357 lines
14 KiB
C
357 lines
14 KiB
C
#include "align.h"
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#include "cbd.h"
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#include "consts.h"
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#include "ntt.h"
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#include "params.h"
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#include "poly.h"
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#include "reduce.h"
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#include "symmetric.h"
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#include <immintrin.h>
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#include <stdint.h>
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/*************************************************
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* Name: PQCLEAN_KYBER512_AVX2_poly_compress
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*
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* Description: Compression and subsequent serialization of a polynomial
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*
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* Arguments: - uint8_t *r: pointer to output byte array
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* (of length KYBER_POLYCOMPRESSEDBYTES)
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* - poly *a: pointer to input polynomial
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**************************************************/
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void PQCLEAN_KYBER512_AVX2_poly_compress(uint8_t r[KYBER_POLYCOMPRESSEDBYTES], poly *restrict a) {
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unsigned int i = 0, j = 0;
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uint8_t t[8];
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PQCLEAN_KYBER512_AVX2_poly_csubq(a);
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for (i = 0; i < KYBER_N / 8; i++) {
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for (j = 0; j < 8; j++) {
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t[j] = ((((uint16_t)a->coeffs[8 * i + j] << 3) + KYBER_Q / 2) / KYBER_Q) & 7;
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}
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r[0] = (t[0] >> 0) | (t[1] << 3) | (t[2] << 6);
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r[1] = (t[2] >> 2) | (t[3] << 1) | (t[4] << 4) | (t[5] << 7);
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r[2] = (t[5] >> 1) | (t[6] << 2) | (t[7] << 5);
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r += 3;
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}
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}
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/*************************************************
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* Name: PQCLEAN_KYBER512_AVX2_poly_decompress
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*
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* Description: De-serialization and subsequent decompression of a polynomial;
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* approximate inverse of PQCLEAN_KYBER512_AVX2_poly_compress
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*
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* Arguments: - poly *r: pointer to output polynomial
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* - const uint8_t *a: pointer to input byte array
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* (of length KYBER_POLYCOMPRESSEDBYTES bytes)
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**************************************************/
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void PQCLEAN_KYBER512_AVX2_poly_decompress(poly *restrict r,
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const uint8_t a[KYBER_POLYCOMPRESSEDBYTES]) {
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unsigned int i = 0;
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unsigned int j = 0;
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uint8_t t[8];
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for (i = 0; i < KYBER_N / 8; i++) {
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t[0] = (a[0] >> 0);
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t[1] = (a[0] >> 3);
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t[2] = (a[0] >> 6) | (a[1] << 2);
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t[3] = (a[1] >> 1);
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t[4] = (a[1] >> 4);
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t[5] = (a[1] >> 7) | (a[2] << 1);
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t[6] = (a[2] >> 2);
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t[7] = (a[2] >> 5);
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a += 3;
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for (j = 0; j < 8; j++) {
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r->coeffs[8 * i + j] = ((uint16_t)(t[j] & 7) * KYBER_Q + 4) >> 3;
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}
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}
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}
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/*************************************************
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* Name: PQCLEAN_KYBER512_AVX2_poly_tobytes
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*
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* Description: Serialization of a polynomial
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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_POLYBYTES bytes)
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* - poly *a: pointer to input polynomial
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**************************************************/
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void PQCLEAN_KYBER512_AVX2_poly_tobytes(uint8_t r[KYBER_POLYBYTES], poly *a) {
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PQCLEAN_KYBER512_AVX2_ntttobytes_avx(r, a->coeffs, &PQCLEAN_KYBER512_AVX2_qdata);
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}
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/*************************************************
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* Name: PQCLEAN_KYBER512_AVX2_poly_frombytes
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*
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* Description: De-serialization of a polynomial;
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* inverse of PQCLEAN_KYBER512_AVX2_poly_tobytes
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*
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* Arguments: - poly *r: pointer to output polynomial
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* - const uint8_t *a: pointer to input byte array
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* (of KYBER_POLYBYTES bytes)
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**************************************************/
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void PQCLEAN_KYBER512_AVX2_poly_frombytes(poly *r, const uint8_t a[KYBER_POLYBYTES]) {
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PQCLEAN_KYBER512_AVX2_nttfrombytes_avx(r->coeffs, a, &PQCLEAN_KYBER512_AVX2_qdata);
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}
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/*************************************************
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* Name: PQCLEAN_KYBER512_AVX2_poly_frommsg
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*
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* Description: Convert 32-byte message to polynomial
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*
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* Arguments: - poly *r: pointer to output polynomial
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* - const uint8_t *msg: pointer to input message
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**************************************************/
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void PQCLEAN_KYBER512_AVX2_poly_frommsg(poly *restrict r,
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const uint8_t msg[KYBER_INDCPA_MSGBYTES]) {
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__m256i f, g0, g1, g2, g3, h0, h1, h2, h3;
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const __m256i shift = _mm256_broadcastsi128_si256(_mm_set_epi32(0, 1, 2, 3));
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const __m256i idx = _mm256_broadcastsi128_si256(_mm_set_epi8(15, 14, 11, 10, 7, 6, 3, 2, 13, 12, 9, 8, 5, 4, 1, 0));
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const __m256i hqs = _mm256_set1_epi16((KYBER_Q + 1) / 2);
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#define FROMMSG64(i) \
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g3 = _mm256_shuffle_epi32(f,0x55*(i)); \
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g3 = _mm256_sllv_epi32(g3,shift); \
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g3 = _mm256_shuffle_epi8(g3,idx); \
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g0 = _mm256_slli_epi16(g3,12); \
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g1 = _mm256_slli_epi16(g3,8); \
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g2 = _mm256_slli_epi16(g3,4); \
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g0 = _mm256_srai_epi16(g0,15); \
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g1 = _mm256_srai_epi16(g1,15); \
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g2 = _mm256_srai_epi16(g2,15); \
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g3 = _mm256_srai_epi16(g3,15); \
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g0 = _mm256_and_si256(g0,hqs); /* 19 18 17 16 3 2 1 0 */ \
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g1 = _mm256_and_si256(g1,hqs); /* 23 22 21 20 7 6 5 4 */ \
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g2 = _mm256_and_si256(g2,hqs); /* 27 26 25 24 11 10 9 8 */ \
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g3 = _mm256_and_si256(g3,hqs); /* 31 30 29 28 15 14 13 12 */ \
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h0 = _mm256_unpacklo_epi64(g0,g1); \
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h2 = _mm256_unpackhi_epi64(g0,g1); \
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h1 = _mm256_unpacklo_epi64(g2,g3); \
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h3 = _mm256_unpackhi_epi64(g2,g3); \
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g0 = _mm256_permute2x128_si256(h0,h1,0x20); \
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g2 = _mm256_permute2x128_si256(h0,h1,0x31); \
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g1 = _mm256_permute2x128_si256(h2,h3,0x20); \
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g3 = _mm256_permute2x128_si256(h2,h3,0x31); \
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_mm256_store_si256((__m256i *)&r->coeffs[ 0+32*(i)+ 0],g0); \
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_mm256_store_si256((__m256i *)&r->coeffs[ 0+32*(i)+16],g1); \
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_mm256_store_si256((__m256i *)&r->coeffs[128+32*(i)+ 0],g2); \
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_mm256_store_si256((__m256i *)&r->coeffs[128+32*(i)+16],g3)
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f = _mm256_load_si256((__m256i *)msg);
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FROMMSG64(0);
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FROMMSG64(1);
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FROMMSG64(2);
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FROMMSG64(3);
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}
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/*************************************************
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* Name: PQCLEAN_KYBER512_AVX2_poly_tomsg
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*
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* Description: Convert polynomial to 32-byte message
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*
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* Arguments: - uint8_t *msg: pointer to output message
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* - poly *a: pointer to input polynomial
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**************************************************/
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void PQCLEAN_KYBER512_AVX2_poly_tomsg(uint8_t msg[KYBER_INDCPA_MSGBYTES], poly *restrict a) {
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unsigned int i = 0;
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uint32_t small = 0;
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__m256i f0, f1, g0, g1;
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const __m256i hqs = _mm256_set1_epi16((KYBER_Q - 1) / 2);
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const __m256i hhqs = _mm256_set1_epi16((KYBER_Q - 5) / 4);
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for (i = 0; i < KYBER_N / 32; i++) {
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f0 = _mm256_load_si256((__m256i *)&a->coeffs[32 * i]);
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f1 = _mm256_load_si256((__m256i *)&a->coeffs[32 * i + 16]);
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f0 = _mm256_sub_epi16(hqs, f0);
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f1 = _mm256_sub_epi16(hqs, f1);
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g0 = _mm256_srai_epi16(f0, 15);
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g1 = _mm256_srai_epi16(f1, 15);
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f0 = _mm256_xor_si256(f0, g0);
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f1 = _mm256_xor_si256(f1, g1);
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f0 = _mm256_sub_epi16(hhqs, f0);
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f1 = _mm256_sub_epi16(hhqs, f1);
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f0 = _mm256_packs_epi16(f0, f1);
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small = _mm256_movemask_epi8(f0);
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small = ~small;
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msg[4 * i + 0] = small;
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msg[4 * i + 1] = small >> 16;
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msg[4 * i + 2] = small >> 8;
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msg[4 * i + 3] = small >> 24;
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}
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}
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/*************************************************
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* Name: PQCLEAN_KYBER512_AVX2_poly_getnoise
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*
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* Description: Sample a polynomial deterministically from a seed and a nonce,
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* with output polynomial close to centered binomial distribution
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* with parameter KYBER_ETA
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*
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* Arguments: - poly *r: pointer to output polynomial
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* - const uint8_t *seed: pointer to input seed
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* (of length KYBER_SYMBYTES bytes)
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* - uint8_t nonce: one-byte input nonce
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**************************************************/
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void PQCLEAN_KYBER512_AVX2_poly_getnoise(poly *r, const uint8_t seed[KYBER_SYMBYTES], uint8_t nonce) {
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ALIGN32_ARRAY(uint8_t, KYBER_ETA * KYBER_N / 4) buf;
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prf(buf.arr, sizeof(buf.arr), seed, nonce);
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PQCLEAN_KYBER512_AVX2_cbd(r, buf.arr);
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}
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void PQCLEAN_KYBER512_AVX2_poly_getnoise4x(poly *r0,
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poly *r1,
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poly *r2,
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poly *r3,
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const uint8_t seed[32],
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uint8_t nonce0,
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uint8_t nonce1,
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uint8_t nonce2,
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uint8_t nonce3) {
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ALIGN32_ARRAY_2D(uint8_t, 4, 160) buf;
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__m256i f;
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keccakx4_state state;
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f = _mm256_load_si256((__m256i *)seed);
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_mm256_store_si256((__m256i *)buf.arr[0], f);
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_mm256_store_si256((__m256i *)buf.arr[1], f);
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_mm256_store_si256((__m256i *)buf.arr[2], f);
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_mm256_store_si256((__m256i *)buf.arr[3], f);
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buf.arr[0][32] = nonce0;
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buf.arr[1][32] = nonce1;
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buf.arr[2][32] = nonce2;
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buf.arr[3][32] = nonce3;
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PQCLEAN_KYBER512_AVX2_shake256x4_absorb(&state, buf.arr[0], buf.arr[1], buf.arr[2], buf.arr[3], 33);
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PQCLEAN_KYBER512_AVX2_shake256x4_squeezeblocks(buf.arr[0], buf.arr[1], buf.arr[2], buf.arr[3], 1, &state);
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PQCLEAN_KYBER512_AVX2_cbd(r0, buf.arr[0]);
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PQCLEAN_KYBER512_AVX2_cbd(r1, buf.arr[1]);
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PQCLEAN_KYBER512_AVX2_cbd(r2, buf.arr[2]);
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PQCLEAN_KYBER512_AVX2_cbd(r3, buf.arr[3]);
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}
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/*************************************************
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* Name: PQCLEAN_KYBER512_AVX2_poly_ntt
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*
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* Description: Computes negacyclic number-theoretic transform (NTT) of
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* a polynomial in place;
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* inputs assumed to be in normal order, output in bitreversed order
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*
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* Arguments: - uint16_t *r: pointer to in/output polynomial
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**************************************************/
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void PQCLEAN_KYBER512_AVX2_poly_ntt(poly *r) {
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PQCLEAN_KYBER512_AVX2_ntt_avx(r->coeffs, &PQCLEAN_KYBER512_AVX2_qdata);
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}
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/*************************************************
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* Name: PQCLEAN_KYBER512_AVX2_poly_invntt_tomont
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*
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* Description: Computes inverse of negacyclic number-theoretic transform (NTT)
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* of a polynomial in place;
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* inputs assumed to be in bitreversed order, output in normal order
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*
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* Arguments: - uint16_t *a: pointer to in/output polynomial
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**************************************************/
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void PQCLEAN_KYBER512_AVX2_poly_invntt_tomont(poly *r) {
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PQCLEAN_KYBER512_AVX2_invntt_avx(r->coeffs, &PQCLEAN_KYBER512_AVX2_qdata);
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}
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void PQCLEAN_KYBER512_AVX2_poly_nttunpack(poly *r) {
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PQCLEAN_KYBER512_AVX2_nttunpack_avx(r->coeffs, &PQCLEAN_KYBER512_AVX2_qdata);
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}
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/*************************************************
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* Name: PQCLEAN_KYBER512_AVX2_poly_basemul_montgomery
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*
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* Description: Multiplication of two polynomials in NTT domain
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*
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* Arguments: - poly *r: pointer to output polynomial
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* - const poly *a: pointer to first input polynomial
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* - const poly *b: pointer to second input polynomial
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**************************************************/
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void PQCLEAN_KYBER512_AVX2_poly_basemul_montgomery(poly *r, const poly *a, const poly *b) {
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PQCLEAN_KYBER512_AVX2_basemul_avx(r->coeffs, a->coeffs, b->coeffs, &PQCLEAN_KYBER512_AVX2_qdata);
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}
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/*************************************************
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* Name: PQCLEAN_KYBER512_AVX2_poly_tomont
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*
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* Description: Inplace conversion of all coefficients of a polynomial
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* from normal domain to Montgomery domain
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*
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* Arguments: - poly *r: pointer to input/output polynomial
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**************************************************/
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void PQCLEAN_KYBER512_AVX2_poly_tomont(poly *r) {
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PQCLEAN_KYBER512_AVX2_tomont_avx(r->coeffs, &PQCLEAN_KYBER512_AVX2_qdata);
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}
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/*************************************************
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* Name: PQCLEAN_KYBER512_AVX2_poly_reduce
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*
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* Description: Applies Barrett reduction to all coefficients of a polynomial
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* for details of the Barrett reduction see comments in reduce.c
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*
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* Arguments: - poly *r: pointer to input/output polynomial
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**************************************************/
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void PQCLEAN_KYBER512_AVX2_poly_reduce(poly *r) {
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PQCLEAN_KYBER512_AVX2_reduce_avx(r->coeffs, &PQCLEAN_KYBER512_AVX2_qdata);
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}
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/*************************************************
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* Name: PQCLEAN_KYBER512_AVX2_poly_csubq
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*
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* Description: Applies conditional subtraction of q to each coefficient
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* of a polynomial. For details of conditional subtraction
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* of q see comments in reduce.c
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*
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* Arguments: - poly *r: pointer to input/output polynomial
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**************************************************/
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void PQCLEAN_KYBER512_AVX2_poly_csubq(poly *r) {
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PQCLEAN_KYBER512_AVX2_csubq_avx(r->coeffs, &PQCLEAN_KYBER512_AVX2_qdata);
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}
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/*************************************************
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* Name: PQCLEAN_KYBER512_AVX2_poly_add
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*
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* Description: Add two polynomials
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*
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* Arguments: - poly *r: pointer to output polynomial
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* - const poly *a: pointer to first input polynomial
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* - const poly *b: pointer to second input polynomial
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**************************************************/
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void PQCLEAN_KYBER512_AVX2_poly_add(poly *r, const poly *a, const poly *b) {
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unsigned int i = 0;
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__m256i f0, f1;
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for (i = 0; i < KYBER_N; i += 16) {
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f0 = _mm256_load_si256((__m256i *)&a->coeffs[i]);
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f1 = _mm256_load_si256((__m256i *)&b->coeffs[i]);
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f0 = _mm256_add_epi16(f0, f1);
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_mm256_store_si256((__m256i *)&r->coeffs[i], f0);
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}
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}
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/*************************************************
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* Name: PQCLEAN_KYBER512_AVX2_poly_sub
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*
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* Description: Subtract two polynomials
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*
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* Arguments: - poly *r: pointer to output polynomial
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* - const poly *a: pointer to first input polynomial
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* - const poly *b: pointer to second input polynomial
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**************************************************/
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void PQCLEAN_KYBER512_AVX2_poly_sub(poly *r, const poly *a, const poly *b) {
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unsigned int i = 0;
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__m256i f0, f1;
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for (i = 0; i < KYBER_N; i += 16) {
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f0 = _mm256_load_si256((__m256i *)&a->coeffs[i]);
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f1 = _mm256_load_si256((__m256i *)&b->coeffs[i]);
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f0 = _mm256_sub_epi16(f0, f1);
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_mm256_store_si256((__m256i *)&r->coeffs[i], f0);
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}
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}
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