21 lines
587 B
C
21 lines
587 B
C
|
#include "gf2x_arith.h"
|
||
|
|
#include "utils.h"
|
||
|
|
|
||
|
|
/* compares DIGIT sequences, returns 0 if they are equal */
|
||
|
|
int PQCLEAN_LEDAKEMLT52_LEAKTIME_gf2x_verify(const DIGIT *a, const DIGIT *b, size_t len) {
|
||
|
|
DIGIT x = 0;
|
||
|
|
for (size_t i = 0; i < len; i++) {
|
||
|
|
x |= a[i] ^ b[i];
|
||
|
|
}
|
||
|
|
x = (-x) >> (DIGIT_SIZE_b - 1);
|
||
|
|
return (int)x;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* conditionally move a into r if cond */
|
||
|
|
void PQCLEAN_LEDAKEMLT52_LEAKTIME_cmov(uint8_t *r, const uint8_t *a, size_t len, int cond) {
|
||
|
|
uint8_t mask = -cond;
|
||
|
|
for (size_t i = 0; i < len; i++) {
|
||
|
|
r[i] ^= mask & (r[i] ^ a[i]);
|
||
|
|
}
|
||
|
|
}
|