user/crypt/crypt.go
func New(c Crypt) Crypter {
	f := crypts[c]
	if f != nil {
		return f()
	}
	panic("crypt: requested crypt function is unavailable")
}
func New(c Crypt) Crypter {
	f := crypts[c]
	if f != nil {
		return f()
	}
	panic("crypt: requested crypt function is unavailable")
}
// New returns a new crypter.