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An Analysis of the Windows PE Checksum Algorithm

, 7 Mar 2008
An Analysis Demonstrating the PE Checksum is an Additive Checksum based on RFC 1071
crc32.zip
crc32source.zip
CRC32
CRC32
CRC32.suo
notepadaltered.zip
notepadoriginal.zip
pechecksum.zip
pechecksumsource.zip
PE Checksum
PEChecksum
res
Sample.ico
PEChecksum.suo
Sample.suo
// CRC32.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"
#include "crc.h"
#include "hex.h"

void Usage( void );

int _tmain(int argc, _TCHAR* argv[])
{
    if( argc != 2 )
    {
        Usage();
        return -1;
    }

    HANDLE hFile = INVALID_HANDLE_VALUE;
    HANDLE hFileMapping = NULL;
    PVOID pBaseAddress = NULL;
    DWORD dwFileLength = 0;

    try
    {
        /////////////////////////////////////////////////////////////
        hFile = CreateFile( argv[ 1 ], GENERIC_READ, FILE_SHARE_READ,
            NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, 0 );
        if ( INVALID_HANDLE_VALUE == hFile ||
            NULL == hFile) { throw GetLastError(); }

        /////////////////////////////////////////////////////////////
        hFileMapping = CreateFileMapping(hFile, NULL,
            PAGE_READONLY, 0, 0, NULL);
        if ( NULL == hFileMapping )
        {
            throw GetLastError();
        }

        /////////////////////////////////////////////////////////////
        pBaseAddress = MapViewOfFile( hFileMapping,
            FILE_MAP_READ, 0, 0, 0);
        if ( NULL == pBaseAddress )
        {
            throw GetLastError();
        }

        /////////////////////////////////////////////////////////////
        DWORD dwSize = 0;
        LARGE_INTEGER liSize = { 0, 0 };
        if( TRUE == GetFileSizeEx( hFile, &liSize ) )
        {
            dwSize = liSize.LowPart;
        }

        CryptoPP::CRC32 crc;
        byte digest[ CryptoPP::CRC32::DIGESTSIZE ] = { 0 };
        crc.CalculateDigest( digest, (byte*)pBaseAddress, dwSize );
        
        std::string sink;
        CryptoPP::HexEncoder encoder( new CryptoPP::StringSink( sink ), true );
        encoder.Put( digest, CryptoPP::CRC32::DIGESTSIZE );
        encoder.MessageEnd();

        std::cout << sink << std::endl;

    }
    catch(...)
    {
        std::wcerr << "Error computing CRC-32" << std::endl;
    }

    UnmapViewOfFile( hFileMapping );
    CloseHandle( hFile );

    return 0;
}

void Usage( void )
{
    std::tcout << _T("crc32.exe <filename>") << std::endl;
    std::tcout << _T(" filename to have CRC-32 computed.") << std::endl;
}

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License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

About the Author

Jeffrey Walton
Systems / Hardware Administrator
United States United States
No Biography provided

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