Encrypt Radius password in python3 - python-3.x

Question

I have used the following code in python2 to encrypt the Radius Password attribue:
def Encrypt_Pass(password, authenticator, secret):
m = md5()
m.update(secret + authenticator)
return "".join(chr(ord(x) ^ ord(y)) for x, y in zip(password.ljust(16, '\0')[:16], m.digest()[:16]))
That does not work in python3, error for m.update line:
TypeError: Unicode-objects must be encoded before hashing
After i do add encoding:
def Encrypt_Pass(password, authenticator, secret):
m = md5()
m.update(secret.encode('ascii') + authenticator.encode('ascii'))
return "".join(chr(ord(x) ^ ord(y)) for x, y in zip(password.ljust(16, '\0')[:16], m.digest()[:16]))
I do still fail with:
TypeError: ord() expected string of length 1, but int found
Now i am lost and forget the details of the algorithm, are you able to help ? How to change that last line to work with python3 ? (working perfectly fine for python2).
Update: I've did troubleshooting, with the code like this:
m = md5()
m.update(secret.encode('ascii') + authenticator.encode('ascii'))
print("Secret {}, encode {}".format(secret,secret.encode('ascii')))
print("auth {}, encode {}".format(authenticator, authenticator.encode('ascii')))
print("m digest: {}".format(m.digest()[:16]))
print("passwd: {}".format(password.ljust(16, '\0')[:16]))
#return "".join(chr(ord(x) ^ y) for x, y in zip(password.ljust(16, '\0')[:16], m.digest()[:16]))
for x, y in zip(password.ljust(16, '\0')[:16], m.digest()[:16]):
print("JOIN ord x: {} y: {}".format(ord(x),y))
a = "".join(chr(ord(x) ^ y))
print("a: {}".format(chr(ord(x) ^ y)))
i got:
Secret cisco, encode b'cisco'
auth 5002CVWVKCX13QTN, encode b'5002CVWVKCX13QTN'
m digest: b'\xf8\xb9\xc2\x1foZ~h\xff#,\x87\x07\xcc:m'
passwd: cisco
JOIN ord x: 99 y: 248
a:
JOIN ord x: 105 y: 185
a: Ð
JOIN ord x: 115 y: 194
a: ±
JOIN ord x: 99 y: 31
a: |
JOIN ord x: 111 y: 111
a:
JOIN ord x: 0 y: 90
a: Z
JOIN ord x: 0 y: 126
a: ~
JOIN ord x: 0 y: 104
a: h
JOIN ord x: 0 y: 255
a: ÿ
JOIN ord x: 0 y: 64
a: #
JOIN ord x: 0 y: 44
a: ,
JOIN ord x: 0 y: 135
a:
JOIN ord x: 0 y: 7
a:
JOIN ord x: 0 y: 204
a: Ì
JOIN ord x: 0 y: 58
a: :
JOIN ord x: 0 y: 109
a: m
So it looks like instead of ord(y) i just have to use y ? But even with that password is still encoded incorrectly with python3 :(