47 lines
1.4 KiB
C
47 lines
1.4 KiB
C
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#include "poly.h"
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void PQCLEAN_NTRUHPS2048509_AVX2_poly_S3_tobytes(unsigned char msg[NTRU_OWCPA_MSGBYTES], const poly *a) {
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int i;
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unsigned char c;
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int j;
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for (i = 0; i < NTRU_PACK_DEG / 5; i++) {
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c = a->coeffs[5 * i + 4] & 255;
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c = (3 * c + a->coeffs[5 * i + 3]) & 255;
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c = (3 * c + a->coeffs[5 * i + 2]) & 255;
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c = (3 * c + a->coeffs[5 * i + 1]) & 255;
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c = (3 * c + a->coeffs[5 * i + 0]) & 255;
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msg[i] = c;
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}
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i = NTRU_PACK_DEG / 5;
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c = 0;
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for (j = NTRU_PACK_DEG - (5 * i) - 1; j >= 0; j--) {
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c = (3 * c + a->coeffs[5 * i + j]) & 255;
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}
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msg[i] = c;
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}
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void PQCLEAN_NTRUHPS2048509_AVX2_poly_S3_frombytes(poly *r, const unsigned char msg[NTRU_OWCPA_MSGBYTES]) {
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int i;
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unsigned char c;
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int j;
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for (i = 0; i < NTRU_PACK_DEG / 5; i++) {
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c = msg[i];
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r->coeffs[5 * i + 0] = c;
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r->coeffs[5 * i + 1] = c * 171 >> 9; // this is division by 3
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r->coeffs[5 * i + 2] = c * 57 >> 9; // division by 3^2
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r->coeffs[5 * i + 3] = c * 19 >> 9; // division by 3^3
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r->coeffs[5 * i + 4] = c * 203 >> 14; // etc.
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}
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i = NTRU_PACK_DEG / 5;
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c = msg[i];
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for (j = 0; (5 * i + j) < NTRU_PACK_DEG; j++) {
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r->coeffs[5 * i + j] = c;
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c = c * 171 >> 9;
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}
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r->coeffs[NTRU_N - 1] = 0;
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PQCLEAN_NTRUHPS2048509_AVX2_poly_mod_3_Phi_n(r);
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}
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