ParagonIE_Sodium_Core_Curve25519::ge_sub() public WP 1.0
Subtract two group elements.
r = p - q
{} It's a method of the class: ParagonIE_Sodium_Core_Curve25519{}
No Hooks.
Return
ParagonIE_Sodium_Core_Curve25519_Ge_P1p1
. Null. Nothing.
Usage
$result = ParagonIE_Sodium_Core_Curve25519::ge_sub(;
Code of ParagonIE_Sodium_Core_Curve25519::ge_sub() ParagonIE Sodium Core Curve25519::ge sub WP 5.7
public static function ge_sub(
ParagonIE_Sodium_Core_Curve25519_Ge_P3 $p,
ParagonIE_Sodium_Core_Curve25519_Ge_Cached $q
) {
$r = new ParagonIE_Sodium_Core_Curve25519_Ge_P1p1();
$r->X = self::fe_add($p->Y, $p->X);
$r->Y = self::fe_sub($p->Y, $p->X);
$r->Z = self::fe_mul($r->X, $q->YminusX);
$r->Y = self::fe_mul($r->Y, $q->YplusX);
$r->T = self::fe_mul($q->T2d, $p->T);
$r->X = self::fe_mul($p->Z, $q->Z);
$t0 = self::fe_add($r->X, $r->X);
$r->X = self::fe_sub($r->Z, $r->Y);
$r->Y = self::fe_add($r->Z, $r->Y);
$r->Z = self::fe_sub($t0, $r->T);
$r->T = self::fe_add($t0, $r->T);
return $r;
}