ParagonIE_Sodium_Core_Curve25519::ge_mul_l() public WP 1.0

multiply by the order of the main subgroup l = 2^252+27742317777372353535851937790883648493

{} It's a method of the class: ParagonIE_Sodium_Core_Curve25519{}

No Hooks.

Return

ParagonIE_Sodium_Core_Curve25519_Ge_P3. Null. Nothing.

Usage

$result = ParagonIE_Sodium_Core_Curve25519::ge_mul_l( $A );

$A(ParagonIE_Sodium_Core_Curve25519_Ge_P3) (required)

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Code of ParagonIE_Sodium_Core_Curve25519::ge_mul_l() ParagonIE Sodium Core Curve25519::ge mul l ^{WP 5.7}

<?php
public static function ge_mul_l(ParagonIE_Sodium_Core_Curve25519_Ge_P3 $A)
{
    /** @var array<int, int> $aslide */
    $aslide = array(
        13, 0, 0, 0, 0, -1, 0, 0, 0, 0, -11, 0, 0, 0, 0, 0, 0, -5, 0, 0, 0,
        0, 0, 0, -3, 0, 0, 0, 0, -13, 0, 0, 0, 0, 7, 0, 0, 0, 0, 0, 3, 0,
        0, 0, 0, -13, 0, 0, 0, 0, 5, 0, 0, 0, 0, 0, 0, 0, 0, 11, 0, 0, 0,
        0, 0, 11, 0, 0, 0, 0, -13, 0, 0, 0, 0, 0, 0, -3, 0, 0, 0, 0, 0, -1,
        0, 0, 0, 0, 3, 0, 0, 0, 0, -11, 0, 0, 0, 0, 0, 0, 0, 15, 0, 0, 0,
        0, 0, -1, 0, 0, 0, 0, -1, 0, 0, 0, 0, 7, 0, 0, 0, 0, 5, 0, 0, 0, 0,
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1
    );

    /** @var array<int, ParagonIE_Sodium_Core_Curve25519_Ge_Cached> $Ai size 8 */
    $Ai = array();

    # ge_p3_to_cached(&Ai[0], A);
    $Ai[0] = self::ge_p3_to_cached($A);
    # ge_p3_dbl(&t, A);
    $t = self::ge_p3_dbl($A);
    # ge_p1p1_to_p3(&A2, &t);
    $A2 = self::ge_p1p1_to_p3($t);

    for ($i = 1; $i < 8; ++$i) {
        # ge_add(&t, &A2, &Ai[0]);
        $t = self::ge_add($A2, $Ai[$i - 1]);
        # ge_p1p1_to_p3(&u, &t);
        $u = self::ge_p1p1_to_p3($t);
        # ge_p3_to_cached(&Ai[i], &u);
        $Ai[$i] = self::ge_p3_to_cached($u);
    }

    $r = self::ge_p3_0();
    for ($i = 252; $i >= 0; --$i) {
        $t = self::ge_p3_dbl($r);
        if ($aslide[$i] > 0) {
            # ge_p1p1_to_p3(&u, &t);
            $u = self::ge_p1p1_to_p3($t);
            # ge_add(&t, &u, &Ai[aslide[i] / 2]);
            $t = self::ge_add($u, $Ai[(int)($aslide[$i] / 2)]);
        } elseif ($aslide[$i] < 0) {
            # ge_p1p1_to_p3(&u, &t);
            $u = self::ge_p1p1_to_p3($t);
            # ge_sub(&t, &u, &Ai[(-aslide[i]) / 2]);
            $t = self::ge_sub($u, $Ai[(int)(-$aslide[$i] / 2)]);
        }
    }

    # ge_p1p1_to_p3(r, &t);
    return self::ge_p1p1_to_p3($t);
}