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    <p>This <a href="https://github.com/Constellation/crxmake/blob/master/lib/crxmake.rb" rel="nofollow">ruby code</a> was helpful.</p> <p>Your public key must be in DER format, and unfortunately PHP's OpenSSL extension can't do that, so far as I can tell. I had to generate it from my private key at the command line:</p> <pre><code>openssl rsa -pubout -outform DER &lt; extension_private_key.pem &gt; extension_public_key.pub </code></pre> <p><strong>UPDATE</strong>: there is a PHP der2pem() function <a href="http://www.php.net/manual/en/ref.openssl.php#74188" rel="nofollow">available here</a>, thanks to tutuDajuju for pointing it out.</p> <p>Once that's done, building the .crx file is quite easy:</p> <pre><code># make a SHA1 signature using our private key $pk = openssl_pkey_get_private(file_get_contents('extension_private_key.pem')); openssl_sign(file_get_contents('extension.zip'), $signature, $pk, 'sha1'); openssl_free_key($pk); # decode the public key $key = base64_decode(file_get_contents('extension_public_key.pub')); # .crx package format: # # magic number char(4) # crx format ver byte(4) # pub key lenth byte(4) # signature length byte(4) # public key string # signature string # package contents, zipped string # # see http://code.google.com/chrome/extensions/crx.html # $fh = fopen('extension.crx', 'wb'); fwrite($fh, 'Cr24'); // extension file magic number fwrite($fh, pack('V', 2)); // crx format version fwrite($fh, pack('V', strlen($key))); // public key length fwrite($fh, pack('V', strlen($signature))); // signature length fwrite($fh, $key); // public key fwrite($fh, $signature); // signature fwrite($fh, file_get_contents('extension.zip')); // package contents, zipped fclose($fh); </code></pre>
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    1. POCreate Google Chrome Crx file with PHP
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    1. COThanks for your input but that's pretty much what I can do allready. This will sign a zip just fine, but as I stated above all the extensions will have the same extension ID which is far from ideal. Thanks tho.
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    2. COAre you sure that's a bad thing? Notice in the manifest file, updates are checked using that very ID. If the ID changed with each build, Chrome would never see any updates to your extension. See http://code.google.com/chrome/extensions/autoupdate.html
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    3. COsince PHP's Open SSL functions use the .pem format, you can use a function to convert from .pem to .der format or visa versa. See: http://www.php.net/manual/en/ref.openssl.php#74188. You could also, create a new key on every creation if you wish and then get unique id's. Then, save the keys, get hash of the public key (this should be the ID) and store both to create a dynamic system of creation and update.
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