public static function ParagonIE_Sodium_Core_Curve25519::ge_add in Automatic Updates 7

Same name and namespace in other branches

1. 8 vendor/paragonie/sodium_compat/src/Core/Curve25519.php \ParagonIE_Sodium_Core_Curve25519::ge_add()

Add two group elements.

r = p + q

@internal You should not use this directly from another application

Parameters

ParagonIE_Sodium_Core_Curve25519_Ge_P3 $p:

ParagonIE_Sodium_Core_Curve25519_Ge_Cached $q:

Return value

ParagonIE_Sodium_Core_Curve25519_Ge_P1p1

2 calls to ParagonIE_Sodium_Core_Curve25519::ge_add()

ParagonIE_Sodium_Core_Curve25519::ge_double_scalarmult_vartime in vendor/paragonie/sodium_compat/src/Core/Curve25519.php

@internal You should not use this directly from another application

ParagonIE_Sodium_Core_Curve25519::ge_mul_l in vendor/paragonie/sodium_compat/src/Core/Curve25519.php

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

File

vendor/paragonie/sodium_compat/src/Core/Curve25519.php, line 1254

Class

ParagonIE_Sodium_Core_Curve25519

Class ParagonIE_Sodium_Core_Curve25519

Code

public static function ge_add(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->YplusX);
  $r->Y = self::fe_mul($r->Y, $q->YminusX);
  $r->T = self::fe_mul($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);
  $r->Z = self::fe_add($t0, $r->T);
  $r->T = self::fe_sub($t0, $r->T);
  return $r;
}