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/* TestECDSA -- Ensure ECDSA signatures are working.
Copyright (C) 2016 Red Hat, Inc.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as
published by the Free Software Foundation, either version 3 of the
License, or (at your option) any later version.
This program 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 Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
import java.math.BigInteger;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.Signature;
/**
* @test
*/
public class TestECDSA {
public static void main(String[] args) throws Exception {
KeyPairGenerator keyGen = KeyPairGenerator.getInstance("EC");
KeyPair key = keyGen.generateKeyPair();
byte[] data = "This is a string to sign".getBytes("UTF-8");
Signature dsa = Signature.getInstance("NONEwithECDSA");
dsa.initSign(key.getPrivate());
dsa.update(data);
byte[] sig = dsa.sign();
System.out.println("Signature: " + new BigInteger(1, sig).toString(16));
Signature dsaCheck = Signature.getInstance("NONEwithECDSA");
dsaCheck.initVerify(key.getPublic());
dsaCheck.update(data);
boolean success = dsaCheck.verify(sig);
if (!success) {
throw new RuntimeException("Test failed. Signature verification error");
}
System.out.println("Test passed.");
}
}
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