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250 </script> 251 252 <div class="g-unit" id="gc-pagecontent"> 253 <div id="pageTitle"> 254 <h1 class="page_title">CRX Package Format</h1> 255 </div> 256 <!-- TABLE OF CONTENTS --> 257 <div id="toc"> 258 <h2>Contents</h2> 259 <ol> 260 <li> 261 <a href="#H2-0">Package header</a> 262 <ol> 263 <li style="display: none; "> 264 <a>h3Name</a> 265 </li> 266 </ol> 267 </li><li> 268 <a href="#H2-1">Extension contents</a> 269 <ol> 270 <li style="display: none; "> 271 <a>h3Name</a> 272 </li> 273 </ol> 274 </li><li> 275 <a href="#H2-2">Example</a> 276 <ol> 277 <li style="display: none; "> 278 <a>h3Name</a> 279 </li> 280 </ol> 281 </li><li> 282 <a href="#scripts">Packaging scripts</a> 283 <ol> 284 <li> 285 <a href="#ruby">Ruby</a> 286 </li><li> 287 <a href="#H3-5">Bash</a> 288 </li> 289 </ol> 290 </li> 291 <li style="display: none; "> 292 <a href="#apiReference">API reference</a> 293 <ol> 294 <li> 295 <a href="#properties">Properties</a> 296 <ol> 297 <li> 298 <a href="#property-anchor">propertyName</a> 299 </li> 300 </ol> 301 </li> 302 <li> 303 <a>Methods</a> 304 <ol> 305 <li> 306 <a href="#method-anchor">methodName</a> 307 </li> 308 </ol> 309 </li> 310 <li> 311 <a>Events</a> 312 <ol> 313 <li> 314 <a href="#event-anchor">eventName</a> 315 </li> 316 </ol> 317 </li> 318 <li> 319 <a href="#types">Types</a> 320 <ol> 321 <li> 322 <a href="#id-anchor">id</a> 323 </li> 324 </ol> 325 </li> 326 </ol> 327 </li> 328 </ol> 329 </div> 330 <!-- /TABLE OF CONTENTS --> 331 332 <!-- Standard content lead-in for experimental API pages --> 333 <p id="classSummary" style="display: none; "> 334 For information on how to use experimental APIs, see the <a href="experimental.html">chrome.experimental.* APIs</a> page. 335 </p> 336 337 <!-- STATIC CONTENT PLACEHOLDER --> 338 <div id="static"><div id="pageData-name" class="pageData">CRX Package Format</div> 339<div id="pageData-showTOC" class="pageData">true</div> 340 341<p> 342CRX files are ZIP files with a special header and the <code>.crx</code> file 343extension. 344</p> 345 346<a name="H2-0"></a><h2>Package header</h2> 347 348<p> 349The header contains the author's public key and the extension's signature. 350The signature is generated from the ZIP file using SHA-1 with the 351author's private key. The header requires a little-endian byte ordering with 3524-byte alignment. The following table describes the fields of 353the <code>.crx</code> header in order: 354</p> 355 356<table> 357 <tbody><tr> 358 <th>Field</th><th>Type</th><th>Length</th><th>Value</th><th>Description</th> 359 </tr> 360 <tr> 361 <td><em>magic number</em></td><td>char[]</td><td>32 bits</td><td>Cr24</td> 362 <td> 363 Chrome requires this constant at the beginning of every <code>.crx</code> 364 package. 365 </td> 366 </tr> 367 <tr> 368 <td><em>version</em></td><td>unsigned int</td><td>32 bits</td><td>2</td> 369 <td>The version of the <code>*.crx</code> file format used (currently 2).</td> 370 </tr> 371 <tr> 372 <td><em>public key length</em></td><td>unsigned int</td><td>32 bits</td> 373 <td><i>pubkey.length</i></td> 374 <td> 375 The length of the RSA public key in <em>bytes</em>. 376 </td> 377 </tr> 378 <tr> 379 <td><em>signature length</em></td><td>unsigned int</td><td>32 bits</td> 380 <td><i>sig.length</i></td> 381 <td> 382 The length of the signature in <em>bytes</em>. 383 </td> 384 </tr> 385 <tr> 386 <td><em>public key</em></td><td>byte[]</td><td><i>pubkey.length</i></td> 387 <td><i>pubkey.contents</i></td> 388 <td> 389 The contents of the author's RSA public key, formatted as an X509 390 SubjectPublicKeyInfo block. 391 </td> 392 </tr> 393 <tr> 394 <td><em>signature</em></td><td>byte[]</td><td><i>sig.length</i></td> 395 <td><i>sig.contents</i></td> 396 <td> 397 The signature of the ZIP content using the author's private key. The 398 signature is created using the RSA algorithm with the SHA-1 hash function. 399 </td> 400 </tr> 401</tbody></table> 402 403<a name="H2-1"></a><h2>Extension contents</h2> 404 405<p> 406The extension's ZIP file is appended to the <code>*.crx</code> package after the 407header. This should be the same ZIP file that the signature in the header 408was generated from. 409</p> 410 411<a name="H2-2"></a><h2>Example</h2> 412 413<p> 414The following is an example hex dump from the beginning of a <code>.crx</code> 415file. 416</p> 417 418<pre>43 72 32 34 # "Cr24" -- the magic number 41902 00 00 00 # 2 -- the crx format version number 420A2 00 00 00 # 162 -- length of public key in bytes 42180 00 00 00 # 128 -- length of signature in bytes 422........... # the contents of the public key 423........... # the contents of the signature 424........... # the contents of the zip file 425 426</pre> 427 428<h2 id="scripts">Packaging scripts</h2> 429<p> 430Members of the community have written the following scripts to package 431<code>.crx</code> files. 432</p> 433 434<h3 id="ruby">Ruby</h3> 435<blockquote> 436<a href="http://github.com/Constellation/crxmake">github: crxmake</a> 437</blockquote> 438 439<a name="H3-5"></a><h3>Bash</h3> 440<pre>#!/bin/bash -e 441# 442# Purpose: Pack a Chromium extension directory into crx format 443 444if test $# -ne 2; then 445 echo "Usage: crxmake.sh <extension dir> <pem path>" 446 exit 1 447fi 448 449dir=$1 450key=$2 451name=$(basename "$dir") 452crx="$name.crx" 453pub="$name.pub" 454sig="$name.sig" 455zip="$name.zip" 456trap 'rm -f "$pub" "$sig" "$zip"' EXIT 457 458# zip up the crx dir 459cwd=$(pwd -P) 460(cd "$dir" && zip -qr -9 -X "$cwd/$zip" .) 461 462# signature 463openssl sha1 -sha1 -binary -sign "$key" < "$zip" > "$sig" 464 465# public key 466openssl rsa -pubout -outform DER < "$key" > "$pub" 2>/dev/null 467 468byte_swap () { 469 # Take "abcdefgh" and return it as "ghefcdab" 470 echo "${1:6:2}${1:4:2}${1:2:2}${1:0:2}" 471} 472 473crmagic_hex="4372 3234" # Cr24 474version_hex="0200 0000" # 2 475pub_len_hex=$(byte_swap $(printf '%08x\n' $(ls -l "$pub" | awk '{print $5}'))) 476sig_len_hex=$(byte_swap $(printf '%08x\n' $(ls -l "$sig" | awk '{print $5}'))) 477( 478 echo "$crmagic_hex $version_hex $pub_len_hex $sig_len_hex" | xxd -r -p 479 cat "$pub" "$sig" "$zip" 480) > "$crx" 481echo "Wrote $crx" 482</pre> 483 484</div> 485 486 <!-- API PAGE --> 487 <div class="apiPage" style="display: none; "> 488 <a name="apiReference"></a> 489 <h2>API reference: chrome.apiname </h2> 490 491 <!-- PROPERTIES --> 492 <div class="apiGroup"> 493 <a name="properties"></a> 494 <h3 id="properties">Properties</h3> 495 496 <div> 497 <a></a> 498 <h4>getLastError</h4> 499 <div class="summary"> 500 <!-- Note: intentionally longer 80 columns --> 501 <span>chrome.extension</span><span>lastError</span> 502 </div> 503 <div> 504 </div> 505 </div> 506 507 </div> <!-- /apiGroup --> 508 509 <!-- METHODS --> 510 <div id="methodsTemplate" class="apiGroup"> 511 <a></a> 512 <h3>Methods</h3> 513 514 <!-- iterates over all functions --> 515 <div class="apiItem"> 516 <a></a> <!-- method-anchor --> 517 <h4>method name</h4> 518 519 <div class="summary"><span>void</span> 520 <!-- Note: intentionally longer 80 columns --> 521 <span>chrome.module.methodName</span>(<span><span>, </span><span></span> 522 <var><span></span></var></span>)</div> 523 524 <div class="description"> 525 <p class="todo">Undocumented.</p> 526 <p> 527 A description from the json schema def of the function goes here. 528 </p> 529 530 <!-- PARAMETERS --> 531 <h4>Parameters</h4> 532 <dl> 533 <div> 534 <div> 535 </div> 536 </div> 537 </dl> 538 539 <!-- RETURNS --> 540 <h4>Returns</h4> 541 <dl> 542 <div> 543 <div> 544 </div> 545 </div> 546 </dl> 547 548 <!-- CALLBACK --> 549 <div> 550 <div> 551 <h4>Callback function</h4> 552 <p> 553 The callback <em>parameter</em> should specify a function 554 that looks like this: 555 </p> 556 <p> 557 If you specify the <em>callback</em> parameter, it should 558 specify a function that looks like this: 559 </p> 560 561 <!-- Note: intentionally longer 80 columns --> 562 <pre>function(<span>Type param1, Type param2</span>) <span class="subdued">{...}</span>;</pre> 563 <dl> 564 <div> 565 <div> 566 </div> 567 </div> 568 </dl> 569 </div> 570 </div> 571 572 <!-- MIN_VERSION --> 573 <p> 574 This function was added in version <b><span></span></b>. 575 If you require this function, the manifest key 576 <a href="manifest.html#minimum_chrome_version">minimum_chrome_version</a> 577 can ensure that your extension won't be run in an earlier browser version. 578 </p> 579 </div> <!-- /description --> 580 581 </div> <!-- /apiItem --> 582 583 </div> <!-- /apiGroup --> 584 585 <!-- EVENTS --> 586 <div id="eventsTemplate" class="apiGroup"> 587 <a></a> 588 <h3>Events</h3> 589 <!-- iterates over all events --> 590 <div class="apiItem"> 591 <a></a> 592 <h4>event name</h4> 593 594 <div class="summary"> 595 <!-- Note: intentionally longer 80 columns --> 596 <span class="subdued">chrome.bookmarks</span><span>onEvent</span><span class="subdued">.addListener</span>(function(<span>Type param1, Type param2</span>) <span class="subdued">{...}</span>); 597 </div> 598 599 <div class="description"> 600 <p class="todo">Undocumented.</p> 601 <p> 602 A description from the json schema def of the event goes here. 603 </p> 604 605 <!-- PARAMETERS --> 606 <div> 607 <h4>Parameters</h4> 608 <dl> 609 <div> 610 <div> 611 </div> 612 </div> 613 </dl> 614 </div> 615 </div> <!-- /decription --> 616 617 </div> <!-- /apiItem --> 618 619 </div> <!-- /apiGroup --> 620 621 <!-- TYPES --> 622 <div class="apiGroup"> 623 <a name="types"></a> 624 <h3 id="types">Types</h3> 625 626 <!-- iterates over all types --> 627 <div class="apiItem"> 628 <a></a> 629 <h4>type name</h4> 630 631 <div> 632 </div> 633 634 </div> <!-- /apiItem --> 635 636 </div> <!-- /apiGroup --> 637 638 </div> <!-- /apiPage --> 639 </div> <!-- /gc-pagecontent --> 640 </div> <!-- /g-section --> 641 </div> <!-- /codesiteContent --> 642 <div id="gc-footer" --=""> 643 <div class="text"> 644 <p> 645 Except as otherwise <a href="http://code.google.com/policies.html#restrictions">noted</a>, 646 the content of this page is licensed under the <a rel="license" href="http://creativecommons.org/licenses/by/3.0/">Creative Commons 647 Attribution 3.0 License</a>, and code samples are licensed under the 648 <a rel="license" href="http://code.google.com/google_bsd_license.html">BSD License</a>. 649 </p> 650 <p> 651 ©2011 Google 652 </p> 653 654<!-- begin analytics --> 655<script src="http://www.google-analytics.com/urchin.js" type="text/javascript"></script> 656<script src="http://www.google-analytics.com/ga.js" type="text/javascript"></script> 657 658<script type="text/javascript"> 659 // chrome doc tracking 660 try { 661 var engdocs = _gat._getTracker("YT-10763712-2"); 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