`extdeg_ff'
-----------

extdeg_ff()
     :: Extension degree of the current base field over the prime field.

RETURN
     integer

   * Returns the extension degree of the current base field over the
     prime field.

   * 1 is returned if GF(P), where P is a prime, is set.  N is returned
     if GF(2^N) is set.

     [0] extdeg_ff();
     extdeg_ff : current_ff is not set
     return to toplevel
     [0] setmod_ff(3);
     3
     [1] extdeg_ff();
     1
     [2] setmod_ff(x^2+x+1);
     x^2+x+1
     [3] extdeg_ff();
     2

References
     *Note `setmod_ff': setmod_ff

