public function ParagonIE_Sodium_Core32_Int64::shiftLeft 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::shiftLeft()

Parameters

int $c:

Return value

ParagonIE_Sodium_Core32_Int64

Throws

SodiumException

TypeError

1 call to ParagonIE_Sodium_Core32_Int64::shiftLeft()

ParagonIE_Sodium_Core32_Int64::shiftRight in vendor/paragonie/sodium_compat/src/Core32/Int64.php

File

vendor/paragonie/sodium_compat/src/Core32/Int64.php, line 679

Class

ParagonIE_Sodium_Core32_Int64

Class ParagonIE_Sodium_Core32_Int64

Code

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;
}