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- #include "poly.h"
-
-
- void PQCLEAN_NTRUHPS4096821_CLEAN_poly_Sq_tobytes(unsigned char *r, const poly *a) {
- int i;
-
- for (i = 0; i < NTRU_PACK_DEG / 2; i++) {
- r[3 * i + 0] = (unsigned char) ( a->coeffs[2 * i + 0] & 0xff);
- r[3 * i + 1] = (unsigned char) ((a->coeffs[2 * i + 0] >> 8) | ((a->coeffs[2 * i + 1] & 0x0f) << 4));
- r[3 * i + 2] = (unsigned char) ((a->coeffs[2 * i + 1] >> 4));
- }
- }
-
- void PQCLEAN_NTRUHPS4096821_CLEAN_poly_Sq_frombytes(poly *r, const unsigned char *a) {
- int i;
- for (i = 0; i < NTRU_PACK_DEG / 2; i++) {
- r->coeffs[2 * i + 0] = (a[3 * i + 0] >> 0) | (((uint16_t)a[3 * i + 1] & 0x0f) << 8);
- r->coeffs[2 * i + 1] = (a[3 * i + 1] >> 4) | (((uint16_t)a[3 * i + 2] & 0xff) << 4);
- }
- }
-
- void PQCLEAN_NTRUHPS4096821_CLEAN_poly_Rq_sum_zero_tobytes(unsigned char *r, const poly *a) {
- PQCLEAN_NTRUHPS4096821_CLEAN_poly_Sq_tobytes(r, a);
- }
-
- void PQCLEAN_NTRUHPS4096821_CLEAN_poly_Rq_sum_zero_frombytes(poly *r, const unsigned char *a) {
- int i;
- PQCLEAN_NTRUHPS4096821_CLEAN_poly_Sq_frombytes(r, a);
-
- /* Set r[n-1] so that the sum of coefficients is zero mod q */
- r->coeffs[NTRU_N - 1] = 0;
- for (i = 0; i < NTRU_PACK_DEG; i++) {
- r->coeffs[NTRU_N - 1] += r->coeffs[i];
- }
- r->coeffs[NTRU_N - 1] = MODQ(-(r->coeffs[NTRU_N - 1]));
- }
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