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"""
CFFI based implementation of the _crypt module
"""
import sys
import cffi
import _thread
_lock = _thread.allocate_lock()
try: from __pypy__ import builtinify
except ImportError: builtinify = lambda f: f
if sys.platform == 'win32':
raise ImportError("The crypt module is not supported on Windows")
ffi = cffi.FFI()
ffi.cdef('char *crypt(char *word, char *salt);')
try:
lib = ffi.dlopen('crypt')
except OSError:
raise ModuleNotFoundError('crypt not available', name='crypt')
@builtinify
def crypt(word, salt):
# Both arguments must be str on CPython, but are interpreted as
# utf-8 bytes. The result is also a str. For backward
# compatibility with previous versions of the logic here
# we also accept directly bytes (and then return bytes).
with _lock:
arg_is_str = isinstance(word, str)
if arg_is_str:
word = word.encode('utf-8')
if isinstance(salt, str):
salt = salt.encode('utf-8')
res = lib.crypt(word, salt)
if not res:
return None
res = ffi.string(res)
if arg_is_str:
res = res.decode('utf-8')
return res
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