static struct crypt *setup_cipher(int type, int id, int mac)
{
struct cipher_list *c;
int klen = 20;
void *key;
struct crypt_sym *cs;
struct crypt *ci;
c = crypt_find_cipher(type, id);
if (!c)
errx(1, "Can't find cipher %d (type %d)", id, type);
cs = crypt_new(c->c_ctr);
if (mac)
ci = cs->cs_mac;
else
ci = cs->cs_cipher;
key = alloca(klen);
assert(key);
memset(key, 0, klen);
crypt_set_key(ci, key, klen);
/* XXX cs is leaked */
return ci;
}
static int hkdf_set_key(struct crypt *c, void *data, int len)
{
struct hkdf_priv *hk = crypt_priv(c);
crypt_set_key(hk->hk_hmac, data, len);
return 0;
}
int main(void) {
int i, j;
struct timeval then, now;
suseconds_t totalHash = 0;
suseconds_t totalAes = 0;
FILE *opf;
crypt_context_t context;
char readings[MSG_LEN + 1];
char hashBuff[32];
char encBuff[32];
opf = fopen("data.out", "w");
srand(time(NULL));
crypt_initialise(&context);
/* For test purposes, the key is left wide open here */
crypt_set_key(&context, "abcdefghijklmnopqrstuvwxyz012345");
for(i = 0; i < MSG_LEN; i++)
readings[i] = 0;
for(i = 0; i < ITERS; i++) {
/* Generate data randomly (since there's nothing connected on RPi to probe */
sprintf(&readings[0], "%04x", rand() & 0xffff);
sprintf(&readings[4], "%04x", rand() & 0xffff);
sprintf(&readings[8], "%04x", rand() & 0xffff);
sprintf(&readings[12], "%04x", rand() & 0xffff);
sprintf(&readings[16], "%04x", rand() & 0xffff);
sprintf(&readings[20], "%04x", rand() & 0xffff);
sprintf(&readings[24], "%04x", rand() & 0xffff);
sprintf(&readings[28], "%04x", rand() & 0xffff);
//sprintf(readings, "abcdefghijklmnopqrstuvwxyz012345");
/* Digest data */
gettimeofday(&then, NULL);
crypt_digest(&context, readings, MSG_LEN, hashBuff);
gettimeofday(&now, NULL);
totalHash += (now.tv_usec - then.tv_usec);
/* Cipher digest */
gettimeofday(&then, NULL);
crypt_aes_enc(&context, hashBuff, encBuff, 32, "0123456789abcdef");
gettimeofday(&now, NULL);
totalAes += (now.tv_usec - then.tv_usec);
/* Save findings to file */
fprintf(opf, "%s\n", readings);
for(j = 0; j < 32; j++)
fprintf(opf, "%02x", hashBuff[j] & 0xff);
fprintf(opf, "\n");
for(j = 0; j < 32; j++)
fprintf(opf, "%02x", encBuff[j] & 0xff);
fprintf(opf, "\n");
}
/* Print statistics */
printf("Done. Elapsed hash time: %ld us\n", totalHash);
printf("Done. Elapsed hash time per iter: %ld us\n", totalHash / ITERS);
printf("Done. Elapsed cipher time: %ld us\n", totalAes);
printf("Done. Elapsed total time: %ld us\n", totalHash + totalAes);
crypt_terminate(&context);
fclose(opf);
return 0;
}
