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Library for performing common cryptographic operations

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/*
  $Id: X509CertificatesCredentialReader.java 1818 2011-02-08 19:19:09Z dfisher $

  Copyright (C) 2007-2011 Virginia Tech.
  All rights reserved.

  SEE LICENSE FOR MORE INFORMATION

  Author:  Middleware Services
  Email:   [email protected]
  Version: $Revision: 1818 $
  Updated: $Date: 2011-02-08 14:19:09 -0500 (Tue, 08 Feb 2011) $
*/
package edu.vt.middleware.crypt.io;

import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.security.cert.CertificateException;
import java.security.cert.CertificateFactory;
import java.security.cert.X509Certificate;
import edu.vt.middleware.crypt.CryptException;
import edu.vt.middleware.crypt.CryptProvider;

/**
 * Reads collections of encoded X.509 certificates from a resource. Both PEM and
 * DER encodings are supported, as well as certificate chains in PKCS#7 format.
 *
 * @author  Middleware Services
 * @version  $Revision: 1818 $
 */
public class X509CertificatesCredentialReader
  implements CredentialReader
{

  /** Certificate type. */
  private static final String CERTIFICATE_TYPE = "X.509";


  /** {@inheritDoc} */
  public X509Certificate[] read(final File file)
    throws IOException, CryptException
  {
    return read(new BufferedInputStream(new FileInputStream(file)));
  }


  /** {@inheritDoc} */
  public X509Certificate[] read(final InputStream in)
    throws IOException, CryptException
  {
    try {
      final CertificateFactory cf = CryptProvider.getCertificateFactory(
        CERTIFICATE_TYPE);
      return cf.generateCertificates(in).toArray(new X509Certificate[0]);
    } catch (CertificateException e) {
      throw new CryptException("Failed reading X.509 certificate.", e);
    }
  }
}