`ptogf2n'
---------

ptogf2n(POLY)
     :: Converts a univariate polynomial into an element of GF(2^N).

RETURN
     element of GF(2^N)

POLY
     univariate polynomial

   * Generates an element of GF(2^N) represented by POLY.  The
     coefficients are reduced modulo 2.  The output is equal to the
     result by substituting `@' for the variable of POLY.

     [1] setmod_ff(x^30+x+1);
     x^30+x+1
     [2] ptogf2n(x^100);
     (@^100)

References
     *Note `gf2ntop': gf2ntop

