417 lines
13 KiB
C
417 lines
13 KiB
C
#include "./polymul/toom-cook_4way.c"
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#include "SABER_indcpa.h"
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#include "SABER_params.h"
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#include "api.h"
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#include "cbd.h"
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#include "fips202.h"
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#include "pack_unpack.h"
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#include "randombytes.h"
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#include <stdint.h>
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#include <stdio.h>
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#include <string.h>
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//#include "randombytes.h"
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//#include "./polymul/toom_cook_4/toom-cook_4way.c"
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#define h1 4 //2^(EQ-EP-1)
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#define h2 ( (1<<(SABER_EP-2)) - (1<<(SABER_EP-SABER_ET-1)) + (1<<(SABER_EQ-SABER_EP-1)) )
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static void POL2MSG(uint8_t *message_dec, const uint16_t *message_dec_unpacked) {
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int32_t i, j;
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for (j = 0; j < SABER_KEYBYTES; j++) {
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message_dec[j] = 0;
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for (i = 0; i < 8; i++) {
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message_dec[j] = message_dec[j] | (message_dec_unpacked[j * 8 + i] << i);
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}
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}
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}
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/*-----------------------------------------------------------------------------------
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This routine generates a=[Matrix K x K] of 256-coefficient polynomials
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-------------------------------------------------------------------------------------*/
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static void GenMatrix(polyvec *a, const uint8_t *seed) {
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uint8_t buf[SABER_K * SABER_K * 13 * SABER_N / 8];
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uint16_t temp_ar[SABER_N];
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int i, j, k;
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uint16_t mod = (SABER_Q - 1);
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shake128(buf, sizeof(buf), seed, SABER_SEEDBYTES);
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for (i = 0; i < SABER_K; i++) {
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for (j = 0; j < SABER_K; j++) {
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PQCLEAN_LIGHTSABER_AVX2_BS2POLq(temp_ar, buf + (i * SABER_K + j) * 13 * SABER_N / 8);
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for (k = 0; k < SABER_N; k++) {
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a[i].vec[j].coeffs[k] = (temp_ar[k])& mod ;
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}
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}
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}
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}
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static void GenSecret(uint16_t r[SABER_K][SABER_N], const uint8_t *seed) {
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uint32_t i;
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uint8_t buf[SABER_MU * SABER_N * SABER_K / 8];
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shake128(buf, sizeof(buf), seed, SABER_NOISESEEDBYTES);
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for (i = 0; i < SABER_K; i++) {
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PQCLEAN_LIGHTSABER_AVX2_cbd(r[i], buf + i * SABER_MU * SABER_N / 8);
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}
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}
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//********************************matrix-vector mul routines*****************************************************
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static void matrix_vector_mul(__m256i res_avx[NUM_POLY][AVX_N1], __m256i a1_avx_combined[NUM_POLY][NUM_POLY][AVX_N1], __m256i b_bucket[NUM_POLY][SCHB_N * 4], int isTranspose) {
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int64_t i, j;
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__m256i c_bucket[2 * SCM_SIZE * 4]; //Holds results for 9 Karatsuba at a time
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for (i = 0; i < NUM_POLY; i++) {
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for (j = 0; j < NUM_POLY; j++) {
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if (isTranspose == 0) {
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toom_cook_4way_avx_n1(a1_avx_combined[i][j], b_bucket[j], c_bucket, j);
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} else {
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toom_cook_4way_avx_n1(a1_avx_combined[j][i], b_bucket[j], c_bucket, j);
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}
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}
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TC_interpol(c_bucket, res_avx[i]);
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}
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}
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static void vector_vector_mul(__m256i res_avx[AVX_N1], __m256i a_avx[NUM_POLY][AVX_N1], __m256i b_bucket[NUM_POLY][SCHB_N * 4]) {
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int64_t i;
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__m256i c_bucket[2 * SCM_SIZE * 4]; //Holds results for 9 Karatsuba at a time
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for (i = 0; i < NUM_POLY; i++) {
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toom_cook_4way_avx_n1(a_avx[i], b_bucket[i], c_bucket, i);
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}
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TC_interpol(c_bucket, res_avx);
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}
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//********************************matrix-vector mul routines*****************************************************
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void PQCLEAN_LIGHTSABER_AVX2_indcpa_kem_keypair(uint8_t *pk, uint8_t *sk) {
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polyvec a[SABER_K];
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uint16_t skpv1[SABER_K][SABER_N];
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uint8_t seed[SABER_SEEDBYTES];
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uint8_t noiseseed[SABER_COINBYTES];
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int32_t i, j, k;
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//--------------AVX declaration------------------
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__m256i sk_avx[SABER_K][SABER_N / 16];
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__m256i mod;
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__m256i res_avx[SABER_K][SABER_N / 16];
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__m256i a_avx[SABER_K][SABER_K][SABER_N / 16];
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//__m256i acc[2*SABER_N/16];
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mod = _mm256_set1_epi16(SABER_Q - 1);
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__m256i b_bucket[NUM_POLY][SCHB_N * 4];
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//--------------AVX declaration ends------------------
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randombytes(seed, SABER_SEEDBYTES);
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shake128(seed, SABER_SEEDBYTES, seed, SABER_SEEDBYTES); // for not revealing system RNG state
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randombytes(noiseseed, SABER_COINBYTES);
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GenMatrix(a, seed); //sample matrix A
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GenSecret(skpv1, noiseseed);
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// Load sk into avx vectors
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for (i = 0; i < SABER_K; i++) {
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for (j = 0; j < SABER_N / 16; j++) {
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sk_avx[i][j] = _mm256_loadu_si256 ((__m256i const *) (&skpv1[i][j * 16]));
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}
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}
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// Load a into avx vectors
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for (i = 0; i < SABER_K; i++) {
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for (j = 0; j < SABER_K; j++) {
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for (k = 0; k < SABER_N / 16; k++) {
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a_avx[i][j][k] = _mm256_loadu_si256 ((__m256i const *) (&a[i].vec[j].coeffs[k * 16]));
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}
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}
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}
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//------------------------do the matrix vector multiplication and rounding------------
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for (j = 0; j < NUM_POLY; j++) {
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TC_eval(sk_avx[j], b_bucket[j]);
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}
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matrix_vector_mul(res_avx, a_avx, b_bucket, 1);// Matrix-vector multiplication; Matrix in transposed order
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// Now truncation
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for (i = 0; i < SABER_K; i++) { //shift right EQ-EP bits
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for (j = 0; j < SABER_N / 16; j++) {
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res_avx[i][j] = _mm256_add_epi16 (res_avx[i][j], _mm256_set1_epi16(h1));
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res_avx[i][j] = _mm256_srli_epi16 (res_avx[i][j], (SABER_EQ - SABER_EP) );
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res_avx[i][j] = _mm256_and_si256 (res_avx[i][j], mod);
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}
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}
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//------------------Pack sk into byte string-------
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PQCLEAN_LIGHTSABER_AVX2_POLVEC2BS(sk, (const uint16_t (*)[SABER_N])skpv1, SABER_Q);
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//------------------Pack pk into byte string-------
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for (i = 0; i < SABER_K; i++) { // reuses skpv1[] for unpacking avx of public-key
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for (j = 0; j < SABER_N / 16; j++) {
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_mm256_maskstore_epi32 ((int *) (skpv1[i] + j * 16), _mm256_set1_epi32(-1), res_avx[i][j]);
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}
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}
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PQCLEAN_LIGHTSABER_AVX2_POLVEC2BS(pk, (const uint16_t (*)[SABER_N])skpv1, SABER_P); // load the public-key into pk byte string
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for (i = 0; i < SABER_SEEDBYTES; i++) { // now load the seedbytes in PK. Easy since seed bytes are kept in byte format.
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pk[SABER_POLYVECCOMPRESSEDBYTES + i] = seed[i];
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}
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}
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void PQCLEAN_LIGHTSABER_AVX2_indcpa_kem_enc(uint8_t ciphertext[SABER_BYTES_CCA_DEC], const uint8_t m[SABER_KEYBYTES], const uint8_t noiseseed[SABER_NOISESEEDBYTES], const uint8_t pk[SABER_INDCPA_PUBLICKEYBYTES]) {
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uint32_t i, j, k;
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polyvec a[SABER_K]; // skpv;
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uint8_t seed[SABER_SEEDBYTES];
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uint16_t pkcl[SABER_K][SABER_N]; //public key of received by the client
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uint16_t skpv1[SABER_K][SABER_N];
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uint16_t temp[SABER_K][SABER_N];
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uint16_t message[SABER_KEYBYTES * 8];
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uint8_t msk_c[SABER_SCALEBYTES_KEM];
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//--------------AVX declaration------------------
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__m256i sk_avx[SABER_K][SABER_N / 16];
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__m256i mod, mod_p;
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__m256i res_avx[SABER_K][SABER_N / 16];
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__m256i vprime_avx[SABER_N / 16];
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__m256i a_avx[SABER_K][SABER_K][SABER_N / 16];
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//__m256i acc[2*SABER_N/16];
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__m256i pkcl_avx[SABER_K][SABER_N / 16];
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__m256i message_avx[SABER_N / 16];
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mod = _mm256_set1_epi16(SABER_Q - 1);
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mod_p = _mm256_set1_epi16(SABER_P - 1);
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__m256i b_bucket[NUM_POLY][SCHB_N * 4];
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//--------------AVX declaration ends------------------
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for (i = 0; i < SABER_SEEDBYTES; i++) { // Load the seedbytes in the client seed from PK.
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seed[i] = pk[ SABER_POLYVECCOMPRESSEDBYTES + i];
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}
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GenMatrix(a, seed);
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GenSecret(skpv1, noiseseed);
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// ----------- Load skpv1 into avx vectors ----------
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for (i = 0; i < SABER_K; i++) {
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for (j = 0; j < SABER_N / 16; j++) {
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sk_avx[i][j] = _mm256_loadu_si256 ((__m256i const *) (&skpv1[i][j * 16]));
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}
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}
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// ----------- Load skpv1 into avx vectors ----------
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for (i = 0; i < SABER_K; i++) {
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for (j = 0; j < SABER_K; j++) {
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for (k = 0; k < SABER_N / 16; k++) {
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a_avx[i][j][k] = _mm256_loadu_si256 ((__m256i const *) (&a[i].vec[j].coeffs[k * 16]));
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}
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}
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}
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//-----------------matrix-vector multiplication and rounding
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for (j = 0; j < NUM_POLY; j++) {
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TC_eval(sk_avx[j], b_bucket[j]);
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}
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matrix_vector_mul(res_avx, a_avx, b_bucket, 0);// Matrix-vector multiplication; Matrix in normal order
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// Now truncation
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for (i = 0; i < SABER_K; i++) { //shift right EQ-EP bits
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for (j = 0; j < SABER_N / 16; j++) {
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res_avx[i][j] = _mm256_add_epi16 (res_avx[i][j], _mm256_set1_epi16(h1));
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res_avx[i][j] = _mm256_srli_epi16 (res_avx[i][j], (SABER_EQ - SABER_EP) );
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res_avx[i][j] = _mm256_and_si256 (res_avx[i][j], mod);
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}
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}
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//-----this result should be put in b_prime for later use in server.
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for (i = 0; i < SABER_K; i++) { // first store in 16 bit arrays
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for (j = 0; j < SABER_N / 16; j++) {
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_mm256_maskstore_epi32 ((int *)(temp[i] + j * 16), _mm256_set1_epi32(-1), res_avx[i][j]);
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}
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}
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PQCLEAN_LIGHTSABER_AVX2_POLVEC2BS(ciphertext, (const uint16_t (*)[SABER_N])temp, SABER_P); // Pack b_prime into ciphertext byte string
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//**************client matrix-vector multiplication ends******************//
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//------now calculate the v'
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//-------unpack the public_key
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PQCLEAN_LIGHTSABER_AVX2_BS2POLVEC(pkcl, pk, SABER_P);
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for (i = 0; i < SABER_K; i++) {
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for (j = 0; j < SABER_N / 16; j++) {
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pkcl_avx[i][j] = _mm256_loadu_si256 ((__m256i const *) (&pkcl[i][j * 16]));
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}
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}
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// InnerProduct
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//for(k=0;k<SABER_N/16;k++){
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// vprime_avx[k]=_mm256_xor_si256(vprime_avx[k],vprime_avx[k]);
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//}
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// vector-vector scalar multiplication with mod p
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vector_vector_mul(vprime_avx, pkcl_avx, b_bucket);
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// Computation of v'+h1
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for (i = 0; i < SABER_N / 16; i++) { //adding h1
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vprime_avx[i] = _mm256_add_epi16(vprime_avx[i], _mm256_set1_epi16(h1));
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}
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// unpack m;
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for (j = 0; j < SABER_KEYBYTES; j++) {
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for (i = 0; i < 8; i++) {
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message[8 * j + i] = ((m[j] >> i) & 0x01);
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}
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}
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// message encoding
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for (i = 0; i < SABER_N / 16; i++) {
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message_avx[i] = _mm256_loadu_si256 ((__m256i const *) (&message[i * 16]));
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message_avx[i] = _mm256_slli_epi16 (message_avx[i], (SABER_EP - 1) );
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}
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// SHIFTRIGHT(v'+h1-m mod p, EP-ET)
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for (k = 0; k < SABER_N / 16; k++) {
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vprime_avx[k] = _mm256_sub_epi16(vprime_avx[k], message_avx[k]);
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vprime_avx[k] = _mm256_and_si256(vprime_avx[k], mod_p);
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vprime_avx[k] = _mm256_srli_epi16 (vprime_avx[k], (SABER_EP - SABER_ET) );
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}
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// Unpack avx
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for (j = 0; j < SABER_N / 16; j++) {
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_mm256_maskstore_epi32 ((int *) (temp[0] + j * 16), _mm256_set1_epi32(-1), vprime_avx[j]);
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}
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PQCLEAN_LIGHTSABER_AVX2_SABER_pack_3bit(msk_c, temp[0]);
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for (j = 0; j < SABER_SCALEBYTES_KEM; j++) {
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ciphertext[SABER_CIPHERTEXTBYTES + j] = msk_c[j];
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}
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}
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void PQCLEAN_LIGHTSABER_AVX2_indcpa_kem_dec(uint8_t m[SABER_KEYBYTES], const uint8_t sk[SABER_INDCPA_SECRETKEYBYTES], const uint8_t ciphertext[SABER_BYTES_CCA_DEC]) {
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uint32_t i, j;
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uint16_t sksv[SABER_K][SABER_N]; //secret key of the server
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uint16_t pksv[SABER_K][SABER_N];
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uint16_t message_dec_unpacked[SABER_KEYBYTES * 8]; // one element containes on decrypted bit;
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uint8_t scale_ar[SABER_SCALEBYTES_KEM];
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uint16_t op[SABER_N];
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//--------------AVX declaration------------------
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//__m256i mod_p;
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__m256i v_avx[SABER_N / 16];
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//__m256i acc[2*SABER_N/16];
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__m256i sksv_avx[SABER_K][SABER_N / 16];
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__m256i pksv_avx[SABER_K][SABER_N / 16];
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//mod_p=_mm256_set1_epi16(SABER_P-1);
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__m256i b_bucket[NUM_POLY][SCHB_N * 4];
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//--------------AVX declaration ends------------------
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//-------unpack the public_key
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PQCLEAN_LIGHTSABER_AVX2_BS2POLVEC(sksv, sk, SABER_Q); //sksv is the secret-key
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PQCLEAN_LIGHTSABER_AVX2_BS2POLVEC(pksv, ciphertext, SABER_P); //pksv is the ciphertext
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for (i = 0; i < SABER_K; i++) {
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for (j = 0; j < SABER_N / 16; j++) {
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sksv_avx[i][j] = _mm256_loadu_si256 ((__m256i const *) (&sksv[i][j * 16]));
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pksv_avx[i][j] = _mm256_loadu_si256 ((__m256i const *) (&pksv[i][j * 16]));
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}
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}
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for (i = 0; i < SABER_N / 16; i++) {
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v_avx[i] = _mm256_xor_si256(v_avx[i], v_avx[i]);
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}
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// InnerProduct(b', s, mod p)
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for (j = 0; j < NUM_POLY; j++) {
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TC_eval(sksv_avx[j], b_bucket[j]);
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}
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vector_vector_mul(v_avx, pksv_avx, b_bucket);
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for (i = 0; i < SABER_N / 16; i++) {
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_mm256_maskstore_epi32 ((int *)(message_dec_unpacked + i * 16), _mm256_set1_epi32(-1), v_avx[i]);
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}
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for (i = 0; i < SABER_SCALEBYTES_KEM; i++) {
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scale_ar[i] = ciphertext[SABER_CIPHERTEXTBYTES + i];
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}
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PQCLEAN_LIGHTSABER_AVX2_SABER_un_pack3bit(op, scale_ar);
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//addition of h2
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for (i = 0; i < SABER_N; i++) {
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message_dec_unpacked[i] = ( ( message_dec_unpacked[i] + h2 - (op[i] << (SABER_EP - SABER_ET)) ) & (SABER_P - 1) ) >> (SABER_EP - 1);
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}
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POL2MSG(m, message_dec_unpacked);
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}
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