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

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Description

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

This mutates $val.

Usage

$void = ParagonIE_Sodium_Compat::sub( $val, $addv );

Parameters

$val
( string ) required
$addv
( string ) required

Returns

void

Source

File name: wordpress/wp-includes/sodium_compat/src/Compat.php
Lines:

1 to 18 of 18
    public static function sub(&$val, $addv)
    {
        $val_len = ParagonIE_Sodium_Core_Util::ParagonIE_Sodium_Core_Util::strlen($val);
        $addv_len = ParagonIE_Sodium_Core_Util::ParagonIE_Sodium_Core_Util::strlen($addv);
        if ($val_len !== $addv_len) {
            throw new SodiumException('values must have the same length');
        }
        $A = ParagonIE_Sodium_Core_Util::ParagonIE_Sodium_Core_Util::stringToIntArray($val);
        $B = ParagonIE_Sodium_Core_Util::ParagonIE_Sodium_Core_Util::stringToIntArray($addv);

        $c = 0;
        for ($i = 0; $i < $val_len; $i++) {
            $c = ($A[$i] - $B[$i] - $c);
            $A[$i] = ($c & 0xff);
            $c = ($c >> 8) & 1;
        }
        $val = ParagonIE_Sodium_Core_Util::ParagonIE_Sodium_Core_Util::intArrayToString($A);
    }
 

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