=========================
Key Management Facilities
=========================

The default key managment facility implements the
``IExtendedKeyManagementFacility``. This interface extends ``IMapping`` so
that the entire mapping interface is supported

  >>> import tempfile
  >>> from keas.kmi import facility
  >>> kmf = facility.KeyManagementFacility(tempfile.mkdtemp())

  >>> key1 = kmf.generate()
  >>> key2 = kmf.generate()
  >>> key3 = kmf.generate()

There should be 3 keys now:

  >>> len(kmf)
  3

And their hash values are the keys of the map:

  >>> kmf.keys()
  ['...', '...', '...']
  >>> list(iter(kmf))
  ['...', '...', '...']

Now let's get one key:

  >>> hash = kmf.keys()[0]
  >>> len(kmf[hash])
  64

  >>> len(kmf.get(hash))
  64
  >>> kmf.get('xyz', 'default')
  'default'

We can also check whether a hash is int he facility:

  >>> hash in kmf
  True
  >>> 'xyz' in hash
  False

Of course you can get values and items as well:

  >>> len(kmf.values())
  3
  >>> len(kmf.items())
  3

Finally, one can delete keys using their hash as well.

  >>> del kmf[hash]
  >>> len(kmf)
  2
