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/**

 * @test

 * @bug 6405536

 * @summary basic test of ECDSA signatures for P-256 and P-384 from the

 * example data in "Suite B Implementer's Guide to FIPS 186-3".

 * @library ..

 * @library ../../../../java/security/testlibrary

 * @modules java.base/sun.security.util

 * @compile -XDignore.symbol.file TestECDSA2.java

 */

import java.math.BigInteger;

public class TestECDSA2 extends PKCS11Test {

    // values of the keys we use for the tests

    // keypair using NIST P-256

    private final static String privD256 = "70a12c2db16845ed56ff68cfc21a472b3f04d7d6851bf6349f2d7d5b3452b38a";

    private final static String pubX256 = "8101ece47464a6ead70cf69a6e2bd3d88691a3262d22cba4f7635eaff26680a8";

    private final static String pubY256 = "d8a12ba61d599235f67d9cb4d58f1783d3ca43e78f0a5abaa624079936c0c3a9";

    // keypair using NIST P-384

    private final static String privD384 = "c838b85253ef8dc7394fa5808a5183981c7deef5a69ba8f4f2117ffea39cfcd90e95f6cbc854abacab701d50c1f3cf24";

    private final static String pubX384 = "1fbac8eebd0cbf35640b39efe0808dd774debff20a2a329e91713baf7d7f3c3e81546d883730bee7e48678f857b02ca0";

    private final static String pubY384 = "eb213103bd68ce343365a8a4c3d4555fa385f5330203bdd76ffad1f3affb95751c132007e1b240353cb0a4cf1693bdf9";

    // data to be signed

    private final static byte[] data = "This is only a test message. It is 48 bytes long".getBytes();

    private KeyFactory kf = null;

    private static void testSignAndVerify(String alg, KeyPair kp, Provider p) throws Exception {

        Signature s = Signature.getInstance(alg, p);

        s.initSign(kp.getPrivate());

        s.update(data);

        byte[] result = s.sign();

        s.initVerify(kp.getPublic());

        s.update(data);

        if (!s.verify(result)) {

            throw new Exception("Error: Signature verification failed");

        }

        System.out.println(p.getName() + ": " + alg + " Passed");

    }

    private KeyPair genECKeyPair(String curvName, String privD, String pubX,

            String pubY, Provider p) throws Exception {

        ECPrivateKeySpec privKeySpec =

            new ECPrivateKeySpec(new BigInteger(privD, 16), ecParams);

        ECPublicKeySpec pubKeySpec =

            new ECPublicKeySpec(new ECPoint(new BigInteger(pubX, 16), new BigInteger(pubY, 16)),

                                ecParams);

        PrivateKey privKey = kf.generatePrivate(privKeySpec);

        PublicKey pubKey = kf.generatePublic(pubKeySpec);

        return new KeyPair(pubKey, privKey);

    }

    public static void main(String[] args) throws Exception {

    }

    public void main(Provider provider) throws Exception {

        boolean testP256 =

            (provider.getService("Signature", "SHA256withECDSA") != null);

        boolean testP384 =

            (provider.getService("Signature", "SHA384withECDSA") != null);

        if (!testP256 && !testP384) {

            System.out.println("ECDSA not supported, skipping");

            return;

        }

            return;

        }

        kf = KeyFactory.getInstance("EC", provider);

        long start = System.currentTimeMillis();

        if (testP256) {

            // can use secp256r1, NIST P-256, X9.62 prime256v1, or 1.2.840.10045.3.1.7

            KeyPair kp =

                genECKeyPair("secp256r1", privD256, pubX256, pubY256, provider);

            testSignAndVerify("SHA256withECDSA", kp, provider);

        }

        if (testP384) {

            // can use secp384r1, NIST P-384, 1.3.132.0.34

            KeyPair kp =

                genECKeyPair("secp384r1", privD384, pubX384, pubY384, provider);

            testSignAndVerify("SHA384withECDSA", kp, provider);

        }

        long stop = System.currentTimeMillis();

        System.out.println("All tests passed (" + (stop - start) + " ms).");

    }

}