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/*

 * @test

 * @bug 6316539 8136355

 * @summary Basic tests for TlsRsaPremasterSecret generator

 * @author Andreas Sterbenz

 * @library ..

 * @modules java.base/sun.security.internal.spec

 * @run main/othervm TestPremaster

 * @run main/othervm TestPremaster sm policy

 */

import java.security.Provider;

import java.security.InvalidAlgorithmParameterException;

import javax.crypto.KeyGenerator;

import javax.crypto.SecretKey;

import sun.security.internal.spec.TlsRsaPremasterSecretParameterSpec;

public class TestPremaster extends PKCS11Test {

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

        main(new TestPremaster(), args);

    }

    @Override

    public void main(Provider provider) throws Exception {

        if (provider.getService(

                "KeyGenerator", "SunTlsRsaPremasterSecret") == null) {

            System.out.println("Not supported by provider, skipping");

            return;

        }

        KeyGenerator kg;

        kg = KeyGenerator.getInstance("SunTlsRsaPremasterSecret", provider);

        try {

            kg.generateKey();

            throw new Exception("no exception");

        } catch (IllegalStateException e) {

            System.out.println("OK: " + e);

        }

        int[] protocolVersions = {0x0300, 0x0301, 0x0302};

        for (int clientVersion : protocolVersions) {

            for (int serverVersion : protocolVersions) {

                test(kg, clientVersion, serverVersion);

                if (serverVersion >= clientVersion) {

                    break;

                }

            }

        }

        System.out.println("Done.");

    }

    private static void test(KeyGenerator kg,

            int clientVersion, int serverVersion) throws Exception {

        System.out.printf(

                "Testing RSA pre-master secret key generation between " +

                "client (0x%04X) and server(0x%04X)%n",

                clientVersion, serverVersion);

        try {

            kg.init(new TlsRsaPremasterSecretParameterSpec(

                                    clientVersion, serverVersion));

        } catch (InvalidAlgorithmParameterException iape) {

            // S12 removed support for SSL v3.0

            if (clientVersion == 0x300 || serverVersion == 0x300) {

                System.out.println("Skip testing SSLv3 due to no support");

                return;

            }

            // unexpected, pass it up

            throw iape;

        }

        SecretKey key = kg.generateKey();

        byte[] encoded = key.getEncoded();

        if (encoded != null) {  // raw key material may be not extractable

            if (encoded.length != 48) {

                throw new Exception("length: " + encoded.length);

            }

            int v = versionOf(encoded[0], encoded[1]);

            if (clientVersion != v) {

                if (serverVersion != v || clientVersion >= 0x0302) {

                    throw new Exception(String.format(

                        "version mismatch: (0x%04X) rather than (0x%04X) " +

                        "is used in pre-master secret", v, clientVersion));

                }

                System.out.printf("Use compatible version (0x%04X)%n", v);

            }

            System.out.println("Passed, version matches!");

       } else {

            System.out.println("Raw key material is not extractable");

       }

    }

    private static int versionOf(int major, int minor) {

        return ((major & 0xFF) << 8) | (minor & 0xFF);

    }

}