major changes

env/lib/python3.5/site-packages/Werkzeug-1.0.1.dist-info/INSTALLER

+pip

env/lib/python3.5/site-packages/Werkzeug-1.0.1.dist-info/LICENSE.rst

+Copyright 2007 Pallets
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+
+1.  Redistributions of source code must retain the above copyright
+    notice, this list of conditions and the following disclaimer.
+
+2.  Redistributions in binary form must reproduce the above copyright
+    notice, this list of conditions and the following disclaimer in the
+    documentation and/or other materials provided with the distribution.
+
+3.  Neither the name of the copyright holder nor the names of its
+    contributors may be used to endorse or promote products derived from
+    this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
+PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
+TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

env/lib/python3.5/site-packages/Werkzeug-1.0.1.dist-info/METADATA

+Metadata-Version: 2.1
+Name: Werkzeug
+Version: 1.0.1
+Summary: The comprehensive WSGI web application library.
+Home-page: https://palletsprojects.com/p/werkzeug/
+Author: Armin Ronacher
+Author-email: armin.ronacher@active-4.com
+Maintainer: Pallets
+Maintainer-email: contact@palletsprojects.com
+License: BSD-3-Clause
+Project-URL: Documentation, https://werkzeug.palletsprojects.com/
+Project-URL: Code, https://github.com/pallets/werkzeug
+Project-URL: Issue tracker, https://github.com/pallets/werkzeug/issues
+Platform: UNKNOWN
+Classifier: Development Status :: 5 - Production/Stable
+Classifier: Environment :: Web Environment
+Classifier: Intended Audience :: Developers
+Classifier: License :: OSI Approved :: BSD License
+Classifier: Operating System :: OS Independent
+Classifier: Programming Language :: Python
+Classifier: Programming Language :: Python :: 2
+Classifier: Programming Language :: Python :: 2.7
+Classifier: Programming Language :: Python :: 3
+Classifier: Programming Language :: Python :: 3.5
+Classifier: Programming Language :: Python :: 3.6
+Classifier: Programming Language :: Python :: 3.7
+Classifier: Programming Language :: Python :: 3.8
+Classifier: Programming Language :: Python :: Implementation :: CPython
+Classifier: Programming Language :: Python :: Implementation :: PyPy
+Classifier: Topic :: Internet :: WWW/HTTP :: Dynamic Content
+Classifier: Topic :: Internet :: WWW/HTTP :: WSGI
+Classifier: Topic :: Internet :: WWW/HTTP :: WSGI :: Application
+Classifier: Topic :: Internet :: WWW/HTTP :: WSGI :: Middleware
+Classifier: Topic :: Software Development :: Libraries :: Application Frameworks
+Classifier: Topic :: Software Development :: Libraries :: Python Modules
+Requires-Python: >=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*
+Description-Content-Type: text/x-rst
+Provides-Extra: dev
+Requires-Dist: pytest ; extra == 'dev'
+Requires-Dist: pytest-timeout ; extra == 'dev'
+Requires-Dist: coverage ; extra == 'dev'
+Requires-Dist: tox ; extra == 'dev'
+Requires-Dist: sphinx ; extra == 'dev'
+Requires-Dist: pallets-sphinx-themes ; extra == 'dev'
+Requires-Dist: sphinx-issues ; extra == 'dev'
+Provides-Extra: watchdog
+Requires-Dist: watchdog ; extra == 'watchdog'
+
+Werkzeug
+========
+
+*werkzeug* German noun: "tool". Etymology: *werk* ("work"), *zeug* ("stuff")
+
+Werkzeug is a comprehensive `WSGI`_ web application library. It began as
+a simple collection of various utilities for WSGI applications and has
+become one of the most advanced WSGI utility libraries.
+
+It includes:
+
+-   An interactive debugger that allows inspecting stack traces and
+    source code in the browser with an interactive interpreter for any
+    frame in the stack.
+-   A full-featured request object with objects to interact with
+    headers, query args, form data, files, and cookies.
+-   A response object that can wrap other WSGI applications and handle
+    streaming data.
+-   A routing system for matching URLs to endpoints and generating URLs
+    for endpoints, with an extensible system for capturing variables
+    from URLs.
+-   HTTP utilities to handle entity tags, cache control, dates, user
+    agents, cookies, files, and more.
+-   A threaded WSGI server for use while developing applications
+    locally.
+-   A test client for simulating HTTP requests during testing without
+    requiring running a server.
+
+Werkzeug is Unicode aware and doesn't enforce any dependencies. It is up
+to the developer to choose a template engine, database adapter, and even
+how to handle requests. It can be used to build all sorts of end user
+applications such as blogs, wikis, or bulletin boards.
+
+`Flask`_ wraps Werkzeug, using it to handle the details of WSGI while
+providing more structure and patterns for defining powerful
+applications.
+
+
+Installing
+----------
+
+Install and update using `pip`_:
+
+.. code-block:: text
+
+    pip install -U Werkzeug
+
+
+A Simple Example
+----------------
+
+.. code-block:: python
+
+    from werkzeug.wrappers import Request, Response
+
+    @Request.application
+    def application(request):
+        return Response('Hello, World!')
+
+    if __name__ == '__main__':
+        from werkzeug.serving import run_simple
+        run_simple('localhost', 4000, application)
+
+
+Links
+-----
+
+-   Website: https://palletsprojects.com/p/werkzeug/
+-   Documentation: https://werkzeug.palletsprojects.com/
+-   Releases: https://pypi.org/project/Werkzeug/
+-   Code: https://github.com/pallets/werkzeug
+-   Issue tracker: https://github.com/pallets/werkzeug/issues
+-   Test status: https://dev.azure.com/pallets/werkzeug/_build
+-   Official chat: https://discord.gg/t6rrQZH
+
+.. _WSGI: https://wsgi.readthedocs.io/en/latest/
+.. _Flask: https://www.palletsprojects.com/p/flask/
+.. _pip: https://pip.pypa.io/en/stable/quickstart/
+
+

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env/lib/python3.5/site-packages/Werkzeug-1.0.1.dist-info/WHEEL

+Wheel-Version: 1.0
+Generator: bdist_wheel (0.34.2)
+Root-Is-Purelib: true
+Tag: py2-none-any
+Tag: py3-none-any
+

env/lib/python3.5/site-packages/Werkzeug-1.0.1.dist-info/top_level.txt

+werkzeug

env/lib/python3.5/site-packages/_virtualenv.pth

+import _virtualenv
\ No newline at end of file

env/lib/python3.5/site-packages/_virtualenv.py

+"""Patches that are applied at runtime to the virtual environment"""
+# -*- coding: utf-8 -*-
+
+import os
+import sys
+
+VIRTUALENV_PATCH_FILE = os.path.join(__file__)
+
+
+def patch_dist(dist):
+    """
+    Distutils allows user to configure some arguments via a configuration file:
+    https://docs.python.org/3/install/index.html#distutils-configuration-files
+
+    Some of this arguments though don't make sense in context of the virtual environment files, let's fix them up.
+    """
+    # we cannot allow some install config as that would get packages installed outside of the virtual environment
+    old_parse_config_files = dist.Distribution.parse_config_files
+
+    def parse_config_files(self, *args, **kwargs):
+        result = old_parse_config_files(self, *args, **kwargs)
+        install = self.get_option_dict("install")
+
+        if "prefix" in install:  # the prefix governs where to install the libraries
+            install["prefix"] = VIRTUALENV_PATCH_FILE, os.path.abspath(sys.prefix)
+        for base in ("purelib", "platlib", "headers", "scripts", "data"):
+            key = "install_{}".format(base)
+            if key in install:  # do not allow global configs to hijack venv paths
+                install.pop(key, None)
+        return result
+
+    dist.Distribution.parse_config_files = parse_config_files
+
+
+# Import hook that patches some modules to ignore configuration values that break package installation in case
+# of virtual environments.
+_DISTUTILS_PATCH = "distutils.dist", "setuptools.dist"
+if sys.version_info > (3, 4):
+    # https://docs.python.org/3/library/importlib.html#setting-up-an-importer
+    from importlib.abc import MetaPathFinder
+    from importlib.util import find_spec
+    from threading import Lock
+    from functools import partial
+
+    class _Finder(MetaPathFinder):
+        """A meta path finder that allows patching the imported distutils modules"""
+
+        fullname = None
+        lock = Lock()
+
+        def find_spec(self, fullname, path, target=None):
+            if fullname in _DISTUTILS_PATCH and self.fullname is None:
+                with self.lock:
+                    self.fullname = fullname
+                    try:
+                        spec = find_spec(fullname, path)
+                        if spec is not None:
+                            # https://www.python.org/dev/peps/pep-0451/#how-loading-will-work
+                            is_new_api = hasattr(spec.loader, "exec_module")
+                            func_name = "exec_module" if is_new_api else "load_module"
+                            old = getattr(spec.loader, func_name)
+                            func = self.exec_module if is_new_api else self.load_module
+                            if old is not func:
+                                try:
+                                    setattr(spec.loader, func_name, partial(func, old))
+                                except AttributeError:
+                                    pass  # C-Extension loaders are r/o such as zipimporter with <python 3.7
+                            return spec
+                    finally:
+                        self.fullname = None
+
+        @staticmethod
+        def exec_module(old, module):
+            old(module)
+            if module.__name__ in _DISTUTILS_PATCH:
+                patch_dist(module)
+
+        @staticmethod
+        def load_module(old, name):
+            module = old(name)
+            if module.__name__ in _DISTUTILS_PATCH:
+                patch_dist(module)
+            return module
+
+    sys.meta_path.insert(0, _Finder())
+else:
+    # https://www.python.org/dev/peps/pep-0302/
+    from imp import find_module
+    from pkgutil import ImpImporter, ImpLoader
+
+    class _VirtualenvImporter(object, ImpImporter):
+        def __init__(self, path=None):
+            object.__init__(self)
+            ImpImporter.__init__(self, path)
+
+        def find_module(self, fullname, path=None):
+            if fullname in _DISTUTILS_PATCH:
+                try:
+                    return _VirtualenvLoader(fullname, *find_module(fullname.split(".")[-1], path))
+                except ImportError:
+                    pass
+            return None
+
+    class _VirtualenvLoader(object, ImpLoader):
+        def __init__(self, fullname, file, filename, etc):
+            object.__init__(self)
+            ImpLoader.__init__(self, fullname, file, filename, etc)
+
+        def load_module(self, fullname):
+            module = super(_VirtualenvLoader, self).load_module(fullname)
+            patch_dist(module)
+            module.__loader__ = None  # distlib fallback
+            return module
+
+    sys.meta_path.append(_VirtualenvImporter())

env/lib/python3.5/site-packages/bcrypt-3.1.7.dist-info/INSTALLER

+pip

env/lib/python3.5/site-packages/bcrypt-3.1.7.dist-info/LICENSE

+                              Apache License
+                        Version 2.0, January 2004
+                     http://www.apache.org/licenses/
+
+TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+1. Definitions.
+
+   "License" shall mean the terms and conditions for use, reproduction,
+   and distribution as defined by Sections 1 through 9 of this document.
+
+   "Licensor" shall mean the copyright owner or entity authorized by
+   the copyright owner that is granting the License.
+
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env/lib/python3.5/site-packages/bcrypt-3.1.7.dist-info/METADATA

+Metadata-Version: 2.1
+Name: bcrypt
+Version: 3.1.7
+Summary: Modern password hashing for your software and your servers
+Home-page: https://github.com/pyca/bcrypt/
+Author: The Python Cryptographic Authority developers
+Author-email: cryptography-dev@python.org
+License: Apache License, Version 2.0
+Platform: UNKNOWN
+Classifier: Development Status :: 5 - Production/Stable
+Classifier: License :: OSI Approved :: Apache Software License
+Classifier: Programming Language :: Python :: Implementation :: CPython
+Classifier: Programming Language :: Python :: Implementation :: PyPy
+Classifier: Programming Language :: Python :: 2
+Classifier: Programming Language :: Python :: 2.7
+Classifier: Programming Language :: Python :: 3
+Classifier: Programming Language :: Python :: 3.4
+Classifier: Programming Language :: Python :: 3.5
+Classifier: Programming Language :: Python :: 3.6
+Classifier: Programming Language :: Python :: 3.7
+Requires-Python: >=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*
+Requires-Dist: cffi (>=1.1)
+Requires-Dist: six (>=1.4.1)
+Provides-Extra: tests
+Requires-Dist: pytest (!=3.3.0,>=3.2.1) ; extra == 'tests'
+
+bcrypt
+======
+
+.. image:: https://img.shields.io/pypi/v/bcrypt.svg
+    :target: https://pypi.org/project/bcrypt/
+    :alt: Latest Version
+
+.. image:: https://travis-ci.org/pyca/bcrypt.svg?branch=master
+    :target: https://travis-ci.org/pyca/bcrypt
+
+.. image:: https://dev.azure.com/pyca/bcrypt/_apis/build/status/bcrypt-CI?branchName=master
+    :target: https://dev.azure.com/pyca/bcrypt/_build/latest?definitionId=8&branchName=master
+
+Good password hashing for your software and your servers
+
+
+Installation
+============
+
+To install bcrypt, simply:
+
+.. code:: bash
+
+    $ pip install bcrypt
+
+Note that bcrypt should build very easily on Linux provided you have a C compiler, headers for Python (if you're not using pypy), and headers for the libffi libraries available on your system.
+
+For Debian and Ubuntu, the following command will ensure that the required dependencies are installed:
+
+.. code:: bash
+
+    $ sudo apt-get install build-essential libffi-dev python-dev
+
+For Fedora and RHEL-derivatives, the following command will ensure that the required dependencies are installed:
+
+.. code:: bash
+
+    $ sudo yum install gcc libffi-devel python-devel
+
+Alternatives
+============
+
+While bcrypt remains a good choice for password storage depending on your specific use case you may also want to consider using scrypt (either via `standard library`_ or `cryptography`_) or argon2id via `argon2_cffi`_.
+
+Changelog
+=========
+
+3.1.7
+-----
+
+* Set a ``setuptools`` lower bound for PEP517 wheel building.
+* We no longer distribute 32-bit ``manylinux1`` wheels. Continuing to produce
+  them was a maintenance burden.
+
+3.1.6
+-----
+
+* Added support for compilation on Haiku.
+
+3.1.5
+-----
+
+* Added support for compilation on AIX.
+* Dropped Python 2.6 and 3.3 support.
+* Switched to using ``abi3`` wheels for Python 3. If you are not getting a
+  wheel on a compatible platform please upgrade your ``pip`` version.
+
+3.1.4
+-----
+
+* Fixed compilation with mingw and on illumos.
+
+3.1.3
+-----
+* Fixed a compilation issue on Solaris.
+* Added a warning when using too few rounds with ``kdf``.
+
+3.1.2
+-----
+* Fixed a compile issue affecting big endian platforms.
+* Fixed invalid escape sequence warnings on Python 3.6.
+* Fixed building in non-UTF8 environments on Python 2.
+
+3.1.1
+-----
+* Resolved a ``UserWarning`` when used with ``cffi`` 1.8.3.
+
+3.1.0
+-----
+* Added support for ``checkpw``, a convenience method for verifying a password.
+* Ensure that you get a ``$2y$`` hash when you input a ``$2y$`` salt.
+* Fixed a regression where ``$2a`` hashes were vulnerable to a wraparound bug.
+* Fixed compilation under Alpine Linux.
+
+3.0.0
+-----
+* Switched the C backend to code obtained from the OpenBSD project rather than
+  openwall.
+* Added support for ``bcrypt_pbkdf`` via the ``kdf`` function.
+
+2.0.0
+-----
+* Added support for an adjustible prefix when calling ``gensalt``.
+* Switched to CFFI 1.0+
+
+Usage
+-----
+
+Password Hashing
+~~~~~~~~~~~~~~~~
+
+Hashing and then later checking that a password matches the previous hashed
+password is very simple:
+
+.. code:: pycon
+
+    >>> import bcrypt
+    >>> password = b"super secret password"
+    >>> # Hash a password for the first time, with a randomly-generated salt
+    >>> hashed = bcrypt.hashpw(password, bcrypt.gensalt())
+    >>> # Check that an unhashed password matches one that has previously been
+    >>> # hashed
+    >>> if bcrypt.checkpw(password, hashed):
+    ...     print("It Matches!")
+    ... else:
+    ...     print("It Does not Match :(")
+
+KDF
+~~~
+
+As of 3.0.0 ``bcrypt`` now offers a ``kdf`` function which does ``bcrypt_pbkdf``.
+This KDF is used in OpenSSH's newer encrypted private key format.
+
+.. code:: pycon
+
+    >>> import bcrypt
+    >>> key = bcrypt.kdf(
+    ...     password=b'password',
+    ...     salt=b'salt',
+    ...     desired_key_bytes=32,
+    ...     rounds=100)
+
+
+Adjustable Work Factor
+~~~~~~~~~~~~~~~~~~~~~~
+One of bcrypt's features is an adjustable logarithmic work factor. To adjust
+the work factor merely pass the desired number of rounds to
+``bcrypt.gensalt(rounds=12)`` which defaults to 12):
+
+.. code:: pycon
+
+    >>> import bcrypt
+    >>> password = b"super secret password"
+    >>> # Hash a password for the first time, with a certain number of rounds
+    >>> hashed = bcrypt.hashpw(password, bcrypt.gensalt(14))
+    >>> # Check that a unhashed password matches one that has previously been
+    >>> #   hashed
+    >>> if bcrypt.checkpw(password, hashed):
+    ...     print("It Matches!")
+    ... else:
+    ...     print("It Does not Match :(")
+
+
+Adjustable Prefix
+~~~~~~~~~~~~~~~~~
+
+Another one of bcrypt's features is an adjustable prefix to let you define what
+libraries you'll remain compatible with. To adjust this, pass either ``2a`` or
+``2b`` (the default) to ``bcrypt.gensalt(prefix=b"2b")`` as a bytes object.
+
+As of 3.0.0 the ``$2y$`` prefix is still supported in ``hashpw`` but deprecated.
+
+Maximum Password Length
+~~~~~~~~~~~~~~~~~~~~~~~
+
+The bcrypt algorithm only handles passwords up to 72 characters, any characters
+beyond that are ignored. To work around this, a common approach is to hash a
+password with a cryptographic hash (such as ``sha256``) and then base64
+encode it to prevent NULL byte problems before hashing the result with
+``bcrypt``:
+
+.. code:: pycon
+
+    >>> password = b"an incredibly long password" * 10
+    >>> hashed = bcrypt.hashpw(
+    ...     base64.b64encode(hashlib.sha256(password).digest()),
+    ...     bcrypt.gensalt()
+    ... )
+
+Compatibility
+-------------
+
+This library should be compatible with py-bcrypt and it will run on Python
+2.7, 3.4+, and PyPy 2.6+.
+
+C Code
+------
+
+This library uses code from OpenBSD.
+
+Security
+--------
+
+``bcrypt`` follows the `same security policy as cryptography`_, if you
+identify a vulnerability, we ask you to contact us privately.
+
+.. _`same security policy as cryptography`: https://cryptography.io/en/latest/security/
+.. _`standard library`: https://docs.python.org/3/library/hashlib.html#hashlib.scrypt
+.. _`argon2_cffi`: https://argon2-cffi.readthedocs.io
+.. _`cryptography`: https://cryptography.io/en/latest/hazmat/primitives/key-derivation-functions/#cryptography.hazmat.primitives.kdf.scrypt.Scrypt
+
+

env/lib/python3.5/site-packages/bcrypt-3.1.7.dist-info/RECORD

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+bcrypt/__pycache__/__init__.cpython-35.pyc,,
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env/lib/python3.5/site-packages/bcrypt-3.1.7.dist-info/WHEEL

+Wheel-Version: 1.0
+Generator: bdist_wheel (0.33.4)
+Root-Is-Purelib: false
+Tag: cp35-cp35m-linux_armv7l
+

env/lib/python3.5/site-packages/bcrypt-3.1.7.dist-info/top_level.txt

+_bcrypt
+bcrypt

env/lib/python3.5/site-packages/bcrypt/__about__.py

+# Author:: Donald Stufft (<donald@stufft.io>)
+# Copyright:: Copyright (c) 2013 Donald Stufft
+# License:: Apache License, Version 2.0
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+from __future__ import absolute_import
+from __future__ import division
+from __future__ import unicode_literals
+
+__all__ = [
+    "__title__", "__summary__", "__uri__", "__version__", "__author__",
+    "__email__", "__license__", "__copyright__",
+]
+
+__title__ = "bcrypt"
+__summary__ = "Modern password hashing for your software and your servers"
+__uri__ = "https://github.com/pyca/bcrypt/"
+
+__version__ = "3.1.7"
+
+__author__ = "The Python Cryptographic Authority developers"
+__email__ = "cryptography-dev@python.org"
+
+__license__ = "Apache License, Version 2.0"
+__copyright__ = "Copyright 2013-2019 {0}".format(__author__)

env/lib/python3.5/site-packages/bcrypt/__init__.py

+# Author:: Donald Stufft (<donald@stufft.io>)
+# Copyright:: Copyright (c) 2013 Donald Stufft
+# License:: Apache License, Version 2.0
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+from __future__ import absolute_import
+from __future__ import division
+
+import os
+import re
+import warnings
+
+import six
+
+from . import _bcrypt
+from .__about__ import (
+    __author__, __copyright__, __email__, __license__, __summary__, __title__,
+    __uri__, __version__,
+)
+
+
+__all__ = [
+    "__title__", "__summary__", "__uri__", "__version__", "__author__",
+    "__email__", "__license__", "__copyright__",
+    "gensalt", "hashpw", "kdf", "checkpw",
+]
+
+
+_normalize_re = re.compile(br"^\$2y\$")
+
+
+def gensalt(rounds=12, prefix=b"2b"):
+    if prefix not in (b"2a", b"2b"):
+        raise ValueError("Supported prefixes are b'2a' or b'2b'")
+
+    if rounds < 4 or rounds > 31:
+        raise ValueError("Invalid rounds")
+
+    salt = os.urandom(16)
+    output = _bcrypt.ffi.new("char[]", 30)
+    _bcrypt.lib.encode_base64(output, salt, len(salt))
+
+    return (
+        b"$" + prefix + b"$" + ("%2.2u" % rounds).encode("ascii") + b"$" +
+        _bcrypt.ffi.string(output)
+    )
+
+
+def hashpw(password, salt):
+    if isinstance(password, six.text_type) or isinstance(salt, six.text_type):
+        raise TypeError("Unicode-objects must be encoded before hashing")
+
+    if b"\x00" in password:
+        raise ValueError("password may not contain NUL bytes")
+
+    # bcrypt originally suffered from a wraparound bug:
+    # http://www.openwall.com/lists/oss-security/2012/01/02/4
+    # This bug was corrected in the OpenBSD source by truncating inputs to 72
+    # bytes on the updated prefix $2b$, but leaving $2a$ unchanged for
+    # compatibility. However, pyca/bcrypt 2.0.0 *did* correctly truncate inputs
+    # on $2a$, so we do it here to preserve compatibility with 2.0.0
+    password = password[:72]
+
+    # When the original 8bit bug was found the original library we supported
+    # added a new prefix, $2y$, that fixes it. This prefix is exactly the same
+    # as the $2b$ prefix added by OpenBSD other than the name. Since the
+    # OpenBSD library does not support the $2y$ prefix, if the salt given to us
+    # is for the $2y$ prefix, we'll just mugne it so that it's a $2b$ prior to
+    # passing it into the C library.
+    original_salt, salt = salt, _normalize_re.sub(b"$2b$", salt)
+
+    hashed = _bcrypt.ffi.new("char[]", 128)
+    retval = _bcrypt.lib.bcrypt_hashpass(password, salt, hashed, len(hashed))
+
+    if retval != 0:
+        raise ValueError("Invalid salt")
+
+    # Now that we've gotten our hashed password, we want to ensure that the
+    # prefix we return is the one that was passed in, so we'll use the prefix
+    # from the original salt and concatenate that with the return value (minus
+    # the return value's prefix). This will ensure that if someone passed in a
+    # salt with a $2y$ prefix, that they get back a hash with a $2y$ prefix
+    # even though we munged it to $2b$.
+    return original_salt[:4] + _bcrypt.ffi.string(hashed)[4:]
+
+
+def checkpw(password, hashed_password):
+    if (isinstance(password, six.text_type) or
+            isinstance(hashed_password, six.text_type)):
+        raise TypeError("Unicode-objects must be encoded before checking")
+
+    if b"\x00" in password or b"\x00" in hashed_password:
+        raise ValueError(
+            "password and hashed_password may not contain NUL bytes"
+        )
+
+    ret = hashpw(password, hashed_password)
+
+    if len(ret) != len(hashed_password):
+        return False
+
+    return _bcrypt.lib.timingsafe_bcmp(ret, hashed_password, len(ret)) == 0
+
+
+def kdf(password, salt, desired_key_bytes, rounds, ignore_few_rounds=False):
+    if isinstance(password, six.text_type) or isinstance(salt, six.text_type):
+        raise TypeError("Unicode-objects must be encoded before hashing")
+
+    if len(password) == 0 or len(salt) == 0:
+        raise ValueError("password and salt must not be empty")
+
+    if desired_key_bytes <= 0 or desired_key_bytes > 512:
+        raise ValueError("desired_key_bytes must be 1-512")
+
+    if rounds < 1:
+        raise ValueError("rounds must be 1 or more")
+
+    if rounds < 50 and not ignore_few_rounds:
+        # They probably think bcrypt.kdf()'s rounds parameter is logarithmic,
+        # expecting this value to be slow enough (it probably would be if this
+        # were bcrypt). Emit a warning.
+        warnings.warn((
+            "Warning: bcrypt.kdf() called with only {0} round(s). "
+            "This few is not secure: the parameter is linear, like PBKDF2.")
+            .format(rounds),
+            UserWarning,
+            stacklevel=2,
+        )
+
+    key = _bcrypt.ffi.new("uint8_t[]", desired_key_bytes)
+    res = _bcrypt.lib.bcrypt_pbkdf(
+        password, len(password), salt, len(salt), key, len(key), rounds
+    )
+    _bcrypt_assert(res == 0)
+
+    return _bcrypt.ffi.buffer(key, desired_key_bytes)[:]
+
+
+def _bcrypt_assert(ok):
+    if not ok:
+        raise SystemError("bcrypt assertion failed")