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Update hashing_passwords to use hashlib and remove pbkdf2

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This commit is contained in:
JonnyWong16 2019-11-24 15:49:17 -08:00
parent 121dad588e
commit 169f83ac4a
2 changed files with 7 additions and 142 deletions
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19
lib/hashing_passwords.py
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@ -19,10 +19,7 @@
import hashlib
from os import urandom
from base64 import b64encode, b64decode
# From https://github.com/mitsuhiko/python-pbkdf2
from pbkdf2 import pbkdf2_bin
from hashlib import pbkdf2_hmac
# Parameters to PBKDF2. Only affect new passwords.
@ -43,9 +40,8 @@ def make_hash(password):
return 'PBKDF2${}${}${}${}'.format(
HASH_FUNCTION,
COST_FACTOR,
salt,
b64encode(pbkdf2_bin(password, salt, COST_FACTOR, KEY_LENGTH,
getattr(hashlib, HASH_FUNCTION))))
salt.decode('utf-8'),
b64encode(pbkdf2_hmac(HASH_FUNCTION, password, salt, COST_FACTOR, KEY_LENGTH)).decode('utf-8'))
def check_hash(password, hash_):
@ -54,13 +50,12 @@ def check_hash(password, hash_):
password = password.encode('utf-8')
algorithm, hash_function, cost_factor, salt, hash_a = hash_.split('$')
assert algorithm == 'PBKDF2'
hash_a = b64decode(hash_a)
hash_b = pbkdf2_bin(password, salt, int(cost_factor), len(hash_a),
getattr(hashlib, hash_function))
hash_a = b64decode(hash_a.encode('utf-8'))
hash_b = pbkdf2_hmac(hash_function, password, salt.encode('utf-8'), int(cost_factor), len(hash_a))
assert len(hash_a) == len(hash_b) # we requested this from pbkdf2_bin()
# Same as "return hash_a == hash_b" but takes a constant time.
# See http://carlos.bueno.org/2011/10/timing.html
diff = 0
for char_a, char_b in zip(hash_a, hash_b):
diff |= ord(char_a) ^ ord(char_b)
return diff == 0
diff |= char_a ^ char_b
return diff == 0