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<?php

/**
 * Class ParagonIE_Sodium_Core32_Int32
 *
 * Encapsulates a 32-bit integer.
 *
 * These are immutable. It always returns a new instance.
 */
class ParagonIE_Sodium_Core32_Int32
{
    /**
     * @var array<int, int> - two 16-bit integers
     *
     * 0 is the higher 16 bits
     * 1 is the lower 16 bits
     */
    public $limbs = array(0, 0);

    /**
     * @var int
     */
    public $overflow = 0;

    /**
     * @var bool
     */
    public $unsignedInt = false;

    /**
     * ParagonIE_Sodium_Core32_Int32 constructor.
     * @param array $array
     * @param bool $unsignedInt
     */
    public function __construct($array = array(0, 0), $unsignedInt = false)
    {
        $this->limbs = array(
            (int) $array[0],
            (int) $array[1]
        );
        $this->overflow = 0;
        $this->unsignedInt = $unsignedInt;
    }

    /**
     * Adds two int32 objects
     *
     * @param ParagonIE_Sodium_Core32_Int32 $addend
     * @return ParagonIE_Sodium_Core32_Int32
     */
    public function addInt32(ParagonIE_Sodium_Core32_Int32 $addend)
    {
        $i0 = $this->limbs[0];
        $i1 = $this->limbs[1];
        $j0 = $addend->limbs[0];
        $j1 = $addend->limbs[1];

        $r1 = $i1 + ($j1 & 0xffff);
        $carry = $r1 >> 16;

        $r0 = $i0 + ($j0 & 0xffff) + $carry;
        $carry = $r0 >> 16;

        $r0 &= 0xffff;
        $r1 &= 0xffff;

        $return = new ParagonIE_Sodium_Core32_Int32(
            array($r0, $r1)
        );
        $return->overflow = $carry;
        $return->unsignedInt = $this->unsignedInt;
        return $return;
    }

    /**
     * Adds a normal integer to an int32 object
     *
     * @param int $int
     * @return ParagonIE_Sodium_Core32_Int32
     * @throws SodiumException
     * @throws TypeError
     */
    public function addInt($int)
    {
        ParagonIE_Sodium_Core32_Util::declareScalarType($int, 'int', 1);
        /** @var int $int */
        $int = (int) $int;

        $int = (int) $int;

        $i0 = $this->limbs[0];
        $i1 = $this->limbs[1];

        $r1 = $i1 + ($int & 0xffff);
        $carry = $r1 >> 16;

        $r0 = $i0 + (($int >> 16) & 0xffff) + $carry;
        $carry = $r0 >> 16;
        $r0 &= 0xffff;
        $r1 &= 0xffff;
        $return = new ParagonIE_Sodium_Core32_Int32(
            array($r0, $r1)
        );
        $return->overflow = $carry;
        $return->unsignedInt = $this->unsignedInt;
        return $return;
    }

    /**
     * @param int $b
     * @return int
     */
    public function compareInt($b = 0)
    {
        $gt = 0;
        $eq = 1;

        $i = 2;
        $j = 0;
        while ($i > 0) {
            --$i;
            /** @var int $x1 */
            $x1 = $this->limbs[$i];
            /** @var int $x2 */
            $x2 = ($b >> ($j << 4)) & 0xffff;
            /** @var int $gt */
            $gt |= (($x2 - $x1) >> 8) & $eq;
            /** @var int $eq */
            $eq &= (($x2 ^ $x1) - 1) >> 8;
        }
        return ($gt + $gt - $eq) + 1;
    }

    /**
     * @param int $m
     * @return ParagonIE_Sodium_Core32_Int32
     */
    public function mask($m = 0)
    {
        /** @var int $hi */
        $hi = ((int) $m >> 16);
        $hi &= 0xffff;
        /** @var int $lo */
        $lo = ((int) $m) & 0xffff;
        return new ParagonIE_Sodium_Core32_Int32(
            array(
                (int) ($this->limbs[0] & $hi),
                (int) ($this->limbs[1] & $lo)
            ),
            $this->unsignedInt
        );
    }

    /**
     * @param array<int, int> $a
     * @param array<int, int> $b
     * @param int $baseLog2
     * @return array<int, int>
     */
    public function multiplyLong(array $a, array $b, $baseLog2 = 16)
    {
        $a_l = count($a);
        $b_l = count($b);
        /** @var array<int, int> $r */
        $r = array_fill(0, $a_l + $b_l + 1, 0);
        $base = 1 << $baseLog2;
        for ($i = 0; $i < $a_l; ++$i) {
            $a_i = $a[$i];
            for ($j = 0; $j < $a_l; ++$j) {
                $b_j = $b[$j];
                $product = ($a_i * $b_j) + $r[$i + $j];
                $carry = ((int) $product >> $baseLog2 & 0xffff);
                $r[$i + $j] = ((int) $product - (int) ($carry * $base)) & 0xffff;
                $r[$i + $j + 1] += $carry;
            }
        }
        return array_slice($r, 0, 5);
    }

    /**
     * @param int $int
     * @return ParagonIE_Sodium_Core32_Int32
     */
    public function mulIntFast($int)
    {
        // Handle negative numbers
        $aNeg = ($this->limbs[0] >> 15) & 1;
        $bNeg = ($int >> 31) & 1;
        $a = array_reverse($this->limbs);
        $b = array(
            $int & 0xffff,
            ($int >> 16) & 0xffff
        );
        if ($aNeg) {
            for ($i = 0; $i < 2; ++$i) {
                $a[$i] = ($a[$i] ^ 0xffff) & 0xffff;
            }
            ++$a[0];
        }
        if ($bNeg) {
            for ($i = 0; $i < 2; ++$i) {
                $b[$i] = ($b[$i] ^ 0xffff) & 0xffff;
            }
            ++$b[0];
        }
        // Multiply
        $res = $this->multiplyLong($a, $b);

        // Re-apply negation to results
        if ($aNeg !== $bNeg) {
            for ($i = 0; $i < 2; ++$i) {
                $res[$i] = (0xffff ^ $res[$i]) & 0xffff;
            }
            // Handle integer overflow
            $c = 1;
            for ($i = 0; $i < 2; ++$i) {
                $res[$i] += $c;
                $c = $res[$i] >> 16;
                $res[$i] &= 0xffff;
            }
        }

        // Return our values
        $return = new ParagonIE_Sodium_Core32_Int32();
        $return->limbs = array(
            $res[1] & 0xffff,
            $res[0] & 0xffff
        );
        if (count($res) > 2) {
            $return->overflow = $res[2] & 0xffff;
        }
        $return->unsignedInt = $this->unsignedInt;
        return $return;
    }

    /**
     * @param ParagonIE_Sodium_Core32_Int32 $right
     * @return ParagonIE_Sodium_Core32_Int32
     */
    public function mulInt32Fast(ParagonIE_Sodium_Core32_Int32 $right)
    {
        $aNeg = ($this->limbs[0] >> 15) & 1;
        $bNeg = ($right->limbs[0] >> 15) & 1;

        $a = array_reverse($this->limbs);
        $b = array_reverse($right->limbs);
        if ($aNeg) {
            for ($i = 0; $i < 2; ++$i) {
                $a[$i] = ($a[$i] ^ 0xffff) & 0xffff;
            }
            ++$a[0];
        }
        if ($bNeg) {
            for ($i = 0; $i < 2; ++$i) {
                $b[$i] = ($b[$i] ^ 0xffff) & 0xffff;
            }
            ++$b[0];
        }
        $res = $this->multiplyLong($a, $b);
        if ($aNeg !== $bNeg) {
            if ($aNeg !== $bNeg) {
                for ($i = 0; $i < 2; ++$i) {
                    $res[$i] = ($res[$i] ^ 0xffff) & 0xffff;
                }
                $c = 1;
                for ($i = 0; $i < 2; ++$i) {
                    $res[$i] += $c;
                    $c = $res[$i] >> 16;
                    $res[$i] &= 0xffff;
                }
            }
        }
        $return = new ParagonIE_Sodium_Core32_Int32();
        $return->limbs = array(
            $res[1] & 0xffff,
            $res[0] & 0xffff
        );
        if (count($res) > 2) {
            $return->overflow = $res[2];
        }
        return $return;
    }

    /**
     * @param int $int
     * @param int $size
     * @return ParagonIE_Sodium_Core32_Int32
     * @throws SodiumException
     * @throws TypeError
     */
    public function mulInt($int = 0, $size = 0)
    {
        ParagonIE_Sodium_Core32_Util::declareScalarType($int, 'int', 1);
        ParagonIE_Sodium_Core32_Util::declareScalarType($size, 'int', 2);
        if (ParagonIE_Sodium_Compat::$fastMult) {
            return $this->mulIntFast((int) $int);
        }
        /** @var int $int */
        $int = (int) $int;
        /** @var int $size */
        $size = (int) $size;

        if (!$size) {
            $size = 31;
        }
        /** @var int $size */

        $a = clone $this;
        $return = new ParagonIE_Sodium_Core32_Int32();
        $return->unsignedInt = $this->unsignedInt;

        // Initialize:
        $ret0 = 0;
        $ret1 = 0;
        $a0 = $a->limbs[0];
        $a1 = $a->limbs[1];

        /** @var int $size */
        /** @var int $i */
        for ($i = $size; $i >= 0; --$i) {
            $m = (int) (-($int & 1));
            $x0 = $a0 & $m;
            $x1 = $a1 & $m;

            $ret1 += $x1;
            $c = $ret1 >> 16;

            $ret0 += $x0 + $c;

            $ret0 &= 0xffff;
            $ret1 &= 0xffff;

            $a1 = ($a1 << 1);
            $x1 = $a1 >> 16;
            $a0 = ($a0 << 1) | $x1;
            $a0 &= 0xffff;
            $a1 &= 0xffff;
            $int >>= 1;
        }
        $return->limbs[0] = $ret0;
        $return->limbs[1] = $ret1;
        return $return;
    }

    /**
     * @param ParagonIE_Sodium_Core32_Int32 $int
     * @param int $size
     * @return ParagonIE_Sodium_Core32_Int32
     * @throws SodiumException
     * @throws TypeError
     */
    public function mulInt32(ParagonIE_Sodium_Core32_Int32 $int, $size = 0)
    {
        ParagonIE_Sodium_Core32_Util::declareScalarType($size, 'int', 2);
        if (ParagonIE_Sodium_Compat::$fastMult) {
            return $this->mulInt32Fast($int);
        }
        if (!$size) {
            $size = 31;
        }
        /** @var int $size */

        $a = clone $this;
        $b = clone $int;
        $return = new ParagonIE_Sodium_Core32_Int32();
        $return->unsignedInt = $this->unsignedInt;

        // Initialize:
        $ret0 = 0;
        $ret1 = 0;
        $a0 = $a->limbs[0];
        $a1 = $a->limbs[1];
        $b0 = $b->limbs[0];
        $b1 = $b->limbs[1];

        /** @var int $size */
        /** @var int $i */
        for ($i = $size; $i >= 0; --$i) {
            $m = (int) (-($b1 & 1));
            $x0 = $a0 & $m;
            $x1 = $a1 & $m;

            $ret1 += $x1;
            $c = $ret1 >> 16;

            $ret0 += $x0 + $c;

            $ret0 &= 0xffff;
            $ret1 &= 0xffff;

            $a1 = ($a1 << 1);
            $x1 = $a1 >> 16;
            $a0 = ($a0 << 1) | $x1;
            $a0 &= 0xffff;
            $a1 &= 0xffff;

            $x0 = ($b0 & 1) << 16;
            $b0 = ($b0 >> 1);
            $b1 = (($b1 | $x0) >> 1);

            $b0 &= 0xffff;
            $b1 &= 0xffff;

        }
        $return->limbs[0] = $ret0;
        $return->limbs[1] = $ret1;

        return $return;
    }

    /**
     * OR this 32-bit integer with another.
     *
     * @param ParagonIE_Sodium_Core32_Int32 $b
     * @return ParagonIE_Sodium_Core32_Int32
     */
    public function orInt32(ParagonIE_Sodium_Core32_Int32 $b)
    {
        $return = new ParagonIE_Sodium_Core32_Int32();
        $return->unsignedInt = $this->unsignedInt;
        $return->limbs = array(
            (int) ($this->limbs[0] | $b->limbs[0]),
            (int) ($this->limbs[1] | $b->limbs[1])
        );
        /** @var int overflow */
        $return->overflow = $this->overflow | $b->overflow;
        return $return;
    }

    /**
     * @param int $b
     * @return bool
     */
    public function isGreaterThan($b = 0)
    {
        return $this->compareInt($b) > 0;
    }

    /**
     * @param int $b
     * @return bool
     */
    public function isLessThanInt($b = 0)
    {
        return $this->compareInt($b) < 0;
    }

    /**
     * @param int $c
     * @return ParagonIE_Sodium_Core32_Int32
     * @throws SodiumException
     * @throws TypeError
     * @psalm-suppress MixedArrayAccess
     */
    public function rotateLeft($c = 0)
    {
        ParagonIE_Sodium_Core32_Util::declareScalarType($c, 'int', 1);
        /** @var int $c */
        $c = (int) $c;

        $return = new ParagonIE_Sodium_Core32_Int32();
        $return->unsignedInt = $this->unsignedInt;
        $c &= 31;
        if ($c === 0) {
            // NOP, but we want a copy.
            $return->limbs = $this->limbs;
        } else {
            /** @var int $c */

            /** @var int $idx_shift */
            $idx_shift = ($c >> 4) & 1;

            /** @var int $sub_shift */
            $sub_shift = $c & 15;

            /** @var array<int, int> $limbs */
            $limbs =& $return->limbs;

            /** @var array<int, int> $myLimbs */
            $myLimbs =& $this->limbs;

            for ($i = 1; $i >= 0; --$i) {
                /** @var int $j */
                $j = ($i + $idx_shift) & 1;
                /** @var int $k */
                $k = ($i + $idx_shift + 1) & 1;
                $limbs[$i] = (int) (
                    (
                        ((int) ($myLimbs[$j]) << $sub_shift)
                            |
                        ((int) ($myLimbs[$k]) >> (16 - $sub_shift))
                    ) & 0xffff
                );
            }
        }
        return $return;
    }

    /**
     * Rotate to the right
     *
     * @param int $c
     * @return ParagonIE_Sodium_Core32_Int32
     * @throws SodiumException
     * @throws TypeError
     * @psalm-suppress MixedArrayAccess
     */
    public function rotateRight($c = 0)
    {
        ParagonIE_Sodium_Core32_Util::declareScalarType($c, 'int', 1);
        /** @var int $c */
        $c = (int) $c;

        $return = new ParagonIE_Sodium_Core32_Int32();
        $return->unsignedInt = $this->unsignedInt;
        $c &= 31;
        /** @var int $c */
        if ($c === 0) {
            // NOP, but we want a copy.
            $return->limbs = $this->limbs;
        } else {
            /** @var int $c */

            /** @var int $idx_shift */
            $idx_shift = ($c >> 4) & 1;

            /** @var int $sub_shift */
            $sub_shift = $c & 15;

            /** @var array<int, int> $limbs */
            $limbs =& $return->limbs;

            /** @var array<int, int> $myLimbs */
            $myLimbs =& $this->limbs;

            for ($i = 1; $i >= 0; --$i) {
                /** @var int $j */
                $j = ($i - $idx_shift) & 1;
                /** @var int $k */
                $k = ($i - $idx_shift - 1) & 1;
                $limbs[$i] = (int) (
                    (
                        ((int) ($myLimbs[$j]) >> (int) ($sub_shift))
                            |
                        ((int) ($myLimbs[$k]) << (16 - (int) ($sub_shift)))
                    ) & 0xffff
                );
            }
        }
        return $return;
    }

    /**
     * @param bool $bool
     * @return self
     */
    public function setUnsignedInt($bool = false)
    {
        $this->unsignedInt = !empty($bool);
        return $this;
    }

    /**
     * @param int $c
     * @return ParagonIE_Sodium_Core32_Int32
     * @throws SodiumException
     * @throws TypeError
     */
    public function shiftLeft($c = 0)
    {
        ParagonIE_Sodium_Core32_Util::declareScalarType($c, 'int', 1);
        /** @var int $c */
        $c = (int) $c;

        $return = new ParagonIE_Sodium_Core32_Int32();
        $return->unsignedInt = $this->unsignedInt;
        $c &= 63;
        /** @var int $c */
        if ($c === 0) {
            $return->limbs = $this->limbs;
        } elseif ($c < 0) {
            /** @var int $c */
            return $this->shiftRight(-$c);
        } else {
            /** @var int $c */
            /** @var int $tmp */
            $tmp = $this->limbs[1] << $c;
            $return->limbs[1] = (int)($tmp & 0xffff);
            /** @var int $carry */
            $carry = $tmp >> 16;

            /** @var int $tmp */
            $tmp = ($this->limbs[0] << $c) | ($carry & 0xffff);
            $return->limbs[0] = (int) ($tmp & 0xffff);
        }
        return $return;
    }

    /**
     * @param int $c
     * @return ParagonIE_Sodium_Core32_Int32
     * @throws SodiumException
     * @throws TypeError
     * @psalm-suppress MixedAssignment
     * @psalm-suppress MixedOperand
     */
    public function shiftRight($c = 0)
    {
        ParagonIE_Sodium_Core32_Util::declareScalarType($c, 'int', 1);
        /** @var int $c */
        $c = (int) $c;

        $return = new ParagonIE_Sodium_Core32_Int32();
        $return->unsignedInt = $this->unsignedInt;
        $c &= 63;
        /** @var int $c */
        if ($c >= 16) {
            $return->limbs = array(
                (int) ($this->overflow & 0xffff),
                (int) ($this->limbs[0])
            );
            $return->overflow = $this->overflow >> 16;
            return $return->shiftRight($c & 15);
        }
        if ($c === 0) {
            $return->limbs = $this->limbs;
        } elseif ($c < 0) {
            /** @var int $c */
            return $this->shiftLeft(-$c);
        } else {
            if (!is_int($c)) {
                throw new TypeError();
            }
            /** @var int $c */
            // $return->limbs[0] = (int) (($this->limbs[0] >> $c) & 0xffff);
            $carryLeft = (int) ($this->overflow & ((1 << ($c + 1)) - 1));
            $return->limbs[0] = (int) ((($this->limbs[0] >> $c) | ($carryLeft << (16 - $c))) & 0xffff);
            $carryRight = (int) ($this->limbs[0] & ((1 << ($c + 1)) - 1));
            $return->limbs[1] = (int) ((($this->limbs[1] >> $c) | ($carryRight << (16 - $c))) & 0xffff);
            $return->overflow >>= $c;
        }
        return $return;
    }

    /**
     * Subtract a normal integer from an int32 object.
     *
     * @param int $int
     * @return ParagonIE_Sodium_Core32_Int32
     * @throws SodiumException
     * @throws TypeError
     */
    public function subInt($int)
    {
        ParagonIE_Sodium_Core32_Util::declareScalarType($int, 'int', 1);
        /** @var int $int */
        $int = (int) $int;

        $return = new ParagonIE_Sodium_Core32_Int32();
        $return->unsignedInt = $this->unsignedInt;

        /** @var int $tmp */
        $tmp = $this->limbs[1] - ($int & 0xffff);
        /** @var int $carry */
        $carry = $tmp >> 16;
        $return->limbs[1] = (int) ($tmp & 0xffff);

        /** @var int $tmp */
        $tmp = $this->limbs[0] - (($int >> 16) & 0xffff) + $carry;
        $return->limbs[0] = (int) ($tmp & 0xffff);
        return $return;
    }

    /**
     * Subtract two int32 objects from each other
     *
     * @param ParagonIE_Sodium_Core32_Int32 $b
     * @return ParagonIE_Sodium_Core32_Int32
     */
    public function subInt32(ParagonIE_Sodium_Core32_Int32 $b)
    {
        $return = new ParagonIE_Sodium_Core32_Int32();
        $return->unsignedInt = $this->unsignedInt;

        /** @var int $tmp */
        $tmp = $this->limbs[1] - ($b->limbs[1] & 0xffff);
        /** @var int $carry */
        $carry = $tmp >> 16;
        $return->limbs[1] = (int) ($tmp & 0xffff);

        /** @var int $tmp */
        $tmp = $this->limbs[0] - ($b->limbs[0] & 0xffff) + $carry;
        $return->limbs[0] = (int) ($tmp & 0xffff);
        return $return;
    }

    /**
     * XOR this 32-bit integer with another.
     *
     * @param ParagonIE_Sodium_Core32_Int32 $b
     * @return ParagonIE_Sodium_Core32_Int32
     */
    public function xorInt32(ParagonIE_Sodium_Core32_Int32 $b)
    {
        $return = new ParagonIE_Sodium_Core32_Int32();
        $return->unsignedInt = $this->unsignedInt;
        $return->limbs = array(
            (int) ($this->limbs[0] ^ $b->limbs[0]),
            (int) ($this->limbs[1] ^ $b->limbs[1])
        );
        return $return;
    }

    /**
     * @param int $signed
     * @return self
     * @throws SodiumException
     * @throws TypeError
     */
    public static function fromInt($signed)
    {
        ParagonIE_Sodium_Core32_Util::declareScalarType($signed, 'int', 1);;
        /** @var int $signed */
        $signed = (int) $signed;

        return new ParagonIE_Sodium_Core32_Int32(
            array(
                (int) (($signed >> 16) & 0xffff),
                (int) ($signed & 0xffff)
            )
        );
    }

    /**
     * @param string $string
     * @return self
     * @throws SodiumException
     * @throws TypeError
     */
    public static function fromString($string)
    {
        ParagonIE_Sodium_Core32_Util::declareScalarType($string, 'string', 1);
        $string = (string) $string;
        if (ParagonIE_Sodium_Core32_Util::strlen($string) !== 4) {
            throw new RangeException(
                'String must be 4 bytes; ' . ParagonIE_Sodium_Core32_Util::strlen($string) . ' given.'
            );
        }
        $return = new ParagonIE_Sodium_Core32_Int32();

        $return->limbs[0]  = (int) ((ParagonIE_Sodium_Core32_Util::chrToInt($string[0]) & 0xff) << 8);
        $return->limbs[0] |= (ParagonIE_Sodium_Core32_Util::chrToInt($string[1]) & 0xff);
        $return->limbs[1]  = (int) ((ParagonIE_Sodium_Core32_Util::chrToInt($string[2]) & 0xff) << 8);
        $return->limbs[1] |= (ParagonIE_Sodium_Core32_Util::chrToInt($string[3]) & 0xff);
        return $return;
    }

    /**
     * @param string $string
     * @return self
     * @throws SodiumException
     * @throws TypeError
     */
    public static function fromReverseString($string)
    {
        ParagonIE_Sodium_Core32_Util::declareScalarType($string, 'string', 1);
        $string = (string) $string;
        if (ParagonIE_Sodium_Core32_Util::strlen($string) !== 4) {
            throw new RangeException(
                'String must be 4 bytes; ' . ParagonIE_Sodium_Core32_Util::strlen($string) . ' given.'
            );
        }
        $return = new ParagonIE_Sodium_Core32_Int32();

        $return->limbs[0]  = (int) ((ParagonIE_Sodium_Core32_Util::chrToInt($string[3]) & 0xff) << 8);
        $return->limbs[0] |= (ParagonIE_Sodium_Core32_Util::chrToInt($string[2]) & 0xff);
        $return->limbs[1]  = (int) ((ParagonIE_Sodium_Core32_Util::chrToInt($string[1]) & 0xff) << 8);
        $return->limbs[1] |= (ParagonIE_Sodium_Core32_Util::chrToInt($string[0]) & 0xff);
        return $return;
    }

    /**
     * @return array<int, int>
     */
    public function toArray()
    {
        return array((int) ($this->limbs[0] << 16 | $this->limbs[1]));
    }

    /**
     * @return string
     * @throws TypeError
     */
    public function toString()
    {
        return
            ParagonIE_Sodium_Core32_Util::intToChr(($this->limbs[0] >> 8) & 0xff) .
            ParagonIE_Sodium_Core32_Util::intToChr($this->limbs[0] & 0xff) .
            ParagonIE_Sodium_Core32_Util::intToChr(($this->limbs[1] >> 8) & 0xff) .
            ParagonIE_Sodium_Core32_Util::intToChr($this->limbs[1] & 0xff);
    }

    /**
     * @return int
     */
    public function toInt()
    {
        return (int) (
            (($this->limbs[0] & 0xffff) << 16)
                |
            ($this->limbs[1] & 0xffff)
        );
    }

    /**
     * @return ParagonIE_Sodium_Core32_Int32
     */
    public function toInt32()
    {
        $return = new ParagonIE_Sodium_Core32_Int32();
        $return->limbs[0] = (int) ($this->limbs[0] & 0xffff);
        $return->limbs[1] = (int) ($this->limbs[1] & 0xffff);
        $return->unsignedInt = $this->unsignedInt;
        $return->overflow = (int) ($this->overflow & 0x7fffffff);
        return $return;
    }

    /**
     * @return ParagonIE_Sodium_Core32_Int64
     */
    public function toInt64()
    {
        $return = new ParagonIE_Sodium_Core32_Int64();
        $return->unsignedInt = $this->unsignedInt;
        if ($this->unsignedInt) {
            $return->limbs[0] += (($this->overflow >> 16) & 0xffff);
            $return->limbs[1] += (($this->overflow) & 0xffff);
        } else {
            $neg = -(($this->limbs[0] >> 15) & 1);
            $return->limbs[0] = (int)($neg & 0xffff);
            $return->limbs[1] = (int)($neg & 0xffff);
        }
        $return->limbs[2] = (int) ($this->limbs[0] & 0xffff);
        $return->limbs[3] = (int) ($this->limbs[1] & 0xffff);
        return $return;
    }

    /**
     * @return string
     * @throws TypeError
     */
    public function toReverseString()
    {
        return ParagonIE_Sodium_Core32_Util::intToChr($this->limbs[1] & 0xff) .
            ParagonIE_Sodium_Core32_Util::intToChr(($this->limbs[1] >> 8) & 0xff) .
            ParagonIE_Sodium_Core32_Util::intToChr($this->limbs[0] & 0xff) .
            ParagonIE_Sodium_Core32_Util::intToChr(($this->limbs[0] >> 8) & 0xff);
    }

    /**
     * @return string
     */
    public function __toString()
    {
        try {
            return $this->toString();
        } catch (TypeError $ex) {
            // PHP engine can't handle exceptions from __toString()
            return '';
        }
    }
}

Filemanager

Name Type Size Permission Actions
ChaCha20 Folder 0755
Curve25519 Folder 0755
Poly1305 Folder 0755
SecretStream Folder 0755
BLAKE2b.php File 21.8 KB 0644
ChaCha20.php File 14.17 KB 0644
Curve25519.php File 129.86 KB 0644
Ed25519.php File 15.37 KB 0644
HChaCha20.php File 5.17 KB 0644
HSalsa20.php File 6.78 KB 0644
Int32.php File 24 KB 0644
Int64.php File 30.44 KB 0644
Poly1305.php File 1.55 KB 0644
Salsa20.php File 11.24 KB 0644
SipHash.php File 6.46 KB 0644
Util.php File 209 B 0644
X25519.php File 10.78 KB 0644
XChaCha20.php File 2.4 KB 0644
XSalsa20.php File 1.35 KB 0644