A place to keep your valuables.

Locker makes it easy to securely store data in a key:value scheme on a hard drive.
Locker is only compatible with Python 3 and upwards and requires the cryptography library.

Locker is now on PyPi.org! Install with:

pip install python-locker

Each locker represents a storage space (file) encrypted using a separate password. To get started, just import the Locker class:

>>> from locker import Locker

Assuming you don't have a locker yet, create a new one with Locker.create_locker.
Be sure to pass a bytes object as the password argument.

>>> Locker.create_locker(
...     path="foo",
...     password=b"bar"
... )

Now that your locker has been created, you can load it:

>>> locker = Locker(
...     path="foo",
...     password=b"bar"
... )

To open the locker and decrypt its contents, call Locker.open.
To demonstrate what happens when you enter a wrong password, let's modify the password attribute:

>>> locker.password
b'bar'
>>> locker.password = b'spam'
>>> locker.open()
Traceback (most recent call last):
...
cryptography.exceptions.InvalidKey: invalid password provided

As you can see, a cryptography.exceptions.InvalidKey exception is raised.
Let's restore the original password and try opening the locker again:

>>> locker.password = b'foo'
>>> locker.open()

The open call should return with no traceback.

With the locker being opened, let's take a look at its contents:

>>> locker.contents
{}

Our locker is empty, but we can change that.
You can manually add key:value entries to the locker, or use the convenient get, set and delete methods:

>>> locker.set(b"foo", b"bar")
>>> locker.get(b"foo")
b'bar'
>>> locker.delete(b"foo")
>>> locker.get(b"foo")
Traceback (most recent call last):
...
KeyError: "key b'foo' not in locker"

Note especially how all key:value pairs are bytes objects.

To save any changes you made, call close:

>>> locker.close()

Don't forget to call this method after you're done modifying a locker, or your changes will be discarded.