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# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
# implied.
# See the License for the specific language governing permissions and
# limitations under the License.
from __future__ import absolute_import, division, print_function
import platform
import sys
from cryptography.hazmat.bindings.utils import build_ffi
class Binding(object):
"""
CommonCrypto API wrapper.
"""
_module_prefix = "cryptography.hazmat.bindings.commoncrypto."
_modules = [
"common_digest",
"common_hmac",
"common_key_derivation",
"common_cryptor",
]
ffi = None
lib = None
def __init__(self):
self._ensure_ffi_initialized()
@classmethod
def _ensure_ffi_initialized(cls):
if cls.ffi is not None and cls.lib is not None:
return
cls.ffi, cls.lib = build_ffi(
module_prefix=cls._module_prefix,
modules=cls._modules,
)
@classmethod
def is_available(cls):
return sys.platform == "darwin" and list(map(
int, platform.mac_ver()[0].split("."))) >= [10, 8, 0]
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