Method ReadHeader50

Libraries/unrar/arcread.cpp:549–903

size_t Archive::ReadHeader50()
{
  RawRead Raw(this);

  bool Decrypt=Encrypted && CurBlockPos>(int64)SFXSize+SIZEOF_MARKHEAD5;

  if (Decrypt)
  {
#if defined(RAR_NOCRYPT)
    return 0;
#else

    byte HeadersInitV[SIZE_INITV];
    if (Read(HeadersInitV,SIZE_INITV)!=SIZE_INITV)
    {
      UnexpEndArcMsg();
      return 0;
    }

    // We repeat the password request only for manually entered passwords
    // and not for -p<pwd>. Wrong password can be intentionally provided
    // in -p<pwd> to not stop batch processing for encrypted archives.
    bool GlobalPassword=Cmd->Password.IsSet() || uiIsGlobalPasswordSet();

    while (true) // Repeat the password prompt for wrong passwords.
    {
      RequestArcPassword();

      byte PswCheck[SIZE_PSWCHECK];
      HeadersCrypt.SetCryptKeys(false,CRYPT_RAR50,&Cmd->Password,CryptHead.Salt,HeadersInitV,CryptHead.Lg2Count,NULL,PswCheck);
      // Verify password validity.
      if (CryptHead.UsePswCheck && memcmp(PswCheck,CryptHead.PswCheck,SIZE_PSWCHECK)!=0)
      {
        if (GlobalPassword) // For -p<pwd> or Ctrl+P.
        {
          // This message is used by Android GUI to reset cached passwords.
          // Update appropriate code if changed.
          uiMsg(UIERROR_BADPSW,FileName,FileName);
          FailedHeaderDecryption=true;
          ErrHandler.SetErrorCode(RARX_BADPWD);
          return 0;
        }
        else // For passwords entered manually.
        {
          // This message is used by Android GUI and Windows GUI and SFX to
          // reset cached passwords. Update appropriate code if changed.
          uiMsg(UIWAIT_BADPSW,FileName,FileName);
          Cmd->Password.Clean();
        }

#ifdef RARDLL
        // Avoid new requests for unrar.dll to prevent the infinite loop
        // if app always returns the same password.
        ErrHandler.SetErrorCode(RARX_BADPWD);
        Cmd->DllError=ERAR_BAD_PASSWORD;
        ErrHandler.Exit(RARX_BADPWD);
#else
        continue; // Request a password again.