C++

Forum

 
problem with gmp in dev-c++

hypercube1 (66)
after reading about the rsa cipher i wanted to make my own version.
it uses the gmp library, i think the code is all correct (except the chartonum, it enciphers each letter seperately making it a simple monalphebetic but will change later)

the problem is a bunch of linker errors if you have used gmp on dev you may have a solution. i've seen this sort of thing when using statics and constants.


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
 
#include <iostream>
#include <math.h>
#include <cctype>
#include <string.h>
#include <stdio.h>
#include <gmp.h>

using namespace std;

int chartonum(char letter)
{
       int result;
       result = (int)letter;
       return result;
}

int main()
{
    mpz_t key, e, ciphertext[30], value, value2, prime1, prime2;
    mpz_init(key);
    mpz_init_set_ui(e,19);
    mpz_array_init(ciphertext[0],30,512);
    mpz_init(value);
    mpz_init(value2);
    mpz_init_set_ui(prime1,7151);
    mpz_init_set_ui(prime2,8293);
    mpz_mul(key, prime1, prime2);
    string plaintext;
    bool run=true;
    cout.precision(20);
    while(run){
    cin >> plaintext;
    for(int i=0;i<plaintext.length();i++)
    {
           mpz_set_ui(value, chartonum(plaintext[i]));
           mpz_powm(ciphertext[i], e, value, key);
           cout << ciphertext[i] << endl;
    }
}
    return 0;
}



errors
C:\DOCUME~1\***\LOCALS~1\Temp\ccwdcaaa.o(.text+0x197) In function `main':
[Linker error] undefined reference to `__gmpz_init'
[Linker error] undefined reference to `__gmpz_init_set_ui'
[Linker error] undefined reference to `__gmpz_array_init'
[Linker error] undefined reference to `__gmpz_init'
and so on with similar ones...


any help would be apreciated
Athar (4466)
Linking gmp might help.
hypercube1 (66)
the includes, libraries, and binaries are all linked
yoyowinwin (5)
Hello, hypercube1.

pay attention to Line 37:
cout << ciphertext[i] << endl;
so,you need to add an include "gmpxx.h", and link gmp with -lgmp -lgmpxx

or change this line like this :

gmp_printf("%Zd\n",ciphertext[i]);


cheers
hypercube1 (66)
much thanks about the output, however it is linked to those libs, or atleast dev says it is. is there a way to link with specific libs from a preprocessor standpoint? or is there another step to linking in dev other than adding the libs to the directories from compiler options?
hypercube1 (66)
Nevermind, i figured it out, i didn't realize that you have to put it into project format and use the project options to link specific libs. if anyone knows a way around that it would be appreciated, i'd rather use individual .cpp files than the pesky .devs
Zhuge (4664)
Most IDEs (the ones I've seen) determine which cpps to link together to a single executable by grouping them in a project.
hypercube1 (66)
i just haven't used many other libs or done anything with a whole lot of cpps
Athar (4466)
Should've said so in my first post, but first thing you should do is to ditch Dev-C++ (and make sure the bundled MinGW is fully deleted as well) and install Code::Blocks instead.
Topic archived. No new replies allowed.