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Worked it out.

#include "opencv2/core/core.hpp"
#include "opencv2/imgproc/imgproc.hpp"
#include "opencv2/highgui/highgui.hpp"
#include <cstdio>
#include <iostream>
#include <string>
#include <cstring>
#include <functional>
#include <openssl/md5.h>

using namespace std;
using namespace cv;

static void help()
{
}

char *str2md5(const char *str, int length) {
    int n;
    MD5_CTX c;
    unsigned char digest[16];
    char *out = (char*)malloc(33);

    MD5_Init(&c);

    while (length > 0) {
        if (length > 512) {
            MD5_Update(&c, str, 512);
        } else {
            MD5_Update(&c, str, length);
        }
        length -= 512;
        str += 512;
    }

    MD5_Final(digest, &c);

    for (n = 0; n < 16; ++n) {
        snprintf(&(out[n*2]), 16*2, "%02x", (unsigned int)digest[n]);
    }

    return out;
}


int main(int argc, const char** argv)
{
    help();

    if (argc != 2)
    {
        return EXIT_FAILURE ;
    }

    string inputfile = argv[1] ;

    Mat src = imread (inputfile, -1) ;

    if (src.empty())
    {
        return EXIT_FAILURE ;
    }



    cout << str2md5((char*)src.data, (int)src.step[0] * src.rows) << " " << inputfile << endl ;




    return 0;
}