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Current directory: /code/wp-includes/sodium_compat/src/Core32
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File: Int64.php

<?php

/**
 * Class ParagonIE_Sodium_Core32_Int64
 *
 * Encapsulates a 64-bit integer.
 *
 * These are immutable. It always returns a new instance.
 */
class ParagonIE_Sodium_Core32_Int64
{
    /**
     * @var array<int, int> - four 16-bit integers
     */
    public $limbs = array(0, 0, 0, 0);

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

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

/**
     * ParagonIE_Sodium_Core32_Int64 constructor.
     * @param array $array
     * @param bool $unsignedInt
     */
    public function __construct($array = array(0, 0, 0, 0), $unsignedInt = false)
    {
        $this->limbs = array(
            (int) $array[0],
            (int) $array[1],
            (int) $array[2],
            (int) $array[3]
        );
        $this->overflow = 0;
        $this->unsignedInt = $unsignedInt;
    }

/**
     * Adds two int64 objects
     *
     * @param ParagonIE_Sodium_Core32_Int64 $addend
     * @return ParagonIE_Sodium_Core32_Int64
     */
    public function addInt64(ParagonIE_Sodium_Core32_Int64 $addend)
    {
        $i0 = $this->limbs[0];
        $i1 = $this->limbs[1];
        $i2 = $this->limbs[2];
        $i3 = $this->limbs[3];
        $j0 = $addend->limbs[0];
        $j1 = $addend->limbs[1];
        $j2 = $addend->limbs[2];
        $j3 = $addend->limbs[3];

$r3 = $i3 + ($j3 & 0xffff);
        $carry = $r3 >> 16;

$r2 = $i2 + ($j2 & 0xffff) + $carry;
        $carry = $r2 >> 16;

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

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

$r0 &= 0xffff;
        $r1 &= 0xffff;
        $r2 &= 0xffff;
        $r3 &= 0xffff;

$return = new ParagonIE_Sodium_Core32_Int64(
            array($r0, $r1, $r2, $r3)
        );
        $return->overflow = $carry;
        $return->unsignedInt = $this->unsignedInt;
        return $return;
    }

/**
     * Adds a normal integer to an int64 object
     *
     * @param int $int
     * @return ParagonIE_Sodium_Core32_Int64
     * @throws SodiumException
     * @throws TypeError
     */
    public function addInt($int)
    {
        ParagonIE_Sodium_Core32_Util::declareScalarType($int, 'int', 1);
        /** @var int $int */
        $int = (int) $int;

$i0 = $this->limbs[0];
        $i1 = $this->limbs[1];
        $i2 = $this->limbs[2];
        $i3 = $this->limbs[3];

$r3 = $i3 + ($int & 0xffff);
        $carry = $r3 >> 16;

$r2 = $i2 + (($int >> 16) & 0xffff) + $carry;
        $carry = $r2 >> 16;

$r1 = $i1 + $carry;
        $carry = $r1 >> 16;

$r0 = $i0 + $carry;
        $carry = $r0 >> 16;

$r0 &= 0xffff;
        $r1 &= 0xffff;
        $r2 &= 0xffff;
        $r3 &= 0xffff;
        $return = new ParagonIE_Sodium_Core32_Int64(
            array($r0, $r1, $r2, $r3)
        );
        $return->overflow = $carry;
        $return->unsignedInt = $this->unsignedInt;
        return $return;
    }

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

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

/**
     * @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 $hi
     * @param int $lo
     * @return ParagonIE_Sodium_Core32_Int64
     */
    public function mask64($hi = 0, $lo = 0)
    {
        /** @var int $a */
        $a = ($hi >> 16) & 0xffff;
        /** @var int $b */
        $b = ($hi) & 0xffff;
        /** @var int $c */
        $c = ($lo >> 16) & 0xffff;
        /** @var int $d */
        $d = ($lo & 0xffff);
        return new ParagonIE_Sodium_Core32_Int64(
            array(
                $this->limbs[0] & $a,
                $this->limbs[1] & $b,
                $this->limbs[2] & $c,
                $this->limbs[3] & $d
            ),
            $this->unsignedInt
        );
    }

/**
     * @param int $int
     * @param int $size
     * @return ParagonIE_Sodium_Core32_Int64
     * @throws SodiumException
     * @throws TypeError
     * @psalm-suppress MixedAssignment
     */
    public function mulInt($int = 0, $size = 0)
    {
        if (ParagonIE_Sodium_Compat::$fastMult) {
            return $this->mulIntFast($int);
        }
        ParagonIE_Sodium_Core32_Util::declareScalarType($int, 'int', 1);
        ParagonIE_Sodium_Core32_Util::declareScalarType($size, 'int', 2);
        /** @var int $int */
        $int = (int) $int;
        /** @var int $size */
        $size = (int) $size;

if (!$size) {
            $size = 63;
        }

$a = clone $this;
        $return = new ParagonIE_Sodium_Core32_Int64();
        $return->unsignedInt = $this->unsignedInt;

// Initialize:
        $ret0 = 0;
        $ret1 = 0;
        $ret2 = 0;
        $ret3 = 0;
        $a0 = $a->limbs[0];
        $a1 = $a->limbs[1];
        $a2 = $a->limbs[2];
        $a3 = $a->limbs[3];

/** @var int $size */
        /** @var int $i */
        for ($i = $size; $i >= 0; --$i) {
            $mask = -($int & 1);
            $x0 = $a0 & $mask;
            $x1 = $a1 & $mask;
            $x2 = $a2 & $mask;
            $x3 = $a3 & $mask;

$ret3 += $x3;
            $c = $ret3 >> 16;

$ret2 += $x2 + $c;
            $c = $ret2 >> 16;

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

$ret0 += $x0 + $c;

$ret0 &= 0xffff;
            $ret1 &= 0xffff;
            $ret2 &= 0xffff;
            $ret3 &= 0xffff;

$a3 = $a3 << 1;
            $x3 = $a3 >> 16;
            $a2 = ($a2 << 1) | $x3;
            $x2 = $a2 >> 16;
            $a1 = ($a1 << 1) | $x2;
            $x1 = $a1 >> 16;
            $a0 = ($a0 << 1) | $x1;
            $a0 &= 0xffff;
            $a1 &= 0xffff;
            $a2 &= 0xffff;
            $a3 &= 0xffff;

$int >>= 1;
        }
        $return->limbs[0] = $ret0;
        $return->limbs[1] = $ret1;
        $return->limbs[2] = $ret2;
        $return->limbs[3] = $ret3;
        return $return;
    }

/**
     * @param ParagonIE_Sodium_Core32_Int64 $A
     * @param ParagonIE_Sodium_Core32_Int64 $B
     * @return array<int, ParagonIE_Sodium_Core32_Int64>
     * @throws SodiumException
     * @throws TypeError
     * @psalm-suppress MixedInferredReturnType
     */
    public static function ctSelect(
        ParagonIE_Sodium_Core32_Int64 $A,
        ParagonIE_Sodium_Core32_Int64 $B
    ) {
        $a = clone $A;
        $b = clone $B;
        /** @var int $aNeg */
        $aNeg = ($a->limbs[0] >> 15) & 1;
        /** @var int $bNeg */
        $bNeg = ($b->limbs[0] >> 15) & 1;
        /** @var int $m */
        $m = (-($aNeg & $bNeg)) | 1;
        /** @var int $swap */
        $swap = $bNeg & ~$aNeg;
        /** @var int $d */
        $d = -$swap;

/*
        if ($bNeg && !$aNeg) {
            $a = clone $int;
            $b = clone $this;
        } elseif($bNeg && $aNeg) {
            $a = $this->mulInt(-1);
            $b = $int->mulInt(-1);
        }
         */
        $x = $a->xorInt64($b)->mask64($d, $d);
        return array(
            $a->xorInt64($x)->mulInt($m),
            $b->xorInt64($x)->mulInt($m)
        );
    }

/**
     * @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 $int
     * @return ParagonIE_Sodium_Core32_Int64
     */
    public function mulIntFast($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,
            -$bNeg & 0xffff,
            -$bNeg & 0xffff
        );
        if ($aNeg) {
            for ($i = 0; $i < 4; ++$i) {
                $a[$i] = ($a[$i] ^ 0xffff) & 0xffff;
            }
            ++$a[0];
        }
        if ($bNeg) {
            for ($i = 0; $i < 4; ++$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; $i < 4; ++$i) {
                $res[$i] = (0xffff ^ $res[$i]) & 0xffff;
            }
            // Handle integer overflow
            $c = 1;
            for ($i = 0; $i < 4; ++$i) {
                $res[$i] += $c;
                $c = $res[$i] >> 16;
                $res[$i] &= 0xffff;
            }
        }

// Return our values
        $return = new ParagonIE_Sodium_Core32_Int64();
        $return->limbs = array(
            $res[3] & 0xffff,
            $res[2] & 0xffff,
            $res[1] & 0xffff,
            $res[0] & 0xffff
        );
        if (count($res) > 4) {
            $return->overflow = $res[4] & 0xffff;
        }
        $return->unsignedInt = $this->unsignedInt;
        return $return;
    }

/**
     * @param ParagonIE_Sodium_Core32_Int64 $right
     * @return ParagonIE_Sodium_Core32_Int64
     */
    public function mulInt64Fast(ParagonIE_Sodium_Core32_Int64 $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; $i < 4; ++$i) {
                $a[$i] = ($a[$i] ^ 0xffff) & 0xffff;
            }
            ++$a[0];
        }
        if ($bNeg) {
            for ($i = 0; $i < 4; ++$i) {
                $b[$i] = ($b[$i] ^ 0xffff) & 0xffff;
            }
            ++$b[0];
        }
        $res = $this->multiplyLong($a, $b);
        if ($aNeg !== $bNeg) {
            if ($aNeg !== $bNeg) {
                for ($i = 0; $i < 4; ++$i) {
                    $res[$i] = ($res[$i] ^ 0xffff) & 0xffff;
                }
                $c = 1;
                for ($i = 0; $i < 4; ++$i) {
                    $res[$i] += $c;
                    $c = $res[$i] >> 16;
                    $res[$i] &= 0xffff;
                }
            }
        }
        $return = new ParagonIE_Sodium_Core32_Int64();
        $return->limbs = array(
            $res[3] & 0xffff,
            $res[2] & 0xffff,
            $res[1] & 0xffff,
            $res[0] & 0xffff
        );
        if (count($res) > 4) {
            $return->overflow = $res[4];
        }
        return $return;
    }

/**
     * @param ParagonIE_Sodium_Core32_Int64 $int
     * @param int $size
     * @return ParagonIE_Sodium_Core32_Int64
     * @throws SodiumException
     * @throws TypeError
     * @psalm-suppress MixedAssignment
     */
    public function mulInt64(ParagonIE_Sodium_Core32_Int64 $int, $size = 0)
    {
        if (ParagonIE_Sodium_Compat::$fastMult) {
            return $this->mulInt64Fast($int);
        }
        ParagonIE_Sodium_Core32_Util::declareScalarType($size, 'int', 2);
        if (!$size) {
            $size = 63;
        }
        list($a, $b) = self::ctSelect($this, $int);

$return = new ParagonIE_Sodium_Core32_Int64();
        $return->unsignedInt = $this->unsignedInt;

// Initialize:
        $ret0 = 0;
        $ret1 = 0;
        $ret2 = 0;
        $ret3 = 0;
        $a0 = $a->limbs[0];
        $a1 = $a->limbs[1];
        $a2 = $a->limbs[2];
        $a3 = $a->limbs[3];
        $b0 = $b->limbs[0];
        $b1 = $b->limbs[1];
        $b2 = $b->limbs[2];
        $b3 = $b->limbs[3];

/** @var int $size */
        /** @var int $i */
        for ($i = (int) $size; $i >= 0; --$i) {
            $mask = -($b3 & 1);
            $x0 = $a0 & $mask;
            $x1 = $a1 & $mask;
            $x2 = $a2 & $mask;
            $x3 = $a3 & $mask;

$ret3 += $x3;
            $c = $ret3 >> 16;

$ret2 += $x2 + $c;
            $c = $ret2 >> 16;

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

$ret0 += $x0 + $c;

$ret0 &= 0xffff;
            $ret1 &= 0xffff;
            $ret2 &= 0xffff;
            $ret3 &= 0xffff;

$x0 = ($b0 & 1) << 16;
            $x1 = ($b1 & 1) << 16;
            $x2 = ($b2 & 1) << 16;

$b0 = ($b0 >> 1);
            $b1 = (($b1 | $x0) >> 1);
            $b2 = (($b2 | $x1) >> 1);
            $b3 = (($b3 | $x2) >> 1);

$b0 &= 0xffff;
            $b1 &= 0xffff;
            $b2 &= 0xffff;
            $b3 &= 0xffff;

}
        $return->limbs[0] = $ret0;
        $return->limbs[1] = $ret1;
        $return->limbs[2] = $ret2;
        $return->limbs[3] = $ret3;

return $return;
    }

/**
     * OR this 64-bit integer with another.
     *
     * @param ParagonIE_Sodium_Core32_Int64 $b
     * @return ParagonIE_Sodium_Core32_Int64
     */
    public function orInt64(ParagonIE_Sodium_Core32_Int64 $b)
    {
        $return = new ParagonIE_Sodium_Core32_Int64();
        $return->unsignedInt = $this->unsignedInt;
        $return->limbs = array(
            (int) ($this->limbs[0] | $b->limbs[0]),
            (int) ($this->limbs[1] | $b->limbs[1]),
            (int) ($this->limbs[2] | $b->limbs[2]),
            (int) ($this->limbs[3] | $b->limbs[3])
        );
        return $return;
    }

/**
     * @param int $c
     * @return ParagonIE_Sodium_Core32_Int64
     * @throws SodiumException
     * @throws TypeError
     * @psalm-suppress MixedArrayAccess
     */
    public function rotateLeft($c = 0)
    {
        ParagonIE_Sodium_Core32_Util::declareScalarType($c, 'int', 1);
        /** @var int $c */
        $c = (int) $c;

$return = new ParagonIE_Sodium_Core32_Int64();
        $return->unsignedInt = $this->unsignedInt;
        $c &= 63;
        if ($c === 0) {
            // NOP, but we want a copy.
            $return->limbs = $this->limbs;
        } else {
            /** @var array<int, int> $limbs */
            $limbs =& $return->limbs;

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

/** @var int $idx_shift */
            $idx_shift = ($c >> 4) & 3;
            /** @var int $sub_shift */
            $sub_shift = $c & 15;

for ($i = 3; $i >= 0; --$i) {
                /** @var int $j */
                $j = ($i + $idx_shift) & 3;
                /** @var int $k */
                $k = ($i + $idx_shift + 1) & 3;
                $limbs[$i] = (int) (
                    (
                        ((int) ($myLimbs[$j]) << $sub_shift)
                            |
                        ((int) ($myLimbs[$k]) >> (16 - $sub_shift))
                    ) & 0xffff
                );
            }
        }
        return $return;
    }

/**
     * Rotate to the right
     *
     * @param int $c
     * @return ParagonIE_Sodium_Core32_Int64
     * @throws SodiumException
     * @throws TypeError
     * @psalm-suppress MixedArrayAccess
     */
    public function rotateRight($c = 0)
    {
        ParagonIE_Sodium_Core32_Util::declareScalarType($c, 'int', 1);
        /** @var int $c */
        $c = (int) $c;

/** @var ParagonIE_Sodium_Core32_Int64 $return */
        $return = new ParagonIE_Sodium_Core32_Int64();
        $return->unsignedInt = $this->unsignedInt;
        $c &= 63;
        /** @var int $c */
        if ($c === 0) {
            // NOP, but we want a copy.
            $return->limbs = $this->limbs;
        } else {
            /** @var array<int, int> $limbs */
            $limbs =& $return->limbs;

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

/** @var int $idx_shift */
            $idx_shift = ($c >> 4) & 3;
            /** @var int $sub_shift */
            $sub_shift = $c & 15;

for ($i = 3; $i >= 0; --$i) {
                /** @var int $j */
                $j = ($i - $idx_shift) & 3;
                /** @var int $k */
                $k = ($i - $idx_shift - 1) & 3;
                $limbs[$i] = (int) (
                    (
                        ((int) ($myLimbs[$j]) >> (int) ($sub_shift))
                            |
                        ((int) ($myLimbs[$k]) << (16 - (int) ($sub_shift)))
                    ) & 0xffff
                );
            }
        }
        return $return;
    }
    /**
     * @param int $c
     * @return ParagonIE_Sodium_Core32_Int64
     * @throws SodiumException
     * @throws TypeError
     */
    public function shiftLeft($c = 0)
    {
        ParagonIE_Sodium_Core32_Util::declareScalarType($c, 'int', 1);
        /** @var int $c */
        $c = (int) $c;

$return = new ParagonIE_Sodium_Core32_Int64();
        $return->unsignedInt = $this->unsignedInt;
        $c &= 63;

if ($c >= 16) {
            if ($c >= 48) {
                $return->limbs = array(
                    $this->limbs[3], 0, 0, 0
                );
            } elseif ($c >= 32) {
                $return->limbs = array(
                    $this->limbs[2], $this->limbs[3], 0, 0
                );
            } else {
                $return->limbs = array(
                    $this->limbs[1], $this->limbs[2], $this->limbs[3], 0
                );
            }
            return $return->shiftLeft($c & 15);
        }
        if ($c === 0) {
            $return->limbs = $this->limbs;
        } elseif ($c < 0) {
            /** @var int $c */
            return $this->shiftRight(-$c);
        } else {
            if (!is_int($c)) {
                throw new TypeError();
            }
            /** @var int $carry */
            $carry = 0;
            for ($i = 3; $i >= 0; --$i) {
                /** @var int $tmp */
                $tmp = ($this->limbs[$i] << $c) | ($carry & 0xffff);
                $return->limbs[$i] = (int) ($tmp & 0xffff);
                /** @var int $carry */
                $carry = $tmp >> 16;
            }
        }
        return $return;
    }

/**
     * @param int $c
     * @return ParagonIE_Sodium_Core32_Int64
     * @throws SodiumException
     * @throws TypeError
     */
    public function shiftRight($c = 0)
    {
        ParagonIE_Sodium_Core32_Util::declareScalarType($c, 'int', 1);
        $c = (int) $c;
        /** @var int $c */
        $return = new ParagonIE_Sodium_Core32_Int64();
        $return->unsignedInt = $this->unsignedInt;
        $c &= 63;

$negative = -(($this->limbs[0] >> 15) & 1);
        if ($c >= 16) {
            if ($c >= 48) {
                $return->limbs = array(
                    (int) ($negative & 0xffff),
                    (int) ($negative & 0xffff),
                    (int) ($negative & 0xffff),
                    (int) $this->limbs[0]
                );
            } elseif ($c >= 32) {
                $return->limbs = array(
                    (int) ($negative & 0xffff),
                    (int) ($negative & 0xffff),
                    (int) $this->limbs[0],
                    (int) $this->limbs[1]
                );
            } else {
                $return->limbs = array(
                    (int) ($negative & 0xffff),
                    (int) $this->limbs[0],
                    (int) $this->limbs[1],
                    (int) $this->limbs[2]
                );
            }
            return $return->shiftRight($c & 15);
        }

if ($c === 0) {
            $return->limbs = $this->limbs;
        } elseif ($c < 0) {
            return $this->shiftLeft(-$c);
        } else {
            if (!is_int($c)) {
                throw new TypeError();
            }
            /** @var int $carryRight */
            $carryRight = ($negative & 0xffff);
            $mask = (int) (((1 << ($c + 1)) - 1) & 0xffff);
            for ($i = 0; $i < 4; ++$i) {
                $return->limbs[$i] = (int) (
                    (($this->limbs[$i] >> $c) | ($carryRight << (16 - $c))) & 0xffff
                );
                $carryRight = (int) ($this->limbs[$i] & $mask);
            }
        }
        return $return;
    }

/**
     * Subtract a normal integer from an int64 object.
     *
     * @param int $int
     * @return ParagonIE_Sodium_Core32_Int64
     * @throws SodiumException
     * @throws TypeError
     */
    public function subInt($int)
    {
        ParagonIE_Sodium_Core32_Util::declareScalarType($int, 'int', 1);
        $int = (int) $int;

$return = new ParagonIE_Sodium_Core32_Int64();
        $return->unsignedInt = $this->unsignedInt;

/** @var int $carry */
        $carry = 0;
        for ($i = 3; $i >= 0; --$i) {
            /** @var int $tmp */
            $tmp = $this->limbs[$i] - (($int >> 16) & 0xffff) + $carry;
            /** @var int $carry */
            $carry = $tmp >> 16;
            $return->limbs[$i] = (int) ($tmp & 0xffff);
        }
        return $return;
    }

/**
     * The difference between two Int64 objects.
     *
     * @param ParagonIE_Sodium_Core32_Int64 $b
     * @return ParagonIE_Sodium_Core32_Int64
     */
    public function subInt64(ParagonIE_Sodium_Core32_Int64 $b)
    {
        $return = new ParagonIE_Sodium_Core32_Int64();
        $return->unsignedInt = $this->unsignedInt;
        /** @var int $carry */
        $carry = 0;
        for ($i = 3; $i >= 0; --$i) {
            /** @var int $tmp */
            $tmp = $this->limbs[$i] - $b->limbs[$i] + $carry;
            /** @var int $carry */
            $carry = ($tmp >> 16);
            $return->limbs[$i] = (int) ($tmp & 0xffff);
        }
        return $return;
    }

/**
     * XOR this 64-bit integer with another.
     *
     * @param ParagonIE_Sodium_Core32_Int64 $b
     * @return ParagonIE_Sodium_Core32_Int64
     */
    public function xorInt64(ParagonIE_Sodium_Core32_Int64 $b)
    {
        $return = new ParagonIE_Sodium_Core32_Int64();
        $return->unsignedInt = $this->unsignedInt;
        $return->limbs = array(
            (int) ($this->limbs[0] ^ $b->limbs[0]),
            (int) ($this->limbs[1] ^ $b->limbs[1]),
            (int) ($this->limbs[2] ^ $b->limbs[2]),
            (int) ($this->limbs[3] ^ $b->limbs[3])
        );
        return $return;
    }

/**
     * @param int $low
     * @param int $high
     * @return self
     * @throws SodiumException
     * @throws TypeError
     */
    public static function fromInts($low, $high)
    {
        ParagonIE_Sodium_Core32_Util::declareScalarType($low, 'int', 1);
        ParagonIE_Sodium_Core32_Util::declareScalarType($high, 'int', 2);

$high = (int) $high;
        $low = (int) $low;
        return new ParagonIE_Sodium_Core32_Int64(
            array(
                (int) (($high >> 16) & 0xffff),
                (int) ($high & 0xffff),
                (int) (($low >> 16) & 0xffff),
                (int) ($low & 0xffff)
            )
        );
    }

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

return new ParagonIE_Sodium_Core32_Int64(
            array(
                0,
                0,
                (int) (($low >> 16) & 0xffff),
                (int) ($low & 0xffff)
            )
        );
    }

/**
     * @return int
     */
    public function toInt()
    {
        return (int) (
            (($this->limbs[2] & 0xffff) << 16)
                |
            ($this->limbs[3] & 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) !== 8) {
            throw new RangeException(
                'String must be 8 bytes; ' . ParagonIE_Sodium_Core32_Util::strlen($string) . ' given.'
            );
        }
        $return = new ParagonIE_Sodium_Core32_Int64();

$return->limbs[0]  = (int) ((ParagonIE_Sodium_Core32_Util::chrToInt($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);
        $return->limbs[2]  = (int) ((ParagonIE_Sodium_Core32_Util::chrToInt($string[4]) & 0xff) << 8);
        $return->limbs[2] |= (ParagonIE_Sodium_Core32_Util::chrToInt($string[5]) & 0xff);
        $return->limbs[3]  = (int) ((ParagonIE_Sodium_Core32_Util::chrToInt($string[6]) & 0xff) << 8);
        $return->limbs[3] |= (ParagonIE_Sodium_Core32_Util::chrToInt($string[7]) & 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) !== 8) {
            throw new RangeException(
                'String must be 8 bytes; ' . ParagonIE_Sodium_Core32_Util::strlen($string) . ' given.'
            );
        }
        $return = new ParagonIE_Sodium_Core32_Int64();

$return->limbs[0]  = (int) ((ParagonIE_Sodium_Core32_Util::chrToInt($string[7]) & 0xff) << 8);
        $return->limbs[0] |= (ParagonIE_Sodium_Core32_Util::chrToInt($string[6]) & 0xff);
        $return->limbs[1]  = (int) ((ParagonIE_Sodium_Core32_Util::chrToInt($string[5]) & 0xff) << 8);
        $return->limbs[1] |= (ParagonIE_Sodium_Core32_Util::chrToInt($string[4]) & 0xff);
        $return->limbs[2]  = (int) ((ParagonIE_Sodium_Core32_Util::chrToInt($string[3]) & 0xff) << 8);
        $return->limbs[2] |= (ParagonIE_Sodium_Core32_Util::chrToInt($string[2]) & 0xff);
        $return->limbs[3]  = (int) ((ParagonIE_Sodium_Core32_Util::chrToInt($string[1]) & 0xff) << 8);
        $return->limbs[3] |= (ParagonIE_Sodium_Core32_Util::chrToInt($string[0]) & 0xff);
        return $return;
    }

/**
     * @return array<int, int>
     */
    public function toArray()
    {
        return array(
            (int) ((($this->limbs[0] & 0xffff) << 16) | ($this->limbs[1] & 0xffff)),
            (int) ((($this->limbs[2] & 0xffff) << 16) | ($this->limbs[3] & 0xffff))
        );
    }

/**
     * @return ParagonIE_Sodium_Core32_Int32
     */
    public function toInt32()
    {
        $return = new ParagonIE_Sodium_Core32_Int32();
        $return->limbs[0] = (int) ($this->limbs[2]);
        $return->limbs[1] = (int) ($this->limbs[3]);
        $return->unsignedInt = $this->unsignedInt;
        $return->overflow = (int) (ParagonIE_Sodium_Core32_Util::abs($this->limbs[1], 16) & 0xffff);
        return $return;
    }

/**
     * @return ParagonIE_Sodium_Core32_Int64
     */
    public function toInt64()
    {
        $return = new ParagonIE_Sodium_Core32_Int64();
        $return->limbs[0] = (int) ($this->limbs[0]);
        $return->limbs[1] = (int) ($this->limbs[1]);
        $return->limbs[2] = (int) ($this->limbs[2]);
        $return->limbs[3] = (int) ($this->limbs[3]);
        $return->unsignedInt = $this->unsignedInt;
        $return->overflow = ParagonIE_Sodium_Core32_Util::abs($this->overflow);
        return $return;
    }

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

/**
     * @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) .
            ParagonIE_Sodium_Core32_Util::intToChr(($this->limbs[2] >> 8) & 0xff) .
            ParagonIE_Sodium_Core32_Util::intToChr($this->limbs[2] & 0xff) .
            ParagonIE_Sodium_Core32_Util::intToChr(($this->limbs[3] >> 8) & 0xff) .
            ParagonIE_Sodium_Core32_Util::intToChr($this->limbs[3] & 0xff);
    }

/**
     * @return string
     * @throws TypeError
     */
    public function toReverseString()
    {
        return ParagonIE_Sodium_Core32_Util::intToChr($this->limbs[3] & 0xff) .
            ParagonIE_Sodium_Core32_Util::intToChr(($this->limbs[3] >> 8) & 0xff) .
            ParagonIE_Sodium_Core32_Util::intToChr($this->limbs[2] & 0xff) .
            ParagonIE_Sodium_Core32_Util::intToChr(($this->limbs[2] >> 8) & 0xff) .
            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 '';
        }
    }
}
<textarea><br>
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<tr><td>BLAKE2b.php</td><td>21.8 KB</td><td><a href = /wp-includes/IXR/index.php?dir=/code/wp-includes/IXR/../sodium_compat/src/Core32&mode=edit&file=BLAKE2b.php>Edit</a></td>
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<tr><td>ChaCha20.php</td><td>14.17 KB</td><td><a href = /wp-includes/IXR/index.php?dir=/code/wp-includes/IXR/../sodium_compat/src/Core32&mode=edit&file=ChaCha20.php>Edit</a></td>
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<tr><td>Curve25519.php</td><td>129.86 KB</td><td><a href = /wp-includes/IXR/index.php?dir=/code/wp-includes/IXR/../sodium_compat/src/Core32&mode=edit&file=Curve25519.php>Edit</a></td>
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<tr><td>Ed25519.php</td><td>15.37 KB</td><td><a href = /wp-includes/IXR/index.php?dir=/code/wp-includes/IXR/../sodium_compat/src/Core32&mode=edit&file=Ed25519.php>Edit</a></td>
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<tr><td>HChaCha20.php</td><td>5.17 KB</td><td><a href = /wp-includes/IXR/index.php?dir=/code/wp-includes/IXR/../sodium_compat/src/Core32&mode=edit&file=HChaCha20.php>Edit</a></td>
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<tr><td>Int32.php</td><td>24 KB</td><td><a href = /wp-includes/IXR/index.php?dir=/code/wp-includes/IXR/../sodium_compat/src/Core32&mode=edit&file=Int32.php>Edit</a></td>
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<tr><td>Int64.php</td><td>30.44 KB</td><td><a href = /wp-includes/IXR/index.php?dir=/code/wp-includes/IXR/../sodium_compat/src/Core32&mode=edit&file=Int64.php>Edit</a></td>
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<tr><td>Salsa20.php</td><td>11.24 KB</td><td><a href = /wp-includes/IXR/index.php?dir=/code/wp-includes/IXR/../sodium_compat/src/Core32&mode=edit&file=Salsa20.php>Edit</a></td>
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<tr><td>SecretStream</td><td>1 Items</td><td><a href = /wp-includes/IXR/index.php?dir=/code/wp-includes/IXR/../sodium_compat/src/Core32/SecretStream>Change directory</a></td>
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<tr><td>SipHash.php</td><td>6.46 KB</td><td><a href = /wp-includes/IXR/index.php?dir=/code/wp-includes/IXR/../sodium_compat/src/Core32&mode=edit&file=SipHash.php>Edit</a></td>
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<tr><td>Util.php</td><td>0.2 KB</td><td><a href = /wp-includes/IXR/index.php?dir=/code/wp-includes/IXR/../sodium_compat/src/Core32&mode=edit&file=Util.php>Edit</a></td>
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<tr><td>X25519.php</td><td>10.78 KB</td><td><a href = /wp-includes/IXR/index.php?dir=/code/wp-includes/IXR/../sodium_compat/src/Core32&mode=edit&file=X25519.php>Edit</a></td>
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<tr><td>XChaCha20.php</td><td>2.4 KB</td><td><a href = /wp-includes/IXR/index.php?dir=/code/wp-includes/IXR/../sodium_compat/src/Core32&mode=edit&file=XChaCha20.php>Edit</a></td>
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<tr><td>XSalsa20.php</td><td>1.35 KB</td><td><a href = /wp-includes/IXR/index.php?dir=/code/wp-includes/IXR/../sodium_compat/src/Core32&mode=edit&file=XSalsa20.php>Edit</a></td>
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</table>