Function Luhn

checksum/luhn.go:13–30

Luhn validates the provided data using the Luhn algorithm.

(s []byte)

// Luhn validates the provided data using the Luhn algorithm.
func Luhn(s []byte) bool {
	n := len(s)
	number := 0
	result := 0
	for i := 0; i < n; i++ {
		number = int(s[i]) - '0'
		if i%2 != 0 {
			result += number
			continue
		}
		number *= 2
		if number > 9 {
			number -= 9
		}
		result += number
	}
	return result%10 == 0
}