Validate actual key length in ChaCha

Author: JeremiahM37

wolfcrypt/ciphers.py

@@ -498,10 +498,11 @@ def __init__(self, key="", size=32):
             self._dec = None
             self._key = None
             if len(key) > 0:
-                if not size in self._key_sizes:
-                    raise ValueError("Invalid key size %d" % size)
                 self._key = t2b(key)
-                self.key_size = size
+                if len(self._key) not in self._key_sizes:
+                    raise ValueError("key must be %s in length, not %d" %
+                                     (self._key_sizes, len(self._key)))
+                self.key_size = len(self._key)
             self._IV_nonce = []
             self._IV_counter = 0