BSWAP
#ifdef BSWAP
bitlen = BSWAP(bitlen);
#ifdef BSWAP
pmac->u[0] = BSWAP(pmac->u[0]);
pmac->u[1] = BSWAP(pmac->u[1]);
pmac->u[2] = BSWAP(pmac->u[2]);
pmac->u[3] = BSWAP(pmac->u[3]);
pmac->u[4] = BSWAP(pmac->u[4]);
case 2 : swapf = ( pf->swap_bytes ? 0 : BSWAP );
swapf = pf->swap_shorts ? BSWAP : (BSWAP | WSWAP);