94 lines
4.4 KiB
C
94 lines
4.4 KiB
C
#include "poly.h"
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void PQCLEAN_NTRUHPS2048509_AVX2_poly_Sq_tobytes(unsigned char *r, const poly *a) {
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int i, j;
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uint16_t t[8];
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for (i = 0; i < NTRU_PACK_DEG / 8; i++) {
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for (j = 0; j < 8; j++) {
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t[j] = MODQ(a->coeffs[8 * i + j]);
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}
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r[11 * i + 0] = (unsigned char) ( t[0] & 0xff);
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r[11 * i + 1] = (unsigned char) ((t[0] >> 8) | ((t[1] & 0x1f) << 3));
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r[11 * i + 2] = (unsigned char) ((t[1] >> 5) | ((t[2] & 0x03) << 6));
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r[11 * i + 3] = (unsigned char) ((t[2] >> 2) & 0xff);
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r[11 * i + 4] = (unsigned char) ((t[2] >> 10) | ((t[3] & 0x7f) << 1));
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r[11 * i + 5] = (unsigned char) ((t[3] >> 7) | ((t[4] & 0x0f) << 4));
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r[11 * i + 6] = (unsigned char) ((t[4] >> 4) | ((t[5] & 0x01) << 7));
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r[11 * i + 7] = (unsigned char) ((t[5] >> 1) & 0xff);
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r[11 * i + 8] = (unsigned char) ((t[5] >> 9) | ((t[6] & 0x3f) << 2));
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r[11 * i + 9] = (unsigned char) ((t[6] >> 6) | ((t[7] & 0x07) << 5));
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r[11 * i + 10] = (unsigned char) ((t[7] >> 3));
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}
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for (j = 0; j < NTRU_PACK_DEG - 8 * i; j++) {
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t[j] = MODQ(a->coeffs[8 * i + j]);
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}
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for (; j < 8; j++) {
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t[j] = 0;
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}
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switch (NTRU_PACK_DEG & 0x07) {
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// cases 0 and 6 are impossible since 2 generates (Z/n)* and
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// p mod 8 in {1, 7} implies that 2 is a quadratic residue.
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case 4:
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r[11 * i + 0] = (unsigned char) (t[0] & 0xff);
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r[11 * i + 1] = (unsigned char) (t[0] >> 8) | ((t[1] & 0x1f) << 3);
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r[11 * i + 2] = (unsigned char) (t[1] >> 5) | ((t[2] & 0x03) << 6);
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r[11 * i + 3] = (unsigned char) (t[2] >> 2) & 0xff;
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r[11 * i + 4] = (unsigned char) (t[2] >> 10) | ((t[3] & 0x7f) << 1);
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r[11 * i + 5] = (unsigned char) (t[3] >> 7) | ((t[4] & 0x0f) << 4);
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break;
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case 2:
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r[11 * i + 0] = (unsigned char) (t[0] & 0xff);
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r[11 * i + 1] = (unsigned char) (t[0] >> 8) | ((t[1] & 0x1f) << 3);
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r[11 * i + 2] = (unsigned char) (t[1] >> 5) | ((t[2] & 0x03) << 6);
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break;
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}
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}
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void PQCLEAN_NTRUHPS2048509_AVX2_poly_Sq_frombytes(poly *r, const unsigned char *a) {
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int i;
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for (i = 0; i < NTRU_PACK_DEG / 8; i++) {
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r->coeffs[8 * i + 0] = (a[11 * i + 0] >> 0) | (((uint16_t)a[11 * i + 1] & 0x07) << 8);
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r->coeffs[8 * i + 1] = (a[11 * i + 1] >> 3) | (((uint16_t)a[11 * i + 2] & 0x3f) << 5);
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r->coeffs[8 * i + 2] = (a[11 * i + 2] >> 6) | (((uint16_t)a[11 * i + 3] & 0xff) << 2) | (((uint16_t)a[11 * i + 4] & 0x01) << 10);
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r->coeffs[8 * i + 3] = (a[11 * i + 4] >> 1) | (((uint16_t)a[11 * i + 5] & 0x0f) << 7);
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r->coeffs[8 * i + 4] = (a[11 * i + 5] >> 4) | (((uint16_t)a[11 * i + 6] & 0x7f) << 4);
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r->coeffs[8 * i + 5] = (a[11 * i + 6] >> 7) | (((uint16_t)a[11 * i + 7] & 0xff) << 1) | (((uint16_t)a[11 * i + 8] & 0x03) << 9);
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r->coeffs[8 * i + 6] = (a[11 * i + 8] >> 2) | (((uint16_t)a[11 * i + 9] & 0x1f) << 6);
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r->coeffs[8 * i + 7] = (a[11 * i + 9] >> 5) | (((uint16_t)a[11 * i + 10] & 0xff) << 3);
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}
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switch (NTRU_PACK_DEG & 0x07) {
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// cases 0 and 6 are impossible since 2 generates (Z/n)* and
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// p mod 8 in {1, 7} implies that 2 is a quadratic residue.
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case 4:
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r->coeffs[8 * i + 0] = (a[11 * i + 0] >> 0) | (((uint16_t)a[11 * i + 1] & 0x07) << 8);
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r->coeffs[8 * i + 1] = (a[11 * i + 1] >> 3) | (((uint16_t)a[11 * i + 2] & 0x3f) << 5);
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r->coeffs[8 * i + 2] = (a[11 * i + 2] >> 6) | (((uint16_t)a[11 * i + 3] & 0xff) << 2) | (((uint16_t)a[11 * i + 4] & 0x01) << 10);
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r->coeffs[8 * i + 3] = (a[11 * i + 4] >> 1) | (((uint16_t)a[11 * i + 5] & 0x0f) << 7);
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break;
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case 2:
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r->coeffs[8 * i + 0] = (a[11 * i + 0] >> 0) | (((uint16_t)a[11 * i + 1] & 0x07) << 8);
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r->coeffs[8 * i + 1] = (a[11 * i + 1] >> 3) | (((uint16_t)a[11 * i + 2] & 0x3f) << 5);
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break;
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}
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r->coeffs[NTRU_N - 1] = 0;
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}
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void PQCLEAN_NTRUHPS2048509_AVX2_poly_Rq_sum_zero_tobytes(unsigned char *r, const poly *a) {
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PQCLEAN_NTRUHPS2048509_AVX2_poly_Sq_tobytes(r, a);
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}
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void PQCLEAN_NTRUHPS2048509_AVX2_poly_Rq_sum_zero_frombytes(poly *r, const unsigned char *a) {
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int i;
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PQCLEAN_NTRUHPS2048509_AVX2_poly_Sq_frombytes(r, a);
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/* Set r[n-1] so that the sum of coefficients is zero mod q */
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r->coeffs[NTRU_N - 1] = 0;
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for (i = 0; i < NTRU_PACK_DEG; i++) {
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r->coeffs[NTRU_N - 1] -= r->coeffs[i];
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}
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}
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