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venv/lib/python3.12/site-packages/asyncssh/crypto/kdf.py

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+# Copyright (c) 2017-2021 by Ron Frederick <ronf@timeheart.net> and others.
+#
+# This program and the accompanying materials are made available under
+# the terms of the Eclipse Public License v2.0 which accompanies this
+# distribution and is available at:
+#
+#     http://www.eclipse.org/legal/epl-2.0/
+#
+# This program may also be made available under the following secondary
+# licenses when the conditions for such availability set forth in the
+# Eclipse Public License v2.0 are satisfied:
+#
+#    GNU General Public License, Version 2.0, or any later versions of
+#    that license
+#
+# SPDX-License-Identifier: EPL-2.0 OR GPL-2.0-or-later
+#
+# Contributors:
+#     Ron Frederick - initial implementation, API, and documentation
+
+"""A shim around PyCA for key derivation functions"""
+
+from cryptography.hazmat.primitives.kdf.pbkdf2 import PBKDF2HMAC
+
+from .misc import hashes
+
+
+def pbkdf2_hmac(hash_name: str, passphrase: bytes, salt: bytes,
+                count: int, key_size: int) -> bytes:
+    """A shim around PyCA for PBKDF2 HMAC key derivation"""
+
+    return PBKDF2HMAC(hashes[hash_name](), key_size, salt,
+                      count).derive(passphrase)