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    }