368 lines
16 KiB
C
368 lines
16 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_KYBER102490S_AVX2_poly_compress
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*
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* Description: Compression and subsequent serialization of a polynomial.
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* The coefficients of the input polynomial are assumed to
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* lie in the invertal [0,q], i.e. the polynomial must be reduced
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* by PQCLEAN_KYBER102490S_AVX2_poly_reduce().
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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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* - const poly *a: pointer to input polynomial
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**************************************************/
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void PQCLEAN_KYBER102490S_AVX2_poly_compress(uint8_t r[160], const poly *restrict a) {
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size_t i;
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uint32_t low;
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__m256i f0, f1;
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__m128i t0, t1;
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const __m256i v = _mm256_load_si256(&PQCLEAN_KYBER102490S_AVX2_qdata.vec[_16XV / 16]);
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const __m256i shift1 = _mm256_set1_epi16(1 << 10);
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const __m256i mask = _mm256_set1_epi16(31);
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const __m256i shift2 = _mm256_set1_epi16((32 << 8) + 1);
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const __m256i shift3 = _mm256_set1_epi32((1024 << 16) + 1);
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const __m256i sllvdidx = _mm256_set1_epi64x(12);
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const __m256i shufbidx = _mm256_set_epi8( 8, -1, -1, -1, -1, -1, 4, 3, 2, 1, 0, -1, 12, 11, 10, 9,
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-1, 12, 11, 10, 9, 8, -1, -1, -1, -1, -1, 4, 3, 2, 1, 0);
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for (i = 0; i < KYBER_N / 32; i++) {
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f0 = _mm256_load_si256(&a->vec[2 * i + 0]);
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f1 = _mm256_load_si256(&a->vec[2 * i + 1]);
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f0 = _mm256_mulhi_epi16(f0, v);
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f1 = _mm256_mulhi_epi16(f1, v);
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f0 = _mm256_mulhrs_epi16(f0, shift1);
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f1 = _mm256_mulhrs_epi16(f1, shift1);
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f0 = _mm256_and_si256(f0, mask);
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f1 = _mm256_and_si256(f1, mask);
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f0 = _mm256_packus_epi16(f0, f1);
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f0 = _mm256_maddubs_epi16(f0, shift2); // a0 a1 a2 a3 b0 b1 b2 b3 a4 a5 a6 a7 b4 b5 b6 b7
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f0 = _mm256_madd_epi16(f0, shift3); // a0 a1 b0 b1 a2 a3 b2 b3
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f0 = _mm256_sllv_epi32(f0, sllvdidx);
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f0 = _mm256_srlv_epi64(f0, sllvdidx);
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f0 = _mm256_shuffle_epi8(f0, shufbidx);
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t0 = _mm256_castsi256_si128(f0);
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t1 = _mm256_extracti128_si256(f0, 1);
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t0 = _mm_blendv_epi8(t0, t1, _mm256_castsi256_si128(shufbidx));
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_mm_storeu_si128((__m128i *)&r[20 * i + 0], t0);
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_mm_store_ss((float *)&low, _mm_castsi128_ps(t1));
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r[20 * i + 16] = (uint8_t)low;
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r[20 * i + 17] = (uint8_t)(low >> 0x08);
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r[20 * i + 18] = (uint8_t)(low >> 0x10);
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r[20 * i + 19] = (uint8_t)(low >> 0x18);
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}
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}
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void PQCLEAN_KYBER102490S_AVX2_poly_decompress(poly *restrict r, const uint8_t a[160]) {
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unsigned int i;
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int16_t h;
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__m128i t;
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__m256i f;
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const __m256i q = _mm256_load_si256(&PQCLEAN_KYBER102490S_AVX2_qdata.vec[_16XQ / 16]);
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const __m256i shufbidx = _mm256_set_epi8(9, 9, 9, 8, 8, 8, 8, 7, 7, 6, 6, 6, 6, 5, 5, 5,
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4, 4, 4, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 0, 0, 0);
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const __m256i mask = _mm256_set_epi16(248, 1984, 62, 496, 3968, 124, 992, 31,
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248, 1984, 62, 496, 3968, 124, 992, 31);
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const __m256i shift = _mm256_set_epi16(128, 16, 512, 64, 8, 256, 32, 1024,
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128, 16, 512, 64, 8, 256, 32, 1024);
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for (i = 0; i < KYBER_N / 16; i++) {
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t = _mm_loadl_epi64((__m128i *)&a[10 * i + 0]);
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h = (a[10 * i + 9] << 8) + a[10 * i + 8];
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t = _mm_insert_epi16(t, h, 4);
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f = _mm256_broadcastsi128_si256(t);
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f = _mm256_shuffle_epi8(f, shufbidx);
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f = _mm256_and_si256(f, mask);
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f = _mm256_mullo_epi16(f, shift);
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f = _mm256_mulhrs_epi16(f, q);
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_mm256_store_si256(&r->vec[i], f);
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}
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}
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/*************************************************
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* Name: PQCLEAN_KYBER102490S_AVX2_poly_tobytes
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*
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* Description: Serialization of a polynomial in NTT representation.
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* The coefficients of the input polynomial are assumed to
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* lie in the invertal [0,q], i.e. the polynomial must be reduced
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* by PQCLEAN_KYBER102490S_AVX2_poly_reduce(). The coefficients are orderd as output by
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* PQCLEAN_KYBER102490S_AVX2_poly_ntt(); the serialized output coefficients are in bitreversed
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* order.
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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_KYBER102490S_AVX2_poly_tobytes(uint8_t r[KYBER_POLYBYTES], poly *a) {
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PQCLEAN_KYBER102490S_AVX2_ntttobytes_avx(r, a->vec, PQCLEAN_KYBER102490S_AVX2_qdata.vec);
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}
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/*************************************************
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* Name: PQCLEAN_KYBER102490S_AVX2_poly_frombytes
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*
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* Description: De-serialization of a polynomial;
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* inverse of PQCLEAN_KYBER102490S_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_KYBER102490S_AVX2_poly_frombytes(poly *r, const uint8_t a[KYBER_POLYBYTES]) {
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PQCLEAN_KYBER102490S_AVX2_nttfrombytes_avx(r->vec, a, PQCLEAN_KYBER102490S_AVX2_qdata.vec);
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}
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/*************************************************
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* Name: PQCLEAN_KYBER102490S_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_KYBER102490S_AVX2_poly_frommsg(poly *restrict r, 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(&r->vec[0+2*(i)+0],g0); \
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_mm256_store_si256(&r->vec[0+2*(i)+1],g1); \
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_mm256_store_si256(&r->vec[8+2*(i)+0],g2); \
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_mm256_store_si256(&r->vec[8+2*(i)+1],g3)
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f = _mm256_loadu_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_KYBER102490S_AVX2_poly_tomsg
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*
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* Description: Convert polynomial to 32-byte message.
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* The coefficients of the input polynomial are assumed to
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* lie in the invertal [0,q], i.e. the polynomial must be reduced
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* by PQCLEAN_KYBER102490S_AVX2_poly_reduce().
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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_KYBER102490S_AVX2_poly_tomsg(uint8_t msg[KYBER_INDCPA_MSGBYTES], poly *restrict a) {
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unsigned int i;
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uint32_t small;
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__m256i f0, f1, g0, g1;
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const __m256i hq = _mm256_set1_epi16((KYBER_Q - 1) / 2);
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const __m256i hhq = _mm256_set1_epi16((KYBER_Q - 1) / 4);
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for (i = 0; i < KYBER_N / 32; i++) {
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f0 = _mm256_load_si256(&a->vec[2 * i + 0]);
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f1 = _mm256_load_si256(&a->vec[2 * i + 1]);
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f0 = _mm256_sub_epi16(hq, f0);
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f1 = _mm256_sub_epi16(hq, 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(f0, hhq);
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f1 = _mm256_sub_epi16(f1, hhq);
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f0 = _mm256_packs_epi16(f0, f1);
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small = _mm256_movemask_epi8(f0);
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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_KYBER102490S_AVX2_poly_getnoise_eta1
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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_ETA1
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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_KYBER102490S_AVX2_poly_getnoise_eta1(poly *r, const uint8_t seed[KYBER_SYMBYTES], uint8_t nonce) {
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ALIGNED_UINT8(KYBER_ETA1 * KYBER_N / 4 + 32) buf; // +32 bytes as required by PQCLEAN_KYBER102490S_AVX2_poly_cbd_eta1
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prf(buf.coeffs, KYBER_ETA1 * KYBER_N / 4, seed, nonce);
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PQCLEAN_KYBER102490S_AVX2_poly_cbd_eta1(r, buf.vec);
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}
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/*************************************************
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* Name: PQCLEAN_KYBER102490S_AVX2_poly_getnoise_eta2
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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_ETA2
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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_KYBER102490S_AVX2_poly_getnoise_eta2(poly *r, const uint8_t seed[KYBER_SYMBYTES], uint8_t nonce) {
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ALIGNED_UINT8(KYBER_ETA2 * KYBER_N / 4) buf;
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prf(buf.coeffs, KYBER_ETA2 * KYBER_N / 4, seed, nonce);
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PQCLEAN_KYBER102490S_AVX2_poly_cbd_eta2(r, buf.vec);
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}
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/*************************************************
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* Name: PQCLEAN_KYBER102490S_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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* Input coefficients assumed to be in normal order,
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* output coefficients are in special order that is natural
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* for the vectorization. Input coefficients are assumed to be
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* bounded by q in absolute value, output coefficients are bounded
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* by 16118 in absolute value.
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*
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* Arguments: - poly *r: pointer to in/output polynomial
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**************************************************/
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void PQCLEAN_KYBER102490S_AVX2_poly_ntt(poly *r) {
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PQCLEAN_KYBER102490S_AVX2_ntt_avx(r->vec, PQCLEAN_KYBER102490S_AVX2_qdata.vec);
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}
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/*************************************************
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* Name: PQCLEAN_KYBER102490S_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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* Input coefficients assumed to be in special order from vectorized
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* forward ntt, output in normal order. Input coefficients can be
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* arbitrary 16-bit integers, output coefficients are bounded by 14870
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* in absolute value.
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*
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* Arguments: - poly *a: pointer to in/output polynomial
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**************************************************/
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void PQCLEAN_KYBER102490S_AVX2_poly_invntt_tomont(poly *r) {
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PQCLEAN_KYBER102490S_AVX2_invntt_avx(r->vec, PQCLEAN_KYBER102490S_AVX2_qdata.vec);
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}
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void PQCLEAN_KYBER102490S_AVX2_poly_nttunpack(poly *r) {
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PQCLEAN_KYBER102490S_AVX2_nttunpack_avx(r->vec, PQCLEAN_KYBER102490S_AVX2_qdata.vec);
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}
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/*************************************************
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* Name: PQCLEAN_KYBER102490S_AVX2_poly_basemul_montgomery
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*
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* Description: Multiplication of two polynomials in NTT domain.
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* One of the input polynomials needs to have coefficients
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* bounded by q, the other polynomial can have arbitrary
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* coefficients. Output coefficients are bounded by 6656.
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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_KYBER102490S_AVX2_poly_basemul_montgomery(poly *r, const poly *a, const poly *b) {
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PQCLEAN_KYBER102490S_AVX2_basemul_avx(r->vec, a->vec, b->vec, PQCLEAN_KYBER102490S_AVX2_qdata.vec);
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}
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/*************************************************
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* Name: PQCLEAN_KYBER102490S_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_KYBER102490S_AVX2_poly_tomont(poly *r) {
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PQCLEAN_KYBER102490S_AVX2_tomont_avx(r->vec, PQCLEAN_KYBER102490S_AVX2_qdata.vec);
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}
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/*************************************************
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* Name: PQCLEAN_KYBER102490S_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_KYBER102490S_AVX2_poly_reduce(poly *r) {
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PQCLEAN_KYBER102490S_AVX2_reduce_avx(r->vec, PQCLEAN_KYBER102490S_AVX2_qdata.vec);
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}
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/*************************************************
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* Name: PQCLEAN_KYBER102490S_AVX2_poly_add
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*
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* Description: Add two polynomials. No modular reduction
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* is performed.
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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_KYBER102490S_AVX2_poly_add(poly *r, const poly *a, const poly *b) {
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unsigned int i;
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__m256i f0, f1;
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for (i = 0; i < KYBER_N / 16; i++) {
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f0 = _mm256_load_si256(&a->vec[i]);
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f1 = _mm256_load_si256(&b->vec[i]);
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f0 = _mm256_add_epi16(f0, f1);
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_mm256_store_si256(&r->vec[i], f0);
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}
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}
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/*************************************************
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* Name: PQCLEAN_KYBER102490S_AVX2_poly_sub
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*
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* Description: Subtract two polynomials. No modular reduction
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* is performed.
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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_KYBER102490S_AVX2_poly_sub(poly *r, const poly *a, const poly *b) {
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unsigned int i;
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__m256i f0, f1;
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|
for (i = 0; i < KYBER_N / 16; i++) {
|
|
f0 = _mm256_load_si256(&a->vec[i]);
|
|
f1 = _mm256_load_si256(&b->vec[i]);
|
|
f0 = _mm256_sub_epi16(f0, f1);
|
|
_mm256_store_si256(&r->vec[i], f0);
|
|
}
|
|
}
|