Method checkPrivKey

Vanity.cpp:772–828

// ----------------------------------------------------------------------------

bool VanitySearch::checkPrivKey(string addr, Int &key, int32_t incr, int endomorphism, bool mode) {

  Int k(&key);
  Point sp = startPubKey;

  if (incr < 0) {
    k.Add((uint64_t)(-incr));
    k.Neg();
    k.Add(&secp->order);
    if (startPubKeySpecified) sp.y.ModNeg();
  } else {
    k.Add((uint64_t)incr);
  }

  // Endomorphisms
  switch (endomorphism) {
  case 1:
    k.ModMulK1order(&lambda);
    if(startPubKeySpecified) sp.x.ModMulK1(&beta);
    break;
  case 2:
    k.ModMulK1order(&lambda2);
    if (startPubKeySpecified) sp.x.ModMulK1(&beta2);
    break;
  }

  // Check addresses
  Point p = secp->ComputePublicKey(&k);
  if (startPubKeySpecified) p = secp->AddDirect(p, sp);

  string chkAddr = secp->GetAddress(searchType, mode, p);
  if (chkAddr != addr) {

    //Key may be the opposite one (negative zero or compressed key)
    k.Neg();
    k.Add(&secp->order);
    p = secp->ComputePublicKey(&k);
    if (startPubKeySpecified) {
      sp.y.ModNeg();
      p = secp->AddDirect(p, sp);
    }
    string chkAddr = secp->GetAddress(searchType, mode, p);
    if (chkAddr != addr) {
      printf("\nWarning, wrong private key generated !\n");
      printf("  Addr :%s\n", addr.c_str());
      printf("  Check:%s\n", chkAddr.c_str());
      printf("  Endo:%d incr:%d comp:%d\n", endomorphism, incr, mode);
      return false;
    }

  }

  output(addr, secp->GetPrivAddress(mode ,k), k.GetBase16());

  return true;

}