public static function ParagonIE_Sodium_Compat::add in Automatic Updates 7

Same name and namespace in other branches

1. 8 vendor/paragonie/sodium_compat/src/Compat.php \ParagonIE_Sodium_Compat::add()

Add two numbers (little-endian unsigned), storing the value in the first parameter.

This mutates $val.

Parameters

string $val:

string $addv:

Return value

void

Throws

SodiumException

1 call to ParagonIE_Sodium_Compat::add()

php72compat.php in vendor/paragonie/sodium_compat/lib/php72compat.php

File

vendor/paragonie/sodium_compat/src/Compat.php, line 150

Class

ParagonIE_Sodium_Compat

Code

public static function add(&$val, $addv) {
  $val_len = ParagonIE_Sodium_Core_Util::strlen($val);
  $addv_len = ParagonIE_Sodium_Core_Util::strlen($addv);
  if ($val_len !== $addv_len) {
    throw new SodiumException('values must have the same length');
  }
  $A = ParagonIE_Sodium_Core_Util::stringToIntArray($val);
  $B = ParagonIE_Sodium_Core_Util::stringToIntArray($addv);
  $c = 0;
  for ($i = 0; $i < $val_len; $i++) {
    $c += $A[$i] + $B[$i];
    $A[$i] = $c & 0xff;
    $c >>= 8;
  }
  $val = ParagonIE_Sodium_Core_Util::intArrayToString($A);
}