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Windows: Implement GUI indicator for entropy collected from mouse movements.

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This commit is contained in:
Mounir IDRASSI
2016-01-31 20:28:00 +01:00
parent b407512248
commit 77885de85e
10 changed files with 284 additions and 60 deletions
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85
src/ExpandVolume/DlgExpandVolume.cpp
View File

@@ -240,6 +240,14 @@ BOOL CALLBACK ExpandVolProgressDlgProc (HWND hwndDlg, UINT msg, WPARAM wParam, L
static EXPAND_VOL_THREAD_PARAMS *pProgressDlgParam;
static BOOL bVolTransformStarted = FALSE;
static BOOL showRandPool = TRUE;
static unsigned char randPool[16];
static unsigned char maskRandPool [16];
static BOOL bUseMask = FALSE;
static DWORD mouseEntropyGathered = 0xFFFFFFFF;
static DWORD mouseEventsInitialCount = 0;
/* max value of entropy needed to fill all random pool = 8 * RNG_POOL_SIZE = 2560 bits */
static const DWORD maxEntropyLevel = RNG_POOL_SIZE * 8;
static HWND hEntropyBar = NULL;
WORD lw = LOWORD (wParam);
@@ -248,14 +256,29 @@ BOOL CALLBACK ExpandVolProgressDlgProc (HWND hwndDlg, UINT msg, WPARAM wParam, L
case WM_INITDIALOG:
{
wchar_t szOldHostSize[512], szNewHostSize[512];
HCRYPTPROV hRngProv;
pProgressDlgParam = (EXPAND_VOL_THREAD_PARAMS*)lParam;
bVolTransformStarted = FALSE;
showRandPool = TRUE;
showRandPool = FALSE;
hCurPage = hwndDlg;
nPbar = IDC_PROGRESS_BAR;
VirtualLock (randPool, sizeof(randPool));
VirtualLock (&mouseEntropyGathered, sizeof(mouseEntropyGathered));
VirtualLock (maskRandPool, sizeof(maskRandPool));
mouseEntropyGathered = 0xFFFFFFFF;
mouseEventsInitialCount = 0;
bUseMask = FALSE;
if (CryptAcquireContext (&hRngProv, NULL, MS_ENHANCED_PROV, PROV_RSA_FULL, CRYPT_VERIFYCONTEXT | CRYPT_SILENT))
{
if (CryptGenRandom (hRngProv, sizeof (maskRandPool), maskRandPool))
bUseMask = TRUE;
CryptReleaseContext (hRngProv, 0);
}
GetSpaceString(szOldHostSize,sizeof(szOldHostSize),pProgressDlgParam->oldSize,pProgressDlgParam->bIsDevice);
GetSpaceString(szNewHostSize,sizeof(szNewHostSize),pProgressDlgParam->newSize,pProgressDlgParam->bIsDevice);
@@ -283,6 +306,9 @@ BOOL CALLBACK ExpandVolProgressDlgProc (HWND hwndDlg, UINT msg, WPARAM wParam, L
}
SendMessage (GetDlgItem (hwndDlg, IDC_DISPLAY_POOL_CONTENTS), BM_SETCHECK, showRandPool ? BST_CHECKED : BST_UNCHECKED, 0);
hEntropyBar = GetDlgItem (hwndDlg, IDC_ENTROPY_BAR);
SendMessage (hEntropyBar, PBM_SETRANGE32, 0, maxEntropyLevel);
SendMessage (hEntropyBar, PBM_SETSTEP, 1, 0);
SetTimer (hwndDlg, TIMER_ID_RANDVIEW, TIMER_INTERVAL_RANDVIEW, NULL);
}
return 0;
@@ -315,20 +341,56 @@ BOOL CALLBACK ExpandVolProgressDlgProc (HWND hwndDlg, UINT msg, WPARAM wParam, L
{
case TIMER_ID_RANDVIEW:
{
unsigned char tmp[16] = {0};
wchar_t szRndPool[64] = {0};
DWORD mouseEventsCounter;
if (!showRandPool)
return 1;
RandpeekBytes (hwndDlg, randPool, sizeof (randPool),&mouseEventsCounter);
RandpeekBytes (hwndDlg, tmp, sizeof (tmp));
/* conservative estimate: 1 mouse move event brings 1 bit of entropy
* https://security.stackexchange.com/questions/32844/for-how-much-time-should-i-randomly-move-the-mouse-for-generating-encryption-key/32848#32848
*/
if (mouseEntropyGathered == 0xFFFFFFFF)
{
mouseEventsInitialCount = mouseEventsCounter;
mouseEntropyGathered = 0;
}
else
{
if ( mouseEntropyGathered < maxEntropyLevel
&& (mouseEventsCounter >= mouseEventsInitialCount)
&& (mouseEventsCounter - mouseEventsInitialCount) <= maxEntropyLevel)
mouseEntropyGathered = mouseEventsCounter - mouseEventsInitialCount;
else
mouseEntropyGathered = maxEntropyLevel;
StringCbPrintfW (szRndPool, sizeof(szRndPool), L"%08X%08X%08X%08X",
*((DWORD*) (tmp + 12)), *((DWORD*) (tmp + 8)), *((DWORD*) (tmp + 4)), *((DWORD*) (tmp)));
SendMessage (hEntropyBar, PBM_SETPOS,
(WPARAM) (mouseEntropyGathered),
0);
}
if (showRandPool)
StringCbPrintfW (szRndPool, sizeof(szRndPool), L"%08X%08X%08X%08X",
*((DWORD*) (randPool + 12)), *((DWORD*) (randPool + 8)), *((DWORD*) (randPool + 4)), *((DWORD*) (randPool)));
else if (bUseMask)
{
for (int i = 0; i < 16; i++)
{
wchar_t tmp2[3];
unsigned char tmpByte = randPool[i] ^ maskRandPool[i];
tmp2[0] = (wchar_t) (((tmpByte >> 4) % 6) + L'*');
tmp2[1] = (wchar_t) (((tmpByte & 0x0F) % 6) + L'*');
tmp2[2] = 0;
StringCbCatW (szRndPool, sizeof(szRndPool), tmp2);
}
}
else
{
wmemset (szRndPool, L'*', 32);
}
SetWindowText (GetDlgItem (hwndDlg, IDC_RANDOM_BYTES), szRndPool);
burn (tmp, sizeof(tmp));
burn (randPool, sizeof(randPool));
burn (szRndPool, sizeof(szRndPool));
}
return 1;
@@ -382,6 +444,13 @@ BOOL CALLBACK ExpandVolProgressDlgProc (HWND hwndDlg, UINT msg, WPARAM wParam, L
}
return 0;
case WM_NCDESTROY:
burn (randPool, sizeof (randPool));
burn (&mouseEventsInitialCount, sizeof(mouseEventsInitialCount));
burn (&mouseEntropyGathered, sizeof(mouseEntropyGathered));
burn (maskRandPool, sizeof(maskRandPool));
return 0;
}
return 0;

16
src/ExpandVolume/ExpandVolume.rc
View File

@@ -100,7 +100,7 @@ BEGIN
LTEXT "(Empty or 0 for default iterations)",IDC_PIM_HELP,115,46,189,8,NOT WS_VISIBLE
END
IDD_EXPAND_PROGRESS_DLG DIALOGEX 0, 0, 376, 271
IDD_EXPAND_PROGRESS_DLG DIALOGEX 0, 0, 376, 283
STYLE DS_SETFONT | DS_MODALFRAME | DS_FIXEDSYS | WS_POPUP | WS_CAPTION | WS_SYSMENU
CAPTION "VeraCrypt Expander"
FONT 8, "MS Shell Dlg", 0, 0, 0x0
@@ -120,16 +120,18 @@ BEGIN
RTEXT "Volume: ",IDT_VOL_NAME,31,16,42,8
GROUPBOX "",IDC_STATIC,15,7,346,72
CONTROL "",IDC_EXPAND_VOLUME_NAME,"Static",SS_SIMPLE | WS_GROUP,80,16,275,8,WS_EX_TRANSPARENT
DEFPUSHBUTTON "Continue",IDOK,15,238,84,18
PUSHBUTTON "Cancel",IDCANCEL,277,238,84,18
EDITTEXT IDC_BOX_STATUS,15,162,346,66,ES_MULTILINE | ES_AUTOVSCROLL | ES_READONLY | ES_WANTRETURN | WS_VSCROLL
DEFPUSHBUTTON "Continue",IDOK,15,247,84,18
PUSHBUTTON "Cancel",IDCANCEL,277,247,84,18
EDITTEXT IDC_BOX_STATUS,15,176,346,66,ES_MULTILINE | ES_AUTOVSCROLL | ES_READONLY | ES_WANTRETURN | WS_VSCROLL
CONTROL "",IDC_EXPAND_VOLUME_INITSPACE,"Static",SS_SIMPLE | WS_GROUP,80,64,275,8,WS_EX_TRANSPARENT
RTEXT "Fill new space: ",IDT_INIT_SPACE,20,64,53,8
RTEXT "File system: ",IDT_FILE_SYS,31,28,42,8
CONTROL "",IDC_EXPAND_FILE_SYSTEM,"Static",SS_SIMPLE | WS_GROUP,80,28,275,8,WS_EX_TRANSPARENT
RTEXT "Random Pool: ",IDT_RANDOM_POOL2,20,144,53,8
CONTROL "",IDC_RANDOM_BYTES,"Static",SS_SIMPLE | WS_GROUP,80,144,149,8,WS_EX_TRANSPARENT
CONTROL "",IDC_DISPLAY_POOL_CONTENTS,"Button",BS_AUTOCHECKBOX | WS_TABSTOP,236,142,14,12
CONTROL "Display pool content",IDC_DISPLAY_POOL_CONTENTS,"Button",BS_AUTOCHECKBOX | WS_TABSTOP,236,142,125,12
GROUPBOX "Randomness Collected From Mouse Movements",IDT_ENTROPY_BAR,20,156,214,18
CONTROL "",IDC_ENTROPY_BAR,"msctls_progress32",WS_BORDER,31,165,193,6
END
@@ -170,8 +172,8 @@ BEGIN
VERTGUIDE, 80
VERTGUIDE, 355
TOPMARGIN, 9
BOTTOMMARGIN, 256
HORZGUIDE, 162
BOTTOMMARGIN, 268
HORZGUIDE, 176
END
END
#endif // APSTUDIO_INVOKED