crypto++

erat123 · 01-20-2007, 11:38 PM

hi guys, I've been doing research all day long and havent really found anything yet. i'm building a web server and i need to use a hash algorithm for passwords. i would like to program this in c++. i've been looking at crypto++ and i would really like to use sha512. does anyone know where i can find a GOOD working example of this or another related algorithm in c++?

Matir · 01-21-2007, 12:07 AM

I would strongly suggest you just link with openssl and use its built-in hashing functions.

erat123 · 01-21-2007, 12:09 AM

could you give me an example of that please?

Matir · 01-21-2007, 12:24 AM

Well, for md5:

Code:

#include <openssl/md5.h>
#include <string.h>

char *md5sum(char *pw){
    static char strbuf[33];
    char buf[16];
    int i;

    strbuf[0] = '\0';
    MD5(pw,strlen(pw),buf);

    for(i=0;i<16;i++)
        sprintf(strbuf,"%s%02x",strbuf,buf[i]);

    return strbuf;
}

This will return the hex form of the MD5 hash as a static char *.

erat123 · 01-21-2007, 01:51 AM

Thanks for the sample code. I tried it out and changed it a little and I'm having some problems with it.

Code:

#include <stdio.h>
#include <openssl/md5.h>
#include <string.h>
#include <iostream>
using namespace std;

char *md5sum(char *pw){
    static char strbuf[33];
    char buf[16];
    int i;

    strbuf[0] = '\0';
    MD5((const unsigned char*)pw,strlen(pw),(unsigned char*)buf);

    for(i=0;i<16;i++)
        sprintf(strbuf,"%s%02x",strbuf,buf[i]);

    return strbuf;
}

int main()
{
	char *x = "test";
	md5sum(x);
	return 0;
}

It compiled fine, but it gives me a permission denied error. Do you see anything wrong with the code? Also, here is the line I used to compile:

Code:

eric@eric-desktop:~/Desktop$ g++ -w -pipe -c encrypt.cpp -o md5.exe
eric@eric-desktop:~/Desktop$ ./md5.exe
bash: ./md5.exe: Permission denied