int
main(int argc, char **argv)
{
int idx = 0;
char *buffer;
char path[MAXPATHLEN];
setprogname(argv[0]);
if(getarg(args, sizeof(args) / sizeof(args[0]), argc, argv, &idx))
usage(1);
if (help_flag)
usage(0);
if(version_flag){
print_version(NULL);
exit(0);
}
argc -= idx;
argv += idx;
if (argc != 0)
usage(1);
buffer = emalloc(len);
if (rand_method) {
if (0) {
}
#ifndef NO_RAND_FORTUNA_METHOD
else if (strcasecmp(rand_method, "fortuna") == 0)
RAND_set_rand_method(RAND_fortuna_method());
#endif
#ifndef NO_RAND_UNIX_METHOD
else if (strcasecmp(rand_method, "unix") == 0)
RAND_set_rand_method(RAND_unix_method());
#endif
#ifndef NO_RAND_EGD_METHOD
else if (strcasecmp(rand_method, "egd") == 0)
RAND_set_rand_method(RAND_egd_method());
#endif
#ifdef WIN32
else if (strcasecmp(rand_method, "w32crypto") == 0)
RAND_set_rand_method(RAND_w32crypto_method());
#endif
else
errx(1, "unknown method %s", rand_method);
}
if (RAND_file_name(path, sizeof(path)) == NULL)
errx(1, "RAND_file_name failed");
if (RAND_status() != 1)
errx(1, "random not ready yet");
if (RAND_bytes(buffer, len) != 1)
errx(1, "RAND_bytes");
if (filename)
rk_dumpdata(filename, buffer, len);
/* head vs tail */
if (len >= 100000) {
int bit, i;
double res;
int bits[8] = { 0, 0, 0, 0, 0, 0, 0, 0 };
for (i = 0; i < len; i++) {
unsigned char c = ((unsigned char *)buffer)[i];
for (bit = 0; bit < 8 && c; bit++) {
if (c & 1)
bits[bit]++;
c = c >> 1;
}
}
for (bit = 0; bit < 8; bit++) {
res = ((double)abs(len - bits[bit] * 2)) / (double)len;
if (res > 0.005)
errx(1, "head%d vs tail%d > 0.5%%%% %lf == %d vs %d",
bit, bit, res, len, bits[bit]);
printf("head vs tails bit%d: %lf\n", bit, res);
}
}
int
main(int argc, char **argv)
{
int idx = 0;
char *buffer;
char path[MAXPATHLEN];
setprogname(argv[0]);
if(getarg(args, sizeof(args) / sizeof(args[0]), argc, argv, &idx))
usage(1);
if (help_flag)
usage(0);
if(version_flag){
print_version(NULL);
exit(0);
}
if (argc != idx)
usage(1);
buffer = emalloc(len);
if (rand_method) {
if (0) {
}
#ifndef NO_RAND_FORTUNA_METHOD
else if (strcasecmp(rand_method, "fortuna") == 0)
RAND_set_rand_method(RAND_fortuna_method());
#endif
#ifndef NO_RAND_UNIX_METHOD
else if (strcasecmp(rand_method, "unix") == 0)
RAND_set_rand_method(RAND_unix_method());
#endif
#ifdef WIN32
else if (strcasecmp(rand_method, "w32crypto") == 0)
RAND_set_rand_method(RAND_w32crypto_method());
#endif
else
errx(1, "unknown method %s", rand_method);
}
if (RAND_file_name(path, sizeof(path)) == NULL)
errx(1, "RAND_file_name failed");
if (RAND_status() != 1)
errx(1, "random not ready yet");
if (RAND_bytes(buffer, len) != 1)
errx(1, "RAND_bytes");
if (filename)
rk_dumpdata(filename, buffer, len);
/* head vs tail */
if (len >= 100000) {
unsigned bytes[256];
unsigned bits[8];
size_t bit, i;
double res;
double slen = sqrt((double)len);
memset(bits, 0, sizeof(bits));
memset(bytes, 0, sizeof(bytes));
for (i = 0; i < len; i++) {
unsigned char c = ((unsigned char *)buffer)[i];
bytes[c]++;
for (bit = 0; bit < 8 && c; bit++) {
if (c & 1)
bits[bit]++;
c = c >> 1;
}
}
/*
* The count for each bit value has a mean of n*p = len/2,
* and a standard deviation of sqrt(n*p*q) ~ sqrt(len/4).
* Normalizing by dividing by "n*p", we get a mean of 1 and
* a standard deviation of sqrt(q/n*p) = 1/sqrt(len).
*
* A 5.33-sigma event happens 1 time in 10 million.
* A 5.73-sigma event happens 1 time in 100 million.
* A 6.11-sigma event happens 1 time in 1000 million.
*
* We tolerate 5.33-sigma events (we have 8 not entirely
* independent chances of skewed results) and want to fail
* with a good RNG less often than 1 time in million.
*/
for (bit = 0; bit < 8; bit++) {
res = slen * fabs(1.0 - 2 * (double)bits[bit] / len);
if (res > 5.33)
errx(1, "head%d vs tail%d: %.1f-sigma (%d of %d)",
(int)bit, (int)bit, res, bits[bit], len);
printf("head vs tails bit%d: %f-sigma\n", (int)bit, res);
}
/*
* The count of each byte value has a mean of n*p = len/256,
* and a standard deviation of sqrt(n*p*q) ~ sqrt(len/256).
* Normalizing by dividing by "n*p", we get a mean of 1 and
* a standard deviation of sqrt(q/n*p) ~ 16/sqrt(len).
*
* We tolerate 5.73-sigma events (we have 256 not entirely
* independent chances of skewed results). Note, for example,
* a 5.2-sigma event was observed in ~5,000 runs.
*/
for (i = 0; i < 256; i++) {
res = (slen / 16) * fabs(1.0 - 256 * (double)bytes[i] / len);
if (res > 5.73)
errx(1, "byte %d: %.1f-sigma (%d of %d)",
(int) i, res, bytes[i], len);
printf("byte %d: %f-sigma\n", (int)i, res);
}
}