使用 Python 从 PDF 文件中检索数字签名信息

Question

I am looking for a direction on how to retrieve the digital signature information in a PDF (signer details, date of signature, issuer, etc) with Python 2.7. Do I need to use a signature module like django-endesive (not the endesive since I think its , or can I retrieve it while reading a file?

Currently the user adds the signature via an external program, locally, and then uploads the file to the server via the application and encrypts it with pycrypto.

Is it possible to retrieve that information during -say- reading the file before encryption and how can I go about that?

Below is the code I use to encrypt a file:

encryptor = AES.new(key, AES.MODE_CBC, IV)

with open(filename, "rb") as infile:
  if not os.path.isfile(outFile):
    with open(outFile, "wb") as outfile:
      outfile.write(filesize)
      outfile.write(IV)
      while True:
       chunk = infile.read(chunksize)
       if len(chunk) == 0:
         break
       elif len(chunk)%16 !=0:
         chunk += ' ' * (16 - (len(chunk)%16))

       outfile.write(encryptor.encrypt(chunk))

Answer 1

你可以使用pyhanko 。

pyhanko sign validate --pretty-print test.pdf