ParagonIE_Sodium_Core_ChaCha20_Ctx::initCounter( string $ctr ): string

127    public function initCounter(128        #[SensitiveParameter]129        $ctr130    ) {131        $len = self::strlen($ctr);132        if ($len === 0) {133            return str_repeat("\0", 8);134        }135        if ($len < 8) {136            return $ctr . str_repeat("\0", 8 - $len);137        }138        if ($len > 8) {139            throw new SodiumException("counter cannot be more than 8 bytes");140        }141        return $ctr;142    }