auth_data.py 文件源码

def _ParseOpusInfo(self, opus_info_asn1):
    spc_opus_info, rest = decoder.decode(opus_info_asn1,
                                         asn1Spec=spc.SpcSpOpusInfo())
    if rest: raise Asn1Error('Extra unparsed content.')

    if spc_opus_info['programName']:
      # According to spec, this should always be a Unicode string. However,
      # the ASN.1 syntax allows both ASCII and Unicode. So, let's be careful.
      opus_prog_name = spc_opus_info['programName']
      uni_name = opus_prog_name['unicode']
      ascii_name = opus_prog_name['ascii']
      if ascii_name and uni_name:
        # WTF? This is supposed to be a CHOICE
        raise Asn1Error('Both elements of a choice are present.')
      elif uni_name:
        program_name = str(uni_name).decode('utf-16-be')
      elif ascii_name:
        program_name = str(ascii_name)
      else:
        raise Asn1Error('No element of opusInfo choice is present.')
    else:
      # According to spec, there should always be a program name,
      # and be it zero-length. But let's be gentle, since ASN.1 marks
      # this field als optional.
      program_name = None

    # Again, according to Authenticode spec, the moreInfo field should always
    # be there and point to an ASCII string with a URL.
    if spc_opus_info['moreInfo']:
      more_info = spc_opus_info['moreInfo']
      if more_info['url']:
        more_info_link = str(more_info['url'])
      else:
        raise Asn1Error('Expected a URL in moreInfo.')
    else:
      more_info_link = None

    return program_name, more_info_link