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# -*- coding: utf-8 -*-
# _scrypt.py
# Copyright (C) 2017 LEAP Encryption Access Project
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
try:
from cryptography.hazmat.backends.interfaces import ScryptBackend
from cryptography.hazmat.backends import default_backend
from cryptography.exceptions import UnsupportedAlgorithm
backend = default_backend()
OPENSSL_HAS_SCRYPT = isinstance(backend, ScryptBackend)
except ImportError:
OPENSSL_HAS_SCRYPT = False
def _fallback_hash(secret, salt, buflen=32):
import scrypt
return scrypt.hash(secret, salt, buflen=buflen)
if OPENSSL_HAS_SCRYPT:
from cryptography.hazmat.primitives.kdf.scrypt import Scrypt
def hash(secret, salt, buflen=32):
try:
_hash = Scrypt(
salt, buflen, 16384, 8, 1, backend).derive(secret)
except UnsupportedAlgorithm:
_hash = _fallback_hash(secret, salt, buflen)
return _hash
else:
hash = _fallback_hash
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