rewrite to zmq push and pull patterns.

file load works, suite can start up

Azaion.AI/security.pyx

@@ -1,10 +1,11 @@
+import base64
 import hashlib
 import os
-from cryptography.hazmat.primitives.ciphers import Cipher, algorithms, modes
-from cryptography.hazmat.backends import default_backend
-from cryptography.hazmat.primitives.hashes import Hash, SHA256
 from hashlib import sha384
-import base64
+
+from cryptography.hazmat.backends import default_backend
+from cryptography.hazmat.primitives import padding
+from cryptography.hazmat.primitives.ciphers import Cipher, algorithms, modes
 
 BUFFER_SIZE = 64 * 1024  # 64 KB
 
@@ -38,7 +39,9 @@ cdef class Security:
             decrypted_chunk = decryptor.update(chunk)
             res.extend(decrypted_chunk)
         res.extend(decryptor.finalize())
-        return res
+
+        unpadder = padding.PKCS7(128).unpadder()  # AES block size is 128 bits (16 bytes)
+        return unpadder.update(res) + unpadder.finalize()
 
     @staticmethod
     cdef calc_hash(str key):