Storyden

package otp import ( "crypto/rand" "fmt" "math" "github.com/Southclaws/fault" ) func Generate() (string, error) { sum := make([]byte, 6) _, err := rand.Read(sum) if err != nil { return "", fault.Wrap(err) } value := int64(((int(sum[0]) & 0x7f) << 24) | ((int(sum[1] & 0xff)) << 16) | ((int(sum[2] & 0xff)) << 8) | (int(sum[3]) & 0xff)) mod := int32(value % int64(math.Pow10(6))) return fmt.Sprintf("%06d", mod), nil }