func NewCookieSigner(key []byte) CookieSigner {
	return CookieSigner{signer: hmac.New(sha256.New, key)}
}
func NewCookieSigner(key []byte) CookieSigner {
	return CookieSigner{signer: hmac.New(sha256.New, key)}
}
func NewCookieSigner ( key [ ] byte ) CookieSigner { return CookieSigner { signer : hmac . New ( sha256 . New , key ) } }
// NewCookieSigner returns a new CookieSigner using the given key
NewCookieSigner returns a new CookieSigner using the given key