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more cleaning

master
Leon 5 years ago
parent
6f31e7e4c2
commit
e4add57844
11 changed files with 85 additions and 185 deletions
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  1. +3
    -9
      crypto_kem/ledakemlt12/clean/H_Q_matrices_generation.h
  2. +1
    -1
      crypto_kem/ledakemlt12/clean/Makefile
  3. +2
    -2
      crypto_kem/ledakemlt12/clean/bf_decoding.h
  4. +6
    -7
      crypto_kem/ledakemlt12/clean/gf2x_arith.h
  5. +27
    -31
      crypto_kem/ledakemlt12/clean/gf2x_arith_mod_xPplusOne.c
  6. +23
    -52
      crypto_kem/ledakemlt12/clean/gf2x_arith_mod_xPplusOne.h
  7. +0
    -18
      crypto_kem/ledakemlt12/clean/gf2x_limbs.h
  8. +5
    -12
      crypto_kem/ledakemlt12/clean/kem.c
  9. +15
    -32
      crypto_kem/ledakemlt12/clean/niederreiter.c
  10. +3
    -18
      crypto_kem/ledakemlt12/clean/niederreiter.h
  11. +0
    -3
      crypto_kem/ledakemlt12/clean/rng.h

+ 3
- 9
crypto_kem/ledakemlt12/clean/H_Q_matrices_generation.h View File

@@ -1,17 +1,11 @@
#ifndef H_Q_MATRICES_GENERATION_H
#define H_Q_MATRICES_GENERATION_H

#include "gf2x_limbs.h"
#include "gf2x_arith.h"
#include "qc_ldpc_parameters.h"
#include "rng.h"

void PQCLEAN_LEDAKEMLT12_CLEAN_generateHPosOnes_HtrPosOnes(
POSITION_T HPosOnes[N0][DV],
POSITION_T HtrPosOnes[N0][DV],
AES_XOF_struct *niederreiter_keys_expander);

void PQCLEAN_LEDAKEMLT12_CLEAN_generateQsparse(
POSITION_T pos_ones[N0][M],
AES_XOF_struct *niederreiter_keys_expander);
void PQCLEAN_LEDAKEMLT12_CLEAN_generateHPosOnes_HtrPosOnes(POSITION_T HPosOnes[N0][DV], POSITION_T HtrPosOnes[N0][DV], AES_XOF_struct *niederreiter_keys_expander);
void PQCLEAN_LEDAKEMLT12_CLEAN_generateQsparse(POSITION_T pos_ones[N0][M], AES_XOF_struct *niederreiter_keys_expander);

#endif

+ 1
- 1
crypto_kem/ledakemlt12/clean/Makefile View File

@@ -2,7 +2,7 @@

LIB=libledakemlt12_clean.a
HEADERS=api.h bf_decoding.h dfr_test.h gf2x_arith_mod_xPplusOne.h \
gf2x_arith.h gf2x_limbs.h H_Q_matrices_generation.h \
gf2x_arith.h H_Q_matrices_generation.h \
niederreiter.h qc_ldpc_parameters.h rng.h

OBJECTS=bf_decoding.o dfr_test.o gf2x_arith_mod_xPplusOne.o \


+ 2
- 2
crypto_kem/ledakemlt12/clean/bf_decoding.h View File

@@ -1,7 +1,7 @@
#ifndef BF_DECODING_H
#define BF_DECODING_H

#include "gf2x_limbs.h"
#include "gf2x_arith.h"
#include "qc_ldpc_parameters.h"

/* Definitions for DFR level 2^-SL with SL=128 */
@@ -11,7 +11,7 @@

int PQCLEAN_LEDAKEMLT12_CLEAN_bf_decoding(DIGIT err[],
const POSITION_T HtrPosOnes[N0][DV],
const POSITION_T QtrPosOnes[N0][M], // N0 vectors containing exp.s of Qtr ones
const POSITION_T QtrPosOnes[N0][M],
DIGIT privateSyndrome[]);

#endif

+ 6
- 7
crypto_kem/ledakemlt12/clean/gf2x_arith.h View File

@@ -1,7 +1,8 @@
#ifndef GF2X_ARITH_H
#define GF2X_ARITH_H

#include "gf2x_limbs.h"
#include <inttypes.h>
#include <stddef.h>

/*
* Elements of GF(2)[x] are stored in compact dense binary form.
@@ -42,9 +43,12 @@
* position[A_{0}] == n-1
*/

typedef uint64_t DIGIT;
#define DIGIT_SIZE_B (8)
#define DIGIT_SIZE_b (DIGIT_SIZE_B << 3)
#define POSITION_T uint32_t

#define GF2X_MUL PQCLEAN_LEDAKEMLT12_CLEAN_gf2x_mul_comb
// #define GF2X_MUL gf2x_mul_comb

static inline void gf2x_add(DIGIT Res[], const DIGIT A[], const DIGIT B[], size_t nr) {
for (size_t i = 0; i < nr; i++) {
@@ -52,13 +56,8 @@ static inline void gf2x_add(DIGIT Res[], const DIGIT A[], const DIGIT B[], size_
}
}

/* PRE: MAX ALLOWED ROTATION AMOUNT : DIGIT_SIZE_b */
void PQCLEAN_LEDAKEMLT12_CLEAN_right_bit_shift_n(size_t length, DIGIT in[], unsigned int amount);

/* PRE: MAX ALLOWED ROTATION AMOUNT : DIGIT_SIZE_b */
void PQCLEAN_LEDAKEMLT12_CLEAN_left_bit_shift_n(size_t length, DIGIT in[], unsigned int amount);

void GF2X_MUL(int nr, DIGIT Res[], int na, const DIGIT A[], int nb, const DIGIT B[]);


#endif

+ 27
- 31
crypto_kem/ledakemlt12/clean/gf2x_arith_mod_xPplusOne.c View File

@@ -7,7 +7,7 @@

static void gf2x_mod(DIGIT out[], const DIGIT in[]) {

int i, j, posTrailingBit, maskOffset;
int i, j, posTrailingBit, maskOffset, to_copy;
DIGIT mask, aux[2 * NUM_DIGITS_GF2X_ELEMENT];

memcpy(aux, in, 2 * NUM_DIGITS_GF2X_ELEMENT * DIGIT_SIZE_B);
@@ -46,7 +46,7 @@ static void gf2x_mod(DIGIT out[], const DIGIT in[]) {
}
}

int to_copy = (2 * NUM_DIGITS_GF2X_ELEMENT > NUM_DIGITS_GF2X_ELEMENT) ? NUM_DIGITS_GF2X_ELEMENT : 2 * NUM_DIGITS_GF2X_ELEMENT;
to_copy = (2 * NUM_DIGITS_GF2X_ELEMENT > NUM_DIGITS_GF2X_ELEMENT) ? NUM_DIGITS_GF2X_ELEMENT : 2 * NUM_DIGITS_GF2X_ELEMENT;

for (i = 0; i < to_copy; i++) {
out[NUM_DIGITS_GF2X_ELEMENT - 1 - i] = aux[2 * NUM_DIGITS_GF2X_ELEMENT - 1 - i];
@@ -93,31 +93,19 @@ static void left_bit_shift_wide_n(const int length, DIGIT in[], unsigned int amo
PQCLEAN_LEDAKEMLT12_CLEAN_left_bit_shift_n(length, in, amount % DIGIT_SIZE_b);
}

static uint8_t byte_reverse_with_64bitDIGIT(uint8_t b) {
b = (uint8_t)((b * 0x0202020202ULL & 0x010884422010ULL) % 1023);
return b;
}

/* https://stackoverflow.com/questions/2182002/convert-big-endian-to-little-endian-in-c-without-using-provided-func */
static uint64_t swap_uint64( uint64_t val ) {
val = ((val << 8) & 0xFF00FF00FF00FF00ULL ) | ((val >> 8) & 0x00FF00FF00FF00FFULL );
val = ((val << 16) & 0xFFFF0000FFFF0000ULL ) | ((val >> 16) & 0x0000FFFF0000FFFFULL );
return (val << 32) | (val >> 32);
}

static DIGIT reverse_digit(const DIGIT b) {
int i;
union toReverse_t {
uint8_t inByte[DIGIT_SIZE_B];
DIGIT digitValue;
} toReverse;

toReverse.digitValue = b;
for (i = 0; i < DIGIT_SIZE_B; i++) {
toReverse.inByte[i] = byte_reverse_with_64bitDIGIT(toReverse.inByte[i]);
}

return swap_uint64(toReverse.digitValue);
/* Hackers delight, reverses a uint64_t */
static DIGIT reverse_digit(DIGIT x) {
uint64_t t;
x = (x << 31) | (x >> 33);
t = (x ^ (x >> 20)) & 0x00000FFF800007FFLL;
x = (t | (t << 20)) ^ x;
t = (x ^ (x >> 8)) & 0x00F8000F80700807LL;
x = (t | (t << 8)) ^ x;
t = (x ^ (x >> 4)) & 0x0808708080807008LL;
x = (t | (t << 4)) ^ x;
t = (x ^ (x >> 2)) & 0x1111111111111111LL;
x = (t | (t << 2)) ^ x;
return x;
}

void PQCLEAN_LEDAKEMLT12_CLEAN_gf2x_transpose_in_place(DIGIT A[]) {
@@ -137,11 +125,11 @@ void PQCLEAN_LEDAKEMLT12_CLEAN_gf2x_transpose_in_place(DIGIT A[]) {
A[i] = rev2;
A[NUM_DIGITS_GF2X_ELEMENT - 1 - i] = rev1;
}
/*


if (NUM_DIGITS_GF2X_ELEMENT % 2 == 1) {
A[NUM_DIGITS_GF2X_ELEMENT / 2] = reverse_digit(A[NUM_DIGITS_GF2X_ELEMENT / 2]);
}*/
A[NUM_DIGITS_GF2X_ELEMENT / 2] = reverse_digit(A[NUM_DIGITS_GF2X_ELEMENT / 2]);
}

if (slack_bits_amount) {
PQCLEAN_LEDAKEMLT12_CLEAN_right_bit_shift_n(NUM_DIGITS_GF2X_ELEMENT, A, slack_bits_amount);
@@ -220,7 +208,6 @@ static void gf2x_swap(const int length,
* (Chapter 11 -- Algorithm 11.44 -- pag 223)
*
*/

int PQCLEAN_LEDAKEMLT12_CLEAN_gf2x_mod_inverse(DIGIT out[], const DIGIT in[]) { /* in^{-1} mod x^P-1 */

int i;
@@ -533,3 +520,12 @@ void PQCLEAN_LEDAKEMLT12_CLEAN_rand_circulant_blocks_sequence(
}

}

void PQCLEAN_LEDAKEMLT12_CLEAN_gf2x_tobytes(uint8_t *bytes, const DIGIT *poly) {
size_t i, j;
for (i = 0; i < NUM_DIGITS_GF2X_ELEMENT; i++) {
for (j = 0; j < DIGIT_SIZE_B; j++) {
bytes[i * DIGIT_SIZE_B + j] = (uint8_t) ((poly[i] >> (8 * j)) & 0xFF);
}
}
}

+ 23
- 52
crypto_kem/ledakemlt12/clean/gf2x_arith_mod_xPplusOne.h View File

@@ -1,23 +1,19 @@
#ifndef GF2X_ARITH_MOD_XPLUSONE_H
#define GF2X_ARITH_MOD_XPLUSONE_H

#include "gf2x_limbs.h"
#include "qc_ldpc_parameters.h"

#include "gf2x_arith.h"
#include "rng.h"

#define NUM_BITS_GF2X_ELEMENT (P) // 52147
#define NUM_DIGITS_GF2X_ELEMENT ((P+DIGIT_SIZE_b-1)/DIGIT_SIZE_b) // 815
#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 (16) // log_2(p) = 15.6703
#define NUM_BITS_GF2X_ELEMENT (P) // 52147
#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 (16) // log_2(p) = 15.6703


static inline void gf2x_copy(DIGIT dest[], const DIGIT in[]) {
@@ -43,8 +39,7 @@ static inline void gf2x_set_coeff(DIGIT poly[], unsigned int exponent, DIGIT val
/* 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));
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 */
@@ -58,8 +53,8 @@ static inline void gf2x_toggle_coeff(DIGIT poly[], unsigned int exponent) {
poly[digitIdx] = poly[digitIdx] ^ mask;
}

/* population count for an unsigned 64-bit integer */
/* 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);
@@ -80,42 +75,6 @@ static inline void gf2x_mod_add(DIGIT Res[], const DIGIT A[], const DIGIT B[]) {
gf2x_add(Res, A, B, NUM_DIGITS_GF2X_ELEMENT);
}

void PQCLEAN_LEDAKEMLT12_CLEAN_gf2x_mod_mul(DIGIT Res[], const DIGIT A[], const DIGIT B[]);

int PQCLEAN_LEDAKEMLT12_CLEAN_gf2x_mod_inverse(DIGIT out[], const DIGIT in[]);

/* in place bit-transp. of a(x) % x^P+1, e.g.: a3 a2 a1 a0 --> a1 a2 a3 a0 */
void PQCLEAN_LEDAKEMLT12_CLEAN_gf2x_transpose_in_place(DIGIT A[]);

void PQCLEAN_LEDAKEMLT12_CLEAN_rand_circulant_sparse_block(
POSITION_T *pos_ones,
int countOnes,
AES_XOF_struct *seed_expander_ctx);

void PQCLEAN_LEDAKEMLT12_CLEAN_rand_circulant_blocks_sequence(
DIGIT sequence[N0 * NUM_DIGITS_GF2X_ELEMENT],
AES_XOF_struct *seed_expander_ctx);

void PQCLEAN_LEDAKEMLT12_CLEAN_gf2x_mod_add_sparse(
int sizeR, POSITION_T Res[],
int sizeA, const POSITION_T A[],
int sizeB, const POSITION_T B[]);

void PQCLEAN_LEDAKEMLT12_CLEAN_gf2x_transpose_in_place_sparse(
int sizeA,
POSITION_T A[]);

void PQCLEAN_LEDAKEMLT12_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_LEDAKEMLT12_CLEAN_gf2x_mod_mul_dense_to_sparse(
DIGIT Res[],
const DIGIT dense[],
POSITION_T sparse[],
unsigned int nPos);

static inline int partition(POSITION_T arr[], int lo, int hi) {
POSITION_T x = arr[hi];
POSITION_T tmp;
@@ -155,4 +114,16 @@ static inline void quicksort_sparse(POSITION_T Res[]) {
}
}

void PQCLEAN_LEDAKEMLT12_CLEAN_gf2x_mod_mul(DIGIT Res[], const DIGIT A[], const DIGIT B[]);
void PQCLEAN_LEDAKEMLT12_CLEAN_gf2x_transpose_in_place(DIGIT A[]);
void PQCLEAN_LEDAKEMLT12_CLEAN_rand_circulant_sparse_block(POSITION_T *pos_ones, int countOnes, AES_XOF_struct *seed_expander_ctx);
void PQCLEAN_LEDAKEMLT12_CLEAN_rand_circulant_blocks_sequence(DIGIT *sequence, AES_XOF_struct *seed_expander_ctx);
void PQCLEAN_LEDAKEMLT12_CLEAN_gf2x_mod_add_sparse(int sizeR, POSITION_T Res[], int sizeA, const POSITION_T A[], int sizeB, const POSITION_T B[]);
void PQCLEAN_LEDAKEMLT12_CLEAN_gf2x_transpose_in_place_sparse(int sizeA, POSITION_T A[]);
void PQCLEAN_LEDAKEMLT12_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_LEDAKEMLT12_CLEAN_gf2x_mod_mul_dense_to_sparse(DIGIT Res[], const DIGIT dense[], POSITION_T sparse[], unsigned int nPos);
void PQCLEAN_LEDAKEMLT12_CLEAN_gf2x_tobytes(uint8_t *bytes, const DIGIT *poly);

int PQCLEAN_LEDAKEMLT12_CLEAN_gf2x_mod_inverse(DIGIT out[], const DIGIT in[]);

#endif

+ 0
- 18
crypto_kem/ledakemlt12/clean/gf2x_limbs.h View File

@@ -1,18 +0,0 @@
#ifndef GF2X_LIMBS_H
#define GF2X_LIMBS_H

#include "qc_ldpc_parameters.h"

#include <inttypes.h>
#include <limits.h>
#include <stddef.h>

typedef uint64_t DIGIT;
#define DIGIT_IS_UINT64
#define DIGIT_IS_ULLONG
#define DIGIT_SIZE_B (8)
#define DIGIT_SIZE_b (DIGIT_SIZE_B << 3)

#define POSITION_T uint32_t

#endif

+ 5
- 12
crypto_kem/ledakemlt12/clean/kem.c View File

@@ -16,17 +16,10 @@ int PQCLEAN_LEDAKEMLT12_CLEAN_crypto_kem_keypair(unsigned char *pk, unsigned cha
return 0;
}

static void error_tobytes(uint8_t *error_bytes, const uint64_t *error_digits) {
size_t i, j, k;
uint64_t t;

static void pack_error(uint8_t *error_bytes, const DIGIT *error_digits) {
size_t i;
for (i = 0; i < N0; i++) {
for (j = 0; j < NUM_DIGITS_GF2X_ELEMENT; j++) {
t = error_digits[i * NUM_DIGITS_GF2X_ELEMENT + j];
for (k = 0; k < DIGIT_SIZE_B; k++) {
error_bytes[(i * NUM_DIGITS_GF2X_ELEMENT + j) * DIGIT_SIZE_B + k] = (uint8_t) ((t >> (8 * k)) & 0xFF);
}
}
PQCLEAN_LEDAKEMLT12_CLEAN_gf2x_tobytes(error_bytes + i * NUM_DIGITS_GF2X_ELEMENT * DIGIT_SIZE_B, error_digits + i * NUM_DIGITS_GF2X_ELEMENT);
}
}

@@ -41,7 +34,7 @@ int PQCLEAN_LEDAKEMLT12_CLEAN_crypto_kem_enc(unsigned char *ct, unsigned char *s
randombytes(encapsulated_key_seed, TRNG_BYTE_LENGTH);
PQCLEAN_LEDAKEMLT12_CLEAN_seedexpander_from_trng(&niederreiter_encap_key_expander, encapsulated_key_seed);
PQCLEAN_LEDAKEMLT12_CLEAN_rand_circulant_blocks_sequence(error_vector, &niederreiter_encap_key_expander);
error_tobytes(error_bytes, error_vector);
pack_error(error_bytes, error_vector);
HASH_FUNCTION(ss, error_bytes, (N0 * NUM_DIGITS_GF2X_ELEMENT * DIGIT_SIZE_B));
PQCLEAN_LEDAKEMLT12_CLEAN_niederreiter_encrypt((DIGIT *) ct, (publicKeyNiederreiter_t *) pk, error_vector);

@@ -56,7 +49,7 @@ int PQCLEAN_LEDAKEMLT12_CLEAN_crypto_kem_dec(unsigned char *ss, const unsigned c
uint8_t decoded_error_bytes[N0 * NUM_DIGITS_GF2X_ELEMENT * DIGIT_SIZE_B];

PQCLEAN_LEDAKEMLT12_CLEAN_niederreiter_decrypt(decoded_error_vector, (privateKeyNiederreiter_t *)sk, (DIGIT *)ct);
error_tobytes(decoded_error_bytes, decoded_error_vector);
pack_error(decoded_error_bytes, decoded_error_vector);
HASH_FUNCTION(ss, decoded_error_bytes, (N0 * NUM_DIGITS_GF2X_ELEMENT * DIGIT_SIZE_B));

return 0;


+ 15
- 32
crypto_kem/ledakemlt12/clean/niederreiter.c View File

@@ -8,9 +8,7 @@

#include <string.h>

void PQCLEAN_LEDAKEMLT12_CLEAN_niederreiter_keygen(publicKeyNiederreiter_t *pk,
privateKeyNiederreiter_t *sk,
AES_XOF_struct *keys_expander) {
void PQCLEAN_LEDAKEMLT12_CLEAN_niederreiter_keygen(publicKeyNiederreiter_t *pk, privateKeyNiederreiter_t *sk, AES_XOF_struct *keys_expander) {

// sequence of N0 circ block matrices (p x p): Hi
POSITION_T HPosOnes[N0][DV];
@@ -32,12 +30,8 @@ void PQCLEAN_LEDAKEMLT12_CLEAN_niederreiter_keygen(publicKeyNiederreiter_t *pk,
int isDFRok = 0;
sk->rejections = (int8_t) 0;
do {
PQCLEAN_LEDAKEMLT12_CLEAN_generateHPosOnes_HtrPosOnes(HPosOnes,
HtrPosOnes,
keys_expander);

PQCLEAN_LEDAKEMLT12_CLEAN_generateQsparse(QPosOnes,
keys_expander);
PQCLEAN_LEDAKEMLT12_CLEAN_generateHPosOnes_HtrPosOnes(HPosOnes, HtrPosOnes, keys_expander);
PQCLEAN_LEDAKEMLT12_CLEAN_generateQsparse(QPosOnes, keys_expander);
for (int i = 0; i < N0; i++) {
for (int j = 0; j < DV * M; j++) {
LPosOnes[i][j] = INVALID_POS_VALUE;
@@ -89,10 +83,7 @@ void PQCLEAN_LEDAKEMLT12_CLEAN_niederreiter_keygen(publicKeyNiederreiter_t *pk,
}


void PQCLEAN_LEDAKEMLT12_CLEAN_niederreiter_encrypt(DIGIT *syndrome, // 1 polynomial
const publicKeyNiederreiter_t *pk,
const DIGIT *err) { // N0 polynomials

void PQCLEAN_LEDAKEMLT12_CLEAN_niederreiter_encrypt(DIGIT *syndrome, const publicKeyNiederreiter_t *pk, const DIGIT *err) {
int i;
DIGIT saux[NUM_DIGITS_GF2X_ELEMENT];

@@ -101,21 +92,17 @@ void PQCLEAN_LEDAKEMLT12_CLEAN_niederreiter_encrypt(DIGIT *syndrome, // 1 polyn
for (i = 0; i < N0 - 1; i++) {
PQCLEAN_LEDAKEMLT12_CLEAN_gf2x_mod_mul(saux,
pk->Mtr + i * NUM_DIGITS_GF2X_ELEMENT,
err + i * NUM_DIGITS_GF2X_ELEMENT
);
err + i * NUM_DIGITS_GF2X_ELEMENT);
gf2x_mod_add(syndrome, syndrome, saux);
} // end for
gf2x_mod_add(syndrome, syndrome, err + (N0 - 1)*NUM_DIGITS_GF2X_ELEMENT);
}


int PQCLEAN_LEDAKEMLT12_CLEAN_niederreiter_decrypt(DIGIT *err, // N0 circ poly
const privateKeyNiederreiter_t *sk,
const DIGIT *syndrome) {
int PQCLEAN_LEDAKEMLT12_CLEAN_niederreiter_decrypt(DIGIT *err, const privateKeyNiederreiter_t *sk, const DIGIT *syndrome) {

AES_XOF_struct niederreiter_decrypt_expander;
PQCLEAN_LEDAKEMLT12_CLEAN_seedexpander_from_trng(&niederreiter_decrypt_expander,
sk->prng_seed);
PQCLEAN_LEDAKEMLT12_CLEAN_seedexpander_from_trng(&niederreiter_decrypt_expander, sk->prng_seed);

// sequence of N0 circ block matrices (p x p):
POSITION_T HPosOnes[N0][DV];
@@ -124,8 +111,7 @@ int PQCLEAN_LEDAKEMLT12_CLEAN_niederreiter_decrypt(DIGIT *err, // N0 circ poly
int rejections = sk->rejections;
POSITION_T LPosOnes[N0][DV * M];
do {
PQCLEAN_LEDAKEMLT12_CLEAN_generateHPosOnes_HtrPosOnes(HPosOnes, HtrPosOnes,
&niederreiter_decrypt_expander);
PQCLEAN_LEDAKEMLT12_CLEAN_generateHPosOnes_HtrPosOnes(HPosOnes, HtrPosOnes, &niederreiter_decrypt_expander);
PQCLEAN_LEDAKEMLT12_CLEAN_generateQsparse(QPosOnes, &niederreiter_decrypt_expander);
for (int i = 0; i < N0; i++) {
for (int j = 0; j < DV * M; j++) {
@@ -173,28 +159,25 @@ int PQCLEAN_LEDAKEMLT12_CLEAN_niederreiter_decrypt(DIGIT *err, // N0 circ poly

for (int i = 0; i < N0; i++) {
PQCLEAN_LEDAKEMLT12_CLEAN_gf2x_mod_mul_sparse(DV * M, auxSparse,
DV, HPosOnes[i],
qBlockWeights[i][N0 - 1], &QPosOnes[i][ M - qBlockWeights[i][N0 - 1] ]
);
DV, HPosOnes[i],
qBlockWeights[i][N0 - 1], &QPosOnes[i][ M - qBlockWeights[i][N0 - 1]]);
PQCLEAN_LEDAKEMLT12_CLEAN_gf2x_mod_add_sparse(DV * M, Ln0trSparse,
DV * M, Ln0trSparse,
DV * M, auxSparse
);
DV * M, auxSparse);
} // end for i

PQCLEAN_LEDAKEMLT12_CLEAN_gf2x_transpose_in_place_sparse(DV * M, Ln0trSparse);

DIGIT privateSyndrome[NUM_DIGITS_GF2X_ELEMENT];
PQCLEAN_LEDAKEMLT12_CLEAN_gf2x_mod_mul_dense_to_sparse(privateSyndrome,
syndrome,
Ln0trSparse,
DV * M);
PQCLEAN_LEDAKEMLT12_CLEAN_gf2x_mod_mul_dense_to_sparse(privateSyndrome, syndrome, Ln0trSparse, DV * M);

/* prepare mockup error vector in case a decoding failure occurs */
DIGIT mockup_error_vector[N0 * NUM_DIGITS_GF2X_ELEMENT];
memset(mockup_error_vector, 0x00, N0 * NUM_DIGITS_GF2X_ELEMENT * DIGIT_SIZE_B);
memcpy(mockup_error_vector, syndrome, NUM_DIGITS_GF2X_ELEMENT * DIGIT_SIZE_B);
PQCLEAN_LEDAKEMLT12_CLEAN_seedexpander(&niederreiter_decrypt_expander,
((unsigned char *) mockup_error_vector) + (NUM_DIGITS_GF2X_ELEMENT * DIGIT_SIZE_B), TRNG_BYTE_LENGTH);
((unsigned char *) mockup_error_vector) + (NUM_DIGITS_GF2X_ELEMENT * DIGIT_SIZE_B),
TRNG_BYTE_LENGTH);

int decryptOk = 0;
memset(err, 0x00, N0 * NUM_DIGITS_GF2X_ELEMENT * DIGIT_SIZE_B);


+ 3
- 18
crypto_kem/ledakemlt12/clean/niederreiter.h View File

@@ -2,7 +2,6 @@
#define NIEDERREITER_H

#include "gf2x_arith_mod_xPplusOne.h"
#include "gf2x_limbs.h"
#include "qc_ldpc_parameters.h"
#include "rng.h"

@@ -21,23 +20,9 @@ typedef struct {
// with P coefficients.
} publicKeyNiederreiter_t;



void PQCLEAN_LEDAKEMLT12_CLEAN_niederreiter_keygen(
publicKeyNiederreiter_t *pk,
privateKeyNiederreiter_t *sk,
AES_XOF_struct *keys_expander);

void PQCLEAN_LEDAKEMLT12_CLEAN_niederreiter_encrypt(
DIGIT syndrome[],
const publicKeyNiederreiter_t *pk,
const DIGIT *err);

// return 1 if everything is ok
int PQCLEAN_LEDAKEMLT12_CLEAN_niederreiter_decrypt(
DIGIT *err,
const privateKeyNiederreiter_t *sk,
const DIGIT *syndrome);
void PQCLEAN_LEDAKEMLT12_CLEAN_niederreiter_keygen(publicKeyNiederreiter_t *pk, privateKeyNiederreiter_t *sk, AES_XOF_struct *keys_expander);
void PQCLEAN_LEDAKEMLT12_CLEAN_niederreiter_encrypt(DIGIT syndrome[], const publicKeyNiederreiter_t *pk, const DIGIT *err);
int PQCLEAN_LEDAKEMLT12_CLEAN_niederreiter_decrypt(DIGIT *err, const privateKeyNiederreiter_t *sk, const DIGIT *syndrome);


#endif

+ 0
- 3
crypto_kem/ledakemlt12/clean/rng.h View File

@@ -17,10 +17,7 @@ typedef struct {
unsigned char ctr[16];
} AES_XOF_struct;


int PQCLEAN_LEDAKEMLT12_CLEAN_seedexpander(AES_XOF_struct *ctx, unsigned char *x, size_t xlen);

/* TRNG_BYTE_LENGTH wide buffer */
void PQCLEAN_LEDAKEMLT12_CLEAN_seedexpander_from_trng(AES_XOF_struct *ctx, const unsigned char *trng_entropy);

#endif

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