def test_determine_bcrypt_cost():
bcrypt = _import_bcrypt()
if bcrypt is None:
with pytest.raises(RuntimeError):
determine_bcrypt_cost(8, 0.1)
else:
assert determine_bcrypt_cost(8, 0.1) > 0
"""
import os
import hmac
import inspect
import hashlib
import warnings
from binascii import hexlify, unhexlify
from collections import OrderedDict
from pwhash.algorithms import pbkdf2
from pwhash.utils import (
constant_time_equal, classproperty, _import_bcrypt, get_root_path,
text_type, native_to_bytes, bytes_to_native, int_to_bytes
)
bcrypt = _import_bcrypt()
DIGEST_SIZES = {
"hmac-sha1": 20,
"hmac-sha224": 28,
"hmac-sha256": 32,
"hmac-sha384": 48,
"hmac-sha512": 64
}
#: The recommended minimum salt length as specified in the `NIST Special
#: Publication 800-132`_, published in December of 2010.
#:
#: .. _NIST Special Publication 800-132: http://csrc.nist.gov/publications/nistpubs/800-132/nist-sp800-132.pdf
RECOMMENDED_MIN_SALT_LENGTH = 16 # 128 bit