Added jwk and x5c as allowed JWS header argument.

Author: rohe

src/cryptojwt/jws/jws.py

@@ -118,7 +118,7 @@ def sign_compact(self, keys=None, protected=None, **kwargs):
 
         key, xargs, _alg = self.alg_keys(keys, "sig", protected)
 
-        for param in ['typ', "trust_chain"]:
+        for param in ['typ', "trust_chain", "jwk", "x5c"]:
             if param in self:
                 xargs[param] = self[param]
 

src/cryptojwt/jwt.py

@@ -90,7 +90,7 @@ def __init__(
             encrypt: bool = False,
             enc_enc: str = "A128GCM",
             enc_alg: str = "RSA-OAEP-256",
-            msg_cls: MutableMapping = None,
+            msg_cls: Optional[MutableMapping] = None,
             iss2msg_cls: Dict[str, str] = None,
             skew: int = 15,
             allowed_sign_algs: List[str] = None,