182 lines
6.9 KiB
C
182 lines
6.9 KiB
C
#include "params.h"
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#include "poly.h"
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#include "polyvec.h"
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#include <stdint.h>
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/*************************************************
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* Name: PQCLEAN_KYBER512_CLEAN_polyvec_compress
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*
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* Description: Compress and serialize vector of polynomials
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*
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* Arguments: - uint8_t *r: pointer to output byte array
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* (needs space for KYBER_POLYVECCOMPRESSEDBYTES)
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* - const polyvec *a: pointer to input vector of polynomials
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**************************************************/
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void PQCLEAN_KYBER512_CLEAN_polyvec_compress(uint8_t r[KYBER_POLYVECCOMPRESSEDBYTES], const polyvec *a) {
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unsigned int i, j, k;
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uint16_t t[4];
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for (i = 0; i < KYBER_K; i++) {
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for (j = 0; j < KYBER_N / 4; j++) {
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for (k = 0; k < 4; k++) {
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t[k] = a->vec[i].coeffs[4 * j + k];
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t[k] += ((int16_t)t[k] >> 15) & KYBER_Q;
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t[k] = ((((uint32_t)t[k] << 10) + KYBER_Q / 2) / KYBER_Q) & 0x3ff;
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}
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r[0] = (uint8_t)(t[0] >> 0);
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r[1] = (uint8_t)((t[0] >> 8) | (t[1] << 2));
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r[2] = (uint8_t)((t[1] >> 6) | (t[2] << 4));
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r[3] = (uint8_t)((t[2] >> 4) | (t[3] << 6));
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r[4] = (uint8_t)(t[3] >> 2);
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r += 5;
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}
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}
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}
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/*************************************************
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* Name: PQCLEAN_KYBER512_CLEAN_polyvec_decompress
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*
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* Description: De-serialize and decompress vector of polynomials;
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* approximate inverse of PQCLEAN_KYBER512_CLEAN_polyvec_compress
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*
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* Arguments: - polyvec *r: pointer to output vector of polynomials
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* - const uint8_t *a: pointer to input byte array
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* (of length KYBER_POLYVECCOMPRESSEDBYTES)
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**************************************************/
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void PQCLEAN_KYBER512_CLEAN_polyvec_decompress(polyvec *r, const uint8_t a[KYBER_POLYVECCOMPRESSEDBYTES]) {
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unsigned int i, j, k;
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uint16_t t[4];
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for (i = 0; i < KYBER_K; i++) {
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for (j = 0; j < KYBER_N / 4; j++) {
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t[0] = (a[0] >> 0) | ((uint16_t)a[1] << 8);
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t[1] = (a[1] >> 2) | ((uint16_t)a[2] << 6);
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t[2] = (a[2] >> 4) | ((uint16_t)a[3] << 4);
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t[3] = (a[3] >> 6) | ((uint16_t)a[4] << 2);
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a += 5;
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for (k = 0; k < 4; k++) {
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r->vec[i].coeffs[4 * j + k] = ((uint32_t)(t[k] & 0x3FF) * KYBER_Q + 512) >> 10;
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}
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}
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}
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}
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/*************************************************
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* Name: PQCLEAN_KYBER512_CLEAN_polyvec_tobytes
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*
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* Description: Serialize vector of polynomials
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*
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* Arguments: - uint8_t *r: pointer to output byte array
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* (needs space for KYBER_POLYVECBYTES)
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* - const polyvec *a: pointer to input vector of polynomials
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**************************************************/
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void PQCLEAN_KYBER512_CLEAN_polyvec_tobytes(uint8_t r[KYBER_POLYVECBYTES], const polyvec *a) {
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unsigned int i;
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for (i = 0; i < KYBER_K; i++) {
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PQCLEAN_KYBER512_CLEAN_poly_tobytes(r + i * KYBER_POLYBYTES, &a->vec[i]);
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}
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}
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/*************************************************
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* Name: PQCLEAN_KYBER512_CLEAN_polyvec_frombytes
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*
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* Description: De-serialize vector of polynomials;
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* inverse of PQCLEAN_KYBER512_CLEAN_polyvec_tobytes
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*
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* Arguments: - uint8_t *r: pointer to output byte array
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* - const polyvec *a: pointer to input vector of polynomials
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* (of length KYBER_POLYVECBYTES)
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**************************************************/
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void PQCLEAN_KYBER512_CLEAN_polyvec_frombytes(polyvec *r, const uint8_t a[KYBER_POLYVECBYTES]) {
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unsigned int i;
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for (i = 0; i < KYBER_K; i++) {
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PQCLEAN_KYBER512_CLEAN_poly_frombytes(&r->vec[i], a + i * KYBER_POLYBYTES);
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}
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}
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/*************************************************
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* Name: PQCLEAN_KYBER512_CLEAN_polyvec_ntt
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*
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* Description: Apply forward NTT to all elements of a vector of polynomials
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*
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* Arguments: - polyvec *r: pointer to in/output vector of polynomials
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**************************************************/
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void PQCLEAN_KYBER512_CLEAN_polyvec_ntt(polyvec *r) {
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unsigned int i;
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for (i = 0; i < KYBER_K; i++) {
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PQCLEAN_KYBER512_CLEAN_poly_ntt(&r->vec[i]);
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}
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}
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/*************************************************
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* Name: PQCLEAN_KYBER512_CLEAN_polyvec_invntt_tomont
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*
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* Description: Apply inverse NTT to all elements of a vector of polynomials
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* and multiply by Montgomery factor 2^16
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*
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* Arguments: - polyvec *r: pointer to in/output vector of polynomials
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**************************************************/
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void PQCLEAN_KYBER512_CLEAN_polyvec_invntt_tomont(polyvec *r) {
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unsigned int i;
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for (i = 0; i < KYBER_K; i++) {
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PQCLEAN_KYBER512_CLEAN_poly_invntt_tomont(&r->vec[i]);
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}
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}
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/*************************************************
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* Name: PQCLEAN_KYBER512_CLEAN_polyvec_basemul_acc_montgomery
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*
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* Description: Multiply elements of a and b in NTT domain, accumulate into r,
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* and multiply by 2^-16.
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*
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* Arguments: - poly *r: pointer to output polynomial
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* - const polyvec *a: pointer to first input vector of polynomials
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* - const polyvec *b: pointer to second input vector of polynomials
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**************************************************/
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void PQCLEAN_KYBER512_CLEAN_polyvec_basemul_acc_montgomery(poly *r, const polyvec *a, const polyvec *b) {
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unsigned int i;
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poly t;
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PQCLEAN_KYBER512_CLEAN_poly_basemul_montgomery(r, &a->vec[0], &b->vec[0]);
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for (i = 1; i < KYBER_K; i++) {
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PQCLEAN_KYBER512_CLEAN_poly_basemul_montgomery(&t, &a->vec[i], &b->vec[i]);
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PQCLEAN_KYBER512_CLEAN_poly_add(r, r, &t);
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}
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PQCLEAN_KYBER512_CLEAN_poly_reduce(r);
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}
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/*************************************************
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* Name: PQCLEAN_KYBER512_CLEAN_polyvec_reduce
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*
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* Description: Applies Barrett reduction to each coefficient
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* of each element of a vector of polynomials;
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* for details of the Barrett reduction see comments in reduce.c
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*
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* Arguments: - polyvec *r: pointer to input/output polynomial
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**************************************************/
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void PQCLEAN_KYBER512_CLEAN_polyvec_reduce(polyvec *r) {
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unsigned int i;
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for (i = 0; i < KYBER_K; i++) {
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PQCLEAN_KYBER512_CLEAN_poly_reduce(&r->vec[i]);
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}
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}
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/*************************************************
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* Name: PQCLEAN_KYBER512_CLEAN_polyvec_add
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*
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* Description: Add vectors of polynomials
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*
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* Arguments: - polyvec *r: pointer to output vector of polynomials
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* - const polyvec *a: pointer to first input vector of polynomials
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* - const polyvec *b: pointer to second input vector of polynomials
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**************************************************/
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void PQCLEAN_KYBER512_CLEAN_polyvec_add(polyvec *r, const polyvec *a, const polyvec *b) {
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unsigned int i;
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for (i = 0; i < KYBER_K; i++) {
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PQCLEAN_KYBER512_CLEAN_poly_add(&r->vec[i], &a->vec[i], &b->vec[i]);
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}
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}
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