diff --git a/app/helper.py b/app/helper.py
deleted file mode 100644
index b416ab3..0000000
--- a/app/helper.py
+++ /dev/null
@@ -1,20 +0,0 @@
-from Crypto.PublicKey import RSA
-from Crypto.PublicKey.RSA import RsaKey
-
-
-def load_file(filename) -> bytes:
-    with open(filename, 'rb') as file:
-        content = file.read()
-    return content
-
-
-def load_key(filename) -> RsaKey:
-    return RSA.import_key(extern_key=load_file(filename), passphrase=None)
-
-
-def private_bytes(rsa: RsaKey) -> bytes:
-    return rsa.export_key(format='PEM', passphrase=None, protection=None)
-
-
-def public_key(rsa: RsaKey) -> bytes:
-    return rsa.public_key().export_key(format='PEM')
diff --git a/app/main.py b/app/main.py
index 42ac2d2..39d3641 100644
--- a/app/main.py
+++ b/app/main.py
@@ -12,8 +12,19 @@ from calendar import timegm
 from jose import jws, jwk, jwt
 from jose.constants import ALGORITHMS
 from starlette.responses import StreamingResponse, JSONResponse
+from Crypto.PublicKey import RSA
+from Crypto.PublicKey.RSA import RsaKey
+
+
+def load_file(filename) -> bytes:
+    with open(filename, 'rb') as file:
+        content = file.read()
+    return content
+
+
+def load_key(filename) -> RsaKey:
+    return RSA.import_key(extern_key=load_file(filename), passphrase=None)
 
-from helper import load_key, private_bytes, public_key
 
 # todo: initialize certificate (or should be done by user, and passed through "volumes"?)