From e893d06cb35fd7c32a8682b3f538086c663f30de Mon Sep 17 00:00:00 2001
From: Jean-Paul Calderone <exarkun@twistedmatrix.com>
Date: Fri, 6 Jan 2023 21:00:21 -0500
Subject: [PATCH] RSAPrivateKey certainly does have this method

I don't know why mypy fails to see it.
---
 src/allmydata/crypto/rsa.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/allmydata/crypto/rsa.py b/src/allmydata/crypto/rsa.py
index c21b522cd..3ad893dbf 100644
--- a/src/allmydata/crypto/rsa.py
+++ b/src/allmydata/crypto/rsa.py
@@ -123,7 +123,7 @@ def der_string_from_signing_key(private_key: PrivateKey) -> bytes:
     :returns: bytes representing `private_key`
     """
     _validate_private_key(private_key)
-    return private_key.private_bytes(
+    return private_key.private_bytes( # type: ignore[attr-defined]
         encoding=Encoding.DER,
         format=PrivateFormat.PKCS8,
         encryption_algorithm=NoEncryption(),