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/*
* Copyright (c) 2011, 2012, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/**
* @see SignUsingSHA2withRSA.sh
*/
import java.security.*;
import java.util.*;
public class SignUsingSHA2withRSA {
private static final byte[] toBeSigned = new byte[] {
0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x10
};
private static List<byte[]> generatedSignatures = new ArrayList<>();
public static void main(String[] args) throws Exception {
Provider[] providers = Security.getProviders("Signature.SHA256withRSA");
if (providers == null) {
System.out.println("No JCE providers support the " +
"'Signature.SHA256withRSA' algorithm");
System.out.println("Skipping this test...");
return;
} else {
System.out.println("The following JCE providers support the " +
"'Signature.SHA256withRSA' algorithm: ");
for (Provider provider : providers) {
System.out.println(" " + provider.getName());
}
}
System.out.println("-------------------------------------------------");
KeyStore ks = KeyStore.getInstance("Windows-MY", "SunMSCAPI");
ks.load(null, null);
System.out.println("Loaded keystore: Windows-MY");
Enumeration e = ks.aliases();
PrivateKey privateKey = null;
PublicKey publicKey = null;
while (e.hasMoreElements()) {
String alias = (String) e.nextElement();
if (alias.equals("6753664")) {
System.out.println("Loaded entry: " + alias);
privateKey = (PrivateKey) ks.getKey(alias, null);
publicKey = (PublicKey) ks.getCertificate(alias).getPublicKey();
}
}
if (privateKey == null || publicKey == null) {
throw new Exception("Cannot load the keys need to run this test");
}
System.out.println("-------------------------------------------------");
generatedSignatures.add(signUsing("SHA256withRSA", privateKey));
generatedSignatures.add(signUsing("SHA384withRSA", privateKey));
generatedSignatures.add(signUsing("SHA512withRSA", privateKey));
System.out.println("-------------------------------------------------");
verifyUsing("SHA256withRSA", publicKey, generatedSignatures.get(0));
verifyUsing("SHA384withRSA", publicKey, generatedSignatures.get(1));
verifyUsing("SHA512withRSA", publicKey, generatedSignatures.get(2));
System.out.println("-------------------------------------------------");
}
private static byte[] signUsing(String signAlgorithm,
PrivateKey privateKey) throws Exception {
// Must explicitly specify the SunMSCAPI JCE provider
// (otherwise SunJCE is chosen because it appears earlier in the list)
Signature sig1 = Signature.getInstance(signAlgorithm, "SunMSCAPI");
if (sig1 == null) {
throw new Exception("'" + signAlgorithm + "' is not supported");
}
System.out.println("Using " + signAlgorithm + " signer from the " +
sig1.getProvider().getName() + " JCE provider");
System.out.println("Using key: " + privateKey);
sig1.initSign(privateKey);
sig1.update(toBeSigned);
byte [] sigBytes = null;
try {
sigBytes = sig1.sign();
System.out.println("Generated RSA signature over a " +
toBeSigned.length + "-byte data (signature length: " +
sigBytes.length * 8 + " bits)");
System.out.println(String.format("0x%0" +
(sigBytes.length * 2) + "x",
new java.math.BigInteger(1, sigBytes)));
} catch (SignatureException se) {
System.out.println("Error generating RSA signature: " + se);
}
return sigBytes;
}
private static void verifyUsing(String signAlgorithm, PublicKey publicKey,
byte[] signature) throws Exception {
// Must explicitly specify the SunMSCAPI JCE provider
// (otherwise SunJCE is chosen because it appears earlier in the list)
Signature sig1 = Signature.getInstance(signAlgorithm, "SunMSCAPI");
if (sig1 == null) {
throw new Exception("'" + signAlgorithm + "' is not supported");
}
System.out.println("Using " + signAlgorithm + " verifier from the "
+ sig1.getProvider().getName() + " JCE provider");
System.out.println("Using key: " + publicKey);
System.out.println("\nVerifying RSA Signature over a " +
toBeSigned.length + "-byte data (signature length: " +
signature.length * 8 + " bits)");
System.out.println(String.format("0x%0" + (signature.length * 2) +
"x", new java.math.BigInteger(1, signature)));
sig1.initVerify(publicKey);
sig1.update(toBeSigned);
if (sig1.verify(signature)) {
System.out.println("Verify PASSED\n");
} else {
throw new Exception("Verify FAILED");
}
}
}
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