Function ValidateCustom

hotp/hotp.go:149–166

ValidateCustom validates an HOTP with customizable options. Most users should use Validate().

(passcode string, counter uint64, secret string, opts ValidateOpts)

// ValidateCustom validates an HOTP with customizable options. Most users should
// use Validate().
func ValidateCustom(passcode string, counter uint64, secret string, opts ValidateOpts) (bool, error) {
	passcode = strings.TrimSpace(passcode)

	if len(passcode) != opts.Digits.Length() {
		return false, otp.ErrValidateInputInvalidLength
	}

	otpstr, err := GenerateCodeCustom(secret, counter, opts)
	if err != nil {
		return false, err
	}

	if subtle.ConstantTimeCompare([]byte(otpstr), []byte(passcode)) == 1 {
		return true, nil
	}

	return false, nil
}

// GenerateOpts provides options for .Generate()
type GenerateOpts struct {