Re: master 583995c: GnuTLS HMAC and symmetric cipher support

[Paul Eggert <eggert@cs.ucla.edu>]

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Glenn Morris wrote:
> I was using ftp://ftp.gnutls.org/gcrypt/gnutls/v3.2/gnutls-3.2.21.tar.xz

Weird, because I was looking at the same source code. It does not build under 
recent Ubuntu or Fedora, so I did not compile it: I just looked at the source 
code. Its implementation of gnutls_cipher_list appears to be straightforward: it 
adds only values found as the 'id' component of an entry in the 'algorithms' 
array in lib/algorithms/ciphers.c. None of these values are 
GNUTLS_CIPHER_UNKNOWN, so gnutls_cipher_list cannot possibly return an array 
containing GNUTLS_CIPHER_UNKNOWN.

For example, on my platform, if I compile and run the attached program via:

gcc gs.c -lgnutls
./a.out

the program silently succeeds. What happens on your platform?

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#include <gnutls/gnutls.h>
#include <stdio.h>

int
main (void)
{
  const gnutls_cipher_algorithm_t *gciphers = gnutls_cipher_list ();
  for (int pos = 0; gciphers[pos] != 0; pos++)
    {
      gnutls_cipher_algorithm_t gca = gciphers[pos];
      if (gca == GNUTLS_CIPHER_UNKNOWN)
	return printf ("gciphers[%d] == GNUTLS_CIPHER_UNKNOWN ?!?\n", pos), 1;
    }
  return 0;
}