151 lines
6.1 KiB
C
151 lines
6.1 KiB
C
/// @file blas_comm.c
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/// @brief The standard implementations for blas_comm.h
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///
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#include "blas_comm.h"
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#include "blas.h"
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#include "gf.h"
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#include "rainbow_config.h"
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#include <stdint.h>
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#include <string.h>
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void PQCLEAN_RAINBOWIACLASSIC_CLEAN_gf256v_set_zero(uint8_t *b, unsigned int _num_byte) {
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gf256v_add(b, b, _num_byte);
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}
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/// @brief get an element from GF(16) vector .
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///
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/// @param[in] a - the input vector a.
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/// @param[in] i - the index in the vector a.
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/// @return the value of the element.
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///
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uint8_t PQCLEAN_RAINBOWIACLASSIC_CLEAN_gf16v_get_ele(const uint8_t *a, unsigned int i) {
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uint8_t r = a[i >> 1];
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uint8_t r0 = r & 0xf;
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uint8_t r1 = r >> 4;
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uint8_t m = (uint8_t)(-((int8_t)i & 1));
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return (uint8_t)((r1 & m) | ((~m) & r0));
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}
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/// @brief set an element for a GF(16) vector .
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///
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/// @param[in,out] a - the vector a.
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/// @param[in] i - the index in the vector a.
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/// @param[in] v - the value for the i-th element in vector a.
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/// @return the value of the element.
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///
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static uint8_t PQCLEAN_RAINBOWIACLASSIC_CLEAN_gf16v_set_ele(uint8_t *a, unsigned int i, uint8_t v) {
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uint8_t m = (uint8_t)(0xf ^ (-((int8_t)i & 1))); /// 1--> 0xf0 , 0--> 0x0f
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uint8_t ai_remaining = (uint8_t)(a[i >> 1] & (~m)); /// erase
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a[i >> 1] = (uint8_t)(ai_remaining | (m & (v << 4)) | (m & v & 0xf)); /// set
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return v;
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}
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static void gf16mat_prod_ref(uint8_t *c, const uint8_t *matA, unsigned int n_A_vec_byte, unsigned int n_A_width, const uint8_t *b) {
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PQCLEAN_RAINBOWIACLASSIC_CLEAN_gf256v_set_zero(c, n_A_vec_byte);
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for (unsigned int i = 0; i < n_A_width; i++) {
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uint8_t bb = PQCLEAN_RAINBOWIACLASSIC_CLEAN_gf16v_get_ele(b, i);
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gf16v_madd(c, matA, bb, n_A_vec_byte);
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matA += n_A_vec_byte;
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}
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}
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void PQCLEAN_RAINBOWIACLASSIC_CLEAN_gf16mat_mul(uint8_t *c, const uint8_t *a, const uint8_t *b, unsigned int len_vec) {
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unsigned int n_vec_byte = (len_vec + 1) / 2;
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for (unsigned int k = 0; k < len_vec; k++) {
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PQCLEAN_RAINBOWIACLASSIC_CLEAN_gf256v_set_zero(c, n_vec_byte);
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const uint8_t *bk = b + n_vec_byte * k;
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for (unsigned int i = 0; i < len_vec; i++) {
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uint8_t bb = PQCLEAN_RAINBOWIACLASSIC_CLEAN_gf16v_get_ele(bk, i);
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gf16v_madd(c, a + n_vec_byte * i, bb, n_vec_byte);
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}
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c += n_vec_byte;
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}
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}
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static unsigned int gf16mat_gauss_elim_ref(uint8_t *mat, unsigned int h, unsigned int w) {
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unsigned int n_w_byte = (w + 1) / 2;
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unsigned int r8 = 1;
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for (unsigned int i = 0; i < h; i++) {
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unsigned int offset_byte = i >> 1;
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uint8_t *ai = mat + n_w_byte * i;
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for (unsigned int j = i + 1; j < h; j++) {
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uint8_t *aj = mat + n_w_byte * j;
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gf256v_predicated_add(ai + offset_byte, !PQCLEAN_RAINBOWIACLASSIC_CLEAN_gf16_is_nonzero(PQCLEAN_RAINBOWIACLASSIC_CLEAN_gf16v_get_ele(ai, i)), aj + offset_byte, n_w_byte - offset_byte);
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}
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uint8_t pivot = PQCLEAN_RAINBOWIACLASSIC_CLEAN_gf16v_get_ele(ai, i);
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r8 &= PQCLEAN_RAINBOWIACLASSIC_CLEAN_gf16_is_nonzero(pivot);
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pivot = PQCLEAN_RAINBOWIACLASSIC_CLEAN_gf16_inv(pivot);
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offset_byte = (i + 1) >> 1;
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gf16v_mul_scalar(ai + offset_byte, pivot, n_w_byte - offset_byte);
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for (unsigned int j = 0; j < h; j++) {
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if (i == j) {
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continue;
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}
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uint8_t *aj = mat + n_w_byte * j;
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gf16v_madd(aj + offset_byte, ai + offset_byte, PQCLEAN_RAINBOWIACLASSIC_CLEAN_gf16v_get_ele(aj, i), n_w_byte - offset_byte);
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}
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}
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return r8;
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}
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static unsigned int gf16mat_solve_linear_eq_ref(uint8_t *sol, const uint8_t *inp_mat, const uint8_t *c_terms, unsigned int n) {
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uint8_t mat[64 * 33];
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unsigned int n_byte = (n + 1) >> 1;
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for (unsigned int i = 0; i < n; i++) {
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memcpy(mat + i * (n_byte + 1), inp_mat + i * n_byte, n_byte);
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mat[i * (n_byte + 1) + n_byte] = PQCLEAN_RAINBOWIACLASSIC_CLEAN_gf16v_get_ele(c_terms, i);
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}
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unsigned int r8 = PQCLEAN_RAINBOWIACLASSIC_CLEAN_gf16mat_gauss_elim(mat, n, n + 2);
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for (unsigned int i = 0; i < n; i++) {
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PQCLEAN_RAINBOWIACLASSIC_CLEAN_gf16v_set_ele(sol, i, mat[i * (n_byte + 1) + n_byte]);
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}
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return r8;
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}
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static inline void gf16mat_submat(uint8_t *mat2, unsigned int w2, unsigned int st, const uint8_t *mat, unsigned int w, unsigned int h) {
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unsigned int n_byte_w1 = (w + 1) / 2;
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unsigned int n_byte_w2 = (w2 + 1) / 2;
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unsigned int st_2 = st / 2;
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for (unsigned int i = 0; i < h; i++) {
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for (unsigned int j = 0; j < n_byte_w2; j++) {
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mat2[i * n_byte_w2 + j] = mat[i * n_byte_w1 + st_2 + j];
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}
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}
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}
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unsigned int PQCLEAN_RAINBOWIACLASSIC_CLEAN_gf16mat_inv(uint8_t *inv_a, const uint8_t *a, unsigned int H, uint8_t *buffer) {
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unsigned int n_w_byte = (H + 1) / 2;
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uint8_t *aa = buffer;
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for (unsigned int i = 0; i < H; i++) {
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uint8_t *ai = aa + i * 2 * n_w_byte;
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PQCLEAN_RAINBOWIACLASSIC_CLEAN_gf256v_set_zero(ai, 2 * n_w_byte);
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gf256v_add(ai, a + i * n_w_byte, n_w_byte);
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PQCLEAN_RAINBOWIACLASSIC_CLEAN_gf16v_set_ele(ai + n_w_byte, i, 1);
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}
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unsigned int r8 = PQCLEAN_RAINBOWIACLASSIC_CLEAN_gf16mat_gauss_elim(aa, H, 2 * H);
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gf16mat_submat(inv_a, H, H, aa, 2 * H, H);
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return r8;
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}
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// choosing the implementations depends on the macros _BLAS_AVX2_ and _BLAS_SSE
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#define gf16mat_prod_impl gf16mat_prod_ref
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#define gf16mat_gauss_elim_impl gf16mat_gauss_elim_ref
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#define gf16mat_solve_linear_eq_impl gf16mat_solve_linear_eq_ref
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void PQCLEAN_RAINBOWIACLASSIC_CLEAN_gf16mat_prod(uint8_t *c, const uint8_t *matA, unsigned int n_A_vec_byte, unsigned int n_A_width, const uint8_t *b) {
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gf16mat_prod_impl(c, matA, n_A_vec_byte, n_A_width, b);
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}
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unsigned int PQCLEAN_RAINBOWIACLASSIC_CLEAN_gf16mat_gauss_elim(uint8_t *mat, unsigned int h, unsigned int w) {
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return gf16mat_gauss_elim_impl(mat, h, w);
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}
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unsigned int PQCLEAN_RAINBOWIACLASSIC_CLEAN_gf16mat_solve_linear_eq(uint8_t *sol, const uint8_t *inp_mat, const uint8_t *c_terms, unsigned int n) {
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return gf16mat_solve_linear_eq_impl(sol, inp_mat, c_terms, n);
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}
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