Automatic switch to internal backend on missing PyCA module

This commit is contained in:
Mark Qvist 2022-06-08 21:25:46 +02:00
parent 60e3c7348a
commit 7916b8e7f4
2 changed files with 36 additions and 2 deletions

View File

@ -1,5 +1,38 @@
import importlib
PROVIDER_NONE = 0x00
PROVIDER_INTERNAL = 0x01
PROVIDER_PYCA = 0x02
PROVIDER = PROVIDER_NONE
pyca_v = None
use_pyca = False
try:
if importlib.util.find_spec('cryptography') != None:
import cryptography
pyca_v = cryptography.__version__
v = pyca_v.split(".")
if int(v[0]) == 2:
if int(v[1]) >= 8:
use_pyca = True
elif int(v[0]) >= 3:
use_pyca = True
except Exception as e:
pass
if use_pyca:
PROVIDER = PROVIDER_PYCA
# PROVIDER = PROVIDER_INTERNAL
else:
PROVIDER = PROVIDER_INTERNAL
def backend():
if PROVIDER == PROVIDER_NONE:
return "none"
elif PROVIDER == PROVIDER_INTERNAL:
return "internal"
elif PROVIDER == PROVIDER_PYCA:
return "openssl, PyCA "+str(pyca_v)

View File

@ -6,6 +6,7 @@ from .Hashes import sha512
from .HKDF import hkdf
from .PKCS7 import PKCS7
from .Fernet import Fernet
from .Provider import backend
import RNS.Cryptography.Provider as cp