/* LibTomPoly, Polynomial Basis Math -- Tom St Denis  *  * LibTomPoly is a public domain library that provides * polynomial basis arithmetic support.  It relies on * LibTomMath for large integer support. * * This library is free for all purposes without any * express guarantee that it works. * * Tom St Denis, tomstdenis@iahu.ca, http://poly.libtomcrypt.org */#include <tompoly.h>int pb_toraw(pb_poly *a, unsigned char *dst){   int err, x, y, z;   /* store the # of terms */   dst[0] = a->used & 255;   dst[1] = (a->used >> 8) & 255;   y      = 2;   /* store the characteristic */   z = mp_signed_bin_size(&(a->characteristic));   dst[y++] = z&255;   dst[y++] = (z>>8)&255;   if ((err = mp_to_signed_bin(&(a->characteristic), dst+y)) != MP_OKAY)          { return err; }   y += z;   for (x = 0; x < a->used; x++) {      z = mp_signed_bin_size(&(a->terms[x]));      dst[y++] = z&255;      dst[y++] = (z>>8)&255;      if ((err = mp_to_signed_bin(&(a->terms[x]), dst+y)) != MP_OKAY)             { return err; }      y += z;   }   return MP_OKAY;}