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// Checksum Tool
// Version 1.0
// By Bio (C) 2012
#define WIN32_LEAN_AND_MEAN // Exclude rarely-used stuff from Windows headers
#include <io.h>
#include <stdio.h>
#include <stdlib.h>
#include <windows.h>
#include <m_core.h>
#define DEBUG_MSGS 1
#define DEBUG_ARCH 1
// #define DEBUG_SECTIONS 1
// Return codes
#define RESULT_OK 0
#define RESULT_NOTFOUND 10
#define RESULT_READERROR 20
#define RESULT_NOTPE 30
#define RESULT_CORRUPTED 40
#define RESULT_INVALID 50
#define RESULT_NONE 100
int PEChecksum(TCHAR *filename, mir_md5_byte_t digest[16])
{
HANDLE hFile = INVALID_HANDLE_VALUE;
HANDLE hMap;
PBYTE ptr = 0;
int res = RESULT_OK;
DWORD size;
DWORD hsize = 0;
WORD machine = 0;
DWORD sections = 0;
hFile = CreateFile( filename, GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, 0, NULL );
if ( hFile == INVALID_HANDLE_VALUE ) {
return RESULT_NOTFOUND;
}
// check minimum and maximum size
size = GetFileSize(hFile, &hsize);
if ( !size || size == INVALID_FILE_SIZE || hsize )
{
CloseHandle( hFile );
return RESULT_INVALID;
}
if ( size < sizeof(IMAGE_DOS_HEADER) + sizeof(IMAGE_NT_HEADERS) )
{
CloseHandle( hFile );
return RESULT_NOTPE;
}
hMap = CreateFileMapping( hFile, NULL, PAGE_READONLY, 0, 0, NULL );
if (hMap)
ptr = (PBYTE)MapViewOfFile(hMap, FILE_MAP_READ, 0, 0 ,0);
if (ptr)
{
PIMAGE_DOS_HEADER pIDH = 0;
PIMAGE_NT_HEADERS pINTH = 0;
PIMAGE_SECTION_HEADER pISH = 0;
pIDH = (PIMAGE_DOS_HEADER)ptr;
if ( pIDH->e_magic == IMAGE_DOS_SIGNATURE )
pINTH = (PIMAGE_NT_HEADERS)( ptr + pIDH->e_lfanew );
if ( !pINTH)
res = RESULT_NOTPE;
else
if ( (PBYTE)pINTH + sizeof(IMAGE_NT_HEADERS) >= ptr + size )
res = RESULT_CORRUPTED;
else
if ( pINTH->Signature != IMAGE_NT_SIGNATURE )
res = RESULT_NOTPE;
else
{
machine = pINTH->FileHeader.Machine;
#if defined(DEBUG_ARCH) && defined(DEBUG_MSGS)
switch(machine)
{
case IMAGE_FILE_MACHINE_I386:
fprintf( stdout, "(x86) ");
break;
case IMAGE_FILE_MACHINE_AMD64:
fprintf( stdout, "(x64) ");
break;
case IMAGE_FILE_MACHINE_IA64:
fprintf( stdout, "(IA64 :-) ");
break;
default:
fprintf( stdout, "(unknown) ");
break;
}
#endif
sections = pINTH->FileHeader.NumberOfSections;
if ( !sections )
res = RESULT_INVALID;
else
{
DWORD idx = 0;
mir_md5_state_t pms;
mir_md5_init( &pms );
#if defined(DEBUG_SECTIONS) && defined(DEBUG_MSGS)
fprintf( stdout, "\n" );
#endif
// try to found correct offset independent of architectures
DWORD offset = pIDH->e_lfanew + pINTH->FileHeader.SizeOfOptionalHeader + sizeof(IMAGE_NT_HEADERS) - sizeof(IMAGE_OPTIONAL_HEADER);
while ( idx < sections )
{
pISH = (PIMAGE_SECTION_HEADER)( ptr + offset + idx * sizeof(IMAGE_SECTION_HEADER) );
if ( (PBYTE)pISH + sizeof(IMAGE_SECTION_HEADER) > ptr + size )
{
res = RESULT_CORRUPTED;
break;
}
if ( pISH->PointerToRawData + pISH->SizeOfRawData > size )
{
res = RESULT_CORRUPTED;
break;
}
#if defined(DEBUG_SECTIONS) && defined(DEBUG_MSGS)
fprintf( stdout, "%s - %d - %d \n", pISH->Name, pISH->PointerToRawData, pISH->SizeOfRawData);
#endif
mir_md5_append( &pms, ptr + pISH->PointerToRawData, pISH->SizeOfRawData );
idx++;
}
if ( res == RESULT_OK )
mir_md5_finish( &pms, digest );
}
}
}
else
res = RESULT_READERROR;
if ( ptr )
UnmapViewOfFile( ptr );
if ( hMap )
CloseHandle( hMap );
CloseHandle( hFile );
return res;
}
int main( int argc, char** argv )
{
mir_md5_byte_t digest[16] = {0};
int res = 0;
if ( argc > 1 )
{
for ( int i=1; i < argc; i++ )
{
#ifdef DEBUG_MSGS
fprintf( stdout, "Processing '%s'... ", argv[ i ] );
#endif
res = PEChecksum( argv[ i ], digest);
switch(res)
{
#ifdef DEBUG_MSGS
case RESULT_NOTFOUND:
{
fprintf( stdout, "not found!\n");
break;
}
case RESULT_READERROR:
{
fprintf( stdout, "read error!\n");
break;
}
case RESULT_NOTPE:
{
fprintf( stdout, "not PE type!\n");
break;
}
case RESULT_CORRUPTED:
{
fprintf( stdout, "corrupted\n");
break;
}
#endif
case RESULT_OK:
{
int i;
for ( i = 0; i < sizeof(digest) / sizeof(digest[0]); i++ )
fprintf( stdout, "%02X", digest[i] );
} // no break
default:
{
fprintf( stdout, "\n");
break;
}
}
}
}
else
{
fprintf( stderr, "PE CHECKSUM TOOL v1.0\n\n" );
fprintf( stderr, "Usage: checksum.exe [filename] ... [filename]\n");
fprintf( stderr, "Output: MD5 checksum of all sections in PE file.\n");
return RESULT_NONE;
}
return res;
}
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