从PHP生成Chrome .crx

Question

我想从PHP生成一个Chrome扩展(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，它需要添加头部，包括公钥和签名。

我看到了这的答案，但您需要一个生成.pub文件的.pem文件。我在共享主机上，所以exec()不能工作(将.pem转换为.pub)。没有必要有一个.pem文件，它只需要下载一次就可以使用它(不需要更新)。

然后，我看到了这评论，说明您可以生成私钥和公钥。组合这两个脚本是行不通的(请参阅代码)。

我如何生成一个键盘并使用它来用PHP签署一个铬.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

你用错了openssl_pkey_export而且你还没有删除

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

在解码前从公钥字符串中删除。我通过查看公钥和签名的长度就知道了这一点。第一个应该是161个，第二个应该是128个字节长(来源)：

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

以下是固定代码(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);