Example Key Derivation Function based on Pycrypto module

kdf.py

from binascii import unhexlify
from functools import partial
from Crypto.Protocol import KDF
from Crypto.Hash import SHA512, HMAC

_SALT = unhexlify('48B755AB80CD1C3DA61182D3DCD2E3A2CA869B783618FF6551FB4B0CDC3B8066')  # some salt
_KEY_LENGTH = 32

key_derivation_fn = partial(
    KDF.PBKDF2,
    salt=_SALT,
    dkLen=_KEY_LENGTH,
    count=5000,
    prf=lambda p,s: HMAC.new(p,s,SHA512).digest()
)