncoded();

    md.update(der);
    byte[] digest = md.digest();

    return hexify(digest);
  }

}