public function ParagonIE_Sodium_Core32_Int64::rotateLeft in Automatic Updates 7

Same name and namespace in other branches

1. 8 vendor/paragonie/sodium_compat/src/Core32/Int64.php \ParagonIE_Sodium_Core32_Int64::rotateLeft()

@psalm-suppress MixedArrayAccess

Parameters

int $c:

Return value

ParagonIE_Sodium_Core32_Int64

Throws

SodiumException

TypeError

File

vendor/paragonie/sodium_compat/src/Core32/Int64.php, line 581

Class

ParagonIE_Sodium_Core32_Int64

Class ParagonIE_Sodium_Core32_Int64

Code

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;
}