pqc/crypto_kem/ntruhrss701/clean/poly_rq_mul.c

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#include "poly.h"
void PQCLEAN_NTRUHRSS701_CLEAN_poly_Rq_mul(poly *r, const poly *a, const poly *b) {
int k, i;
for (k = 0; k < NTRU_N; k++) {
r->coeffs[k] = 0;
for (i = 1; i < NTRU_N - k; i++) {
r->coeffs[k] += a->coeffs[k + i] * b->coeffs[NTRU_N - i];
}
for (i = 0; i < k + 1; i++) {
r->coeffs[k] += a->coeffs[k - i] * b->coeffs[i];
}
}
}