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import hashlib
# Calculate a non-truncated Drupal 7 compatible password hash.
# The consumer of these hashes must truncate correctly.
class DrupalHash:
def __init__(self, stored_hash, password):
self.itoa64 = './0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz'
self.last_hash = self.rehash(stored_hash, password)
def get_hash(self):
return self.last_hash
def password_get_count_log2(self, setting):
return self.itoa64.index(setting[3])
def password_crypt(self, algo, password, setting):
setting = setting[0:12]
if setting[0] != '$' or setting[2] != '$':
return False
count_log2 = self.password_get_count_log2(setting)
salt = setting[4:12]
if len(salt) < 8:
return False
count = 1 << count_log2
if algo == 'md5':
hash_func = hashlib.md5
elif algo == 'sha512':
hash_func = hashlib.sha512
else:
return False
hash_str = hash_func(salt + password).digest()
for c in range(count):
hash_str = hash_func(hash_str + password).digest()
output = setting + self.custom64(hash_str)
return output
def custom64(self, string, count = 0):
if count == 0:
count = len(string)
output = ''
i = 0
itoa64 = self.itoa64
while 1:
value = ord(string[i])
i += 1
output += itoa64[value & 0x3f]
if i < count:
value |= ord(string[i]) << 8
output += itoa64[(value >> 6) & 0x3f]
if i >= count:
break
i += 1
if i < count:
value |= ord(string[i]) << 16
output += itoa64[(value >> 12) & 0x3f]
if i >= count:
break
i += 1
output += itoa64[(value >> 18) & 0x3f]
if i >= count:
break
return output
def rehash(self, stored_hash, password):
# Drupal 6 compatibility
if len(stored_hash) == 32 and stored_hash.find('$') == -1:
return hashlib.md5(password).hexdigest()
# Drupal 7
if stored_hash[0:2] == 'U$':
stored_hash = stored_hash[1:]
password = hashlib.md5(password).hexdigest()
hash_type = stored_hash[0:3]
if hash_type == '$S$':
hash_str = self.password_crypt('sha512', password, stored_hash)
elif hash_type == '$H$' or hash_type == '$P$':
hash_str = self.password_crypt('md5', password, stored_hash)
else:
hash_str = False
return hash_str
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