mirror of
https://github.com/henrydcase/pqc.git
synced 2024-11-23 07:59:01 +00:00
0d7743d576
* Update NTRU version: https://github.com/jschanck/ntru/tree/485dde03 * Fixed ntruhrss701/clean/Makefile.Microsoft_nmake
68 lines
2.1 KiB
C
68 lines
2.1 KiB
C
#include "poly.h"
|
|
|
|
/* Map {0, 1, 2} -> {0,1,q-1} in place */
|
|
void PQCLEAN_NTRUHPS4096821_CLEAN_poly_Z3_to_Zq(poly *r) {
|
|
int i;
|
|
for (i = 0; i < NTRU_N; i++) {
|
|
r->coeffs[i] = r->coeffs[i] | ((-(r->coeffs[i] >> 1)) & (NTRU_Q - 1));
|
|
}
|
|
}
|
|
|
|
/* Map {0, 1, q-1} -> {0,1,2} in place */
|
|
void PQCLEAN_NTRUHPS4096821_CLEAN_poly_trinary_Zq_to_Z3(poly *r) {
|
|
int i;
|
|
for (i = 0; i < NTRU_N; i++) {
|
|
r->coeffs[i] = MODQ(r->coeffs[i]);
|
|
r->coeffs[i] = 3 & (r->coeffs[i] ^ (r->coeffs[i] >> (NTRU_LOGQ - 1)));
|
|
}
|
|
}
|
|
|
|
void PQCLEAN_NTRUHPS4096821_CLEAN_poly_Sq_mul(poly *r, const poly *a, const poly *b) {
|
|
PQCLEAN_NTRUHPS4096821_CLEAN_poly_Rq_mul(r, a, b);
|
|
PQCLEAN_NTRUHPS4096821_CLEAN_poly_mod_q_Phi_n(r);
|
|
}
|
|
|
|
void PQCLEAN_NTRUHPS4096821_CLEAN_poly_S3_mul(poly *r, const poly *a, const poly *b) {
|
|
PQCLEAN_NTRUHPS4096821_CLEAN_poly_Rq_mul(r, a, b);
|
|
PQCLEAN_NTRUHPS4096821_CLEAN_poly_mod_3_Phi_n(r);
|
|
}
|
|
|
|
static void PQCLEAN_NTRUHPS4096821_CLEAN_poly_R2_inv_to_Rq_inv(poly *r, const poly *ai, const poly *a) {
|
|
|
|
int i;
|
|
poly b, c;
|
|
poly s;
|
|
|
|
// for 0..4
|
|
// ai = ai * (2 - a*ai) mod q
|
|
for (i = 0; i < NTRU_N; i++) {
|
|
b.coeffs[i] = -(a->coeffs[i]);
|
|
}
|
|
|
|
for (i = 0; i < NTRU_N; i++) {
|
|
r->coeffs[i] = ai->coeffs[i];
|
|
}
|
|
|
|
PQCLEAN_NTRUHPS4096821_CLEAN_poly_Rq_mul(&c, r, &b);
|
|
c.coeffs[0] += 2; // c = 2 - a*ai
|
|
PQCLEAN_NTRUHPS4096821_CLEAN_poly_Rq_mul(&s, &c, r); // s = ai*c
|
|
|
|
PQCLEAN_NTRUHPS4096821_CLEAN_poly_Rq_mul(&c, &s, &b);
|
|
c.coeffs[0] += 2; // c = 2 - a*s
|
|
PQCLEAN_NTRUHPS4096821_CLEAN_poly_Rq_mul(r, &c, &s); // r = s*c
|
|
|
|
PQCLEAN_NTRUHPS4096821_CLEAN_poly_Rq_mul(&c, r, &b);
|
|
c.coeffs[0] += 2; // c = 2 - a*r
|
|
PQCLEAN_NTRUHPS4096821_CLEAN_poly_Rq_mul(&s, &c, r); // s = r*c
|
|
|
|
PQCLEAN_NTRUHPS4096821_CLEAN_poly_Rq_mul(&c, &s, &b);
|
|
c.coeffs[0] += 2; // c = 2 - a*s
|
|
PQCLEAN_NTRUHPS4096821_CLEAN_poly_Rq_mul(r, &c, &s); // r = s*c
|
|
}
|
|
|
|
void PQCLEAN_NTRUHPS4096821_CLEAN_poly_Rq_inv(poly *r, const poly *a) {
|
|
poly ai2;
|
|
PQCLEAN_NTRUHPS4096821_CLEAN_poly_R2_inv(&ai2, a);
|
|
PQCLEAN_NTRUHPS4096821_CLEAN_poly_R2_inv_to_Rq_inv(r, &ai2, a);
|
|
}
|