ParagonIE_Sodium_Core32_Curve25519::ge_select( int $pos = 0, int $b = 0 ): ParagonIE_Sodium_Core32_Curve25519_Ge_Precomp

Compatibility

Present in every tracked release (6.7.7 to 7.1.0), and compiles on PHP 7.4 through 8.6-dev.

Parameters

$posintoptional

Default: 0

$bintoptional

Default: 0

Return value

ParagonIE_Sodium_Core32_Curve25519_Ge_Precomp

Performance profile

How much work a call to ParagonIE_Sodium_Core32_Curve25519::ge_select() does, and what it touches: the algorithmic scaling, the Zend instruction count per call across PHP versions, the hooks it hands control to, and the core code that calls it. Measured from the compiled opcodes, not a stopwatch, so every number is identical on any machine running the same PHP version, and every function in core is ranked by cost.

Cost class

Light

Touches nothing outside its own arguments.

Scaling

Scales with input

The body loops, so the work grows with what you pass in.

Instructions

11–59

Executed per call on PHP 8.5, depending on the branch taken. The body compiles to 347.

Plugin surface

None

Nothing here hands control to plugin code.

Called by

1

1 place in core call this, so the cost is paid more often than your own code shows.

What one call costs · 2 distinct outcomes

One number would be a lie: the work depends on which branch runs. These are every distinct cost ParagonIE_Sodium_Core32_Curve25519::ge_select() can have, taken from its control-flow graph on PHP 8.5.

Uses · 11

• ParagonIE_Sodium_Core32_Curve25519_Ge_Precomp::__construct()ParagonIE_Sodium_Core32_Curve25519_Ge_Precomp constructor.
• ParagonIE_Sodium_Core32_Curve25519_Fe::fromArray()
• ParagonIE_Sodium_Core32_Int32::fromInt()
• InvalidArgumentException::__construct()
• RangeException::__construct()
• ParagonIE_Sodium_Core32_Curve25519::negative()
• ParagonIE_Sodium_Core32_Curve25519::ge_precomp_0()
• ParagonIE_Sodium_Core32_Curve25519::cmov()Conditional move
• ParagonIE_Sodium_Core32_Curve25519::equal()
• ParagonIE_Sodium_Core32_Curve25519::fe_copy()Create a copy of a field element.
• ParagonIE_Sodium_Core32_Curve25519::fe_neg()Get the negative values for each piece of the field element.

Used by · 1

• ParagonIE_Sodium_Core32_Curve25519::ge_scalarmult_base()

Source code

View on Trac ↗View on GitHub ↗

1866    public static function ge_select($pos = 0, $b = 0)1867    {1868        static $base = null;1869        if ($base === null) {1870            $base = array();1871            foreach (self::$base as $i => $bas) {1872                for ($j = 0; $j < 8; ++$j) {1873                    $base[$i][$j] = new ParagonIE_Sodium_Core32_Curve25519_Ge_Precomp(1874                        ParagonIE_Sodium_Core32_Curve25519_Fe::fromArray(1875                            array(1876                                ParagonIE_Sodium_Core32_Int32::fromInt($bas[$j][0][0]),1877                                ParagonIE_Sodium_Core32_Int32::fromInt($bas[$j][0][1]),1878                                ParagonIE_Sodium_Core32_Int32::fromInt($bas[$j][0][2]),1879                                ParagonIE_Sodium_Core32_Int32::fromInt($bas[$j][0][3]),1880                                ParagonIE_Sodium_Core32_Int32::fromInt($bas[$j][0][4]),1881                                ParagonIE_Sodium_Core32_Int32::fromInt($bas[$j][0][5]),1882                                ParagonIE_Sodium_Core32_Int32::fromInt($bas[$j][0][6]),1883                                ParagonIE_Sodium_Core32_Int32::fromInt($bas[$j][0][7]),1884                                ParagonIE_Sodium_Core32_Int32::fromInt($bas[$j][0][8]),1885                                ParagonIE_Sodium_Core32_Int32::fromInt($bas[$j][0][9])1886                            )1887                        ),1888                        ParagonIE_Sodium_Core32_Curve25519_Fe::fromArray(1889                            array(1890                                ParagonIE_Sodium_Core32_Int32::fromInt($bas[$j][1][0]),1891                                ParagonIE_Sodium_Core32_Int32::fromInt($bas[$j][1][1]),1892                                ParagonIE_Sodium_Core32_Int32::fromInt($bas[$j][1][2]),1893                                ParagonIE_Sodium_Core32_Int32::fromInt($bas[$j][1][3]),1894                                ParagonIE_Sodium_Core32_Int32::fromInt($bas[$j][1][4]),1895                                ParagonIE_Sodium_Core32_Int32::fromInt($bas[$j][1][5]),1896                                ParagonIE_Sodium_Core32_Int32::fromInt($bas[$j][1][6]),1897                                ParagonIE_Sodium_Core32_Int32::fromInt($bas[$j][1][7]),1898                                ParagonIE_Sodium_Core32_Int32::fromInt($bas[$j][1][8]),1899                                ParagonIE_Sodium_Core32_Int32::fromInt($bas[$j][1][9])1900                            )1901                        ),1902                        ParagonIE_Sodium_Core32_Curve25519_Fe::fromArray(1903                            array(1904                                ParagonIE_Sodium_Core32_Int32::fromInt($bas[$j][2][0]),1905                                ParagonIE_Sodium_Core32_Int32::fromInt($bas[$j][2][1]),1906                                ParagonIE_Sodium_Core32_Int32::fromInt($bas[$j][2][2]),1907                                ParagonIE_Sodium_Core32_Int32::fromInt($bas[$j][2][3]),1908                                ParagonIE_Sodium_Core32_Int32::fromInt($bas[$j][2][4]),1909                                ParagonIE_Sodium_Core32_Int32::fromInt($bas[$j][2][5]),1910                                ParagonIE_Sodium_Core32_Int32::fromInt($bas[$j][2][6]),1911                                ParagonIE_Sodium_Core32_Int32::fromInt($bas[$j][2][7]),1912                                ParagonIE_Sodium_Core32_Int32::fromInt($bas[$j][2][8]),1913                                ParagonIE_Sodium_Core32_Int32::fromInt($bas[$j][2][9])1914                            )1915                        )1916                    );1917                }1918            }1919        }1920        if (!is_int($pos)) {1921            throw new InvalidArgumentException('Position must be an integer');1922        }1923        if ($pos < 0 || $pos > 31) {1924            throw new RangeException('Position is out of range [0, 31]');1925        }1926 1927        $bnegative = self::negative($b);1928        $babs = $b - (((-$bnegative) & $b) << 1);1929 1930        $t = self::ge_precomp_0();1931        for ($i = 0; $i < 8; ++$i) {1932            $t = self::cmov(1933                $t,1934                $base[$pos][$i],1935                -self::equal($babs, $i + 1)1936            );1937        }1938        $minusT = new ParagonIE_Sodium_Core32_Curve25519_Ge_Precomp(1939            self::fe_copy($t->yminusx),1940            self::fe_copy($t->yplusx),1941            self::fe_neg($t->xy2d)1942        );1943        return self::cmov($t, $minusT, -$bnegative);1944    }

Changelog

Unchanged from 6.7.7 through 7.1.0.

1. 6.7.7
2. 6.8.8
3. 6.9.7
4. 7.0.4
5. 7.1.0

Signature, return type and hooks compared across 5 parsed releases.

About this page

Parsed data

Generated from the wordpress-develop 7.1.0 tag, from src/wp-includes/sodium_compat/src/Core32/Curve25519.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.

Corrections

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