从PHP生成Chrome .crx

Question

我想从PHP生成Chrome扩展程序(Chrome主题).我的PHP脚本生成一个zip文件(download.zip).要将其转换为.crx包,需要添加标头,包括公钥和签名.

我看到了这个答案,但你需要一个生成.pub文件的.pem文件.我在共享主机上,因此exec()将无法工作(将.pem转换为.pub).不需要.pem文件,只需在下载后使用它(无需更新).

然后我看到这条评论说明你可以生成私钥和公钥.组合这两个脚本将不起作用(请参阅代码).

如何生成密钥对并使用它来签署带有PHP的chrome .crx包？

此代码失败(CRX_SIGNATURE_VERIFICATION_INITALIZATION_FAILED):

// Create the keypair
$res=openssl_pkey_new();

// Get private key
openssl_pkey_export($res, $pk);

// Get public key
$key=openssl_pkey_get_details($res);
$key=$key["key"];

# make a SHA1 signature using our private key
openssl_sign(file_get_contents('download.zip'), $signature, $pk, 'sha1');

# decode the public key
$key = base64_decode($key);

# .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('download.zip')); // package contents, zipped
fclose($fh);

Answer 1

你用openssl_pkey_export错了而且还没有删除

-----BEGIN PUBLIC KEY-----
...
-----END PUBLIC KEY-----

在解码之前从公钥字符串中获取。我通过查看公钥和签名的长度发现了这一点。第一个应该是 161，第二个应该是 128 字节长（来源）：

A2 00 00 00   # 162 -- length of public key in bytes
80 00 00 00   # 128 -- length of signature in bytes

这是固定代码（PHP 5.4）：

$pk=file_get_contents('pk.pem');

$priv = openssl_pkey_get_private($pk);
$pub = openssl_pkey_get_details($priv)['key'];

# make a SHA1 signature using our private key
openssl_sign(file_get_contents('download.zip'), $signature, $priv, OPENSSL_ALGO_SHA1);

# geting rid of -----BEGIN/END PUBLIC KEY-----
# you can probably do it better using preg_match_all / explode(PHP_EOL, $pub) etc.
$pub = trim(explode('-----',$pub)[2]);

# decode the public key
$pub = base64_decode($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($pub)));            // public key length
fwrite($fh, pack('V', strlen($signature)));      // signature length
fwrite($fh, $pub);                               // public key
fwrite($fh, $signature);                         // signature
fwrite($fh, file_get_contents('download.zip')); // package contents, zipped
fclose($fh);