def _is_equal(b_a, b_b):
"""
Comparing 2 byte arrrays in constant time
to avoid timing attacks.
It would be nice if there was a library for this but
hey.
"""
if not (isinstance(b_a, binary_type) and isinstance(b_b, binary_type)):
raise TypeError('_is_equal can only be used to compare two byte strings')
# http://codahale.com/a-lesson-in-timing-attacks/
if len(b_a) != len(b_b):
return False
result = 0
for b_x, b_y in zip(b_a, b_b):
if PY3:
result |= b_x ^ b_y
else:
result |= ord(b_x) ^ ord(b_y)
return result == 0
def _is_equal(b_a, b_b):
"""
Comparing 2 byte arrrays in constant time
to avoid timing attacks.
It would be nice if there was a library for this but
hey.
"""
if not (isinstance(b_a, binary_type) and isinstance(b_b, binary_type)):
raise TypeError('_is_equal can only be used to compare two byte strings')
# http://codahale.com/a-lesson-in-timing-attacks/
if len(b_a) != len(b_b):
return False
result = 0
for b_x, b_y in zip(b_a, b_b):
if PY3:
result |= b_x ^ b_y
else:
result |= ord(b_x) ^ ord(b_y)
return result == 0
