Merge pull request #1132 from exploide/md4

Import MD4 from pycryptodomex package

ldap3/utils/ntlm.py

@@ -512,15 +512,8 @@ def ntowf_v2(self):
             # The specified password is an LM:NTLM hash
             password_digest = binascii.unhexlify(passparts[1])
         else:
-            try:
-                password_digest = hashlib.new('MD4', self._password.encode('utf-16-le')).digest()
-            except ValueError as e:
-                try:
-                    from Crypto.Hash import MD4  # try with the Crypto library if present
-                    password_digest = MD4.new(self._password.encode('utf-16-le')).digest()
-                except ImportError:
-                    raise e  # raise original exception
-
+            from Cryptodome.Hash import MD4
+            password_digest = MD4.new(self._password.encode('utf-16-le')).digest()
         return hmac.new(password_digest, (self.user_name.upper() + self.user_domain).encode('utf-16-le'), digestmod=hashlib.md5).digest()
 
     def _kxkey(self, response_key_nt, nt_proof_str):
@@ -565,4 +558,4 @@ def unseal(self, sealed_message):
         calculated_signature = self.sign(message, sealed_message[12:16], SERVER)
         if calculated_signature != sealed_message[:16]:
             raise LDAPSignatureVerificationFailedError("Signature verification failed for the received LDAP message number " + str(self.sequence_number) + ". Expected signature " + sealed_message[:16].hex() + " but got " + calculated_signature.hex() + ".")
-        return message
+        return message