mirror of
https://github.com/henrydcase/pqc.git
synced 2024-11-26 17:31:38 +00:00
22 lines
610 B
C
22 lines
610 B
C
#include "gf2x_arith.h"
|
|
#include "utils.h"
|
|
|
|
/* compares DIGIT sequences, returns 0 if they are equal */
|
|
int PQCLEAN_LEDAKEMLT12_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) + 1;
|
|
x >>= (DIGIT_SIZE_b - 1);
|
|
return (int)x;
|
|
}
|
|
|
|
/* conditionally move a into r if cond */
|
|
void PQCLEAN_LEDAKEMLT12_LEAKTIME_cmov(uint8_t *r, const uint8_t *a, size_t len, int cond) {
|
|
uint8_t mask = (uint8_t)(-cond);
|
|
for (size_t i = 0; i < len; i++) {
|
|
r[i] ^= mask & (r[i] ^ a[i]);
|
|
}
|
|
}
|