mirror of
https://github.com/henrydcase/pqc.git
synced 2024-11-23 07:59:01 +00:00
130 lines
5.1 KiB
C
130 lines
5.1 KiB
C
#ifndef GF2X_ARITH_MOD_XPLUSONE_H
|
|
#define GF2X_ARITH_MOD_XPLUSONE_H
|
|
|
|
#include "qc_ldpc_parameters.h"
|
|
|
|
#include "gf2x_arith.h"
|
|
#include "rng.h"
|
|
|
|
#define NUM_BITS_GF2X_ELEMENT (P) // 96221
|
|
#define NUM_DIGITS_GF2X_ELEMENT ((P+DIGIT_SIZE_b-1)/DIGIT_SIZE_b)
|
|
#define MSb_POSITION_IN_MSB_DIGIT_OF_ELEMENT ((P % DIGIT_SIZE_b) ? (P % DIGIT_SIZE_b)-1 : DIGIT_SIZE_b-1)
|
|
#define NUM_BITS_GF2X_MODULUS (P+1)
|
|
#define NUM_DIGITS_GF2X_MODULUS ((P+1+DIGIT_SIZE_b-1)/DIGIT_SIZE_b)
|
|
#define MSb_POSITION_IN_MSB_DIGIT_OF_MODULUS (P-DIGIT_SIZE_b*(NUM_DIGITS_GF2X_MODULUS-1))
|
|
#define INVALID_POS_VALUE (P)
|
|
#define P_BITS (17) // log_2(p) = 16.55406417
|
|
|
|
|
|
static inline void gf2x_copy(DIGIT dest[], const DIGIT in[]) {
|
|
for (int i = NUM_DIGITS_GF2X_ELEMENT - 1; i >= 0; i--) {
|
|
dest[i] = in[i];
|
|
}
|
|
}
|
|
|
|
/* returns the coefficient of the x^exponent term as the LSB of a digit */
|
|
static inline DIGIT gf2x_get_coeff(const DIGIT poly[], unsigned int exponent) {
|
|
unsigned int straightIdx = (NUM_DIGITS_GF2X_ELEMENT * DIGIT_SIZE_b - 1) - exponent;
|
|
unsigned int digitIdx = straightIdx / DIGIT_SIZE_b;
|
|
unsigned int inDigitIdx = straightIdx % DIGIT_SIZE_b;
|
|
return (poly[digitIdx] >> (DIGIT_SIZE_b - 1 - inDigitIdx)) & ((DIGIT) 1) ;
|
|
}
|
|
|
|
/* sets the coefficient of the x^exponent term as the LSB of a digit */
|
|
static inline void gf2x_set_coeff(DIGIT poly[], unsigned int exponent, DIGIT value) {
|
|
unsigned int straightIdx = (NUM_DIGITS_GF2X_ELEMENT * DIGIT_SIZE_b - 1) - exponent;
|
|
unsigned int digitIdx = straightIdx / DIGIT_SIZE_b;
|
|
unsigned int inDigitIdx = straightIdx % DIGIT_SIZE_b;
|
|
|
|
/* clear given coefficient */
|
|
DIGIT mask = ~( ((DIGIT) 1) << (DIGIT_SIZE_b - 1 - inDigitIdx));
|
|
poly[digitIdx] = poly[digitIdx] & mask;
|
|
poly[digitIdx] = poly[digitIdx] | (( value & ((DIGIT) 1)) << (DIGIT_SIZE_b - 1 - inDigitIdx));
|
|
}
|
|
|
|
/* toggles (flips) the coefficient of the x^exponent term as the LSB of a digit */
|
|
static inline void gf2x_toggle_coeff(DIGIT poly[], unsigned int exponent) {
|
|
unsigned int straightIdx = (NUM_DIGITS_GF2X_ELEMENT * DIGIT_SIZE_b - 1) - exponent;
|
|
unsigned int digitIdx = straightIdx / DIGIT_SIZE_b;
|
|
unsigned int inDigitIdx = straightIdx % DIGIT_SIZE_b;
|
|
|
|
/* clear given coefficient */
|
|
DIGIT mask = ( ((DIGIT) 1) << (DIGIT_SIZE_b - 1 - inDigitIdx));
|
|
poly[digitIdx] = poly[digitIdx] ^ mask;
|
|
}
|
|
|
|
/* population count for an unsigned 64-bit integer
|
|
Source: Hacker's delight, p.66 */
|
|
static int popcount_uint64t(uint64_t x) {
|
|
x -= (x >> 1) & 0x5555555555555555;
|
|
x = (x & 0x3333333333333333) + ((x >> 2) & 0x3333333333333333);
|
|
x = (x + (x >> 4)) & 0x0f0f0f0f0f0f0f0f;
|
|
return (int)((x * 0x0101010101010101) >> 56);
|
|
}
|
|
|
|
/* population count for a single polynomial */
|
|
static inline int population_count(DIGIT *poly) {
|
|
int ret = 0;
|
|
for (int i = NUM_DIGITS_GF2X_ELEMENT - 1; i >= 0; i--) {
|
|
ret += popcount_uint64t(poly[i]);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static inline void gf2x_mod_add(DIGIT Res[], const DIGIT A[], const DIGIT B[]) {
|
|
gf2x_add(Res, A, B, NUM_DIGITS_GF2X_ELEMENT);
|
|
}
|
|
|
|
static inline int partition(POSITION_T arr[], int lo, int hi) {
|
|
POSITION_T x = arr[hi];
|
|
POSITION_T tmp;
|
|
int i = (lo - 1);
|
|
for (int j = lo; j <= hi - 1; j++) {
|
|
if (arr[j] <= x) {
|
|
i++;
|
|
tmp = arr[i];
|
|
arr[i] = arr[j];
|
|
arr[j] = tmp;
|
|
}
|
|
}
|
|
tmp = arr[i + 1];
|
|
arr[i + 1] = arr[hi];
|
|
arr[hi] = tmp;
|
|
|
|
return i + 1;
|
|
}
|
|
|
|
static inline void quicksort_sparse(POSITION_T Res[]) {
|
|
int stack[DV * M];
|
|
int hi, lo, pivot, tos = -1;
|
|
stack[++tos] = 0;
|
|
stack[++tos] = (DV * M) - 1;
|
|
while (tos >= 0 ) {
|
|
hi = stack[tos--];
|
|
lo = stack[tos--];
|
|
pivot = partition(Res, lo, hi);
|
|
if ( (pivot - 1) > lo) {
|
|
stack[++tos] = lo;
|
|
stack[++tos] = pivot - 1;
|
|
}
|
|
if ( (pivot + 1) < hi) {
|
|
stack[++tos] = pivot + 1;
|
|
stack[++tos] = hi;
|
|
}
|
|
}
|
|
}
|
|
|
|
void PQCLEAN_LEDAKEMLT32_CLEAN_gf2x_mod_mul(DIGIT Res[], const DIGIT A[], const DIGIT B[]);
|
|
void PQCLEAN_LEDAKEMLT32_CLEAN_gf2x_transpose_in_place(DIGIT A[]);
|
|
void PQCLEAN_LEDAKEMLT32_CLEAN_rand_circulant_sparse_block(POSITION_T *pos_ones, int countOnes, AES_XOF_struct *seed_expander_ctx);
|
|
void PQCLEAN_LEDAKEMLT32_CLEAN_rand_circulant_blocks_sequence(DIGIT *sequence, AES_XOF_struct *seed_expander_ctx);
|
|
void PQCLEAN_LEDAKEMLT32_CLEAN_gf2x_mod_add_sparse(int sizeR, POSITION_T Res[], int sizeA, const POSITION_T A[], int sizeB, const POSITION_T B[]);
|
|
void PQCLEAN_LEDAKEMLT32_CLEAN_gf2x_transpose_in_place_sparse(int sizeA, POSITION_T A[]);
|
|
void PQCLEAN_LEDAKEMLT32_CLEAN_gf2x_mod_mul_sparse(size_t sizeR, POSITION_T Res[], size_t sizeA, const POSITION_T A[], size_t sizeB, const POSITION_T B[]);
|
|
void PQCLEAN_LEDAKEMLT32_CLEAN_gf2x_mod_mul_dense_to_sparse(DIGIT Res[], const DIGIT dense[], POSITION_T sparse[], unsigned int nPos);
|
|
void PQCLEAN_LEDAKEMLT32_CLEAN_gf2x_tobytes(uint8_t *bytes, const DIGIT *poly);
|
|
|
|
int PQCLEAN_LEDAKEMLT32_CLEAN_gf2x_mod_inverse(DIGIT out[], const DIGIT in[]);
|
|
|
|
#endif
|