23 lines
611 B
C
23 lines
611 B
C
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#include "poly_mul.h"
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#include "SABER_params.h"
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#include <stdint.h>
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#include <string.h>
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void PQCLEAN_LIGHTSABER_CLEAN_pol_mul(const uint16_t *a, const uint16_t *b, uint16_t *res, uint16_t p, uint32_t n) {
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// Polynomial multiplication using the schoolbook method, c[x] = a[x]*b[x]
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// normal multiplication
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uint16_t c[2 * SABER_N] = {0};
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for (size_t i = 0; i < SABER_N; i++) {
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for (size_t j = 0; j < SABER_N; j++) {
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c[i + j] += a[i] * b[j];
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}
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}
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// reduction
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for (size_t i = n; i < 2 * n; i++) {
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res[i - n] = (c[i - n] - c[i]) & (p - 1);
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}
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}
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