LoadData will read input from specified file or stdin if file name is '-'.

PrintJSON will print a json object as an indendent or not JSON string.

func SignToken(rawToken []byte, Alg string, Head ArgList, claims jwt.MapClaims, keyData []byte) (err error) { keyData is the private key if EC/RS etc.

xtoken, err := jwtlib.VerifyToken ( tokData , Alg, PublicKey ) if ES*, PS*, RS*, Ed25519 - then key is the public key.