Created
April 9, 2012 15:44
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Django password hasher for migration from Drupal
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""" | |
DrupalPasswordHasher | |
To use, put this in any app and add to your settings.py, something like this: | |
PASSWORD_HASHERS = ( | |
'django.contrib.auth.hashers.PBKDF2PasswordHasher', | |
'myproject.myapp.drupal_hasher.DrupalPasswordHasher', | |
'django.contrib.auth.hashers.PBKDF2SHA1PasswordHasher', | |
'django.contrib.auth.hashers.BCryptPasswordHasher', | |
'django.contrib.auth.hashers.SHA1PasswordHasher', | |
'django.contrib.auth.hashers.MD5PasswordHasher', | |
'django.contrib.auth.hashers.CryptPasswordHasher', | |
) | |
Three notes: | |
-This requires Drupal 1.4 or higher (with the introduction of the flexible password | |
hasher) | |
-In Drupal, the number of algorithm iterations is a power of 2, | |
which is represented by the first character after the $. Specifically, it | |
performs 2^(index within _ITOA64) iterations, such that 'C' represents 2^14 | |
and 'D' would represent 2^15. | |
-In Drupal the passwords are stored as: | |
$S$<hash> | |
while in Django the passwords are stored as | |
S$<hash> | |
So you must cut off the first character of each password when migrating. | |
""" | |
import hashlib | |
from django.contrib.auth.hashers import BasePasswordHasher | |
_ITOA64 = './0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz' | |
class DrupalPasswordHasher(BasePasswordHasher): | |
algorithm = "S" | |
iter_code = 'C' | |
salt_length = 8 | |
def encode(self, password, salt, iter_code=None): | |
"""The Drupal 7 method of encoding passwords""" | |
if iter_code == None: | |
iterations = 2 ** _ITOA64.index(self.iter_code) | |
else: | |
iterations = 2 ** _ITOA64.index(iter_code) | |
hash = hashlib.sha512(salt + password).digest() | |
for i in range(iterations): | |
hash = hashlib.sha512(hash + password).digest() | |
l = len(hash) | |
output = '' | |
i = 0 | |
while i < l: | |
value = ord(hash[i]) | |
i = i + 1 | |
output += _ITOA64[value & 0x3f] | |
if i < l: | |
value |= ord(hash[i]) << 8 | |
output += _ITOA64[(value >> 6) & 0x3f] | |
if i >= l: | |
break | |
i += 1 | |
if i < l: | |
value |= ord(hash[i]) << 16 | |
output += _ITOA64[(value >> 12) & 0x3f] | |
if i >= l: | |
break | |
i += 1 | |
output += _ITOA64[(value >> 18) & 0x3f] | |
longhashed = "%s$%s%s%s" % (self.algorithm, iter_code, | |
salt, output) | |
return longhashed[:54] | |
def verify(self, password, encoded): | |
hash = encoded.split("$")[1] | |
iter_code = hash[0] | |
salt = hash[1:1 + self.salt_length] | |
return encoded == self.encode(password, salt, iter_code) |
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Hi! I really need to use this snippet but as a newbie to django have no clue how to implement it. I appreciate if you add a brief docs. Thanks.