Help with "config.h file not found error" on Gnupg version 1.4.13

[Francis Kp]

First of all, thank you for taking your time to reply to this email. I
tried it using the -l flag. The config file was found in the directory
before that. Below is the command I executed.

$ gcc -I /home/user/Desktop/gnupg-1.4.13
-l/home/user/Desktop/gnupg-1.4.13 mpi-pow.c

Now it's throwing the below error

>In file included from mpi-pow.c:32:
>mpi-internal.h:32:10: fatal error: mpi.h: No such file or directory
>   32 | #include "mpi.h"
>      |          ^~~~~~~
>compilation terminated.

I tried copying the header file mpi.h into the directory gnupg-1.4.13
and compiling the mpi-pow.c program, now the error is like given
below:

>In file included from mpi-internal.h:32,
>                 from mpi-pow.c:32:
>mpi.h:34:10: fatal error: iobuf.h: No such file or directory
>   34 | #include "iobuf.h"
>      |          ^~~~~~~~~

Is there anything wrong with the way I used the -l flag ? If so could
anyone guide me in the right direction?

On Wed, 30 Mar 2022 at 21:19, Robert J. Hansen via Gnupg-users
<gnupg-users at gnupg.org> wrote:
>
> You will have much better luck if you send only plain-text emails to
> this list.  Some of the people you'd really like to see your email
> refuse to read HTML email, on the grounds that it's a security risk.
> I've quoted your entire message below as plaintext to help you reach
> these people.
>
> To resolve your problem I'd suggest finding where the Automake-created
> config.h header file lies, and including that directory in your GCC
> invocation by using the -I flag.
>
> Hope this helps.  :)
>
> On 3/30/2022 1:21 AM, Francis Kp via Gnupg-users wrote:
> > Hi all,
> > As in exercise in understanding Cybersecurity in IoT better, I'm trying
> > to implement the flush-reload attack from the paper "FLUSH+RELOAD: A
> > High Resolution, Low Noise, L3 Cache Side-Channel Attack". The crux of
> > the attack is to extract the private key of RSA encryption used in
> > Gnupg. One of the steps to initiate the attack is to find certain memory
> > addresses to feed to a spy function. For that I'm trying to open a C
> > executable in Gnu debugger(gdb). The program is part of the Gnupg 1.4.13
> > version. My aim is to get the memory address of a particular function by
> > setting breakpoint at that line. While compiling the c program using
> > **gcc -g mpi-pow.c**, (And yes I tried without the -g option) I'm
> > getting this error:
> >
> >
> >
> > *mpi-pow.c:28:10: fatal error: config.h: No such file or directory
> >         28 | #include <config.h>
> >            |          ^~~~~~~~~~
> >      compilation terminated*
> >
> >
> >
> > These were the exact steps I did:-->
> >
> >  1.   - Extracted the Gnupg source code using tar xjvf gnupg-1.4.13.tar.bz2
> >  2.   - cd gnupg-1.4.13/
> >  3.   - ./configure
> >  4.   - sudo make
> >  5.   - sudo make install
> >
> >
> > The source code of Gnupg 1.4.13 is at Link_to_code
> > <http://www.ring.gr.jp/pub/net/gnupg/gnupg/>
> > The original paper is here Link_to_paper
> > <https://eprint.iacr.org/2013/448.pdf>
> >
> > A quick google search told me that "In computing, configuration files
> > (commonly known simply as config files) are files used to configure the
> > parameters and initial settings for some computer programs". /And as far
> > as I understood, the config file is made when the "./configure" command
> > is run and in this case, it simply means there is no config.h file in
> > the current directory/. There were no errors during the compilation of
> > Gnupg.
> >
> > I'm using the Intel(R) Core(TM) i5-8250U CPU @ 1.60GHz processor.
> > I tried it on WSL and on Ubuntu 20.04 installed on dual boot.
> >
> >   1. What might be the reason ?
> >   2. How can I rectify this error ?
> >
> > Any help would be highly appreciated.
> >
> > _______________________________________________
> > Gnupg-users mailing list
> > Gnupg-users at gnupg.org
> > https://lists.gnupg.org/mailman/listinfo/gnupg-users
>
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