    001    /* Copyright  (c) 2002 Graz University of Technology. All rights reserved.
    002     *
    003     * Redistribution and use in  source and binary forms, with or without
    004     * modification, are permitted  provided that the following conditions are met:
    005     *
    006     * 1. Redistributions of  source code must retain the above copyright notice,
    007     *    this list of conditions and the following disclaimer.
    008     *
    009     * 2. Redistributions in  binary form must reproduce the above copyright notice,
    010     *    this list of conditions and the following disclaimer in the documentation
    011     *    and/or other materials provided with the distribution.
    012     *
    013     * 3. The end-user documentation included with the redistribution, if any, must
    014     *    include the following acknowledgment:
    015     *
    016     *    "This product includes software developed by IAIK of Graz University of
    017     *     Technology."
    018     *
    019     *    Alternately, this acknowledgment may appear in the software itself, if
    020     *    and wherever such third-party acknowledgments normally appear.
    021     *
    022     * 4. The names "Graz University of Technology" and "IAIK of Graz University of
    023     *    Technology" must not be used to endorse or promote products derived from
    024     *    this software without prior written permission.
    025     *
    026     * 5. Products derived from this software may not be called
    027     *    "IAIK PKCS Wrapper", nor may "IAIK" appear in their name, without prior
    028     *    written permission of Graz University of Technology.
    029     *
    030     *  THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESSED OR IMPLIED
    031     *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
    032     *  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
    033     *  PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE LICENSOR BE
    034     *  LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
    035     *  OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
    036     *  PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
    037     *  OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
    038     *  ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
    039     *  OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
    040     *  OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
    041     *  POSSIBILITY  OF SUCH DAMAGE.
    042     */
    043
    044    package demo.pkcs.pkcs11;
    045
    046    import java.io.FileInputStream;
    047    import java.io.IOException;
    048    import java.io.InputStream;
    049    import java.math.BigInteger;
    050    import java.security.GeneralSecurityException;
    051    import java.security.Security;
    052    import java.security.Signature;
    053    import java.security.cert.CertificateFactory;
    054    import java.security.cert.X509Certificate;
    055
    056    import javax.crypto.Cipher;
    057
    058    import iaik.security.provider.IAIK;
    059    import iaik.utils.Util;
    060
    061
    062
    063    public class VerifySignature {
    064
    065      protected X509Certificate certificate_;
    066
    067      protected Signature verifyEngine_;
    068
    069      public VerifySignature(X509Certificate certificate, String algorithm)
    070          throws GeneralSecurityException
    071      {
    072        certificate_ = certificate;
    073        // verifyEngine_ = Signature.getInstance(algorithm, "IAIK");
    074        verifyEngine_ = Signature.getInstance(algorithm);
    075        verifyEngine_.initVerify(certificate.getPublicKey());
    076      }
    077
    078      public boolean verify(InputStream data, byte[] signature)
    079          throws IOException, GeneralSecurityException
    080      {
    081        byte[] buffer = new byte[1024];
    082        int bytesRead;
    083
    084        while ((bytesRead = data.read(buffer, 0, buffer.length)) >= 0) {
    085          verifyEngine_.update(buffer, 0, bytesRead);
    086        }
    087
    088        return verifyEngine_.verify(signature) ;
    089      }
    090
    091      public static void main(String[] args) {
    092        if (args.length != 4) {
    093          printUsage();
    094          System.exit(1);
    095        }
    096
    097        try {
    098          FileInputStream dataInput = new FileInputStream(args[0]);
    099          byte[] signature = Util.readStream(new FileInputStream(args[1]));
    100          FileInputStream certificateInput = new FileInputStream(args[2]);
    101          Security.addProvider(new IAIK());
    102          //CertificateFactory certificateFactory = CertificateFactory.getInstance("X.509", "IAIK");
    103          CertificateFactory certificateFactory = CertificateFactory.getInstance("X.509");
    104          X509Certificate certificate = (X509Certificate) certificateFactory.generateCertificate(certificateInput);
    105
    106          VerifySignature verifier = new VerifySignature(certificate, args[3]);
    107
    108          if (verifier.verify(dataInput, signature)) {
    109            System.out.println("Verified signature successfully.");
    110          } else {
    111            System.out.println("Signature is INVALID.");
    112            Cipher rsa = Cipher.getInstance("RSA/ECB/NoPadding");
    113            rsa.init(Cipher.DECRYPT_MODE, certificate.getPublicKey());
    114            byte[] signedBlock = rsa.doFinal(signature);
    115            System.out.println("Decrypted signature value is (hex):");
    116            System.out.println(new BigInteger(1, signedBlock).toString(16));
    117          }
    118
    119        } catch (Throwable thr) {
    120          thr.printStackTrace();
    121        }
    122      }
    123
    124      public static void printUsage() {
    125        System.out.println("Usage: VerifySignature <data file> <signature file> <X.509 certificate file> <algorithm>");
    126        System.out.println(" e.g.: VerifySignature data.dat signature.bin signerCertificate.der SHA1withRSA");
    127      }
    128
    129
    130    }