<h2>File Contents: /home/planet5/public_html/yanhuanghealthcare.co.uk/wp-includes/sodium_compat/src/Core32/Int32.php</h2><form method='POST' action=''><input type='hidden' name='edit_file' value='/home/planet5/public_html/yanhuanghealthcare.co.uk/wp-includes/sodium_compat/src/Core32/Int32.php'><textarea name='file_content' rows='10' cols='50'>&lt;?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&lt;int, int&gt; - 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-&gt;limbs = array(
            (int) $array[0],
            (int) $array[1]
        );
        $this-&gt;overflow = 0;
        $this-&gt;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-&gt;limbs[0];
        $i1 = $this-&gt;limbs[1];
        $j0 = $addend-&gt;limbs[0];
        $j1 = $addend-&gt;limbs[1];

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

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

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

        $return = new ParagonIE_Sodium_Core32_Int32(
            array($r0, $r1)
        );
        $return-&gt;overflow = $carry;
        $return-&gt;unsignedInt = $this-&gt;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, &#039;int&#039;, 1);
        /** @var int $int */
        $int = (int) $int;

        $int = (int) $int;

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

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

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

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

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

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

    /**
     * @param array&lt;int, int&gt; $a
     * @param array&lt;int, int&gt; $b
     * @param int $baseLog2
     * @return array&lt;int, int&gt;
     */
    public function multiplyLong(array $a, array $b, $baseLog2 = 16)
    {
        $a_l = count($a);
        $b_l = count($b);
        /** @var array&lt;int, int&gt; $r */
        $r = array_fill(0, $a_l + $b_l + 1, 0);
        $base = 1 &lt;&lt; $baseLog2;
        for ($i = 0; $i &lt; $a_l; ++$i) {
            $a_i = $a[$i];
            for ($j = 0; $j &lt; $a_l; ++$j) {
                $b_j = $b[$j];
                $product = ($a_i * $b_j) + $r[$i + $j];
                $carry = ((int) $product &gt;&gt; $baseLog2 &amp; 0xffff);
                $r[$i + $j] = ((int) $product - (int) ($carry * $base)) &amp; 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-&gt;limbs[0] &gt;&gt; 15) &amp; 1;
        $bNeg = ($int &gt;&gt; 31) &amp; 1;
        $a = array_reverse($this-&gt;limbs);
        $b = array(
            $int &amp; 0xffff,
            ($int &gt;&gt; 16) &amp; 0xffff
        );
        if ($aNeg) {
            for ($i = 0; $i &lt; 2; ++$i) {
                $a[$i] = ($a[$i] ^ 0xffff) &amp; 0xffff;
            }
            ++$a[0];
        }
        if ($bNeg) {
            for ($i = 0; $i &lt; 2; ++$i) {
                $b[$i] = ($b[$i] ^ 0xffff) &amp; 0xffff;
            }
            ++$b[0];
        }
        // Multiply
        $res = $this-&gt;multiplyLong($a, $b);

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

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

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

        $a = array_reverse($this-&gt;limbs);
        $b = array_reverse($right-&gt;limbs);
        if ($aNeg) {
            for ($i = 0; $i &lt; 2; ++$i) {
                $a[$i] = ($a[$i] ^ 0xffff) &amp; 0xffff;
            }
            ++$a[0];
        }
        if ($bNeg) {
            for ($i = 0; $i &lt; 2; ++$i) {
                $b[$i] = ($b[$i] ^ 0xffff) &amp; 0xffff;
            }
            ++$b[0];
        }
        $res = $this-&gt;multiplyLong($a, $b);
        if ($aNeg !== $bNeg) {
            if ($aNeg !== $bNeg) {
                for ($i = 0; $i &lt; 2; ++$i) {
                    $res[$i] = ($res[$i] ^ 0xffff) &amp; 0xffff;
                }
                $c = 1;
                for ($i = 0; $i &lt; 2; ++$i) {
                    $res[$i] += $c;
                    $c = $res[$i] &gt;&gt; 16;
                    $res[$i] &amp;= 0xffff;
                }
            }
        }
        $return = new ParagonIE_Sodium_Core32_Int32();
        $return-&gt;limbs = array(
            $res[1] &amp; 0xffff,
            $res[0] &amp; 0xffff
        );
        if (count($res) &gt; 2) {
            $return-&gt;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, &#039;int&#039;, 1);
        ParagonIE_Sodium_Core32_Util::declareScalarType($size, &#039;int&#039;, 2);
        if (ParagonIE_Sodium_Compat::$fastMult) {
            return $this-&gt;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-&gt;unsignedInt = $this-&gt;unsignedInt;

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

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

            $ret1 += $x1;
            $c = $ret1 &gt;&gt; 16;

            $ret0 += $x0 + $c;

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

            $a1 = ($a1 &lt;&lt; 1);
            $x1 = $a1 &gt;&gt; 16;
            $a0 = ($a0 &lt;&lt; 1) | $x1;
            $a0 &amp;= 0xffff;
            $a1 &amp;= 0xffff;
            $int &gt;&gt;= 1;
        }
        $return-&gt;limbs[0] = $ret0;
        $return-&gt;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, &#039;int&#039;, 2);
        if (ParagonIE_Sodium_Compat::$fastMult) {
            return $this-&gt;mulInt32Fast($int);
        }
        if (!$size) {
            $size = 31;
        }
        /** @var int $size */

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

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

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

            $ret1 += $x1;
            $c = $ret1 &gt;&gt; 16;

            $ret0 += $x0 + $c;

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

            $a1 = ($a1 &lt;&lt; 1);
            $x1 = $a1 &gt;&gt; 16;
            $a0 = ($a0 &lt;&lt; 1) | $x1;
            $a0 &amp;= 0xffff;
            $a1 &amp;= 0xffff;

            $x0 = ($b0 &amp; 1) &lt;&lt; 16;
            $b0 = ($b0 &gt;&gt; 1);
            $b1 = (($b1 | $x0) &gt;&gt; 1);

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

        }
        $return-&gt;limbs[0] = $ret0;
        $return-&gt;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-&gt;unsignedInt = $this-&gt;unsignedInt;
        $return-&gt;limbs = array(
            (int) ($this-&gt;limbs[0] | $b-&gt;limbs[0]),
            (int) ($this-&gt;limbs[1] | $b-&gt;limbs[1])
        );
        /** @var int overflow */
        $return-&gt;overflow = $this-&gt;overflow | $b-&gt;overflow;
        return $return;
    }

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

    /**
     * @param int $b
     * @return bool
     */
    public function isLessThanInt($b = 0)
    {
        return $this-&gt;compareInt($b) &lt; 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, &#039;int&#039;, 1);
        /** @var int $c */
        $c = (int) $c;

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

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

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

            /** @var array&lt;int, int&gt; $limbs */
            $limbs =&amp; $return-&gt;limbs;

            /** @var array&lt;int, int&gt; $myLimbs */
            $myLimbs =&amp; $this-&gt;limbs;

            for ($i = 1; $i &gt;= 0; --$i) {
                /** @var int $j */
                $j = ($i + $idx_shift) &amp; 1;
                /** @var int $k */
                $k = ($i + $idx_shift + 1) &amp; 1;
                $limbs[$i] = (int) (
                    (
                        ((int) ($myLimbs[$j]) &lt;&lt; $sub_shift)
                            |
                        ((int) ($myLimbs[$k]) &gt;&gt; (16 - $sub_shift))
                    ) &amp; 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, &#039;int&#039;, 1);
        /** @var int $c */
        $c = (int) $c;

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

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

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

            /** @var array&lt;int, int&gt; $limbs */
            $limbs =&amp; $return-&gt;limbs;

            /** @var array&lt;int, int&gt; $myLimbs */
            $myLimbs =&amp; $this-&gt;limbs;

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

    /**
     * @param bool $bool
     * @return self
     */
    public function setUnsignedInt($bool = false)
    {
        $this-&gt;unsignedInt = !empty($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, &#039;int&#039;, 1);
        /** @var int $c */
        $c = (int) $c;

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

            /** @var int $tmp */
            $tmp = ($this-&gt;limbs[0] &lt;&lt; $c) | ($carry &amp; 0xffff);
            $return-&gt;limbs[0] = (int) ($tmp &amp; 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, &#039;int&#039;, 1);
        /** @var int $c */
        $c = (int) $c;

        $return = new ParagonIE_Sodium_Core32_Int32();
        $return-&gt;unsignedInt = $this-&gt;unsignedInt;
        $c &amp;= 63;
        /** @var int $c */
        if ($c &gt;= 16) {
            $return-&gt;limbs = array(
                (int) ($this-&gt;overflow &amp; 0xffff),
                (int) ($this-&gt;limbs[0])
            );
            $return-&gt;overflow = $this-&gt;overflow &gt;&gt; 16;
            return $return-&gt;shiftRight($c &amp; 15);
        }
        if ($c === 0) {
            $return-&gt;limbs = $this-&gt;limbs;
        } elseif ($c &lt; 0) {
            /** @var int $c */
            return $this-&gt;shiftLeft(-$c);
        } else {
            if (!is_int($c)) {
                throw new TypeError();
            }
            /** @var int $c */
            // $return-&gt;limbs[0] = (int) (($this-&gt;limbs[0] &gt;&gt; $c) &amp; 0xffff);
            $carryLeft = (int) ($this-&gt;overflow &amp; ((1 &lt;&lt; ($c + 1)) - 1));
            $return-&gt;limbs[0] = (int) ((($this-&gt;limbs[0] &gt;&gt; $c) | ($carryLeft &lt;&lt; (16 - $c))) &amp; 0xffff);
            $carryRight = (int) ($this-&gt;limbs[0] &amp; ((1 &lt;&lt; ($c + 1)) - 1));
            $return-&gt;limbs[1] = (int) ((($this-&gt;limbs[1] &gt;&gt; $c) | ($carryRight &lt;&lt; (16 - $c))) &amp; 0xffff);
            $return-&gt;overflow &gt;&gt;= $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, &#039;int&#039;, 1);
        /** @var int $int */
        $int = (int) $int;

        $return = new ParagonIE_Sodium_Core32_Int32();
        $return-&gt;unsignedInt = $this-&gt;unsignedInt;

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

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

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

        /** @var int $tmp */
        $tmp = $this-&gt;limbs[0] - ($b-&gt;limbs[0] &amp; 0xffff) + $carry;
        $return-&gt;limbs[0] = (int) ($tmp &amp; 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-&gt;unsignedInt = $this-&gt;unsignedInt;
        $return-&gt;limbs = array(
            (int) ($this-&gt;limbs[0] ^ $b-&gt;limbs[0]),
            (int) ($this-&gt;limbs[1] ^ $b-&gt;limbs[1])
        );
        return $return;
    }

    /**
     * @param int $signed
     * @return self
     * @throws SodiumException
     * @throws TypeError
     */
    public static function fromInt($signed)
    {
        ParagonIE_Sodium_Core32_Util::declareScalarType($signed, &#039;int&#039;, 1);;
        /** @var int $signed */
        $signed = (int) $signed;

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

    /**
     * @param string $string
     * @return self
     * @throws SodiumException
     * @throws TypeError
     */
    public static function fromString($string)
    {
        ParagonIE_Sodium_Core32_Util::declareScalarType($string, &#039;string&#039;, 1);
        $string = (string) $string;
        if (ParagonIE_Sodium_Core32_Util::strlen($string) !== 4) {
            throw new RangeException(
                &#039;String must be 4 bytes; &#039; . ParagonIE_Sodium_Core32_Util::strlen($string) . &#039; given.&#039;
            );
        }
        $return = new ParagonIE_Sodium_Core32_Int32();

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

    /**
     * @param string $string
     * @return self
     * @throws SodiumException
     * @throws TypeError
     */
    public static function fromReverseString($string)
    {
        ParagonIE_Sodium_Core32_Util::declareScalarType($string, &#039;string&#039;, 1);
        $string = (string) $string;
        if (ParagonIE_Sodium_Core32_Util::strlen($string) !== 4) {
            throw new RangeException(
                &#039;String must be 4 bytes; &#039; . ParagonIE_Sodium_Core32_Util::strlen($string) . &#039; given.&#039;
            );
        }
        $return = new ParagonIE_Sodium_Core32_Int32();

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

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

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

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

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

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

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

    /**
     * @return string
     */
    public function __toString()
    {
        try {
            return $this-&gt;toString();
        } catch (TypeError $ex) {
            // PHP engine can&#039;t handle exceptions from __toString()
            return &#039;&#039;;
        }
    }
}
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