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per http://tools.ietf.org/html/rfc6238 floor function needs to be used h... #2

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per http://tools.ietf.org/html/rfc6238 floor function needs to be used h... #2

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2 changes: 1 addition & 1 deletion gototp.go
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Original file line number Diff line number Diff line change
Expand Up @@ -56,7 +56,7 @@ func (totp *TOTP) Now() int32 {
// will be valid in the next period (FromNow(1)).
// This means that every code is therefore valid for 3 * totp.Period.
func (totp *TOTP) FromNow(periods int64) int32 {
period := (time.Now().Unix() / int64(totp.Period)) + int64(periods)
period := math.Floor(time.Now().Unix() / int64(totp.Period)) + int64(periods)
return totp.ForPeriod(period)
}

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