pudquick

import objc
from Foundation import NSBundle

Security_bundle = NSBundle.bundleWithIdentifier_('com.apple.security')

CMSDecoderRef = objc.createOpaquePointerType("CMSDecoderRef", b"^{CMSDecoder}", None)

functions = [('CMSDecoderCreate',          b'io^^{CMSDecoder}'),
             ('CMSDecoderUpdateMessage',   b'i^{CMSDecoder}*I'),
             ('CMSDecoderFinalizeMessage', b'i^{CMSDecoder}',),

pudquick

import base64, hashlib
from ctypes import CDLL, POINTER, Structure, create_string_buffer, byref
from ctypes.util import find_library

Security = CDLL(find_library('Security'))
# Importing this via C because haven't figured out how to mix in pyObjc version yet
c_CoreFoundation = CDLL(find_library('CoreFoundation'))

class OpaqueType(Structure):
    pass