gfmul
gfmul(Y, H, &Y);
gfmul(Y, H, &Y);
gfmul(Y, H, &Y);
gfmul(H,H,&H2);
gfmul(H,H2,&H3);
gfmul(H,H3,&H4);
gfmul(X, H, &X);
gfmul(X,H,&X);
gfmul(X,H,&X);
gfmul(X, H, &X);
gfmul(X,H,&X);
gfmul(Y, H, &Y);
gfmul(Y, H, &Y);
gfmul(Y, H, &Y);
gfmul(H,H,&H2);
gfmul(H,H2,&H3);
gfmul(H,H3,&H4);
gfmul(X, H, &X);
gfmul(X,H,&X);
gfmul(X,H,&X);
gfmul(X, H, &X);
gfmul(X,H,&X);