ParagonIE_Sodium_Core_Curve25519

16abstract class ParagonIE_Sodium_Core_Curve25519 extends ParagonIE_Sodium_Core_Curve25519_H17{18    /**19     * Get a field element of size 10 with a value of 020     *21     * @internal You should not use this directly from another application22     *23     * @return ParagonIE_Sodium_Core_Curve25519_Fe24     */25    public static function fe_0()26    {27        return new ParagonIE_Sodium_Core_Curve25519_Fe();28    }29 30    /**31     * Get a field element of size 10 with a value of 132     *33     * @internal You should not use this directly from another application34     *35     * @return ParagonIE_Sodium_Core_Curve25519_Fe36     */37    public static function fe_1()38    {39        $fe = new ParagonIE_Sodium_Core_Curve25519_Fe();40        $fe->e0 = 1;41        return $fe;42    }43 44    /**45     * Add two field elements.46     *47     * @internal You should not use this directly from another application48     *49     * @param ParagonIE_Sodium_Core_Curve25519_Fe $f50     * @param ParagonIE_Sodium_Core_Curve25519_Fe $g51     * @return ParagonIE_Sodium_Core_Curve25519_Fe52     * @psalm-suppress MixedAssignment53     * @psalm-suppress MixedOperand54     */55    public static function fe_add(56        ParagonIE_Sodium_Core_Curve25519_Fe $f,57        ParagonIE_Sodium_Core_Curve25519_Fe $g58    ) {59        return new ParagonIE_Sodium_Core_Curve25519_Fe(60            (int)($f->e0 + $g->e0),61            (int)($f->e1 + $g->e1),62            (int)($f->e2 + $g->e2),63            (int)($f->e3 + $g->e3),64            (int)($f->e4 + $g->e4),65            (int)($f->e5 + $g->e5),66            (int)($f->e6 + $g->e6),67            (int)($f->e7 + $g->e7),68            (int)($f->e8 + $g->e8),69            (int)($f->e9 + $g->e9)70        );71    }72 73    /**74     * Constant-time conditional move.75     *76     * @internal You should not use this directly from another application77     *78     * @param ParagonIE_Sodium_Core_Curve25519_Fe $f79     * @param ParagonIE_Sodium_Core_Curve25519_Fe $g80     * @param int $b81     * @return ParagonIE_Sodium_Core_Curve25519_Fe82     * @psalm-suppress MixedAssignment83     */84    public static function fe_cmov(85        ParagonIE_Sodium_Core_Curve25519_Fe $f,86        ParagonIE_Sodium_Core_Curve25519_Fe $g,87        $b = 088    ) {89        $h = new ParagonIE_Sodium_Core_Curve25519_Fe();90        $b *= -1;91        $x = (($f->e0 ^ $g->e0) & $b); $h->e0 = $f->e0 ^ $x;92        $x = (($f->e1 ^ $g->e1) & $b); $h->e1 = $f->e1 ^ $x;93        $x = (($f->e2 ^ $g->e2) & $b); $h->e2 = $f->e2 ^ $x;94        $x = (($f->e3 ^ $g->e3) & $b); $h->e3 = $f->e3 ^ $x;95        $x = (($f->e4 ^ $g->e4) & $b); $h->e4 = $f->e4 ^ $x;