Ausgabe der neuen DB Einträge

venv/lib/python3.9/site-packages/cryptography/hazmat/primitives/kdf/concatkdf.py

@@ -0,0 +1,131 @@
+# This file is dual licensed under the terms of the Apache License, Version
+# 2.0, and the BSD License. See the LICENSE file in the root of this repository
+# for complete details.
+
+from __future__ import absolute_import, division, print_function
+
+import struct
+
+from cryptography import utils
+from cryptography.exceptions import (
+    AlreadyFinalized,
+    InvalidKey,
+    UnsupportedAlgorithm,
+    _Reasons,
+)
+from cryptography.hazmat.backends import _get_backend
+from cryptography.hazmat.backends.interfaces import HMACBackend
+from cryptography.hazmat.backends.interfaces import HashBackend
+from cryptography.hazmat.primitives import constant_time, hashes, hmac
+from cryptography.hazmat.primitives.kdf import KeyDerivationFunction
+
+
+def _int_to_u32be(n):
+    return struct.pack(">I", n)
+
+
+def _common_args_checks(algorithm, length, otherinfo):
+    max_length = algorithm.digest_size * (2 ** 32 - 1)
+    if length > max_length:
+        raise ValueError(
+            "Can not derive keys larger than {} bits.".format(max_length)
+        )
+    if otherinfo is not None:
+        utils._check_bytes("otherinfo", otherinfo)
+
+
+def _concatkdf_derive(key_material, length, auxfn, otherinfo):
+    utils._check_byteslike("key_material", key_material)
+    output = [b""]
+    outlen = 0
+    counter = 1
+
+    while length > outlen:
+        h = auxfn()
+        h.update(_int_to_u32be(counter))
+        h.update(key_material)
+        h.update(otherinfo)
+        output.append(h.finalize())
+        outlen += len(output[-1])
+        counter += 1
+
+    return b"".join(output)[:length]
+
+
+@utils.register_interface(KeyDerivationFunction)
+class ConcatKDFHash(object):
+    def __init__(self, algorithm, length, otherinfo, backend=None):
+        backend = _get_backend(backend)
+
+        _common_args_checks(algorithm, length, otherinfo)
+        self._algorithm = algorithm
+        self._length = length
+        self._otherinfo = otherinfo
+        if self._otherinfo is None:
+            self._otherinfo = b""
+
+        if not isinstance(backend, HashBackend):
+            raise UnsupportedAlgorithm(
+                "Backend object does not implement HashBackend.",
+                _Reasons.BACKEND_MISSING_INTERFACE,
+            )
+        self._backend = backend
+        self._used = False
+
+    def _hash(self):
+        return hashes.Hash(self._algorithm, self._backend)
+
+    def derive(self, key_material):
+        if self._used:
+            raise AlreadyFinalized
+        self._used = True
+        return _concatkdf_derive(
+            key_material, self._length, self._hash, self._otherinfo
+        )
+
+    def verify(self, key_material, expected_key):
+        if not constant_time.bytes_eq(self.derive(key_material), expected_key):
+            raise InvalidKey
+
+
+@utils.register_interface(KeyDerivationFunction)
+class ConcatKDFHMAC(object):
+    def __init__(self, algorithm, length, salt, otherinfo, backend=None):
+        backend = _get_backend(backend)
+
+        _common_args_checks(algorithm, length, otherinfo)
+        self._algorithm = algorithm
+        self._length = length
+        self._otherinfo = otherinfo
+        if self._otherinfo is None:
+            self._otherinfo = b""
+
+        if salt is None:
+            salt = b"\x00" * algorithm.block_size
+        else:
+            utils._check_bytes("salt", salt)
+
+        self._salt = salt
+
+        if not isinstance(backend, HMACBackend):
+            raise UnsupportedAlgorithm(
+                "Backend object does not implement HMACBackend.",
+                _Reasons.BACKEND_MISSING_INTERFACE,
+            )
+        self._backend = backend
+        self._used = False
+
+    def _hmac(self):
+        return hmac.HMAC(self._salt, self._algorithm, self._backend)
+
+    def derive(self, key_material):
+        if self._used:
+            raise AlreadyFinalized
+        self._used = True
+        return _concatkdf_derive(
+            key_material, self._length, self._hmac, self._otherinfo
+        )
+
+    def verify(self, key_material, expected_key):
+        if not constant_time.bytes_eq(self.derive(key_material), expected_key):
+            raise InvalidKey