ParagonIE_Sodium_Core32_Poly1305_State::finish(): string

337    public function finish()338    {339        /* process the remaining block */340        if ($this->leftover) {341            $i = $this->leftover;342            $this->buffer[$i++] = 1;343            for (; $i < ParagonIE_Sodium_Core32_Poly1305::BLOCK_SIZE; ++$i) {344                $this->buffer[$i] = 0;345            }346            $this->final = true;347            $this->blocks(348                self::substr(349                    self::intArrayToString($this->buffer),350                    0,351                    ParagonIE_Sodium_Core32_Poly1305::BLOCK_SIZE352                ),353                $b = ParagonIE_Sodium_Core32_Poly1305::BLOCK_SIZE354            );355        }356 357        /**358         * @var ParagonIE_Sodium_Core32_Int32 $f359         * @var ParagonIE_Sodium_Core32_Int32 $g0360         * @var ParagonIE_Sodium_Core32_Int32 $g1361         * @var ParagonIE_Sodium_Core32_Int32 $g2362         * @var ParagonIE_Sodium_Core32_Int32 $g3363         * @var ParagonIE_Sodium_Core32_Int32 $g4364         * @var ParagonIE_Sodium_Core32_Int32 $h0365         * @var ParagonIE_Sodium_Core32_Int32 $h1366         * @var ParagonIE_Sodium_Core32_Int32 $h2367         * @var ParagonIE_Sodium_Core32_Int32 $h3368         * @var ParagonIE_Sodium_Core32_Int32 $h4369         */370        $h0 = $this->h[0];371        $h1 = $this->h[1];372        $h2 = $this->h[2];373        $h3 = $this->h[3];374        $h4 = $this->h[4];375 376        $c = $h1->shiftRight(26);           # $c = $h1 >> 26;377        $h1 = $h1->mask(0x3ffffff);         # $h1 &= 0x3ffffff;378 379        $h2 = $h2->addInt32($c);            # $h2 += $c;380        $c = $h2->shiftRight(26);           # $c = $h2 >> 26;381        $h2 = $h2->mask(0x3ffffff);         # $h2 &= 0x3ffffff;382 383        $h3 = $h3->addInt32($c);            # $h3 += $c;384        $c = $h3->shiftRight(26);           # $c = $h3 >> 26;385        $h3 = $h3->mask(0x3ffffff);         # $h3 &= 0x3ffffff;386 387        $h4 = $h4->addInt32($c);            # $h4 += $c;388        $c = $h4->shiftRight(26);           # $c = $h4 >> 26;389        $h4 = $h4->mask(0x3ffffff);         # $h4 &= 0x3ffffff;390 391        $h0 = $h0->addInt32($c->mulInt(5, 3)); # $h0 += self::mul($c, 5);392        $c = $h0->shiftRight(26);           # $c = $h0 >> 26;393        $h0 = $h0->mask(0x3ffffff);         # $h0 &= 0x3ffffff;394        $h1 = $h1->addInt32($c);            # $h1 += $c;395 396        /* compute h + -p */397        $g0 = $h0->addInt(5);398        $c  = $g0->shiftRight(26);399        $g0 = $g0->mask(0x3ffffff);400        $g1 = $h1->addInt32($c);401        $c  = $g1->shiftRight(26);402        $g1 = $g1->mask(0x3ffffff);403        $g2 = $h2->addInt32($c);404        $c  = $g2->shiftRight(26);405        $g2 = $g2->mask(0x3ffffff);406        $g3 = $h3->addInt32($c);407        $c  = $g3->shiftRight(26);408        $g3 = $g3->mask(0x3ffffff);409        $g4 = $h4->addInt32($c)->subInt(1 << 26);410 411        # $mask = ($g4 >> 31) - 1;412        /* select h if h < p, or h + -p if h >= p */413        $mask = (int) (($g4->toInt() >> 31) + 1);414 415        $g0 = $g0->mask($mask);416        $g1 = $g1->mask($mask);