Programming Forums > Application Development > C

magnus.therning · May 11th, 2006, 11:47 AM

How do I go about calling SecureZeroMemory from a program compiled with MinGW?

It seems the function isn't in the distributed header files, so I declared it myself. Then it fails on linking.

nnxion · May 11th, 2006, 1:09 PM

It's declared in Winbase.h which is a define for RtlSecureZeroMemory in WinNT.h, which is declared like:

(Toggle Plain Text)

#if !defined(MIDL_PASS)

FORCEINLINE
PVOID
RtlSecureZeroMemory(
    IN PVOID ptr,
    IN SIZE_T cnt
    )
{
    volatile char *vptr = (volatile char *)ptr;

#if defined(_M_AMD64)

        __stosb((PBYTE )((DWORD64)vptr), 0, cnt);

#else

    while (cnt) {
        *vptr = 0;
        vptr++;
        cnt--;
    }

#endif

    return ptr;
}

#endif

__stosb is a function to store strings as bytes.

(Toggle Plain Text)

VOID
__stosb (
    IN PBYTE  Destination,
    IN BYTE  Value,
    IN SIZE_T Count
    );

May 11th, 2006, 11:47 AM	#1
magnus.therning Programmer Join Date: May 2006 Location: Cambridge, UK Posts: 56 Rep Power: 3	MinGW and SecureZeroMemory How do I go about calling SecureZeroMemory from a program compiled with MinGW? It seems the function isn't in the distributed header files, so I declared it myself. Then it fails on linking. __________________ Don't comment bad code - rewrite it. - The Elements of Programming Style (Kernighan & Plaugher)

May 11th, 2006, 1:09 PM	#2
nnxion Programming Guru Join Date: Jun 2005 Location: elemental plane Posts: 1,429 Rep Power: 5	It's declared in Winbase.h which is a define for RtlSecureZeroMemory in WinNT.h, which is declared like: (Toggle Plain Text) #if !defined(MIDL_PASS) FORCEINLINE PVOID RtlSecureZeroMemory( IN PVOID ptr, IN SIZE_T cnt ) { volatile char vptr = (volatile char )ptr; #if defined(_M_AMD64) __stosb((PBYTE )((DWORD64)vptr), 0, cnt); #else while (cnt) { vptr = 0; vptr++; cnt--; } #endif return ptr; } #endif #if !defined(MIDL_PASS) FORCEINLINE PVOID RtlSecureZeroMemory( IN PVOID ptr, IN SIZE_T cnt ) { volatile char vptr = (volatile char )ptr; #if defined(_M_AMD64) __stosb((PBYTE )((DWORD64)vptr), 0, cnt); #else while (cnt) { vptr = 0; vptr++; cnt--; } #endif return ptr; } #endif __stosb is a function to store strings as bytes. (Toggle Plain Text) VOID __stosb ( IN PBYTE Destination, IN BYTE Value, IN SIZE_T Count ); VOID __stosb ( IN PBYTE Destination, IN BYTE Value, IN SIZE_T Count ); __________________ "Employ your time in improving yourself by other men's writings, so that you shall gain easily what others have labored hard for." -- Socrates

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Programming Forums > Application Development > C

MinGW and SecureZeroMemory