challenge5.go

func repeatingXorMakeKey(key string, length int) string {
	ret := strings.Repeat(key, length/len(key)+1)
	return ret[0:length]
}

func repeatingKeyXor(clear string, key string) string {
	entryTab := strings.Split(clear, "\n")
	output := ""
	for i := 0; i < len(entryTab); i++ {
		repeatedKey := repeatingXorMakeKey(key, len(entryTab[i]))
		hexkey := fmt.Sprintf("%x", repeatedKey)
		hexclear := fmt.Sprintf("%x", entryTab[i])
		output += xor_equal_len(hexkey, hexclear)
		output += "\n"
	}
	return output
}