add vector and test for longer salt length in PBE (#12977)

* add vector and test for longer salt length in PBE

* Update docs/development/test-vectors.rst

Co-authored-by: Alex Gaynor <alex.gaynor@gmail.com>

---------

Co-authored-by: Alex Gaynor <alex.gaynor@gmail.com>

Author: reaperhulk

docs/development/test-vectors.rst

@@ -288,6 +288,8 @@ Custom asymmetric vectors
 * ``asymmetric/PKCS8/rsa-pbewithmd5anddescbc.pem`` - A PKCS8 encoded RSA key
   encrypted using the ``pbeWithMD5AndDES-CBC`` algorithm with the password
   ``hunter2``.
+* ``asymmetric/PKCS8/rsa-pbe-3des-long-salt.pem`` - A PKCS8 encoded RSA key
+  encrypted with a 20 byte salt with the password ``password``.
 
 Key exchange
 ~~~~~~~~~~~~

tests/hazmat/primitives/test_serialization.py

@@ -463,6 +463,20 @@ def test_load_pkcs8_private_key_unknown_kdf(self):
         with pytest.raises(ValueError):
             load_pem_private_key(data, password=b"password")
 
+    @pytest.mark.skip_fips(reason="3DES unsupported in FIPS")
+    def test_load_pkcs8_pbes_long_salt(self):
+        data = load_vectors_from_file(
+            os.path.join("asymmetric", "PKCS8", "rsa-pbe-3des-long-salt.pem"),
+            lambda f: f.read(),
+            mode="rb",
+        )
+        key = load_pem_private_key(
+            data, password=b"password", unsafe_skip_rsa_key_validation=True
+        )
+        assert isinstance(key, rsa.RSAPrivateKey)
+        assert key.key_size == 4096
+        assert key.private_numbers().public_numbers.e == 65537
+
     @pytest.mark.parametrize(
         "filename",
         [

vectors/cryptography_vectors/asymmetric/PKCS8/rsa-pbe-3des-long-salt.pem

@@ -0,0 +1,53 @@
+-----BEGIN ENCRYPTED PRIVATE KEY-----
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+-----END ENCRYPTED PRIVATE KEY-----