[ekinox777Member]

Using this library I get an output speed of ~406kbs, while using /dev/random (enabling truerng through rng-tool) I get only ~80kbs. (without truerng the speed of /dev/random is very low, ~3-4 bytes/s).
Why there is such a big diference? Why does entropy pool not use all available output of TrueRNG?

[ekinox777Member]

Thank you for your help!
The linking is working now without errors.

Regarding libudev:
I built the library without libudev or libusb.
When I try to build the library WITH libudev “make all” works w/o errors but “make check” fails.
when running the binary file I get this error:

mihai@bhairava:~/Soft/TrueRNG/truerng-2.0$ src.bin/truerng --list

Searching...
lt-truerng: truerng_open.c:196: truerng_libudev: Assertion 'Serial_found != NULL' failed.
Aborted (core dumped)

Built without libudev or libusb I get no errors, but it is unable to detect ids and serial:

mihai@bhairava:~/Soft/TrueRNG/truerng-2.0$ src.bin/truerng --list

Searching...
file path : /dev/TrueRNG
idVendor  : <unknown>
idProduct : <unknown>
Product   : <unknown>
Serial    : <unknown>

Configuring...
state     : ON
mode      : NORMAL  300 baud

Perhaps it is because I use a TrueRNG v3(?)

Anyway, I can use now the library. , which seems to give a higher bitrate than using /dev/random (via rng-tools).

gratefully yours,
Mihai

[ekinox777Member]

Hello!
Thank you for your work. I’m trying to test your library but without succes. I know some c++ but lack skills in compiling and linking. I couldn’t successfully build a simple program dynamically or statically linking.
I’m trying with gcc, under Ubuntu.
Here is the code main.cpp:

#include <cstdlib>
#include "truerng.h"
#include <iostream>

using namespace std;

/*
 * 
 */
int main(int argc, char** argv) {
    unsigned int nb_bytes =10;
    unsigned char buf[(nb_bytes)];
    int rc;
    //rc = truerng(buf, sizeof(buf));
    rc = truerng_bytes(TRUERNG_PATH_DEFAULT, TRUERNG_ID_ANY, TRUERNG_ID_ANY, TRUERNG_SERIAL_ANY, buf, sizeof(buf));
   for (int i=0;i<nb_bytes;i++) cout << buf[i];
    return 0;
}

Trying to link statically I get:

g++ -Wl,-static libtruerng.a main.o -o trng 
/usr/bin/ld: cannot find -lgcc_s
/usr/bin/ld: cannot find -lgcc_s
collect2: error: ld returned 1 exit status

Trying to link dynamically I get:

g++  -ltruerng main.cpp -o trng 
main.cpp: In function ‘int main(int, char**)’:
main.cpp:28:114: warning: deprecated conversion from string constant to ‘char*’ [-Wwrite-strings]
    rc = truerng_bytes(TRUERNG_PATH_DEFAULT, TRUERNG_ID_ANY, TRUERNG_ID_ANY, TRUERNG_SERIAL_ANY, buf, sizeof(buf));
                                                                                                                 ^
/tmp/ccRtZRGs.o: In function 
'main':
main.cpp:(.text+0xaf): undefined reference to 'truerng_bytes(char*, unsigned short, unsigned short, char*, unsigned char*, unsigned long)'
collect2: error: ld returned 1 exit status

All the files (truerng.h, main.cpp, libtruerng.a, libtruerng.so, libtruerng.so.2.0.0) are in the same folder.

I tried to understand the compiling and linking of the binary pgm “truerng” but it seems too complicated for my skills. Is there a simple way to compile and link my example, without using makefile and libtool?

cheers,
Mihai

• This reply was modified 7 years, 2 months ago by  ekinox777.
• This reply was modified 7 years, 2 months ago by  ekinox777.
• This reply was modified 7 years, 2 months ago by  ekinox777.

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