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add example of using password callback #21

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add example of using password callback #21

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1aee33f
add example of using password callback
JacobBarthelmeh Jul 14, 2021
adac2b9
try to convert a string to byte for python3
JacobBarthelmeh Jul 16, 2021
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9 changes: 9 additions & 0 deletions examples/client.py
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Original file line number Diff line number Diff line change
Expand Up @@ -100,6 +100,14 @@ def get_method(index):
)[index]


# Callback for wolfssl/certs/client-keyEnc.pem (yassl123 password)
# sz is the max size of password allowed
# rw is type i.e PEM_PASS_READ
# userdata is a void pointer potentially set by user
def password_cb(sz, rw, userdata):
return "yassl123"


def main():
args = build_arg_parser().parse_args()

Expand All @@ -110,6 +118,7 @@ def main():

context = wolfssl.SSLContext(get_method(args.v))

context.set_passwd_cb(password_cb)
context.load_cert_chain(args.c, args.k)

if args.d:
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8 changes: 8 additions & 0 deletions src/wolfssl/__init__.py
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Original file line number Diff line number Diff line change
Expand Up @@ -942,6 +942,14 @@ def callback(self):
def _get_passwd(self, passwd, sz, rw, userdata):
try:
result = self._passwd_wrapper(sz, rw, userdata)

# if the result returned is a string then try to convert it
try:
if isinstance(result, str):
result = str.encode(result)
except Exception as e:
pass

if not isinstance(result, bytes):
raise ValueError("Problem, expected String, not bytes")
if len(result) > sz:
Expand Down