Calculate MD5 Hash of File (or SHA-1, and other hash algorithms)

Demonstrates how to calculate a hash for a file's contents.

Downloads:

MS Windows Visual C/C++ Libraries

Linux/CentOS C/C++ Libraries

MAC OS X C/C++ Libraries

Solaris C/C++ Libraries

C++ Builder Libraries

FreeBSD C++ Libraries

HP-UX C++ Libraries

BlackBerry QNX C++ Libraries

// Needs #include <CkCrypt2.h>

    CkString strOut;

    CkCrypt2 crypt;

    bool success;
    success = crypt.UnlockComponent("Anything for 30-day trial");
    if (success != true) {
        strOut.append(crypt.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    //  Set the name of the hash algorithm.
    //  Other choices include "sha1", "sha384", "sha512", "md2", "md5", and "haval".
    crypt.put_HashAlgorithm("md5");

    //  EncodingMode specifies the encoding of the hash output.
    //  It may be "hex", "url", "base64", or "quoted-printable".
    crypt.put_EncodingMode("hex");

    //  Files of any type may be hashed -- it doesn't matter
    //  if the file is binary or text...
    const char * hashStr;
    hashStr = crypt.hashFileENC("/temp/something.dat");
    if (hashStr == 0 ) {
        strOut.append(crypt.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    strOut.append(hashStr);
    strOut.append("\r\n");

    SetDlgItemText(IDC_EDIT1,strOut.getUnicode());