<?php
class ParagonIE_Sodium_Core32_Int32
{
public $limbs = array(0, 0);
public $overflow = 0;
public $unsignedInt = false;
public function __construct($array = array(0, 0), $unsignedInt = false)
{
$this->limbs = array((int) $array[0], (int) $array[1]);
$this->overflow = 0;
$this->unsignedInt = $unsignedInt;
}
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 $return;
}
public function addInt($int)
{
ParagonIE_Sodium_Core32_Util::declareScalarType($int, 'int', 1);
$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 $return;
}
public function compareInt($b = 0)
{
$gt = 0;
$eq = 1;
$i = 2;
$j = 0;
while ($i > 0) {
--$i;
$x1 = $this->limbs[$i];
$x2 = $b >> ($j << 4) & 0xffff;
$gt |= $x2 - $x1 >> 8 & $eq;
$eq &= ($x2 ^ $x1) - 1 >> 8;
}
return $gt + $gt - $eq + 1;
}
public function mask($m = 0)
{
$hi = $m >> 16 & 0xffff;
$lo = $m & 0xffff;
return new ParagonIE_Sodium_Core32_Int32(array((int) ($this->limbs[0] & $hi), (int) ($this->limbs[1] & $lo)), $this->unsignedInt);
}
public function multiplyLong(array $a, array $b, $baseLog2 = 16)
{
$a_l = count($a);
$b_l = count($b);
$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 = $product >> $baseLog2 & 0xffff;
$r[$i + $j] = $product - (int) ($carry * $base) & 0xffff;
$r[$i + $j + 1] += $carry;
}
}
return array_slice($r, 0, 5);
}
public function mulIntFast($int)
{
$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];
}
$res = $this->multiplyLong($a, $b);
if ($aNeg !== $bNeg) {
for ($i = 0; $i < 2; ++$i) {
$res[$i] = (0xffff ^ $res[$i]) & 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] & 0xffff;
}
$return->unsignedInt = $this->unsignedInt;
return $return;
}
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 $return;
}
public function mulInt($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);
}
$int = (int) $int;
$size = (int) $size;
if (!$size) {
$size = 31;
}
$a = clone $this;
$return = new ParagonIE_Sodium_Core32_Int32();
$return->unsignedInt = $this->unsignedInt;
$ret0 = 0;
$ret1 = 0;
$a0 = $a->limbs[0];
$a1 = $a->limbs[1];
for ($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;
}
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;
}
$a = clone $this;
$b = clone $int;
$return = new ParagonIE_Sodium_Core32_Int32();
$return->unsignedInt = $this->unsignedInt;
$ret0 = 0;
$ret1 = 0;
$a0 = $a->limbs[0];
$a1 = $a->limbs[1];
$b0 = $b->limbs[0];
$b1 = $b->limbs[1];
for ($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;
}
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]));
$return->overflow = $this->overflow | $b->overflow;
return $return;
}
public function isGreaterThan($b = 0)
{
return $this->compareInt($b) > 0;
}
public function isLessThanInt($b = 0)
{
return $this->compareInt($b) < 0;
}
public function rotateLeft($c = 0)
{
ParagonIE_Sodium_Core32_Util::declareScalarType($c, 'int', 1);
$c = (int) $c;
$return = new ParagonIE_Sodium_Core32_Int32();
$return->unsignedInt = $this->unsignedInt;
$c &= 31;
if ($c === 0) {
$return->limbs = $this->limbs;
} else {
$idx_shift = $c >> 4 & 1;
$sub_shift = $c & 15;
$limbs =& $return->limbs;
$myLimbs =& $this->limbs;
for ($i = 1; $i >= 0; --$i) {
$j = $i + $idx_shift & 1;
$k = $i + $idx_shift + 1 & 1;
$limbs[$i] = (int) (((int) $myLimbs[$j] << $sub_shift | (int) $myLimbs[$k] >> 16 - $sub_shift) & 0xffff);
}
}
return $return;
}
public function rotateRight($c = 0)
{
ParagonIE_Sodium_Core32_Util::declareScalarType($c, 'int', 1);
$c = (int) $c;
$return = new ParagonIE_Sodium_Core32_Int32();
$return->unsignedInt = $this->unsignedInt;
$c &= 31;
if ($c === 0) {
$return->limbs = $this->limbs;
} else {
$idx_shift = $c >> 4 & 1;
$sub_shift = $c & 15;
$limbs =& $return->limbs;
$myLimbs =& $this->limbs;
for ($i = 1; $i >= 0; --$i) {
$j = $i - $idx_shift & 1;
$k = $i - $idx_shift - 1 & 1;
$limbs[$i] = (int) (((int) $myLimbs[$j] >> (int) $sub_shift | (int) $myLimbs[$k] << 16 - (int) $sub_shift) & 0xffff);
}
}
return $return;
}
public function setUnsignedInt($bool = false)
{
$this->unsignedInt = !empty($bool);
return $this;
}
public function shiftLeft($c = 0)
{
ParagonIE_Sodium_Core32_Util::declareScalarType($c, 'int', 1);
$c = (int) $c;
$return = new ParagonIE_Sodium_Core32_Int32();
$return->unsignedInt = $this->unsignedInt;
$c &= 63;
if ($c === 0) {
$return->limbs = $this->limbs;
} elseif ($c < 0) {
return $this->shiftRight(-$c);
} else {
$tmp = $this->limbs[1] << $c;
$return->limbs[1] = (int) ($tmp & 0xffff);
$carry = $tmp >> 16;
$tmp = $this->limbs[0] << $c | $carry & 0xffff;
$return->limbs[0] = (int) ($tmp & 0xffff);
}
return $return;
}
public function shiftRight($c = 0)
{
ParagonIE_Sodium_Core32_Util::declareScalarType($c, 'int', 1);
$c = (int) $c;
$return = new ParagonIE_Sodium_Core32_Int32();
$return->unsignedInt = $this->unsignedInt;
$c &= 63;
if ($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) {
return $this->shiftLeft(-$c);
} else {
if (!is_int($c)) {
throw new TypeError();
}
$carryLeft = (int) ($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 $return;
}
public function subInt($int)
{
ParagonIE_Sodium_Core32_Util::declareScalarType($int, 'int', 1);
$int = (int) $int;
$return = new ParagonIE_Sodium_Core32_Int32();
$return->unsignedInt = $this->unsignedInt;
$tmp = $this->limbs[1] - ($int & 0xffff);
$carry = $tmp >> 16;
$return->limbs[1] = (int) ($tmp & 0xffff);
$tmp = $this->limbs[0] - ($int >> 16 & 0xffff) + $carry;
$return->limbs[0] = (int) ($tmp & 0xffff);
return $return;
}
public function subInt32(ParagonIE_Sodium_Core32_Int32 $b)
{
$return = new ParagonIE_Sodium_Core32_Int32();
$return->unsignedInt = $this->unsignedInt;
$tmp = $this->limbs[1] - ($b->limbs[1] & 0xffff);
$carry = $tmp >> 16;
$return->limbs[1] = (int) ($tmp & 0xffff);
$tmp = $this->limbs[0] - ($b->limbs[0] & 0xffff) + $carry;
$return->limbs[0] = (int) ($tmp & 0xffff);
return $return;
}
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 $return;
}
public static function fromInt($signed)
{
ParagonIE_Sodium_Core32_Util::declareScalarType($signed, 'int', 1);
$signed = (int) $signed;
return new ParagonIE_Sodium_Core32_Int32(array((int) ($signed >> 16 & 0xffff), (int) ($signed & 0xffff)));
}
public static function fromString($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 $return;
}
public static function fromReverseString($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 $return;
}
public function toArray()
{
return array((int) ($this->limbs[0] << 16 | $this->limbs[1]));
}
public function toString()
{
return ParagonIE_Sodium_Core32_Util::intToChr($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($this->limbs[1] & 0xff);
}
public function toInt()
{
return (int) (($this->limbs[0] & 0xffff) << 16 | $this->limbs[1] & 0xffff);
}
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;
}
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 $return;
}
public function toReverseString()
{
return ParagonIE_Sodium_Core32_Util::intToChr($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);
}
public function __toString()
{
try {
return $this->toString();
} catch (TypeError $ex) {
return '';
}
}
}