Click here to Skip to main content
Click here to Skip to main content

MD5 File Creation and Verification

, 3 Jan 2009 CPOL
Rate this:
Please Sign up or sign in to vote.
A tool for creating/verifying MD5 files


In cryptography, MD5 (Message-Digest algorithm 5) is a widely used, partially insecure cryptographic hash function with a 128-bit hash value. As an Internet standard (RFC 1321), MD5 has been employed in a wide variety of security applications, and is also commonly used to check the integrity of files. An MD5 hash is typically expressed as a 32 digit hexadecimal number.

For more information regarding MD5, click here.


This tool is for calculating/verifying MD5 value of an EXE or multiple EXEs in a folder and its sub folders.

Using the Code

The basic function in this tool is as follows. This function will accept the EXE "FileName" and will return the MD5 value in "MD5". Anyone can use this function in his/her code to get the MD5 value. Just copy and paste this function in your code. You should include the header <wincrypt.h>.

int CalculateMD5(CString FileName, CString &MD5)
    const size_t StringSize = FileName.GetLength() + 1;
    size_t CharactersConverted = 0;

    char *file = new char[StringSize];
    //char file[1024];
    wcstombs_s(&CharactersConverted, file, 
               FileName.GetLength()+1, FileName, _TRUNCATE);

    int i, j;
    FILE *fInput;
    MD5Context md5Hash;
    unsigned char bBuffer[4096];
    unsigned char b;
    char c;
        MessageBoxW(0, L"Could not start crypto library", 
                    L"MD5", MB_ICONERROR);
        return 0;
    fInput = fopen(file, "rb");
       MessageBoxW(0, L"Failed to open - Invalid File", 
                   L"MD5", MB_ICONERROR);
        return 0;
    memset(&md5Hash, 0, sizeof(MD5Context));
        unsigned int nCount = fread(bBuffer, sizeof(unsigned char), 
                                    4096, fInput);
        MD5Update(&md5Hash, bBuffer, nCount);
    //printf("\nChecksum of '%s' is: ", argv[1]);
    char *Value = new char[1024];int k = 0;
    for(i = 0; i < 16; i++)
        b = md5Hash.digest[i];
        for(j = 4; j >= 0; j -= 4)
            c = ((char)(b >> j) & 0x0F);
            if(c < 10) c += '0';
            else c = ('a' + (c - 10));
            //printf("%c", c);
			Value[k] = c;
    Value[k] = '\0';
    //CString cString;
    MD5 = CString(Value);
    delete file;
    delete Value;
    return 1;


  • 3rd January, 2009: Initial post


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


About the Author

Shaheer Abdulrahiman
Software Developer
India India
No Biography provided

Comments and Discussions

GeneralMD5 Source in C++ Pinmembernone28-Feb-09 5:54 
GeneralMD5 is obsolete Pinmemberwim ton6-Jan-09 0:09 
GeneralRe: MD5 is obsolete PinmemberTobiasP6-Jan-09 9:44 
GeneralMy vote of 2 Pinmemberzengkun1005-Jan-09 17:58 
General牛B PinmemberMember 45990724-Jan-09 5:16 
GeneralRe: 牛B Pinmemberbaijun19824-Jan-09 20:01 
GeneralRe: 牛B PinmemberEnjon CHEN6-Apr-10 0:48 
GeneralRe: 牛B Pinmemberhaohui27-Oct-10 6:24 

General General    News News    Suggestion Suggestion    Question Question    Bug Bug    Answer Answer    Joke Joke    Rant Rant    Admin Admin   

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.

| Advertise | Privacy | Terms of Use | Mobile
Web02 | 2.8.150331.1 | Last Updated 3 Jan 2009
Article Copyright 2009 by Shaheer Abdulrahiman
Everything else Copyright © CodeProject, 1999-2015
Layout: fixed | fluid