examples: Use Cryptosigner.private_bytes

private_bytes was just added to CryptoSigner, use it.

Signed-off-by: Jussi Kukkonen <jkukkonen@google.com>

Author: jku

examples/uploader/_localrepo.py

@@ -12,11 +12,6 @@
 from typing import Dict
 
 import requests
-from cryptography.hazmat.primitives.serialization import (
-    Encoding,
-    NoEncryption,
-    PrivateFormat,
-)
 from securesystemslib.signer import CryptoSigner, Signer
 
 from tuf.api.exceptions import RepositoryError
@@ -134,13 +129,7 @@ def add_delegation(self, role: str) -> bool:
 
         # Store the private key using rolename as filename
         with open(f"{self.key_dir}/{role}", "wb") as f:
-            # TODO this is dumb and  needs to be securesystemslibs job...
-            priv_key = signer._private_key.private_bytes(
-                encoding=Encoding.PEM,
-                format=PrivateFormat.PKCS8,
-                encryption_algorithm=NoEncryption(),
-            )
-            f.write(priv_key)
+            f.write(signer.private_bytes)
 
         print(f"Uploaded new delegation, stored key in {self.key_dir}/{role}")
         return True

requirements/pinned.txt

@@ -6,5 +6,5 @@ idna==3.7                 # via requests
 pycparser==2.22           # via cffi
 pynacl==1.5.0             # via securesystemslib
 requests==2.31.0
-securesystemslib[crypto,pynacl] @ git+https://github.com/secure-systems-lab/securesystemslib@34a42954b5064610ec98406bb55719fd19874089
+securesystemslib[crypto,pynacl] @ git+https://github.com/secure-systems-lab/securesystemslib@530411d927c789dd4b6e4c19ce367a78bcea446c
 urllib3==2.2.1           # via requests