Added SKI and AKI extensions

Signed-off-by: Tero Saarni <[email protected]>

README.md

@@ -40,6 +40,7 @@ pip install certy
 Create virtual environment by running `python3 -m venv .venv`, then activate it `source .venv/bin/activate`.
 Install dependencies by running `pip install -r dev-requirements.txt`.
 Run tests with `pytest`.
+To build wheel, run `flit build` and check the generated wheel in `dist` directory.
 To find out coverage of tests, execute `coverage run -m pytest` and then `coverage html`.
 The coverage report is generated to `htmlcov/index.html`.
 

src/certy/credential.py

@@ -405,6 +405,15 @@ def generate(self) -> Credential:
         )
 
         builder = builder.add_extension(x509.BasicConstraints(ca=self._is_ca, path_length=None), critical=True)
+        builder = builder.add_extension(
+            x509.SubjectKeyIdentifier.from_public_key(self._private_key.public_key()), critical=False
+        )
+
+        if self._issuer is not None:
+            builder = builder.add_extension(
+                x509.AuthorityKeyIdentifier.from_issuer_public_key(effective_issuer._private_key.public_key()),
+                critical=False,
+            )
 
         if self._subject_alt_names is not None:
             builder = builder.add_extension(x509.SubjectAlternativeName(self._subject_alt_names), critical=False)