void calc(uint8_t *buf, int len, int binary, double *csq)
{
long ccount[256]; /* Bins to count occurrences of values */
long totalc = 0; /* Total character count */
double montepi=0, chip=0, scc=0, ent=0, mean=0, chisq=0;
memset(ccount, 0, sizeof ccount);
/* Initialise for calculations */
rt_init(binary);
/* Scan input file and count character occurrences */
for(int i=0; i < len; i++) {
unsigned char ocb = buf[i];
totalc += (binary ? 8 : 1);
if(binary) {
int b;
unsigned char ob = ocb;
for (b = 0; b < 8; b++) {
ccount[ob & 1]++;
ob >>= 1;
}
} else {
ccount[ocb]++;
}
rt_add(&ocb, 1);
}
VALUE rb_rt_read_string(VALUE self, VALUE rb_buf) {
rt_ctx *ctx;
Check_Type(rb_buf, T_STRING);
Data_Get_Struct(self, rt_ctx, ctx);
if(ctx->ended)
rb_raise(rb_eIOError, "data cannot be added after finalizing");
rt_add(ctx, RSTRING_PTR(rb_buf), RSTRING_LEN(rb_buf));
return LONG2NUM(RSTRING_LEN(rb_buf));
}
/**
* Run the entire unit test.
**/
int main(void)
{
int i;
int port;
guint16 real_port; /* port at its actual size (for randomtest) */
double ent, chisq, mean, montepi, scc; /* randomtest results */
printf("Testing source port randomness; iterations=%d, minimal entropy=%f\n", ITERATIONS, MIN_ENTROPY);
rt_init(FALSE); /* initialize randomtest, not binary */
/* run test iterations */
for (i = 0; i < ITERATIONS; i++)
{
port = try_bind_once();
#if PRINT_PORTS
printf("Port bound to: %d\n", port);
#endif
if (port < PORT_MIN)
{
printf("Failed: port number below minimum.\n");
exit(1);
}
if (port > PORT_MAX)
{
printf("Failed: port number above maximum.\n");
exit(1);
}
real_port = (guint16)port;
rt_add(&real_port, sizeof(real_port));
}
/* check randomness */
rt_end(&ent, &chisq, &mean, &montepi, &scc);
printf("Randomness: entropy=%f, chi-square=%f, mean=%f, monte-carlo-pi=%f, serial correlation=%f\n", ent, chisq, mean, montepi, scc);
/* make decision */
if (ent >= MIN_ENTROPY) {
printf("Passed: entropy is high enough.\n");
exit(0);
}
else
{
printf("Failed: entropy is not high enough.\n");
exit(1);
}
}
static void ipip_receive(void *argp)
{
int addrlen;
int hdr_len;
int l;
int32 ipaddr;
struct edv_t *edv;
struct iface *ifp;
struct ip *ipptr;
struct mbuf *bp;
struct sockaddr_in addr;
uint8 buf[MAX_FRAME];
uint8 *bufptr;
ifp = (struct iface *) argp;
edv = (struct edv_t *) ifp->edv;
addrlen = sizeof(addr);
l = recvfrom(edv->fd, (char *) (bufptr = buf), sizeof(buf), 0, (struct sockaddr *) &addr, &addrlen);
if (edv->type == USE_IP) {
if (l <= sizeof(struct ip)) goto Fail;
ipptr = (struct ip *) bufptr;
hdr_len = 4 * ipptr->ip_hl;
bufptr += hdr_len;
l -= hdr_len;
}
if (l <= 0) goto Fail;
if ((ipaddr = get32(bufptr + 12)) && ismyaddr(ipaddr) == NULL)
rt_add(ipaddr, 32, (int32) ntohl(addr.sin_addr.s_addr), ifp, 1L, 0x7fffffff / 1000, 0);
bp = qdata(bufptr, l);
net_route(ifp, &bp);
return;
Fail:
ifp->crcerrors++;
}
VALUE rb_rt_read_file(VALUE self, VALUE rb_filename) {
rt_ctx *ctx;
FILE *fp;
int oc;
size_t fsz = 0;
Check_Type(rb_filename, T_STRING);
Data_Get_Struct(self, rt_ctx, ctx);
if(ctx->ended)
rb_raise(rb_eIOError, "data cannot be added after finalizing");
if ((fp = fopen(RSTRING_PTR(rb_filename), "rb")) == NULL)
rb_sys_fail(0);
while((oc=fgetc(fp)) != EOF) {
unsigned char ocb = (unsigned char) oc;
rt_add(ctx, &ocb, 1);
fsz++;
}
fclose(fp);
return LONG2NUM(fsz);
}
int main(int argc, char *argv[]) {
if (!getenv("FORCE_PRNG_VERF")) {
fprintf(stderr,
"prng: Skipping PRNG verification test\n"
"prng: Set FORCE_PRNG_VERF=1 to enable PRNG verification\n");
return 77;
}
uint8_t ob[BUFFER_SIZE];
unsigned long totalc = 0; /* Total character count */
double montepi, chip, scc, ent, mean, chisq;
/* Initialise for calculations */
rt_init(0);
/* Scan input and count character occurrences */
for (totalc = 0; totalc < SAMPLE_SIZE_BYTES; totalc += BUFFER_SIZE) {
assert(prng_get_random_bytes(ob, BUFFER_SIZE) >= 0);
rt_add(ob, BUFFER_SIZE);
}
/* Complete calculation and return sequence metrics */
rt_end(&ent, &chisq, &mean, &montepi, &scc);
/* Calculate probability of observed distribution occurring from
the results of the Chi-Square test */
chip = pochisq(chisq, 255);
/* Print calculated results */
printf("Entropy:\n");
printf("========\n");
printf("Entropy = %f bits per byte.\n", ent);
printf("\nOptimum compression would reduce the size\n");
printf("of this %ld byte input by %d percent.\n\n", totalc,
(int16_t)(100 * (8 - ent) / 8.0));
// Optimum compression would reduction equal to 0%
assert((int16_t)(100 * (8 - ent) / 8.0) == 0);
printf("Chi-square Test:\n");
printf("================\n");
printf("Chi square distribution for %ld samples is %1.2f, and randomly\n",
totalc, chisq);
if (chip < 0.0001) {
printf(
"would exceed this value less than 0.01 percent of the times.\n\n");
} else if (chip > 0.9999) {
printf("would exceed this value more than than 99.99 percent of the "
"times.\n\n");
} else {
printf("would exceed this value %1.2f percent of the times.\n\n",
chip * 100);
}
// Chi-square test result between 10% and 90%
assert(90 > (chip * 100));
assert((chip * 100) > 10);
printf("Arithmetic Mean:\n");
printf("================\n");
printf("Arithmetic mean value of data bytes is %1.4f (%.1f = random).\n\n",
mean, 127.5);
// Arithmetic Mean between 127 and 128
assert(127.0 < mean);
assert(mean < 128.0);
printf("Monte Carlo Value for Pi:\n");
printf("=========================\n");
printf("Monte Carlo value for Pi is %1.9f (error %1.2f percent).\n\n",
montepi, 100.0 * (fabs(PI - montepi) / PI));
// Monte Carlo Value for Pi less than 0.5
assert(0.5 > 100.0 * (fabs(PI - montepi) / PI));
printf("Serial Correlation Coefficient:\n");
printf("===============================\n");
printf("Serial correlation coefficient is ");
if (scc >= -99999) {
printf("%1.6f (totally uncorrelated = 0.0).\n", scc);
} else {
printf("undefined (all values equal!).\n");
}
printf("\nSee https://www.fourmilab.ch/random/ for detailed description of "
"output\n");
// Serial Correlation Coefficient between -0.005 and 0.005
assert(0.005 > scc);
assert(scc > -0.005);
return 0;
}
int main(int argc, char *argv[])
{
int i, oc, opt;
long ccount[256]; /* Bins to count occurrences of values */
long totalc = 0; /* Total character count */
char *samp;
double a, montepi, chip,
scc, ent, mean, chisq;
FILE *fp = stdin;
int counts = FALSE, /* Print character counts */
fold = FALSE, /* Fold upper to lower */
binary = FALSE, /* Treat input as a bitstream */
terse = FALSE; /* Terse (CSV format) output */
while ((opt = getopt(argc, argv, "bcftu?hBCFTUH")) != -1) {
switch (toISOlower(opt)) {
case 'b':
binary = TRUE;
break;
case 'c':
counts = TRUE;
break;
case 'f':
fold = TRUE;
break;
case 't':
terse = TRUE;
break;
case '?':
case 'u':
case 'h':
help();
return 0;
}
}
if (optind < argc) {
if (optind != (argc - 1)) {
V printf("Duplicate file name.\n");
help();
return 2;
}
if ((fp = fopen(argv[optind], "rb")) == NULL) {
V printf("Cannot open file %s\n", argv[optind]);
return 2;
}
}
samp = binary ? "bit" : "byte";
memset(ccount, 0, sizeof ccount);
/* Initialise for calculations */
rt_init(binary);
/* Scan input file and count character occurrences */
while ((oc = fgetc(fp)) != EOF) {
unsigned char ocb;
if (fold && isISOalpha(oc) && isISOupper(oc)) {
oc = toISOlower(oc);
}
ocb = (unsigned char) oc;
totalc += binary ? 8 : 1;
if (binary) {
int b;
unsigned char ob = ocb;
for (b = 0; b < 8; b++) {
ccount[ob & 1]++;
ob >>= 1;
}
} else {
ccount[ocb]++; /* Update counter for this bin */
}
rt_add(&ocb, 1);
}