try:

    import cPickle as pickle

except ImportError:

    import pickle

from django.conf import settings

from django.utils.hashcompat import md5_constructor

from django.forms import BooleanField

def security_hash(request, form, *args):

    """

    Calculates a security hash for the given Form instance.

    This creates a list of the form field names/values in a deterministic

    order, pickles the result with the SECRET_KEY setting, then takes an md5

    hash of that.

    """

    data = [(bf.name, bf.field.clean(bf.data) or '') for bf in form]

    data.extend(args)

    data.append(settings.SECRET_KEY)

    # Use HIGHEST_PROTOCOL because it's the most efficient. It requires

    # Python 2.3, but Django requires 2.3 anyway, so that's OK.

    pickled = pickle.dumps(data, pickle.HIGHEST_PROTOCOL)

    return md5_constructor(pickled).hexdigest()