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| 187 <div id="pageTitle"> | |
| 188 <h1 class="page_title">CRX Package Format</h1> | |
| 189 </div> | |
| 190 <!-- TABLE OF CONTENTS --> | |
| 191 <div id="toc"> | |
| 192 <h2>Contents</h2> | |
| 193 <ol> | |
| 194 <li> | |
| 195 <a href="#H2-0">Package header</a> | |
| 196 <ol> | |
| 197 </ol> | |
| 198 </li><li> | |
| 199 <a href="#H2-1">Extension contents</a> | |
| 200 <ol> | |
| 201 </ol> | |
| 202 </li><li> | |
| 203 <a href="#H2-2">Example</a> | |
| 204 <ol> | |
| 205 </ol> | |
| 206 </li><li> | |
| 207 <a href="#scripts">Packaging scripts</a> | |
| 208 <ol> | |
| 209 <li> | |
| 210 <a href="#ruby">Ruby</a> | |
| 211 </li><li> | |
| 212 <a href="#H3-5">Bash</a> | |
| 213 </li> | |
| 214 </ol> | |
| 215 </li> | |
| 216 </ol> | |
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| 218 <!-- /TABLE OF CONTENTS --> | |
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| 220 <!-- STATIC CONTENT PLACEHOLDER --> | |
| 221 <div id="static"><div id="pageData-name" class="pageData">CRX Package Fo
rmat</div> | |
| 222 <div id="pageData-showTOC" class="pageData">true</div> | |
| 223 <p> | |
| 224 CRX files are ZIP files with a special header and the <code>.crx</code> file | |
| 225 extension. | |
| 226 </p> | |
| 227 <a name="H2-0"></a><h2>Package header</h2> | |
| 228 <p> | |
| 229 The header contains the author's public key and the extension's signature. | |
| 230 The signature is generated from the ZIP file using SHA-1 with the | |
| 231 author's private key. The header requires a little-endian byte ordering with | |
| 232 4-byte alignment. The following table describes the fields of | |
| 233 the <code>.crx</code> header in order: | |
| 234 </p> | |
| 235 <table> | |
| 236 <tbody><tr> | |
| 237 <th>Field</th><th>Type</th><th>Length</th><th>Value</th><th>Description</th> | |
| 238 </tr> | |
| 239 <tr> | |
| 240 <td><em>magic number</em></td><td>char[]</td><td>32 bits</td><td>Cr24</td> | |
| 241 <td> | |
| 242 Chrome requires this constant at the beginning of every <code>.crx</code> | |
| 243 package. | |
| 244 </td> | |
| 245 </tr> | |
| 246 <tr> | |
| 247 <td><em>version</em></td><td>unsigned int</td><td>32 bits</td><td>2</td
> | |
| 248 <td>The version of the <code>*.crx</code> file format used (currently 2).</t
d> | |
| 249 </tr> | |
| 250 <tr> | |
| 251 <td><em>public key length</em></td><td>unsigned int</td><td>32 bits</td
> | |
| 252 <td><i>pubkey.length</i></td> | |
| 253 <td> | |
| 254 The length of the RSA public key in <em>bytes</em>. | |
| 255 </td> | |
| 256 </tr> | |
| 257 <tr> | |
| 258 <td><em>signature length</em></td><td>unsigned int</td><td>32 bits</td> | |
| 259 <td><i>sig.length</i></td> | |
| 260 <td> | |
| 261 The length of the signature in <em>bytes</em>. | |
| 262 </td> | |
| 263 </tr> | |
| 264 <tr> | |
| 265 <td><em>public key</em></td><td>byte[]</td><td><i>pubkey.length</i></td> | |
| 266 <td><i>pubkey.contents</i></td> | |
| 267 <td> | |
| 268 The contents of the author's RSA public key, formatted as an X509 | |
| 269 SubjectPublicKeyInfo block. | |
| 270 </td> | |
| 271 </tr> | |
| 272 <tr> | |
| 273 <td><em>signature</em></td><td>byte[]</td><td><i>sig.length</i></td> | |
| 274 <td><i>sig.contents</i></td> | |
| 275 <td> | |
| 276 The signature of the ZIP content using the author's private key. The | |
| 277 signature is created using the RSA algorithm with the SHA-1 hash function. | |
| 278 </td> | |
| 279 </tr> | |
| 280 </tbody></table> | |
| 281 <a name="H2-1"></a><h2>Extension contents</h2> | |
| 282 <p> | |
| 283 The extension's ZIP file is appended to the <code>*.crx</code> package after the | |
| 284 header. This should be the same ZIP file that the signature in the header | |
| 285 was generated from. | |
| 286 </p> | |
| 287 <a name="H2-2"></a><h2>Example</h2> | |
| 288 <p> | |
| 289 The following is an example hex dump from the beginning of a <code>.crx</code> | |
| 290 file. | |
| 291 </p> | |
| 292 <pre>43 72 32 34 # "Cr24" -- the magic number | |
| 293 02 00 00 00 # 2 -- the crx format version number | |
| 294 A2 00 00 00 # 162 -- length of public key in bytes | |
| 295 80 00 00 00 # 128 -- length of signature in bytes | |
| 296 ........... # the contents of the public key | |
| 297 ........... # the contents of the signature | |
| 298 ........... # the contents of the zip file | |
| 299 </pre> | |
| 300 <h2 id="scripts">Packaging scripts</h2> | |
| 301 <p> | |
| 302 Members of the community have written the following scripts to package | |
| 303 <code>.crx</code> files. | |
| 304 </p> | |
| 305 <h3 id="ruby">Ruby</h3> | |
| 306 <blockquote> | |
| 307 <a href="http://github.com/Constellation/crxmake">github: crxmake</a> | |
| 308 </blockquote> | |
| 309 <a name="H3-5"></a><h3>Bash</h3> | |
| 310 <pre>#!/bin/bash -e | |
| 311 # | |
| 312 # Purpose: Pack a Chromium extension directory into crx format | |
| 313 if test $# -ne 2; then | |
| 314 echo "Usage: crxmake.sh <extension dir> <pem path>" | |
| 315 exit 1 | |
| 316 fi | |
| 317 dir=$1 | |
| 318 key=$2 | |
| 319 name=$(basename "$dir") | |
| 320 crx="$name.crx" | |
| 321 pub="$name.pub" | |
| 322 sig="$name.sig" | |
| 323 zip="$name.zip" | |
| 324 trap 'rm -f "$pub" "$sig" "$zip"' EXIT | |
| 325 # zip up the crx dir | |
| 326 cwd=$(pwd -P) | |
| 327 (cd "$dir" && zip -qr -9 -X "$cwd/$zip" .) | |
| 328 # signature | |
| 329 openssl sha1 -sha1 -binary -sign "$key" < "$zip" > "$sig" | |
| 330 # public key | |
| 331 openssl rsa -pubout -outform DER < "$key" > "$pub" 2>/dev/null | |
| 332 byte_swap () { | |
| 333 # Take "abcdefgh" and return it as "ghefcdab" | |
| 334 echo "${1:6:2}${1:4:2}${1:2:2}${1:0:2}" | |
| 335 } | |
| 336 crmagic_hex="4372 3234" # Cr24 | |
| 337 version_hex="0200 0000" # 2 | |
| 338 pub_len_hex=$(byte_swap $(printf '%08x\n' $(ls -l "$pub" | awk '{print $5}'))) | |
| 339 sig_len_hex=$(byte_swap $(printf '%08x\n' $(ls -l "$sig" | awk '{print $5}'))) | |
| 340 ( | |
| 341 echo "$crmagic_hex $version_hex $pub_len_hex $sig_len_hex" | xxd -r -p | |
| 342 cat "$pub" "$sig" "$zip" | |
| 343 ) > "$crx" | |
| 344 echo "Wrote $crx" | |
| 345 </pre> | |
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