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/* TestECDSA -- Ensure ECDSA signatures are working.
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Copyright (C) 2016 Red Hat, Inc.
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU Affero General Public License as
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published by the Free Software Foundation, either version 3 of the
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License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Affero General Public License for more details.
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You should have received a copy of the GNU Affero General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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import java.math.BigInteger;
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import java.security.KeyPair;
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import java.security.KeyPairGenerator;
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import java.security.Signature;
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/**
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* @test
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*/
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public class TestECDSA {
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public static void main(String[] args) throws Exception {
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KeyPairGenerator keyGen = KeyPairGenerator.getInstance("EC");
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KeyPair key = keyGen.generateKeyPair();
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byte[] data = "This is a string to sign".getBytes("UTF-8");
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Signature dsa = Signature.getInstance("NONEwithECDSA");
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dsa.initSign(key.getPrivate());
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dsa.update(data);
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byte[] sig = dsa.sign();
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System.out.println("Signature: " + new BigInteger(1, sig).toString(16));
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Signature dsaCheck = Signature.getInstance("NONEwithECDSA");
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dsaCheck.initVerify(key.getPublic());
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dsaCheck.update(data);
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boolean success = dsaCheck.verify(sig);
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if (!success) {
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throw new RuntimeException("Test failed. Signature verification error");
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}
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System.out.println("Test passed.");
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}
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}
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