如何以编程方式计算Chrome扩展程序ID？ [英] How to programmatically calculate Chrome extension ID?

问题描述

我正在构建一个自动化过程来生成扩展。是否有代码示例直接计算扩展ID并完全绕过与浏览器的交互？

（我正在回答我自己的问题，下面。）

解决方案

我只能找到一个带有Ruby片段的相关文章，并且仅在IA中可用： http://web.archive.org/web/20120606044635/http://supercollider.dk/2010/01/calculating-chrome-extension-id-from-your-private-key-233

重要提示：

1. 这取决于DER编码的公钥（原始二进制），而不是PEM编码的密钥（由base64编码DER密钥生成的漂亮ASCII）。
   
2. 扩展ID为基数为16，但使用[ap]编码mpdecimal），而不是[0-9a-f]。

使用PEM编码公共密钥，请按照以下步骤操作：

1. 如果您的PEM格式的公共密钥仍具有页眉和页脚并被分成多行，手动重新格式化它，以便您有一个排除页眉和页脚的单个字符串，并且一起运行，以使每一行的密钥都包含到下一个。


2. Base64解码使用DER格式的公钥生成公钥。


3. 生成DER格式化密钥的SHA256十六进制摘要。前32个字节的散列。您将不需要其余的。


4. 对于每个字符，将其转换为base-10，并为a添加ASCII代码。 >
   
   

   以下是执行此操作的Python例程：
   
   

     import hashlib 
    from base64 import b64decode 
    
    def build_id（pub_key_pem）：
    pub_key_der = b64decode（pub_key_pem）
    sha = hashlib.sha256（pub_key_der）.hexdigest（）
   前缀= sha [：32] 
    
    reencoded =
    ord_a = ord（'a'）
   前缀中的old_char：
    code = int（old_char， 16）
    new_char = chr（ord_a + code）
    
    reencoded + = new_char 
    
   返回重新编码
    
    def main（）：
    pub_key = 'MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCjvF5pjuK8gRaw / 2LoRYi37QqRd48B / FeO9yFtT6ueY84z / u0NrJ / xbPFc9OCGBi8RKIblVvcbY0ySGqdmp0QsUr / oXN0b06GL4iB8rMhlO082HhMzrClV8OKRJ + eJNhNBl8viwmtJs3MN0x9ljA4HQLaAPBA9a14IUKLjP0pWuwIDAQAB' 
    
    ID_ = build_id（pub_key）
    PR int（id_）
    
    if __name__ =='__main__'：
    main（）
     

   欢迎您对现有扩展程序及其ID进行测试。检索其PEM格式的公钥：
   
   

   
   
   1. 进入Chrome中现有扩展的列表。获取其中一个的扩展名。
   
   
   2. 查找托管扩展的目录。在我的Windows 7盒子上，它是：C：\ Users \\AppData\Local\Google\Chrome\User Data\Default\Extensions\
   
   
   3. 从key下的manifest.json文件中获取公钥。由于密钥已经准备好进行base64解码，所以您可以跳过该流程的步骤（1）。
      

   公钥在这个例子中来自Chrome Reader扩展。它的扩展ID是lojpenhmoajbiciapkjkiekmobleogjc。
   
   

   另见：
   
   

   
   
   1. 谷歌浏览器 - 使用字母数字哈希来标识扩展名
   
   
   2. http：//blog.roomanna .com / 12-14-2010 / getting-an-extensions-id
   
   

   
   

   I'm building an automated process to produce extensions. Is there a code example of calculating the extension-ID directly and entirely bypassing interaction with the browser?

   (I'm answering my own question, below.)

   解决方案

   I was only able to find a related article with a Ruby fragment, and it's only available in the IA: http://web.archive.org/web/20120606044635/http://supercollider.dk/2010/01/calculating-chrome-extension-id-from-your-private-key-233

   Important to know:

   1. This depends on a DER-encoded public key (raw binary), not a PEM-encoded key (nice ASCII generated by base64-encoding the DER key).
   2. The extension-IDs are base-16, but are encoded using [a-p] (called "mpdecimal"), rather than [0-9a-f].

   Using a PEM-encoded public key, follow the following steps:

   1. If your PEM-formatted public-key still has the header and footer and is split into multiple lines, reformat it by hand so that you have a single string of characters that excludes the header and footer, and runs together such that every line of the key wraps to the next.
   2. Base64-decode the public key to render a DER-formatted public-key.
   3. Generate a SHA256 hex-digest of the DER-formatted key.
   4. Take the first 32-bytes of the hash. You will not need the rest.
   5. For each character, convert it to base-10, and add the ASCII code for 'a'.

   The following is a Python routine to do this:

   import hashlib
   from base64 import b64decode
   
   def build_id(pub_key_pem):
       pub_key_der = b64decode(pub_key_pem)
       sha = hashlib.sha256(pub_key_der).hexdigest()
       prefix = sha[:32]
   
       reencoded = ""
       ord_a = ord('a')
       for old_char in prefix:
           code = int(old_char, 16)
           new_char = chr(ord_a + code)
   
           reencoded += new_char
   
       return reencoded
   
   def main():
       pub_key = 'MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCjvF5pjuK8gRaw/2LoRYi37QqRd48B/FeO9yFtT6ueY84z/u0NrJ/xbPFc9OCGBi8RKIblVvcbY0ySGqdmp0QsUr/oXN0b06GL4iB8rMhlO082HhMzrClV8OKRJ+eJNhNBl8viwmtJs3MN0x9ljA4HQLaAPBA9a14IUKLjP0pWuwIDAQAB'
   
       id_ = build_id(pub_key)
       print(id_)
   
   if __name__ == '__main__':
       main()
   

   You're more than welcome to test this against an existing extension and its ID. To retrieve its PEM-formatted public-key:

   1. Go into the list of your existing extensions in Chrome. Grab the extension-ID of one.
   2. Find the directory where the extension is hosted. On my Windows 7 box, it is: C:\Users\\AppData\Local\Google\Chrome\User Data\Default\Extensions\
   3. Grab the public-key from the manifest.json file under "key". Since the key is already ready to be base64-decoded, you can skip step (1) of the process.

   The public-key in the example is from the "Chrome Reader" extension. Its extension ID is "lojpenhmoajbiciapkjkiekmobleogjc".

   See also:

   1. Google Chrome - Alphanumeric hashes to identify extensions
   2. http://blog.roomanna.com/12-14-2010/getting-an-extensions-id

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