content: /*
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements.  See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership.  The ASF licenses this file
   * to you 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.ambari.server.security.encryption;
  
  import java.io.ByteArrayInputStream;
  import java.io.UnsupportedEncodingException;
  import java.security.cert.CertificateException;
  import java.security.cert.CertificateFactory;
  import java.security.cert.X509Certificate;
  import java.security.interfaces.RSAPublicKey;
  
  /**
   * Utility class containing methods to works with certificates
   */
  public class CertificateUtils {
  
    /**
     * Get RSA public key from X.509 certificate string (full crt file content, including header and footer)
     * @param certificateString certificate string
     * @return RSA public key
     * @throws CertificateException
     * @throws UnsupportedEncodingException
     */
    public static RSAPublicKey getPublicKeyFromString(String certificateString)
      throws CertificateException, UnsupportedEncodingException {
  
      CertificateFactory fact = CertificateFactory.getInstance("X.509");
      ByteArrayInputStream is = new ByteArrayInputStream(
        certificateString.getBytes("UTF8"));
  
      X509Certificate cer = (X509Certificate) fact.generateCertificate(is);
      return (RSAPublicKey)cer.getPublicKey();
    }
  }
  