docs: def from_credentials(cls: Type[SigningKeyType], salt: Union[str, bytes], password: Union[str, bytes],
                           scrypt_params: Optional[ScryptParams] = None) -> SigningKeyType:
          """
          Create a SigningKey object from credentials
  
          :param salt: Secret salt passphrase credential
          :param password: Secret password credential
          :param scrypt_params: ScryptParams instance
          """
          if scrypt_params is None:
              scrypt_params = ScryptParams()
  
          salt = ensure_bytes(salt)
          password = ensure_bytes(password)
          seed = scrypt(password, salt, scrypt_params.N, scrypt_params.r, scrypt_params.p, scrypt_params.seed_length)
  
          return cls(seed)