First ansible commit
This commit is contained in:
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# This file is dual licensed under the terms of the Apache License, Version
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# 2.0, and the BSD License. See the LICENSE file in the root of this repository
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# for complete details.
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from __future__ import absolute_import, division, print_function
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import abc
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import six
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@six.add_metaclass(abc.ABCMeta)
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class KeyDerivationFunction(object):
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@abc.abstractmethod
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def derive(self, key_material):
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"""
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Deterministically generates and returns a new key based on the existing
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key material.
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"""
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@abc.abstractmethod
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def verify(self, key_material, expected_key):
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"""
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Checks whether the key generated by the key material matches the
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expected derived key. Raises an exception if they do not match.
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"""
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# This file is dual licensed under the terms of the Apache License, Version
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# 2.0, and the BSD License. See the LICENSE file in the root of this repository
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# for complete details.
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from __future__ import absolute_import, division, print_function
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import struct
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from cryptography import utils
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from cryptography.exceptions import (
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AlreadyFinalized, InvalidKey, UnsupportedAlgorithm, _Reasons
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)
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from cryptography.hazmat.backends.interfaces import HMACBackend
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from cryptography.hazmat.backends.interfaces import HashBackend
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from cryptography.hazmat.primitives import constant_time, hashes, hmac
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from cryptography.hazmat.primitives.kdf import KeyDerivationFunction
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def _int_to_u32be(n):
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return struct.pack('>I', n)
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def _common_args_checks(algorithm, length, otherinfo):
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max_length = algorithm.digest_size * (2 ** 32 - 1)
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if length > max_length:
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raise ValueError(
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"Can not derive keys larger than {0} bits.".format(
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max_length
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))
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if not (otherinfo is None or isinstance(otherinfo, bytes)):
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raise TypeError("otherinfo must be bytes.")
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def _concatkdf_derive(key_material, length, auxfn, otherinfo):
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if not isinstance(key_material, bytes):
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raise TypeError("key_material must be bytes.")
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output = [b""]
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outlen = 0
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counter = 1
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while (length > outlen):
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h = auxfn()
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h.update(_int_to_u32be(counter))
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h.update(key_material)
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h.update(otherinfo)
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output.append(h.finalize())
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outlen += len(output[-1])
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counter += 1
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return b"".join(output)[:length]
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@utils.register_interface(KeyDerivationFunction)
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class ConcatKDFHash(object):
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def __init__(self, algorithm, length, otherinfo, backend):
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_common_args_checks(algorithm, length, otherinfo)
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self._algorithm = algorithm
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self._length = length
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self._otherinfo = otherinfo
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if self._otherinfo is None:
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self._otherinfo = b""
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if not isinstance(backend, HashBackend):
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raise UnsupportedAlgorithm(
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"Backend object does not implement HashBackend.",
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_Reasons.BACKEND_MISSING_INTERFACE
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)
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self._backend = backend
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self._used = False
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def _hash(self):
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return hashes.Hash(self._algorithm, self._backend)
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def derive(self, key_material):
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if self._used:
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raise AlreadyFinalized
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self._used = True
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return _concatkdf_derive(key_material, self._length,
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self._hash, self._otherinfo)
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def verify(self, key_material, expected_key):
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if not constant_time.bytes_eq(self.derive(key_material), expected_key):
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raise InvalidKey
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@utils.register_interface(KeyDerivationFunction)
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class ConcatKDFHMAC(object):
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def __init__(self, algorithm, length, salt, otherinfo, backend):
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_common_args_checks(algorithm, length, otherinfo)
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self._algorithm = algorithm
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self._length = length
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self._otherinfo = otherinfo
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if self._otherinfo is None:
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self._otherinfo = b""
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if not (salt is None or isinstance(salt, bytes)):
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raise TypeError("salt must be bytes.")
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if salt is None:
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salt = b"\x00" * algorithm.block_size
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self._salt = salt
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if not isinstance(backend, HMACBackend):
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raise UnsupportedAlgorithm(
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"Backend object does not implement HMACBackend.",
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_Reasons.BACKEND_MISSING_INTERFACE
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)
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self._backend = backend
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self._used = False
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def _hmac(self):
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return hmac.HMAC(self._salt, self._algorithm, self._backend)
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def derive(self, key_material):
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if self._used:
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raise AlreadyFinalized
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self._used = True
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return _concatkdf_derive(key_material, self._length,
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self._hmac, self._otherinfo)
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def verify(self, key_material, expected_key):
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if not constant_time.bytes_eq(self.derive(key_material), expected_key):
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raise InvalidKey
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# This file is dual licensed under the terms of the Apache License, Version
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# 2.0, and the BSD License. See the LICENSE file in the root of this repository
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# for complete details.
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from __future__ import absolute_import, division, print_function
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import six
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from cryptography import utils
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from cryptography.exceptions import (
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AlreadyFinalized, InvalidKey, UnsupportedAlgorithm, _Reasons
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)
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from cryptography.hazmat.backends.interfaces import HMACBackend
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from cryptography.hazmat.primitives import constant_time, hmac
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from cryptography.hazmat.primitives.kdf import KeyDerivationFunction
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@utils.register_interface(KeyDerivationFunction)
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class HKDF(object):
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def __init__(self, algorithm, length, salt, info, backend):
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if not isinstance(backend, HMACBackend):
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raise UnsupportedAlgorithm(
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"Backend object does not implement HMACBackend.",
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_Reasons.BACKEND_MISSING_INTERFACE
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)
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self._algorithm = algorithm
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if not (salt is None or isinstance(salt, bytes)):
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raise TypeError("salt must be bytes.")
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if salt is None:
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salt = b"\x00" * self._algorithm.digest_size
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self._salt = salt
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self._backend = backend
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self._hkdf_expand = HKDFExpand(self._algorithm, length, info, backend)
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def _extract(self, key_material):
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h = hmac.HMAC(self._salt, self._algorithm, backend=self._backend)
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h.update(key_material)
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return h.finalize()
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def derive(self, key_material):
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if not isinstance(key_material, bytes):
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raise TypeError("key_material must be bytes.")
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return self._hkdf_expand.derive(self._extract(key_material))
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def verify(self, key_material, expected_key):
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if not constant_time.bytes_eq(self.derive(key_material), expected_key):
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raise InvalidKey
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@utils.register_interface(KeyDerivationFunction)
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class HKDFExpand(object):
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def __init__(self, algorithm, length, info, backend):
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if not isinstance(backend, HMACBackend):
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raise UnsupportedAlgorithm(
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"Backend object does not implement HMACBackend.",
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_Reasons.BACKEND_MISSING_INTERFACE
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)
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self._algorithm = algorithm
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self._backend = backend
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max_length = 255 * algorithm.digest_size
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if length > max_length:
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raise ValueError(
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"Can not derive keys larger than {0} octets.".format(
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max_length
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))
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self._length = length
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if not (info is None or isinstance(info, bytes)):
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raise TypeError("info must be bytes.")
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if info is None:
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info = b""
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self._info = info
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self._used = False
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def _expand(self, key_material):
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output = [b""]
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counter = 1
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while self._algorithm.digest_size * (len(output) - 1) < self._length:
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h = hmac.HMAC(key_material, self._algorithm, backend=self._backend)
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h.update(output[-1])
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h.update(self._info)
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h.update(six.int2byte(counter))
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output.append(h.finalize())
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counter += 1
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return b"".join(output)[:self._length]
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def derive(self, key_material):
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if not isinstance(key_material, bytes):
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raise TypeError("key_material must be bytes.")
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if self._used:
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raise AlreadyFinalized
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self._used = True
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return self._expand(key_material)
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def verify(self, key_material, expected_key):
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if not constant_time.bytes_eq(self.derive(key_material), expected_key):
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raise InvalidKey
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@@ -0,0 +1,148 @@
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# This file is dual licensed under the terms of the Apache License, Version
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# 2.0, and the BSD License. See the LICENSE file in the root of this repository
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# for complete details.
|
||||
|
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from __future__ import absolute_import, division, print_function
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from enum import Enum
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from six.moves import range
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from cryptography import utils
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from cryptography.exceptions import (
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AlreadyFinalized, InvalidKey, UnsupportedAlgorithm, _Reasons
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)
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from cryptography.hazmat.backends.interfaces import HMACBackend
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from cryptography.hazmat.primitives import constant_time, hashes, hmac
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from cryptography.hazmat.primitives.kdf import KeyDerivationFunction
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class Mode(Enum):
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CounterMode = "ctr"
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class CounterLocation(Enum):
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BeforeFixed = "before_fixed"
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AfterFixed = "after_fixed"
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@utils.register_interface(KeyDerivationFunction)
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class KBKDFHMAC(object):
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def __init__(self, algorithm, mode, length, rlen, llen,
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location, label, context, fixed, backend):
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if not isinstance(backend, HMACBackend):
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raise UnsupportedAlgorithm(
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"Backend object does not implement HMACBackend.",
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_Reasons.BACKEND_MISSING_INTERFACE
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)
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if not isinstance(algorithm, hashes.HashAlgorithm):
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raise UnsupportedAlgorithm(
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"Algorithm supplied is not a supported hash algorithm.",
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_Reasons.UNSUPPORTED_HASH
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)
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if not backend.hmac_supported(algorithm):
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raise UnsupportedAlgorithm(
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"Algorithm supplied is not a supported hmac algorithm.",
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_Reasons.UNSUPPORTED_HASH
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)
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if not isinstance(mode, Mode):
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raise TypeError("mode must be of type Mode")
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if not isinstance(location, CounterLocation):
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raise TypeError("location must be of type CounterLocation")
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if (label or context) and fixed:
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raise ValueError("When supplying fixed data, "
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"label and context are ignored.")
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if rlen is None or not self._valid_byte_length(rlen):
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raise ValueError("rlen must be between 1 and 4")
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if llen is None and fixed is None:
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raise ValueError("Please specify an llen")
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if llen is not None and not isinstance(llen, int):
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raise TypeError("llen must be an integer")
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if label is None:
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label = b''
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if context is None:
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context = b''
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|
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if (not isinstance(label, bytes) or
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not isinstance(context, bytes)):
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raise TypeError('label and context must be of type bytes')
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self._algorithm = algorithm
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self._mode = mode
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self._length = length
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self._rlen = rlen
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self._llen = llen
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self._location = location
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self._label = label
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self._context = context
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self._backend = backend
|
||||
self._used = False
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self._fixed_data = fixed
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|
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def _valid_byte_length(self, value):
|
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if not isinstance(value, int):
|
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raise TypeError('value must be of type int')
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value_bin = utils.int_to_bytes(1, value)
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if not 1 <= len(value_bin) <= 4:
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return False
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return True
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|
||||
def derive(self, key_material):
|
||||
if self._used:
|
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raise AlreadyFinalized
|
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|
||||
if not isinstance(key_material, bytes):
|
||||
raise TypeError('key_material must be bytes')
|
||||
self._used = True
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||||
|
||||
# inverse floor division (equivalent to ceiling)
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rounds = -(-self._length // self._algorithm.digest_size)
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||||
|
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output = [b'']
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|
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# For counter mode, the number of iterations shall not be
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# larger than 2^r-1, where r <= 32 is the binary length of the counter
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||||
# This ensures that the counter values used as an input to the
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||||
# PRF will not repeat during a particular call to the KDF function.
|
||||
r_bin = utils.int_to_bytes(1, self._rlen)
|
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if rounds > pow(2, len(r_bin) * 8) - 1:
|
||||
raise ValueError('There are too many iterations.')
|
||||
|
||||
for i in range(1, rounds + 1):
|
||||
h = hmac.HMAC(key_material, self._algorithm, backend=self._backend)
|
||||
|
||||
counter = utils.int_to_bytes(i, self._rlen)
|
||||
if self._location == CounterLocation.BeforeFixed:
|
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h.update(counter)
|
||||
|
||||
h.update(self._generate_fixed_input())
|
||||
|
||||
if self._location == CounterLocation.AfterFixed:
|
||||
h.update(counter)
|
||||
|
||||
output.append(h.finalize())
|
||||
|
||||
return b''.join(output)[:self._length]
|
||||
|
||||
def _generate_fixed_input(self):
|
||||
if self._fixed_data and isinstance(self._fixed_data, bytes):
|
||||
return self._fixed_data
|
||||
|
||||
l_val = utils.int_to_bytes(self._length * 8, self._llen)
|
||||
|
||||
return b"".join([self._label, b"\x00", self._context, l_val])
|
||||
|
||||
def verify(self, key_material, expected_key):
|
||||
if not constant_time.bytes_eq(self.derive(key_material), expected_key):
|
||||
raise InvalidKey
|
||||
Binary file not shown.
@@ -0,0 +1,58 @@
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||||
# 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
|
||||
|
||||
from cryptography import utils
|
||||
from cryptography.exceptions import (
|
||||
AlreadyFinalized, InvalidKey, UnsupportedAlgorithm, _Reasons
|
||||
)
|
||||
from cryptography.hazmat.backends.interfaces import PBKDF2HMACBackend
|
||||
from cryptography.hazmat.primitives import constant_time
|
||||
from cryptography.hazmat.primitives.kdf import KeyDerivationFunction
|
||||
|
||||
|
||||
@utils.register_interface(KeyDerivationFunction)
|
||||
class PBKDF2HMAC(object):
|
||||
def __init__(self, algorithm, length, salt, iterations, backend):
|
||||
if not isinstance(backend, PBKDF2HMACBackend):
|
||||
raise UnsupportedAlgorithm(
|
||||
"Backend object does not implement PBKDF2HMACBackend.",
|
||||
_Reasons.BACKEND_MISSING_INTERFACE
|
||||
)
|
||||
|
||||
if not backend.pbkdf2_hmac_supported(algorithm):
|
||||
raise UnsupportedAlgorithm(
|
||||
"{0} is not supported for PBKDF2 by this backend.".format(
|
||||
algorithm.name),
|
||||
_Reasons.UNSUPPORTED_HASH
|
||||
)
|
||||
self._used = False
|
||||
self._algorithm = algorithm
|
||||
self._length = length
|
||||
if not isinstance(salt, bytes):
|
||||
raise TypeError("salt must be bytes.")
|
||||
self._salt = salt
|
||||
self._iterations = iterations
|
||||
self._backend = backend
|
||||
|
||||
def derive(self, key_material):
|
||||
if self._used:
|
||||
raise AlreadyFinalized("PBKDF2 instances can only be used once.")
|
||||
self._used = True
|
||||
|
||||
if not isinstance(key_material, bytes):
|
||||
raise TypeError("key_material must be bytes.")
|
||||
return self._backend.derive_pbkdf2_hmac(
|
||||
self._algorithm,
|
||||
self._length,
|
||||
self._salt,
|
||||
self._iterations,
|
||||
key_material
|
||||
)
|
||||
|
||||
def verify(self, key_material, expected_key):
|
||||
derived_key = self.derive(key_material)
|
||||
if not constant_time.bytes_eq(derived_key, expected_key):
|
||||
raise InvalidKey("Keys do not match.")
|
||||
Binary file not shown.
@@ -0,0 +1,66 @@
|
||||
# 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 sys
|
||||
|
||||
from cryptography import utils
|
||||
from cryptography.exceptions import (
|
||||
AlreadyFinalized, InvalidKey, UnsupportedAlgorithm, _Reasons
|
||||
)
|
||||
from cryptography.hazmat.backends.interfaces import ScryptBackend
|
||||
from cryptography.hazmat.primitives import constant_time
|
||||
from cryptography.hazmat.primitives.kdf import KeyDerivationFunction
|
||||
|
||||
|
||||
# This is used by the scrypt tests to skip tests that require more memory
|
||||
# than the MEM_LIMIT
|
||||
_MEM_LIMIT = sys.maxsize // 2
|
||||
|
||||
|
||||
@utils.register_interface(KeyDerivationFunction)
|
||||
class Scrypt(object):
|
||||
def __init__(self, salt, length, n, r, p, backend):
|
||||
if not isinstance(backend, ScryptBackend):
|
||||
raise UnsupportedAlgorithm(
|
||||
"Backend object does not implement ScryptBackend.",
|
||||
_Reasons.BACKEND_MISSING_INTERFACE
|
||||
)
|
||||
|
||||
self._length = length
|
||||
if not isinstance(salt, bytes):
|
||||
raise TypeError("salt must be bytes.")
|
||||
|
||||
if n < 2 or (n & (n - 1)) != 0:
|
||||
raise ValueError("n must be greater than 1 and be a power of 2.")
|
||||
|
||||
if r < 1:
|
||||
raise ValueError("r must be greater than or equal to 1.")
|
||||
|
||||
if p < 1:
|
||||
raise ValueError("p must be greater than or equal to 1.")
|
||||
|
||||
self._used = False
|
||||
self._salt = salt
|
||||
self._n = n
|
||||
self._r = r
|
||||
self._p = p
|
||||
self._backend = backend
|
||||
|
||||
def derive(self, key_material):
|
||||
if self._used:
|
||||
raise AlreadyFinalized("Scrypt instances can only be used once.")
|
||||
self._used = True
|
||||
|
||||
if not isinstance(key_material, bytes):
|
||||
raise TypeError("key_material must be bytes.")
|
||||
return self._backend.derive_scrypt(
|
||||
key_material, self._salt, self._length, self._n, self._r, self._p
|
||||
)
|
||||
|
||||
def verify(self, key_material, expected_key):
|
||||
derived_key = self.derive(key_material)
|
||||
if not constant_time.bytes_eq(derived_key, expected_key):
|
||||
raise InvalidKey("Keys do not match.")
|
||||
Binary file not shown.
@@ -0,0 +1,70 @@
|
||||
# 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.interfaces import HashBackend
|
||||
from cryptography.hazmat.primitives import constant_time, hashes
|
||||
from cryptography.hazmat.primitives.kdf import KeyDerivationFunction
|
||||
|
||||
|
||||
def _int_to_u32be(n):
|
||||
return struct.pack('>I', n)
|
||||
|
||||
|
||||
@utils.register_interface(KeyDerivationFunction)
|
||||
class X963KDF(object):
|
||||
def __init__(self, algorithm, length, sharedinfo, backend):
|
||||
|
||||
max_len = algorithm.digest_size * (2 ** 32 - 1)
|
||||
if length > max_len:
|
||||
raise ValueError(
|
||||
"Can not derive keys larger than {0} bits.".format(max_len))
|
||||
if not (sharedinfo is None or isinstance(sharedinfo, bytes)):
|
||||
raise TypeError("sharedinfo must be bytes.")
|
||||
self._algorithm = algorithm
|
||||
self._length = length
|
||||
self._sharedinfo = sharedinfo
|
||||
|
||||
if not isinstance(backend, HashBackend):
|
||||
raise UnsupportedAlgorithm(
|
||||
"Backend object does not implement HashBackend.",
|
||||
_Reasons.BACKEND_MISSING_INTERFACE
|
||||
)
|
||||
self._backend = backend
|
||||
self._used = False
|
||||
|
||||
def derive(self, key_material):
|
||||
if self._used:
|
||||
raise AlreadyFinalized
|
||||
self._used = True
|
||||
|
||||
if not isinstance(key_material, bytes):
|
||||
raise TypeError("key_material must be bytes.")
|
||||
|
||||
output = [b""]
|
||||
outlen = 0
|
||||
counter = 1
|
||||
|
||||
while self._length > outlen:
|
||||
h = hashes.Hash(self._algorithm, self._backend)
|
||||
h.update(key_material)
|
||||
h.update(_int_to_u32be(counter))
|
||||
if self._sharedinfo is not None:
|
||||
h.update(self._sharedinfo)
|
||||
output.append(h.finalize())
|
||||
outlen += len(output[-1])
|
||||
counter += 1
|
||||
|
||||
return b"".join(output)[:self._length]
|
||||
|
||||
def verify(self, key_material, expected_key):
|
||||
if not constant_time.bytes_eq(self.derive(key_material), expected_key):
|
||||
raise InvalidKey
|
||||
Binary file not shown.
Reference in New Issue
Block a user