1 /* 2 * Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26 package sun.security.provider; 27 28 import java.io.*; 29 import java.security.*; 30 import java.security.cert.Certificate; 31 import java.security.cert.CertificateFactory; 32 import java.security.cert.CertificateException; 33 import java.util.*; 34 35 import sun.misc.IOUtils; 36 import sun.security.pkcs.EncryptedPrivateKeyInfo; 37 import sun.security.pkcs12.PKCS12KeyStore; 38 39 /** 40 * This class provides the keystore implementation referred to as "JKS". 41 * 42 * @author Jan Luehe 43 * @author David Brownell 44 * 45 * 46 * @see KeyProtector 47 * @see java.security.KeyStoreSpi 48 * @see KeyTool 49 * 50 * @since 1.2 51 */ 52 53 abstract class JavaKeyStore extends KeyStoreSpi { 54 55 // regular JKS 56 public static final class JKS extends JavaKeyStore { 57 String convertAlias(String alias) { 58 return alias.toLowerCase(Locale.ENGLISH); 59 } 60 } 61 62 // special JKS that uses case sensitive aliases 63 public static final class CaseExactJKS extends JavaKeyStore { 64 String convertAlias(String alias) { 65 return alias; 66 } 67 } 68 69 // special JKS that supports JKS and PKCS12 file formats 70 public static final class DualFormatJKS extends KeyStoreDelegator { 71 public DualFormatJKS() { 72 super("JKS", JKS.class, "PKCS12", PKCS12KeyStore.class); 73 } 74 } 75 76 private static final int MAGIC = 0xfeedfeed; 77 private static final int VERSION_1 = 0x01; 78 private static final int VERSION_2 = 0x02; 79 80 // Private keys and their supporting certificate chains 81 private static class KeyEntry { 82 Date date; // the creation date of this entry 83 byte[] protectedPrivKey; 84 Certificate chain[]; 85 }; 86 87 // Trusted certificates 88 private static class TrustedCertEntry { 89 Date date; // the creation date of this entry 90 Certificate cert; 91 }; 92 93 /** 94 * Private keys and certificates are stored in a hashtable. 95 * Hash entries are keyed by alias names. 96 */ 97 private final Hashtable<String, Object> entries; 98 99 JavaKeyStore() { 100 entries = new Hashtable<String, Object>(); 101 } 102 103 // convert an alias to internal form, overridden in subclasses: 104 // lower case for regular JKS 105 // original string for CaseExactJKS 106 abstract String convertAlias(String alias); 107 108 /** 109 * Returns the key associated with the given alias, using the given 110 * password to recover it. 111 * 112 * @param alias the alias name 113 * @param password the password for recovering the key 114 * 115 * @return the requested key, or null if the given alias does not exist 116 * or does not identify a <i>key entry</i>. 117 * 118 * @exception NoSuchAlgorithmException if the algorithm for recovering the 119 * key cannot be found 120 * @exception UnrecoverableKeyException if the key cannot be recovered 121 * (e.g., the given password is wrong). 122 */ 123 public Key engineGetKey(String alias, char[] password) 124 throws NoSuchAlgorithmException, UnrecoverableKeyException 125 { 126 Object entry = entries.get(convertAlias(alias)); 127 128 if (entry == null || !(entry instanceof KeyEntry)) { 129 return null; 130 } 131 if (password == null) { 132 throw new UnrecoverableKeyException("Password must not be null"); 133 } 134 135 KeyProtector keyProtector = new KeyProtector(password); 136 byte[] encrBytes = ((KeyEntry)entry).protectedPrivKey; 137 EncryptedPrivateKeyInfo encrInfo; 138 byte[] plain; 139 try { 140 encrInfo = new EncryptedPrivateKeyInfo(encrBytes); 141 } catch (IOException ioe) { 142 throw new UnrecoverableKeyException("Private key not stored as " 143 + "PKCS #8 " 144 + "EncryptedPrivateKeyInfo"); 145 } 146 return keyProtector.recover(encrInfo); 147 } 148 149 /** 150 * Returns the certificate chain associated with the given alias. 151 * 152 * @param alias the alias name 153 * 154 * @return the certificate chain (ordered with the user's certificate first 155 * and the root certificate authority last), or null if the given alias 156 * does not exist or does not contain a certificate chain (i.e., the given 157 * alias identifies either a <i>trusted certificate entry</i> or a 158 * <i>key entry</i> without a certificate chain). 159 */ 160 public Certificate[] engineGetCertificateChain(String alias) { 161 Object entry = entries.get(convertAlias(alias)); 162 163 if (entry != null && entry instanceof KeyEntry) { 164 if (((KeyEntry)entry).chain == null) { 165 return null; 166 } else { 167 return ((KeyEntry)entry).chain.clone(); 168 } 169 } else { 170 return null; 171 } 172 } 173 174 /** 175 * Returns the certificate associated with the given alias. 176 * 177 * <p>If the given alias name identifies a 178 * <i>trusted certificate entry</i>, the certificate associated with that 179 * entry is returned. If the given alias name identifies a 180 * <i>key entry</i>, the first element of the certificate chain of that 181 * entry is returned, or null if that entry does not have a certificate 182 * chain. 183 * 184 * @param alias the alias name 185 * 186 * @return the certificate, or null if the given alias does not exist or 187 * does not contain a certificate. 188 */ 189 public Certificate engineGetCertificate(String alias) { 190 Object entry = entries.get(convertAlias(alias)); 191 192 if (entry != null) { 193 if (entry instanceof TrustedCertEntry) { 194 return ((TrustedCertEntry)entry).cert; 195 } else { 196 if (((KeyEntry)entry).chain == null) { 197 return null; 198 } else { 199 return ((KeyEntry)entry).chain[0]; 200 } 201 } 202 } else { 203 return null; 204 } 205 } 206 207 /** 208 * Returns the creation date of the entry identified by the given alias. 209 * 210 * @param alias the alias name 211 * 212 * @return the creation date of this entry, or null if the given alias does 213 * not exist 214 */ 215 public Date engineGetCreationDate(String alias) { 216 Object entry = entries.get(convertAlias(alias)); 217 218 if (entry != null) { 219 if (entry instanceof TrustedCertEntry) { 220 return new Date(((TrustedCertEntry)entry).date.getTime()); 221 } else { 222 return new Date(((KeyEntry)entry).date.getTime()); 223 } 224 } else { 225 return null; 226 } 227 } 228 229 /** 230 * Assigns the given private key to the given alias, protecting 231 * it with the given password as defined in PKCS8. 232 * 233 * <p>The given java.security.PrivateKey <code>key</code> must 234 * be accompanied by a certificate chain certifying the 235 * corresponding public key. 236 * 237 * <p>If the given alias already exists, the keystore information 238 * associated with it is overridden by the given key and certificate 239 * chain. 240 * 241 * @param alias the alias name 242 * @param key the private key to be associated with the alias 243 * @param password the password to protect the key 244 * @param chain the certificate chain for the corresponding public 245 * key (only required if the given key is of type 246 * <code>java.security.PrivateKey</code>). 247 * 248 * @exception KeyStoreException if the given key is not a private key, 249 * cannot be protected, or this operation fails for some other reason 250 */ 251 public void engineSetKeyEntry(String alias, Key key, char[] password, 252 Certificate[] chain) 253 throws KeyStoreException 254 { 255 KeyProtector keyProtector = null; 256 257 if (!(key instanceof java.security.PrivateKey)) { 258 throw new KeyStoreException("Cannot store non-PrivateKeys"); 259 } 260 try { 261 synchronized(entries) { 262 KeyEntry entry = new KeyEntry(); 263 entry.date = new Date(); 264 265 // Protect the encoding of the key 266 keyProtector = new KeyProtector(password); 267 entry.protectedPrivKey = keyProtector.protect(key); 268 269 // clone the chain 270 if ((chain != null) && 271 (chain.length != 0)) { 272 entry.chain = chain.clone(); 273 } else { 274 entry.chain = null; 275 } 276 277 entries.put(convertAlias(alias), entry); 278 } 279 } catch (NoSuchAlgorithmException nsae) { 280 throw new KeyStoreException("Key protection algorithm not found"); 281 } finally { 282 keyProtector = null; 283 } 284 } 285 286 /** 287 * Assigns the given key (that has already been protected) to the given 288 * alias. 289 * 290 * <p>If the protected key is of type 291 * <code>java.security.PrivateKey</code>, it must be accompanied by a 292 * certificate chain certifying the corresponding public key. If the 293 * underlying keystore implementation is of type <code>jks</code>, 294 * <code>key</code> must be encoded as an 295 * <code>EncryptedPrivateKeyInfo</code> as defined in the PKCS #8 standard. 296 * 297 * <p>If the given alias already exists, the keystore information 298 * associated with it is overridden by the given key (and possibly 299 * certificate chain). 300 * 301 * @param alias the alias name 302 * @param key the key (in protected format) to be associated with the alias 303 * @param chain the certificate chain for the corresponding public 304 * key (only useful if the protected key is of type 305 * <code>java.security.PrivateKey</code>). 306 * 307 * @exception KeyStoreException if this operation fails. 308 */ 309 public void engineSetKeyEntry(String alias, byte[] key, 310 Certificate[] chain) 311 throws KeyStoreException 312 { 313 synchronized(entries) { 314 // key must be encoded as EncryptedPrivateKeyInfo as defined in 315 // PKCS#8 316 try { 317 new EncryptedPrivateKeyInfo(key); 318 } catch (IOException ioe) { 319 throw new KeyStoreException("key is not encoded as " 320 + "EncryptedPrivateKeyInfo"); 321 } 322 323 KeyEntry entry = new KeyEntry(); 324 entry.date = new Date(); 325 326 entry.protectedPrivKey = key.clone(); 327 if ((chain != null) && 328 (chain.length != 0)) { 329 entry.chain = chain.clone(); 330 } else { 331 entry.chain = null; 332 } 333 334 entries.put(convertAlias(alias), entry); 335 } 336 } 337 338 /** 339 * Assigns the given certificate to the given alias. 340 * 341 * <p>If the given alias already exists in this keystore and identifies a 342 * <i>trusted certificate entry</i>, the certificate associated with it is 343 * overridden by the given certificate. 344 * 345 * @param alias the alias name 346 * @param cert the certificate 347 * 348 * @exception KeyStoreException if the given alias already exists and does 349 * not identify a <i>trusted certificate entry</i>, or this operation 350 * fails for some other reason. 351 */ 352 public void engineSetCertificateEntry(String alias, Certificate cert) 353 throws KeyStoreException 354 { 355 synchronized(entries) { 356 357 Object entry = entries.get(convertAlias(alias)); 358 if ((entry != null) && (entry instanceof KeyEntry)) { 359 throw new KeyStoreException 360 ("Cannot overwrite own certificate"); 361 } 362 363 TrustedCertEntry trustedCertEntry = new TrustedCertEntry(); 364 trustedCertEntry.cert = cert; 365 trustedCertEntry.date = new Date(); 366 entries.put(convertAlias(alias), trustedCertEntry); 367 } 368 } 369 370 /** 371 * Deletes the entry identified by the given alias from this keystore. 372 * 373 * @param alias the alias name 374 * 375 * @exception KeyStoreException if the entry cannot be removed. 376 */ 377 public void engineDeleteEntry(String alias) 378 throws KeyStoreException 379 { 380 synchronized(entries) { 381 entries.remove(convertAlias(alias)); 382 } 383 } 384 385 /** 386 * Lists all the alias names of this keystore. 387 * 388 * @return enumeration of the alias names 389 */ 390 public Enumeration<String> engineAliases() { 391 return entries.keys(); 392 } 393 394 /** 395 * Checks if the given alias exists in this keystore. 396 * 397 * @param alias the alias name 398 * 399 * @return true if the alias exists, false otherwise 400 */ 401 public boolean engineContainsAlias(String alias) { 402 return entries.containsKey(convertAlias(alias)); 403 } 404 405 /** 406 * Retrieves the number of entries in this keystore. 407 * 408 * @return the number of entries in this keystore 409 */ 410 public int engineSize() { 411 return entries.size(); 412 } 413 414 /** 415 * Returns true if the entry identified by the given alias is a 416 * <i>key entry</i>, and false otherwise. 417 * 418 * @return true if the entry identified by the given alias is a 419 * <i>key entry</i>, false otherwise. 420 */ 421 public boolean engineIsKeyEntry(String alias) { 422 Object entry = entries.get(convertAlias(alias)); 423 if ((entry != null) && (entry instanceof KeyEntry)) { 424 return true; 425 } else { 426 return false; 427 } 428 } 429 430 /** 431 * Returns true if the entry identified by the given alias is a 432 * <i>trusted certificate entry</i>, and false otherwise. 433 * 434 * @return true if the entry identified by the given alias is a 435 * <i>trusted certificate entry</i>, false otherwise. 436 */ 437 public boolean engineIsCertificateEntry(String alias) { 438 Object entry = entries.get(convertAlias(alias)); 439 if ((entry != null) && (entry instanceof TrustedCertEntry)) { 440 return true; 441 } else { 442 return false; 443 } 444 } 445 446 /** 447 * Returns the (alias) name of the first keystore entry whose certificate 448 * matches the given certificate. 449 * 450 * <p>This method attempts to match the given certificate with each 451 * keystore entry. If the entry being considered 452 * is a <i>trusted certificate entry</i>, the given certificate is 453 * compared to that entry's certificate. If the entry being considered is 454 * a <i>key entry</i>, the given certificate is compared to the first 455 * element of that entry's certificate chain (if a chain exists). 456 * 457 * @param cert the certificate to match with. 458 * 459 * @return the (alias) name of the first entry with matching certificate, 460 * or null if no such entry exists in this keystore. 461 */ 462 public String engineGetCertificateAlias(Certificate cert) { 463 Certificate certElem; 464 465 for (Enumeration<String> e = entries.keys(); e.hasMoreElements(); ) { 466 String alias = e.nextElement(); 467 Object entry = entries.get(alias); 468 if (entry instanceof TrustedCertEntry) { 469 certElem = ((TrustedCertEntry)entry).cert; 470 } else if (((KeyEntry)entry).chain != null) { 471 certElem = ((KeyEntry)entry).chain[0]; 472 } else { 473 continue; 474 } 475 if (certElem.equals(cert)) { 476 return alias; 477 } 478 } 479 return null; 480 } 481 482 /** 483 * Stores this keystore to the given output stream, and protects its 484 * integrity with the given password. 485 * 486 * @param stream the output stream to which this keystore is written. 487 * @param password the password to generate the keystore integrity check 488 * 489 * @exception IOException if there was an I/O problem with data 490 * @exception NoSuchAlgorithmException if the appropriate data integrity 491 * algorithm could not be found 492 * @exception CertificateException if any of the certificates included in 493 * the keystore data could not be stored 494 */ 495 public void engineStore(OutputStream stream, char[] password) 496 throws IOException, NoSuchAlgorithmException, CertificateException 497 { 498 synchronized(entries) { 499 /* 500 * KEYSTORE FORMAT: 501 * 502 * Magic number (big-endian integer), 503 * Version of this file format (big-endian integer), 504 * 505 * Count (big-endian integer), 506 * followed by "count" instances of either: 507 * 508 * { 509 * tag=1 (big-endian integer), 510 * alias (UTF string) 511 * timestamp 512 * encrypted private-key info according to PKCS #8 513 * (integer length followed by encoding) 514 * cert chain (integer count, then certs; for each cert, 515 * integer length followed by encoding) 516 * } 517 * 518 * or: 519 * 520 * { 521 * tag=2 (big-endian integer) 522 * alias (UTF string) 523 * timestamp 524 * cert (integer length followed by encoding) 525 * } 526 * 527 * ended by a keyed SHA1 hash (bytes only) of 528 * { password + whitener + preceding body } 529 */ 530 531 // password is mandatory when storing 532 if (password == null) { 533 throw new IllegalArgumentException("password can't be null"); 534 } 535 536 byte[] encoded; // the certificate encoding 537 538 MessageDigest md = getPreKeyedHash(password); 539 DataOutputStream dos 540 = new DataOutputStream(new DigestOutputStream(stream, md)); 541 542 dos.writeInt(MAGIC); 543 // always write the latest version 544 dos.writeInt(VERSION_2); 545 546 dos.writeInt(entries.size()); 547 548 for (Enumeration<String> e = entries.keys(); e.hasMoreElements();) { 549 550 String alias = e.nextElement(); 551 Object entry = entries.get(alias); 552 553 if (entry instanceof KeyEntry) { 554 555 // Store this entry as a KeyEntry 556 dos.writeInt(1); 557 558 // Write the alias 559 dos.writeUTF(alias); 560 561 // Write the (entry creation) date 562 dos.writeLong(((KeyEntry)entry).date.getTime()); 563 564 // Write the protected private key 565 dos.writeInt(((KeyEntry)entry).protectedPrivKey.length); 566 dos.write(((KeyEntry)entry).protectedPrivKey); 567 568 // Write the certificate chain 569 int chainLen; 570 if (((KeyEntry)entry).chain == null) { 571 chainLen = 0; 572 } else { 573 chainLen = ((KeyEntry)entry).chain.length; 574 } 575 dos.writeInt(chainLen); 576 for (int i = 0; i < chainLen; i++) { 577 encoded = ((KeyEntry)entry).chain[i].getEncoded(); 578 dos.writeUTF(((KeyEntry)entry).chain[i].getType()); 579 dos.writeInt(encoded.length); 580 dos.write(encoded); 581 } 582 } else { 583 584 // Store this entry as a certificate 585 dos.writeInt(2); 586 587 // Write the alias 588 dos.writeUTF(alias); 589 590 // Write the (entry creation) date 591 dos.writeLong(((TrustedCertEntry)entry).date.getTime()); 592 593 // Write the trusted certificate 594 encoded = ((TrustedCertEntry)entry).cert.getEncoded(); 595 dos.writeUTF(((TrustedCertEntry)entry).cert.getType()); 596 dos.writeInt(encoded.length); 597 dos.write(encoded); 598 } 599 } 600 601 /* 602 * Write the keyed hash which is used to detect tampering with 603 * the keystore (such as deleting or modifying key or 604 * certificate entries). 605 */ 606 byte digest[] = md.digest(); 607 608 dos.write(digest); 609 dos.flush(); 610 } 611 } 612 613 /** 614 * Loads the keystore from the given input stream. 615 * 616 * <p>If a password is given, it is used to check the integrity of the 617 * keystore data. Otherwise, the integrity of the keystore is not checked. 618 * 619 * @param stream the input stream from which the keystore is loaded 620 * @param password the (optional) password used to check the integrity of 621 * the keystore. 622 * 623 * @exception IOException if there is an I/O or format problem with the 624 * keystore data 625 * @exception NoSuchAlgorithmException if the algorithm used to check 626 * the integrity of the keystore cannot be found 627 * @exception CertificateException if any of the certificates in the 628 * keystore could not be loaded 629 */ 630 public void engineLoad(InputStream stream, char[] password) 631 throws IOException, NoSuchAlgorithmException, CertificateException 632 { 633 synchronized(entries) { 634 DataInputStream dis; 635 MessageDigest md = null; 636 CertificateFactory cf = null; 637 Hashtable<String, CertificateFactory> cfs = null; 638 ByteArrayInputStream bais = null; 639 byte[] encoded = null; 640 641 if (stream == null) 642 return; 643 644 if (password != null) { 645 md = getPreKeyedHash(password); 646 dis = new DataInputStream(new DigestInputStream(stream, md)); 647 } else { 648 dis = new DataInputStream(stream); 649 } 650 651 // Body format: see store method 652 653 int xMagic = dis.readInt(); 654 int xVersion = dis.readInt(); 655 656 if (xMagic!=MAGIC || 657 (xVersion!=VERSION_1 && xVersion!=VERSION_2)) { 658 throw new IOException("Invalid keystore format"); 659 } 660 661 if (xVersion == VERSION_1) { 662 cf = CertificateFactory.getInstance("X509"); 663 } else { 664 // version 2 665 cfs = new Hashtable<String, CertificateFactory>(3); 666 } 667 668 entries.clear(); 669 int count = dis.readInt(); 670 671 for (int i = 0; i < count; i++) { 672 int tag; 673 String alias; 674 675 tag = dis.readInt(); 676 677 if (tag == 1) { // private key entry 678 679 KeyEntry entry = new KeyEntry(); 680 681 // Read the alias 682 alias = dis.readUTF(); 683 684 // Read the (entry creation) date 685 entry.date = new Date(dis.readLong()); 686 687 // Read the private key 688 entry.protectedPrivKey = 689 IOUtils.readFully(dis, dis.readInt(), true); 690 691 // Read the certificate chain 692 int numOfCerts = dis.readInt(); 693 if (numOfCerts > 0) { 694 List<Certificate> certs = new ArrayList<>( 695 numOfCerts > 10 ? 10 : numOfCerts); 696 for (int j = 0; j < numOfCerts; j++) { 697 if (xVersion == 2) { 698 // read the certificate type, and instantiate a 699 // certificate factory of that type (reuse 700 // existing factory if possible) 701 String certType = dis.readUTF(); 702 if (cfs.containsKey(certType)) { 703 // reuse certificate factory 704 cf = cfs.get(certType); 705 } else { 706 // create new certificate factory 707 cf = CertificateFactory.getInstance(certType); 708 // store the certificate factory so we can 709 // reuse it later 710 cfs.put(certType, cf); 711 } 712 } 713 // instantiate the certificate 714 encoded = IOUtils.readFully(dis, dis.readInt(), true); 715 bais = new ByteArrayInputStream(encoded); 716 certs.add(cf.generateCertificate(bais)); 717 bais.close(); 718 } 719 // We can be sure now that numOfCerts of certs are read 720 entry.chain = certs.toArray(new Certificate[numOfCerts]); 721 } 722 723 // Add the entry to the list 724 entries.put(alias, entry); 725 726 } else if (tag == 2) { // trusted certificate entry 727 728 TrustedCertEntry entry = new TrustedCertEntry(); 729 730 // Read the alias 731 alias = dis.readUTF(); 732 733 // Read the (entry creation) date 734 entry.date = new Date(dis.readLong()); 735 736 // Read the trusted certificate 737 if (xVersion == 2) { 738 // read the certificate type, and instantiate a 739 // certificate factory of that type (reuse 740 // existing factory if possible) 741 String certType = dis.readUTF(); 742 if (cfs.containsKey(certType)) { 743 // reuse certificate factory 744 cf = cfs.get(certType); 745 } else { 746 // create new certificate factory 747 cf = CertificateFactory.getInstance(certType); 748 // store the certificate factory so we can 749 // reuse it later 750 cfs.put(certType, cf); 751 } 752 } 753 encoded = IOUtils.readFully(dis, dis.readInt(), true); 754 bais = new ByteArrayInputStream(encoded); 755 entry.cert = cf.generateCertificate(bais); 756 bais.close(); 757 758 // Add the entry to the list 759 entries.put(alias, entry); 760 761 } else { 762 throw new IOException("Unrecognized keystore entry"); 763 } 764 } 765 766 /* 767 * If a password has been provided, we check the keyed digest 768 * at the end. If this check fails, the store has been tampered 769 * with 770 */ 771 if (password != null) { 772 byte computed[], actual[]; 773 computed = md.digest(); 774 actual = new byte[computed.length]; 775 dis.readFully(actual); 776 for (int i = 0; i < computed.length; i++) { 777 if (computed[i] != actual[i]) { 778 Throwable t = new UnrecoverableKeyException 779 ("Password verification failed"); 780 throw (IOException)new IOException 781 ("Keystore was tampered with, or " 782 + "password was incorrect").initCause(t); 783 } 784 } 785 } 786 } 787 } 788 789 /** 790 * To guard against tampering with the keystore, we append a keyed 791 * hash with a bit of whitener. 792 */ 793 private MessageDigest getPreKeyedHash(char[] password) 794 throws NoSuchAlgorithmException, UnsupportedEncodingException 795 { 796 int i, j; 797 798 MessageDigest md = MessageDigest.getInstance("SHA"); 799 byte[] passwdBytes = new byte[password.length * 2]; 800 for (i=0, j=0; i<password.length; i++) { 801 passwdBytes[j++] = (byte)(password[i] >> 8); 802 passwdBytes[j++] = (byte)password[i]; 803 } 804 md.update(passwdBytes); 805 for (i=0; i<passwdBytes.length; i++) 806 passwdBytes[i] = 0; 807 md.update("Mighty Aphrodite".getBytes("UTF8")); 808 return md; 809 } 810 }