Incorrect padding error #25
Description
I have an EncryptedCharField, max length is 64. If I try to set it to 'ElderslooŰŰŰ', I get Incorrect padding error. But if I set it to 'ElderslooŰŰŰŰ' (one Ű more) then it's ok. It can be invoked simply in django admin.
I looked around in the code (fields.py):
def to_python(self, value):
if value is None or not isinstance(value, str):
return value
if self.prefix and value.startswith(self.prefix):
value = value[len(self.prefix):]
try:
value = self.crypter().decrypt(value)
#value = value.decode('unicode_escape')
except keyczar.errors.KeyczarError:
pass
except UnicodeEncodeError:
pass
return super(EncryptedFieldMixin, self).to_python(value)
to_python is called either from 'from_db_value', or from 'clean'. When it gets called from 'clean' the value is not encoded at all, so there is no reason to call 'value = self.crypter().decrypt(value)'. I'm not familiar with django forms code, so I can't judge why it works this way. Since decryption is not needed, silencing the exception works fine, like this way:
try:
value = self.crypter().decrypt(value)
#value = value.decode('unicode_escape')
except keyczar.errors.KeyczarError:
pass
except UnicodeEncodeError:
pass
except binascii.Error:
pass
I use django-encrypted-fields-python3==1.1.3 and django 1.8.