`ntogf2n'
---------

ntogf2n(M)
     :: $B<+A3?t$r(B GF(2^n) $B$N85$KJQ49(B

RETURN
     GF(2^n) $B$N85(B

M
     $BHsIi@0?t(B

   * $B<+A3?t(B M $B$N(B 2 $B?JI=8=(B M=M0+M1*2+...+MK*2^k $B$KBP$7(B,
     GF(2^n)=GF(2)[t]/(g(t)) $B$N85(B M0+M1*t+...+MK*t^k mod g(t) $B$rJV$9(B.

   * $BDj5AB?9`<0$K$h$k>jM>$O<+F0E*$K$O7W;;$5$l$J$$$?$a(B, `simp_ff()' $B$r(B
     $BE,MQ$9$kI,MW$,$"$k(B.

     [1] setmod_ff(x^30+x+1);
     x^30+x+1
     [2] N=ntogf2n(2^100);
     (@^100)
     [3] simp_ff(N);
     (@^13+@^12+@^11+@^10)

$B;2>H(B
     *Note `gf2nton': gf2nton

