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/*

 * @test

 * @bug 6405536 6414980 8051972

 * @summary Make sure that we can parse certificates using various named curves

 *   and verify their signatures

 * @author Andreas Sterbenz

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

 * @modules jdk.crypto.cryptoki

 * @run main/othervm ReadCertificates

 * @run main/othervm ReadCertificates sm policy

 */

import java.io.File;

import java.io.FileInputStream;

import java.io.InputStream;

import java.security.InvalidKeyException;

import java.security.NoSuchAlgorithmException;

import java.security.NoSuchProviderException;

import java.security.Provider;

import java.security.PublicKey;

import java.security.SecureRandom;

import java.security.SignatureException;

import java.security.cert.CertificateException;

import java.security.cert.CertificateFactory;

import java.security.cert.X509Certificate;

import java.security.interfaces.ECPublicKey;

import java.security.spec.ECParameterSpec;

import java.util.ArrayList;

import java.util.Arrays;

import java.util.Collection;

import java.util.LinkedHashMap;

import java.util.List;

import java.util.Map;

import javax.security.auth.x500.X500Principal;

public class ReadCertificates extends PKCS11Test {

    private static CertificateFactory factory;

    private static SecureRandom random;

    private static Collection<X509Certificate> readCertificates(File file) throws Exception {

        System.out.println("Loading " + file.getName() + "...");

        Collection<X509Certificate> certs;

        try (InputStream in = new FileInputStream(file)) {

            certs = (Collection<X509Certificate>)factory.generateCertificates(in);

        }

        return certs;

    }

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

        main(new ReadCertificates(), args);

    }

    @Override

    public void main(Provider p) throws Exception {

        if (p.getService("Signature", "SHA1withECDSA") == null) {

            System.out.println("Provider does not support ECDSA, skipping...");

            return;

        }

        /*

         * PKCS11Test.main will remove this provider if needed

         */

        Providers.setAt(p, 1);

        random = new SecureRandom();

        factory = CertificateFactory.getInstance("X.509");

        try {

            // clear certificate cache in from a previous run with a different

            // provider (undocumented hack for the Sun provider)

            factory.generateCertificate(null);

        } catch (CertificateException e) {

            // ignore

        }

        Map<X500Principal,X509Certificate> certs = new LinkedHashMap<>();

        File dir = new File(BASE, "certs");

        File closedDir = new File(CLOSED_BASE, "certs");

        File[] files = concat(dir.listFiles(), closedDir.listFiles());

        Arrays.sort(files);

        for (File file : files) {

            if (file.isFile() == false) {

                continue;

            }

            Collection<X509Certificate> certList = readCertificates(file);

            for (X509Certificate cert : certList) {

                X509Certificate old = certs.put(cert.getSubjectX500Principal(), cert);

                if (old != null) {

                    System.out.println("Duplicate subject:");

                    System.out.println("Old Certificate: " + old);

                    System.out.println("New Certificate: " + cert);

                    throw new Exception(file.getPath());

                }

            }

        }

        System.out.println("OK: " + certs.size() + " certificates.");

        // Get supported curves

        List<ECParameterSpec> supportedEC = getKnownCurves(p);

        System.out.println("Test Certs:\n");

        for (X509Certificate cert : certs.values()) {

            X509Certificate issuer = certs.get(cert.getIssuerX500Principal());

            System.out.print("Verifying " + cert.getSubjectX500Principal() +

                    "...  ");

            PublicKey key = issuer.getPublicKey();

            // Check if curve is supported

            if (issuer.getPublicKey() instanceof ECPublicKey) {

                if (!checkSupport(supportedEC,

                        ((ECPublicKey)key).getParams())) {

                    System.out.println("Curve not found. Skipped.");

                    continue;

                }

            }

           try {

               cert.verify(key, p.getName());

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

           } catch (NoSuchAlgorithmException e) {

               System.out.println("Warning: " + e.getMessage() +

                   ". Trying another provider...");

               cert.verify(key);

           } catch (CertificateException | InvalidKeyException |

                    NoSuchProviderException | SignatureException e) {

               System.out.println(e.getMessage());

               if (key instanceof ECPublicKey) {

                   System.out.println("Failed.\n\tCurve: " +

                           ((ECPublicKey)key).getParams() +

                           "\n\tSignature Alg: " + cert.getSigAlgName());

               } else {

                   System.out.println("Key: "+key.toString());

               }

               System.err.println("Verifying " + cert.getSubjectX500Principal());

               e.printStackTrace();

           }

        }

        // try some random invalid signatures to make sure we get the correct

        // error

        System.out.println("Checking incorrect signatures...");

        List<X509Certificate> certList = new ArrayList<>(certs.values());

        for (int i = 0; i < 20; i++) {

            X509Certificate cert, signer;

            do {

                cert = getRandomCert(certList);

                signer = getRandomCert(certList);

            } while (cert.getIssuerX500Principal().equals(signer.getSubjectX500Principal()));

            try {

                PublicKey signerPublicKey = signer.getPublicKey();

                cert.verify(signerPublicKey);

                // Ignore false positives

                if (cert.getPublicKey().equals(signerPublicKey)) {

                    System.out.println("OK: self-signed certificate detected");

                } else {

                    throw new Exception("Verified invalid signature");

                }

            } catch (SignatureException | InvalidKeyException e) {

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

            }

        }

        System.out.println("OK");

    }

    private static X509Certificate getRandomCert(List<X509Certificate> certs) {

        int n = random.nextInt(certs.size());

        return certs.get(n);

    }

}