Comments on: Django Encryption – An Updated How-To

By: shay

shay — Mon, 12 Sep 2011 12:08:45 +0000

Thanks, very helpful.
I just added multi laguage support

def to_python(self, value):
if self._is_encrypted(value):
return self.cipher.decrypt(binascii.a2b_hex(value[len(self.prefix):])).split(”)[0].decode(‘utf8′)
return value

def get_db_prep_value(self, value, connection, prepared=False):
if value is not None and not self._is_encrypted(value):
value = value.encode(‘utf8′)
padding = self._get_padding(value)
if padding > 0:
value += “” + ”.join([random.choice(string.printable) for index in range(padding - 1)])
value = self.prefix + binascii.b2a_hex(self.cipher.encrypt(value))
return value

By: Arkaitz

Arkaitz — Thu, 08 Sep 2011 09:42:57 +0000

Hi,
I’m trying hard to implement your snipped but using initialization vector. I have no problem on declaring iv into __init__, but the problem seems to come when decrypting: I use a randomized iv, so each db entry has its own iv, and I include it after the prefix. I think that I’m doing it well when extracting iv from the data (value), but it fails to decrypt. I think that it can be caused by the fact that cipher is declared in __init__, and in your example is basically the same every time it’s called. So, how can I fix it?

By: Rodrigo Abreu

Rodrigo Abreu — Sun, 10 Apr 2011 18:47:07 +0000

I tried adapting it for FileField’s but it didn’t work. How would you do it?

Thanks.

By: Shay

Shay — Mon, 26 Jul 2010 10:40:21 +0000

my bad I was using PasswordInput widget with render_value=False

By: Shay

Shay — Mon, 26 Jul 2010 08:42:48 +0000

Thanks Bryan, however django always ask to renter this filed when saving my admin form. can’t it ignore the field when no new data is typed in?