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#define _GNU_SOURCE
#include <stdio.h>
#include <string.h>
#include <stdint.h>
#include <math.h>
extern void curve25519_donna(uint8_t *, const uint8_t *, const uint8_t *);
extern uint64_t tsc_read();
int
main(int argc, char **argv) {
uint8_t private_key[32], public[32], peer1[32], peer2[32], output[32];
static const uint8_t basepoint[32] = {9};
unsigned i;
uint64_t sum = 0, sum_squares = 0, skipped = 0, mean;
static const unsigned count = 200000;
memset(private_key, 42, sizeof(private_key));
private_key[0] &= 248;
private_key[31] &= 127;
private_key[31] |= 64;
curve25519_donna(public, private_key, basepoint);
memset(peer1, 0, sizeof(peer1));
memset(peer2, 255, sizeof(peer2));
for (i = 0; i < count; ++i) {
const uint64_t start = tsc_read();
curve25519_donna(output, peer1, public);
const uint64_t end = tsc_read();
const uint64_t delta = end - start;
if (delta > 650000) {
// something terrible happened (task switch etc)
skipped++;
continue;
}
sum += delta;
sum_squares += (delta * delta);
}
mean = sum / ((uint64_t) count);
printf("all 0: mean:%lu sd:%f skipped:%lu\n",
mean,
sqrt((double)(sum_squares/((uint64_t) count) - mean*mean)),
skipped);
sum = sum_squares = skipped = 0;
for (i = 0; i < count; ++i) {
const uint64_t start = tsc_read();
curve25519_donna(output, peer2, public);
const uint64_t end = tsc_read();
const uint64_t delta = end - start;
if (delta > 650000) {
// something terrible happened (task switch etc)
skipped++;
continue;
}
sum += delta;
sum_squares += (delta * delta);
}
mean = sum / ((uint64_t) count);
printf("all 1: mean:%lu sd:%f skipped:%lu\n",
mean,
sqrt((double)(sum_squares/((uint64_t) count) - mean*mean)),
skipped);
return 0;
}
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