util-testing/club/wpia/gigi/util/SimpleSigner.java

   1 package club.wpia.gigi.util;
   2
   3 import java.io.File;
   4 import java.io.FileInputStream;
   5 import java.io.FileNotFoundException;
   6 import java.io.FileOutputStream;
   7 import java.io.IOException;
   8 import java.io.InputStream;
   9 import java.io.InputStreamReader;
  10 import java.io.PrintWriter;
  11 import java.io.Reader;
  12 import java.math.BigInteger;
  13 import java.nio.file.Paths;
  14 import java.security.GeneralSecurityException;
  15 import java.security.KeyFactory;
  16 import java.security.NoSuchAlgorithmException;
  17 import java.security.PrivateKey;
  18 import java.security.PublicKey;
  19 import java.security.Signature;
  20 import java.security.cert.CertificateFactory;
  21 import java.security.cert.X509Certificate;
  22 import java.security.spec.InvalidKeySpecException;
  23 import java.security.spec.PKCS8EncodedKeySpec;
  24 import java.sql.SQLException;
  25 import java.sql.Timestamp;
  26 import java.text.ParseException;
  27 import java.text.SimpleDateFormat;
  28 import java.util.Base64;
  29 import java.util.Calendar;
  30 import java.util.Date;
  31 import java.util.GregorianCalendar;
  32 import java.util.HashMap;
  33 import java.util.LinkedList;
  34 import java.util.List;
  35 import java.util.Map;
  36 import java.util.Map.Entry;
  37 import java.util.Properties;
  38 import java.util.TimeZone;
  39
  40 import javax.security.auth.x500.X500Principal;
  41
  42 import club.wpia.gigi.crypto.SPKAC;
  43 import club.wpia.gigi.database.DatabaseConnection;
  44 import club.wpia.gigi.database.GigiPreparedStatement;
  45 import club.wpia.gigi.database.GigiResultSet;
  46 import club.wpia.gigi.database.DatabaseConnection.Link;
  47 import club.wpia.gigi.dbObjects.CertificateProfile;
  48 import club.wpia.gigi.dbObjects.Digest;
  49 import club.wpia.gigi.dbObjects.Certificate.CSRType;
  50 import club.wpia.gigi.dbObjects.Certificate.SANType;
  51 import club.wpia.gigi.dbObjects.Certificate.SubjectAlternateName;
  52 import club.wpia.gigi.output.DateSelector;
  53 import club.wpia.gigi.util.KeyStorage;
  54 import club.wpia.gigi.util.PEM;
  55 import sun.security.pkcs10.PKCS10;
  56 import sun.security.util.DerOutputStream;
  57 import sun.security.util.DerValue;
  58 import sun.security.util.ObjectIdentifier;
  59 import sun.security.x509.AVA;
  60 import sun.security.x509.AlgorithmId;
  61 import sun.security.x509.GeneralNameInterface;
  62 import sun.security.x509.RDN;
  63 import sun.security.x509.X500Name;
  64
  65 public class SimpleSigner {
  66
  67     private static GigiPreparedStatement warnMail;
  68
  69     private static GigiPreparedStatement updateMail;
  70
  71     private static GigiPreparedStatement readyCerts;
  72
  73     private static GigiPreparedStatement getSANSs;
  74
  75     private static GigiPreparedStatement revoke;
  76
  77     private static GigiPreparedStatement revokeCompleted;
  78
  79     private static GigiPreparedStatement finishJob;
  80
  81     private static GigiPreparedStatement locateCA;
  82
  83     private static volatile boolean running = true;
  84
  85     private static Thread runner;
  86
  87     private static SimpleDateFormat sdf = new SimpleDateFormat("yyMMddHHmmss'Z'");
  88
  89     static {
  90         TimeZone.setDefault(TimeZone.getTimeZone("UTC"));
  91         sdf.setTimeZone(TimeZone.getTimeZone("UTC"));
  92     }
  93
  94     public static void main(String[] args) throws IOException, SQLException, InterruptedException {
  95         Properties p = new Properties();
  96         try (Reader reader = new InputStreamReader(new FileInputStream("config/gigi.properties"), "UTF-8")) {
  97             p.load(reader);
  98         }
  99         DatabaseConnection.init(p);
 100
 101         runSigner();
 102     }
 103
 104     public static void stopSigner() throws InterruptedException {
 105         Thread capturedRunner;
 106         synchronized (SimpleSigner.class) {
 107             if (runner == null) {
 108                 throw new IllegalStateException("already stopped");
 109             }
 110             capturedRunner = runner;
 111             running = false;
 112             SimpleSigner.class.notifyAll();
 113         }
 114         capturedRunner.join();
 115     }
 116
 117     public synchronized static void runSigner() throws SQLException, IOException, InterruptedException {
 118         if (runner != null) {
 119             throw new IllegalStateException("already running");
 120         }
 121         running = true;
 122
 123         runner = new Thread() {
 124
 125             @Override
 126             public void run() {
 127                 try (Link l = DatabaseConnection.newLink(false)) {
 128                     readyCerts = new GigiPreparedStatement("SELECT certs.id AS id, certs.csr_name, jobs.id AS jobid, csr_type, md, `executeFrom`, `executeTo`, profile FROM jobs " + //
 129                             "INNER JOIN certs ON certs.id=jobs.`targetId` " + //
 130                             "INNER JOIN profiles ON profiles.id=certs.profile " + //
 131                             "WHERE jobs.state='open' " + //
 132                             "AND task='sign'");
 133
 134                     getSANSs = new GigiPreparedStatement("SELECT contents, type FROM `subjectAlternativeNames` " + //
 135                             "WHERE `certId`=?");
 136
 137                     updateMail = new GigiPreparedStatement("UPDATE certs SET crt_name=?," + " created=NOW(), serial=?, caid=? WHERE id=?");
 138                     warnMail = new GigiPreparedStatement("UPDATE jobs SET warning=warning+1, state=CASE WHEN warning<3 THEN 'open'::`jobState` ELSE 'error'::`jobState` END WHERE id=?");
 139
 140                     revoke = new GigiPreparedStatement("SELECT certs.id, certs.csr_name,jobs.id FROM jobs INNER JOIN certs ON jobs.`targetId`=certs.id" + " WHERE jobs.state='open' AND task='revoke'");
 141                     revokeCompleted = new GigiPreparedStatement("UPDATE certs SET revoked=NOW() WHERE id=?");
 142
 143                     finishJob = new GigiPreparedStatement("UPDATE jobs SET state='done' WHERE id=?");
 144
 145                     locateCA = new GigiPreparedStatement("SELECT id FROM cacerts WHERE keyname=?");
 146
 147                     work();
 148                 } catch (InterruptedException e) {
 149                     throw new Error(e);
 150                 }
 151             }
 152
 153         };
 154         runner.start();
 155     }
 156
 157     public static void ping() {
 158         synchronized (SimpleSigner.class) {
 159             SimpleSigner.class.notifyAll();
 160             try {
 161                 SimpleSigner.class.wait(2000);
 162             } catch (InterruptedException e) {
 163                 e.printStackTrace();
 164             }
 165         }
 166     }
 167
 168     private synchronized static void work() {
 169         try {
 170             gencrl();
 171         } catch (IOException e2) {
 172             e2.printStackTrace();
 173         } catch (InterruptedException e2) {
 174             e2.printStackTrace();
 175         }
 176
 177         while (running) {
 178             try {
 179                 signCertificates();
 180                 revokeCertificates();
 181
 182                 SimpleSigner.class.notifyAll();
 183                 SimpleSigner.class.wait(5000);
 184             } catch (IOException e) {
 185                 e.printStackTrace();
 186             } catch (SQLException e) {
 187                 e.printStackTrace();
 188             } catch (InterruptedException e1) {
 189             }
 190         }
 191         runner = null;
 192     }
 193
 194     private static void revokeCertificates() throws SQLException, IOException, InterruptedException {
 195         GigiResultSet rs = revoke.executeQuery();
 196         boolean worked = false;
 197         while (rs.next()) {
 198             int id = rs.getInt(1);
 199             worked = true;
 200             System.out.println("Revoke faked: " + id);
 201             revokeCompleted.setInt(1, id);
 202             revokeCompleted.execute();
 203             finishJob.setInt(1, rs.getInt(3));
 204             finishJob.execute();
 205         }
 206         if (worked) {
 207             gencrl();
 208         }
 209     }
 210
 211     private static void gencrl() throws IOException, InterruptedException {
 212         if (true) {
 213             return;
 214         }
 215         String[] call = new String[] {
 216                 "openssl",
 217                 "ca",//
 218                 "-cert",
 219                 "../unassured.crt",//
 220                 "-keyfile",
 221                 "../unassured.key",//
 222                 "-gencrl",//
 223                 "-crlhours",//
 224                 "12",//
 225                 "-out",
 226                 "../unassured.crl",//
 227                 "-config",
 228                 "../selfsign.config"
 229
 230         };
 231         Process p1 = Runtime.getRuntime().exec(call, null, new File("keys/unassured.ca"));
 232         if (p1.waitFor() != 0) {
 233             System.out.println("Error while generating crl.");
 234         }
 235     }
 236
 237     private static void signCertificates() throws SQLException {
 238         GigiResultSet rs = readyCerts.executeQuery();
 239
 240         Calendar c = Calendar.getInstance();
 241         c.setTimeZone(TimeZone.getTimeZone("UTC"));
 242         while (rs.next()) {
 243             String csrname = rs.getString("csr_name");
 244             int id = rs.getInt("id");
 245             System.out.println("sign: " + csrname);
 246             try {
 247                 String csrType = rs.getString("csr_type");
 248                 CSRType ct = CSRType.valueOf(csrType);
 249                 File crt = KeyStorage.locateCrt(id);
 250
 251                 Timestamp from = rs.getTimestamp("executeFrom");
 252                 String length = rs.getString("executeTo");
 253                 Date fromDate;
 254                 Date toDate;
 255                 if (from == null) {
 256                     fromDate = new Date(System.currentTimeMillis());
 257                 } else {
 258                     fromDate = new Date(from.getTime());
 259                 }
 260                 if (length.endsWith("m") || length.endsWith("y")) {
 261                     String num = length.substring(0, length.length() - 1);
 262                     int inter = Integer.parseInt(num);
 263                     c.setTime(fromDate);
 264                     if (length.endsWith("m")) {
 265                         c.add(Calendar.MONTH, inter);
 266                     } else {
 267                         c.add(Calendar.YEAR, inter);
 268                     }
 269                     toDate = c.getTime();
 270                 } else {
 271                     toDate = DateSelector.getDateFormat().parse(length);
 272                 }
 273
 274                 getSANSs.setInt(1, id);
 275                 GigiResultSet san = getSANSs.executeQuery();
 276
 277                 LinkedList<SubjectAlternateName> altnames = new LinkedList<>();
 278                 while (san.next()) {
 279                     altnames.add(new SubjectAlternateName(SANType.valueOf(san.getString("type").toUpperCase()), san.getString("contents")));
 280                 }
 281                 // TODO look them up!
 282                 // cfg.println("keyUsage=critical," +
 283                 // "digitalSignature, keyEncipherment, keyAgreement");
 284                 // cfg.println("extendedKeyUsage=critical," + "clientAuth");
 285                 // cfg.close();
 286
 287                 int profile = rs.getInt("profile");
 288                 CertificateProfile cp = CertificateProfile.getById(profile);
 289                 String s = cp.getId() + "";
 290                 while (s.length() < 4) {
 291                     s = "0" + s;
 292                 }
 293                 s += "-" + cp.getKeyName() + ".cfg";
 294                 Properties caP = new Properties();
 295                 try (FileInputStream inStream = new FileInputStream("signer/profiles/" + s)) {
 296                     caP.load(inStream);
 297                 }
 298
 299                 HashMap<String, String> subj = new HashMap<>();
 300                 try (GigiPreparedStatement ps = new GigiPreparedStatement("SELECT name, value FROM `certAvas` WHERE `certId`=?")) {
 301                     ps.setInt(1, rs.getInt("id"));
 302                     GigiResultSet rs2 = ps.executeQuery();
 303                     while (rs2.next()) {
 304                         String name = rs2.getString("name");
 305                         if (name.equals("EMAIL")) {
 306                             name = "emailAddress";
 307                         }
 308                         subj.put(name, rs2.getString("value"));
 309                     }
 310                 }
 311                 if (subj.size() == 0) {
 312                     subj.put("CN", "<empty>");
 313                     System.out.println("WARNING: DN was empty");
 314                 }
 315                 System.out.println(subj);
 316
 317                 PublicKey pk;
 318                 byte[] data = IOUtils.readURL(new FileInputStream(csrname));
 319                 if (ct == CSRType.SPKAC) {
 320                     String dt = new String(data, "UTF-8");
 321                     if (dt.startsWith("SPKAC=")) {
 322                         dt = dt.substring(6);
 323                         data = dt.getBytes("UTF-8");
 324                         System.out.println(dt);
 325                     }
 326                     SPKAC sp = new SPKAC(Base64.getDecoder().decode(data));
 327                     pk = sp.getPubkey();
 328                 } else {
 329                     PKCS10 p10 = new PKCS10(PEM.decode("(NEW )?CERTIFICATE REQUEST", new String(data, "UTF-8")));
 330                     pk = p10.getSubjectPublicKeyInfo();
 331                 }
 332                 Calendar cal = GregorianCalendar.getInstance();
 333                 String ca = caP.getProperty("ca") + "_" + cal.get(Calendar.YEAR) + (cal.get(Calendar.MONTH) >= 6 ? "_2" : "_1");
 334                 File parent = new File("signer/ca");
 335                 File[] caFiles = parent.listFiles();
 336                 if (null == caFiles) {
 337                     caFiles = new File[0];
 338                 }
 339                 if ( !new File(parent, ca).exists()) {
 340                     System.out.println("CA " + ca + " not found. Searching for anything other remotely fitting.");
 341                     for (File f : caFiles) {
 342                         if (f.getName().startsWith(caP.getProperty("ca"))) {
 343                             ca = f.getName();
 344                             break;
 345                         }
 346                     }
 347                 }
 348                 File caKey = new File(parent, ca + "/ca.key");
 349                 PrivateKey i = loadOpensslKey(caKey);
 350
 351                 X509Certificate root = (X509Certificate) CertificateFactory.getInstance("X509").generateCertificate(new FileInputStream("signer/ca/" + ca + "/ca.crt"));
 352                 byte[] cert = generateCert(pk, i, subj, root.getSubjectX500Principal(), altnames, fromDate, toDate, Digest.valueOf(rs.getString("md").toUpperCase()), caP.getProperty("eku"));
 353                 PrintWriter out = new PrintWriter(crt);
 354                 out.println("-----BEGIN CERTIFICATE-----");
 355                 out.println(Base64.getMimeEncoder().encodeToString(cert));
 356                 out.println("-----END CERTIFICATE-----");
 357                 out.close();
 358
 359                 try (InputStream is = new FileInputStream(crt)) {
 360                     locateCA.setString(1, ca);
 361                     GigiResultSet caRs = locateCA.executeQuery();
 362                     if ( !caRs.next()) {
 363                         throw new Error("ca " + ca + " was not found");
 364                     }
 365
 366                     CertificateFactory cf = CertificateFactory.getInstance("X.509");
 367                     X509Certificate crtp = (X509Certificate) cf.generateCertificate(is);
 368                     BigInteger serial = crtp.getSerialNumber();
 369                     updateMail.setString(1, crt.getPath());
 370                     updateMail.setString(2, serial.toString(16));
 371                     updateMail.setInt(3, caRs.getInt("id"));
 372                     updateMail.setInt(4, id);
 373                     updateMail.execute();
 374
 375                     finishJob.setInt(1, rs.getInt("jobid"));
 376                     finishJob.execute();
 377                     System.out.println("signed: " + id);
 378                     continue;
 379                 }
 380
 381             } catch (GeneralSecurityException e) {
 382                 e.printStackTrace();
 383             } catch (IOException e) {
 384                 e.printStackTrace();
 385             } catch (ParseException e) {
 386                 e.printStackTrace();
 387             }
 388             System.out.println("Error with: " + id);
 389             warnMail.setInt(1, rs.getInt("jobid"));
 390             warnMail.execute();
 391
 392         }
 393         rs.close();
 394     }
 395
 396     private static PrivateKey loadOpensslKey(File f) throws FileNotFoundException, IOException, InvalidKeySpecException, NoSuchAlgorithmException {
 397         byte[] p8b = PEM.decode("RSA PRIVATE KEY", new String(IOUtils.readURL(new FileInputStream(f))));
 398         DerOutputStream dos = new DerOutputStream();
 399         dos.putInteger(0);
 400         new AlgorithmId(new ObjectIdentifier(new int[] {
 401                 1, 2, 840, 113549, 1, 1, 1
 402         })).encode(dos);
 403         dos.putOctetString(p8b);
 404         byte[] ctx = dos.toByteArray();
 405         dos.reset();
 406         dos.write(DerValue.tag_Sequence, ctx);
 407         PKCS8EncodedKeySpec p8 = new PKCS8EncodedKeySpec(dos.toByteArray());
 408         PrivateKey i = KeyFactory.getInstance("RSA").generatePrivate(p8);
 409         return i;
 410     }
 411
 412     public static synchronized byte[] generateCert(PublicKey pk, PrivateKey prk, Map<String, String> subj, X500Principal issuer, List<SubjectAlternateName> altnames, Date fromDate, Date toDate, Digest digest, String eku) throws IOException, GeneralSecurityException {
 413         File f = Paths.get("signer", "serial").toFile();
 414         if ( !f.exists()) {
 415             try (FileOutputStream fos = new FileOutputStream(f)) {
 416                 fos.write("1".getBytes("UTF-8"));
 417             }
 418         }
 419         try (FileInputStream fr = new FileInputStream(f)) {
 420             byte[] serial = IOUtils.readURL(fr);
 421             BigInteger ser = new BigInteger(new String(serial).trim());
 422             ser = ser.add(BigInteger.ONE);
 423
 424             PrintWriter pw = new PrintWriter(f);
 425             pw.println(ser);
 426             pw.close();
 427             if (digest != Digest.SHA256 && digest != Digest.SHA512) {
 428                 System.err.println("assuming sha256 either way ;-): " + digest);
 429                 digest = Digest.SHA256;
 430             }
 431             ObjectIdentifier sha512withrsa = new ObjectIdentifier(new int[] {
 432                     1, 2, 840, 113549, 1, 1, digest == Digest.SHA256 ? 11 : 13
 433             });
 434             AlgorithmId aid = new AlgorithmId(sha512withrsa);
 435             Signature s = Signature.getInstance(digest == Digest.SHA256 ? "SHA256withRSA" : "SHA512withRSA");
 436
 437             DerOutputStream cert = new DerOutputStream();
 438             DerOutputStream content = new DerOutputStream();
 439             {
 440                 DerOutputStream version = new DerOutputStream();
 441                 version.putInteger(2); // v3
 442                 content.write(DerValue.createTag(DerValue.TAG_CONTEXT, true, (byte) 0), version);
 443             }
 444             content.putInteger(ser); // Serial
 445             aid.encode(content);
 446
 447             {
 448                 content.write(issuer.getEncoded());
 449             }
 450             {
 451                 DerOutputStream notAround = new DerOutputStream();
 452                 notAround.putUTCTime(fromDate);
 453                 notAround.putUTCTime(toDate);
 454                 content.write(DerValue.tag_Sequence, notAround);
 455             }
 456             {
 457
 458                 X500Name xn = genX500Name(subj);
 459                 content.write(xn.getEncoded());
 460             }
 461             {
 462                 content.write(pk.getEncoded());
 463             }
 464             {
 465                 DerOutputStream extensions = new DerOutputStream();
 466                 {
 467                     addExtension(extensions, new ObjectIdentifier(new int[] {
 468                             2, 5, 29, 17
 469                     }), generateSAN(altnames));
 470                     addExtension(extensions, new ObjectIdentifier(new int[] {
 471                             2, 5, 29, 15
 472                     }), generateKU());
 473                     addExtension(extensions, new ObjectIdentifier(new int[] {
 474                             2, 5, 29, 37
 475                     }), generateEKU(eku));
 476                 }
 477                 DerOutputStream extensionsSeq = new DerOutputStream();
 478                 extensionsSeq.write(DerValue.tag_Sequence, extensions);
 479                 content.write(DerValue.createTag(DerValue.TAG_CONTEXT, true, (byte) 3), extensionsSeq);
 480             }
 481
 482             DerOutputStream contentSeq = new DerOutputStream();
 483
 484             contentSeq.write(DerValue.tag_Sequence, content.toByteArray());
 485
 486             s.initSign(prk);
 487             s.update(contentSeq.toByteArray());
 488
 489             aid.encode(contentSeq);
 490             contentSeq.putBitString(s.sign());
 491             cert.write(DerValue.tag_Sequence, contentSeq);
 492
 493             // X509Certificate c = (X509Certificate)
 494             // CertificateFactory.getInstance("X509").generateCertificate(new
 495             // ByteArrayInputStream(cert.toByteArray()));
 496             // c.verify(pk); only for self-signeds
 497
 498             byte[] res = cert.toByteArray();
 499             cert.close();
 500             return res;
 501         }
 502
 503     }
 504
 505     private static byte[] generateKU() throws IOException {
 506         try (DerOutputStream dos = new DerOutputStream()) {
 507             dos.putBitString(new byte[] {
 508                     (byte) 0b10101000
 509             });
 510             return dos.toByteArray();
 511         }
 512     }
 513
 514     private static byte[] generateEKU(String eku) throws IOException {
 515
 516         try (DerOutputStream dos = new DerOutputStream()) {
 517             for (String name : eku.split(",")) {
 518                 name = name.trim();
 519                 ObjectIdentifier oid;
 520                 switch (name) {
 521                 case "serverAuth":
 522                     oid = new ObjectIdentifier("1.3.6.1.5.5.7.3.1");
 523                     break;
 524                 case "clientAuth":
 525                     oid = new ObjectIdentifier("1.3.6.1.5.5.7.3.2");
 526                     break;
 527                 case "codeSigning":
 528                     oid = new ObjectIdentifier("1.3.6.1.5.5.7.3.3");
 529                     break;
 530                 case "emailProtection":
 531                     oid = new ObjectIdentifier("1.3.6.1.5.5.7.3.4");
 532                     break;
 533                 case "OCSPSigning":
 534                     oid = new ObjectIdentifier("1.3.6.1.5.5.7.3.9");
 535                     break;
 536
 537                 default:
 538                     throw new Error(name);
 539                 }
 540                 dos.putOID(oid);
 541             }
 542             byte[] data = dos.toByteArray();
 543             dos.reset();
 544             dos.write(DerValue.tag_Sequence, data);
 545             return dos.toByteArray();
 546         }
 547     }
 548
 549     public static X500Name genX500Name(Map<String, String> subj) throws IOException {
 550         LinkedList<RDN> rdns = new LinkedList<>();
 551         for (Entry<String, String> i : subj.entrySet()) {
 552             RDN rdn = genRDN(i);
 553             rdns.add(rdn);
 554         }
 555         return new X500Name(rdns.toArray(new RDN[rdns.size()]));
 556     }
 557
 558     private static RDN genRDN(Entry<String, String> i) throws IOException {
 559         DerOutputStream dos = new DerOutputStream();
 560         dos.putUTF8String(i.getValue());
 561         int[] oid;
 562         String key = i.getKey();
 563         switch (key) {
 564         case "CN":
 565             oid = new int[] {
 566                     2, 5, 4, 3
 567             };
 568             break;
 569         case "EMAIL":
 570         case "emailAddress":
 571             oid = new int[] {
 572                     1, 2, 840, 113549, 1, 9, 1
 573             };
 574             break;
 575         case "O":
 576             oid = new int[] {
 577                     2, 5, 4, 10
 578             };
 579             break;
 580         case "OU":
 581             oid = new int[] {
 582                     2, 5, 4, 11
 583             };
 584             break;
 585         case "ST":
 586             oid = new int[] {
 587                     2, 5, 4, 8
 588             };
 589             break;
 590         case "L":
 591             oid = new int[] {
 592                     2, 5, 4, 7
 593             };
 594             break;
 595         case "C":
 596             oid = new int[] {
 597                     2, 5, 4, 6
 598             };
 599             break;
 600         default:
 601             dos.close();
 602             throw new Error("unknown RDN-type: " + key);
 603         }
 604         RDN rdn = new RDN(new AVA(new ObjectIdentifier(oid), new DerValue(dos.toByteArray())));
 605         dos.close();
 606         return rdn;
 607     }
 608
 609     private static void addExtension(DerOutputStream extensions, ObjectIdentifier oid, byte[] extContent) throws IOException {
 610         DerOutputStream SANs = new DerOutputStream();
 611         SANs.putOID(oid);
 612         SANs.putOctetString(extContent);
 613
 614         extensions.write(DerValue.tag_Sequence, SANs);
 615     }
 616
 617     private static byte[] generateSAN(List<SubjectAlternateName> altnames) throws IOException {
 618         DerOutputStream SANContent = new DerOutputStream();
 619         for (SubjectAlternateName san : altnames) {
 620             byte type = 0;
 621             if (san.getType() == SANType.DNS) {
 622                 type = (byte) GeneralNameInterface.NAME_DNS;
 623             } else if (san.getType() == SANType.EMAIL) {
 624                 type = (byte) GeneralNameInterface.NAME_RFC822;
 625             } else {
 626                 SANContent.close();
 627                 throw new Error("" + san.getType());
 628             }
 629             SANContent.write(DerValue.createTag(DerValue.TAG_CONTEXT, false, type), san.getName().getBytes("UTF-8"));
 630         }
 631         DerOutputStream SANSeqContent = new DerOutputStream();
 632         SANSeqContent.write(DerValue.tag_Sequence, SANContent);
 633         byte[] byteArray = SANSeqContent.toByteArray();
 634         SANContent.close();
 635         SANSeqContent.close();
 636         return byteArray;
 637     }
 638 }