/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2021 Justine Alexandra Roberts Tunney │
│ │
│ Permission to use, copy, modify, and/or distribute this software for │
│ any purpose with or without fee is hereby granted, provided that the │
│ above copyright notice and this permission notice appear in all copies. │
│ │
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "ape/sections.internal.h"
#include "libc/atomic.h"
#include "libc/calls/calls.h"
#include "libc/calls/struct/sigaction.h"
#include "libc/calls/struct/sigset.h"
#include "libc/errno.h"
#include "libc/intrin/bits.h"
#include "libc/log/check.h"
#include "libc/macros.internal.h"
#include "libc/math.h"
#include "libc/mem/gc.h"
#include "libc/mem/mem.h"
#include "libc/nexgen32e/x86feature.h"
#include "libc/runtime/runtime.h"
#include "libc/stdio/lcg.internal.h"
#include "libc/stdio/rand.h"
#include "libc/stdio/stdio.h"
#include "libc/str/str.h"
#include "libc/str/tab.internal.h"
#include "libc/sysv/consts/grnd.h"
#include "libc/sysv/consts/sig.h"
#include "libc/testlib/ezbench.h"
#include "libc/testlib/hyperion.h"
#include "libc/testlib/testlib.h"
#include "libc/thread/thread.h"
#ifndef __aarch64__
// TODO(jart): Make this test less CPU intensive.
atomic_int done;
atomic_int ready;
pthread_t parent;
atomic_int gotsome;
void OnSig(int sig) {
++gotsome;
}
void *TortureWorker(void *arg) {
sigset_t ss;
sigfillset(&ss);
ASSERT_SYS(0, 0, sigprocmask(SIG_SETMASK, &ss, 0));
ready = true;
while (!done) {
if (!IsWindows()) pthread_kill(parent, SIGUSR1);
usleep(1);
if (!IsWindows()) pthread_kill(parent, SIGUSR2);
usleep(1);
}
return 0;
}
TEST(getrandom, test) {
int i, n = 999;
double e, w = 7.7;
char *buf = _gc(calloc(1, n));
ASSERT_SYS(0, 0, getrandom(0, 0, 0));
ASSERT_SYS(0, n, getrandom(buf, n, 0));
ASSERT_SYS(EFAULT, -1, getrandom(0, n, 0));
ASSERT_SYS(EINVAL, -1, getrandom(buf, n, -1));
if ((e = MeasureEntropy(buf, n)) < w) {
fprintf(stderr, "error: entropy is suspect! got %g but want >=%g\n", e, w);
for (i = 0; i < n;) {
if (!(i % 16)) fprintf(stderr, "%6x ", i);
fprintf(stderr, "%lc", kCp437[buf[i] & 255]);
if (!(++i % 16)) fprintf(stderr, "\n");
}
fprintf(stderr, "\n");
exit(1);
}
}
TEST(getrandom, test2) {
pthread_t child;
double e, w = 7.7;
struct sigaction sa;
int i, k, m, n = 999;
char *buf = _gc(calloc(1, n));
sa.sa_flags = 0;
sa.sa_handler = OnSig;
sigemptyset(&sa.sa_mask);
ASSERT_SYS(0, 0, sigaction(SIGUSR1, &sa, 0));
ASSERT_SYS(0, 0, sigaction(SIGUSR2, &sa, 0));
parent = pthread_self();
ASSERT_EQ(0, pthread_create(&child, 0, TortureWorker, 0));
while (!ready) pthread_yield();
for (k = 0; k < 10; ++k) {
ASSERT_SYS(0, 0, getrandom(0, 0, 0));
for (i = 0; i < n; i += m) {
ASSERT_NE(-1, (m = getrandom(buf + i, n - i, 0)));
}
ASSERT_SYS(EFAULT, -1, getrandom(0, n, 0));
ASSERT_SYS(EINVAL, -1, getrandom(buf, n, -1));
if ((e = MeasureEntropy(buf, n)) < w) {
fprintf(stderr, "error: entropy suspect! got %g but want >=%g\n", e, w);
for (i = 0; i < n;) {
if (!(i % 16)) fprintf(stderr, "%6x ", i);
fprintf(stderr, "%lc", kCp437[buf[i] & 255]);
if (!(++i % 16)) fprintf(stderr, "\n");
}
fprintf(stderr, "\n");
done = true;
pthread_join(child, 0);
exit(1);
}
}
done = true;
ASSERT_EQ(0, pthread_join(child, 0));
if (!IsWindows()) ASSERT_GT(gotsome, 0);
}
/* JustReturnZero */
/* entropy: 0 */
/* chi-square: 2.55e+07 */
/* chi-square percent: 0 */
/* mean: 0 */
/* monte-carlo-pi: 27.324 */
/* serial-correlation: -100000 */
/* JustIncrement */
/* entropy: 2.63951 */
/* chi-square: 1.443e+07 */
/* chi-square percent: 0 */
/* mean: 18.8803 */
/* monte-carlo-pi: 27.324 */
/* serial-correlation: 0.0092003 */
/* UNIX Sixth Edition */
/* entropy: 8 */
/* chi-square: 0.1536 */
/* chi-square percent: 1 */
/* mean: 127.502 */
/* monte-carlo-pi: 3.4192 */
/* serial-correlation: -0.470645 */
/* UNIX Seventh Edition */
/* entropy: 7.99818 */
/* chi-square: 251.843 */
/* chi-square percent: 0.544128 */
/* mean: 127.955 */
/* monte-carlo-pi: 0.675703 */
/* serial-correlation: -0.00207669 */
/* KnuthLcg */
/* entropy: 7.99835 */
/* chi-square: 228.383 */
/* chi-square percent: 0.883476 */
/* mean: 127.1 */
/* monte-carlo-pi: 0.561935 */
/* serial-correlation: -0.0038954 */
/* rand64 */
/* entropy: 7.99832 */
/* chi-square: 233.267 */
/* chi-square percent: 0.831821 */
/* mean: 127.427 */
/* monte-carlo-pi: 0.0271532 */
/* serial-correlation: -0.00255319 */
/* Rand64LowByte */
/* entropy: 7.99798 */
/* chi-square: 278.344 */
/* chi-square percent: 0.150796 */
/* mean: 127.88 */
/* monte-carlo-pi: 0.00340573 */
/* serial-correlation: 0.00162231 */
/* GetRandomNoSystem */
/* entropy: 7.99819 */
/* chi-square: 249.743 */
/* chi-square percent: 0.58114 */
/* mean: 127.124 */
/* monte-carlo-pi: 0.293716 */
/* serial-correlation: 0.00198516 */
/* GetRandomNoRdrrnd */
/* entropy: 7.99816 */
/* chi-square: 254.797 */
/* chi-square percent: 0.491811 */
/* mean: 127.308 */
/* monte-carlo-pi: 0.0118738 */
/* serial-correlation: 0.000197669 */
/* GetRandom */
/* entropy: 7.99808 */
/* chi-square: 266.737 */
/* chi-square percent: 0.294131 */
/* mean: 127.178 */
/* monte-carlo-pi: 0.0577122 */
/* serial-correlation: 0.00598793 */
typedef uint64_t (*random_f)(void);
static uint32_t randx = 1;
uint64_t JustReturnZero(void) {
return 0;
}
uint64_t JustIncrement(void) {
static uint64_t x;
return x++;
}
uint16_t SixthEditionRand(void) {
static int16_t gorp;
gorp = (gorp + 625) & 077777;
return gorp;
}
uint64_t SixthEditionLowByte(void) {
unsigned i;
uint64_t x;
for (x = i = 0; i < 8; ++i) {
x <<= 8;
x |= SixthEditionRand() & 255;
}
return x;
}
uint64_t MobyDick(void) {
static int i;
if ((i += 8) > kMobySize) i = 8;
return READ64LE(kMoby + i);
}
uint64_t ExecutableImage(void) {
static int i;
if ((i += 8) > _end - __executable_start) i = 8;
return READ64LE(__executable_start + i);
}
uint32_t SeventhEditionRand(void) {
return ((randx = randx * 1103515245 + 12345) >> 16) & 077777;
}
uint64_t SeventhEditionLowByte(void) {
unsigned i;
uint64_t x;
for (x = i = 0; i < 8; ++i) {
x <<= 8;
x |= SeventhEditionRand() & 255;
}
return x;
}
uint64_t KnuthLcg(void) {
unsigned i;
uint64_t x;
for (x = i = 0; i < 8; ++i) {
x <<= 8;
x |= rand() & 255;
}
return x;
}
uint64_t Rand64LowByte(void) {
unsigned i;
uint64_t x;
for (x = i = 0; i < 8; ++i) {
x <<= 8;
x |= _rand64() & 255;
}
return x;
}
uint64_t GetRandom(void) {
uint64_t x;
ASSERT_EQ(8, getrandom(&x, 8, 0));
return x;
}
static const struct RandomFunction {
const char *s;
random_f f;
bool r;
} kRandomFunctions[] = {
{"JustReturnZero", JustReturnZero, false}, //
{"JustIncrement", JustIncrement, false}, //
{"MobyDick", MobyDick, false}, //
{"ExecutableImage", ExecutableImage, false}, //
{"SixthEditionLowByte", SixthEditionLowByte, false}, //
{"SeventhEditionLowByte", SeventhEditionLowByte, false}, //
{"KnuthLcg", KnuthLcg, false}, //
{"rand64", _rand64, true}, //
{"Rand64LowByte", Rand64LowByte, true}, //
{"GetRandom", GetRandom, true}, //
};
TEST(getrandom, sanityTest) {
uint64_t q;
size_t i, j, k;
double montepi, scc, mean, chisq, ent;
for (k = 0; k < 1; ++k) {
for (j = 0; j < ARRAYLEN(kRandomFunctions); ++j) {
rt_init(0);
for (i = 0; i + 8 <= 100000; i += 8) {
q = kRandomFunctions[j].f();
rt_add(&q, 8);
}
rt_end(&ent, &chisq, &mean, &montepi, &scc);
#if 0
double chip = pochisq(chisq, 255);
fprintf(stderr, "\n");
fprintf(stderr, "/* %-32s */\n", kRandomFunctions[j].s);
fprintf(stderr, "/* entropy: %-12g */\n", ent);
fprintf(stderr, "/* chi-square: %-12g */\n", chisq);
fprintf(stderr, "/* chi-square percent: %-12g */\n", chip);
fprintf(stderr, "/* mean: %-12g */\n", mean);
fprintf(stderr, "/* monte-carlo-pi: %-12g */\n",
100 * fabs(M_PI - montepi) / M_PI);
fprintf(stderr, "/* serial-correlation: %-12g */\n", scc);
#endif
if (kRandomFunctions[j].r) {
CHECK_GT(chisq, 100, "%s", kRandomFunctions[j].s);
CHECK_LT(chisq, 400, "%s", kRandomFunctions[j].s);
CHECK_GE(ent * 10, 78, "%s", kRandomFunctions[j].s);
CHECK_LT(fabs(scc) * 100, 5, "%s", kRandomFunctions[j].s);
CHECK_LT(fabs(128 - mean), 3, "%s", kRandomFunctions[j].s);
}
}
}
}
TEST(getrandom, badflags_einval) {
ASSERT_SYS(EINVAL, -1, getrandom(0, 0, -1));
}
#endif /* __aarch64__ */