Question

I have a cross-language problem regarding md5 :).
I have this code in Java:

BASE64Encoder encoder = new BASE64Encoder();
MessageDigest md = MessageDigest.getInstance("MD5");
md.update(someString.getBytes());
byte[] bMac = md.digest();
String anotherString = encoder.encodeBuffer(bMac);

This encodes and hashes a string in md5 and base64. A string like “aaa&1” becomes Fv4eRn4R0/mB+uc4j1GGaA==

Now the problem is: how to do this in C++? I’m using openssl/md5.h, but like any other online md5 encoder (after a small google search), it gets a hash like:
16fe1e467e11d3f981fae7388f518668

Which is in hex it seems. If I try to transform the md5 hash in base64, I get a completely different hash (longer and uglier 🙂 ).

Help!!!

Thank you!

L.E.: I use the MD5 method from openssl/md5.h, as AZI pointed out.

Answer 1

Here is the C++ code to obtain md5

#include <openssl/md5.h>
unsigned char *MD5(const unsigned char *d, 
               unsigned long n,
               unsigned char *md);

example:

unsigned char inbuf[] = "aaa&1";
unsigned char outbuf[20];
MD5(inbuf, strlen(inbuf), outbuf);

for (i = 0; i < 20; i++) {
    printf("%02x ", outbuf[i]);
}

if Hex of 16fe1e467e11d3f981fae7388f518668 converted to Base64 then Hex to Base64 you will get Fv4eRn4R0/mB+uc4j1GGaA==

May refer to Howto base64 encode with C/C++ and OpenSSL to encode this to Base64