mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-01-31 19:43:32 +00:00
67 lines
3.2 KiB
C
67 lines
3.2 KiB
C
/*-*- 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 "libc/intrin/bits.h"
|
|
#include "libc/stdio/rand.h"
|
|
#include "libc/testlib/testlib.h"
|
|
|
|
uint64_t counter(void) {
|
|
static uint8_t t;
|
|
return 0x0101010101010101ull * t++;
|
|
}
|
|
|
|
TEST(rngset, testZeroReseedInterval_doesntApplyPrng) {
|
|
char buf[32];
|
|
EXPECT_EQ(buf, rngset(buf, sizeof(buf), counter, 0));
|
|
EXPECT_EQ(0x0000000000000000, READ64LE(buf + 0));
|
|
EXPECT_EQ(0x0101010101010101, READ64LE(buf + 8));
|
|
EXPECT_EQ(0x0202020202020202, READ64LE(buf + 16));
|
|
EXPECT_EQ(0x0303030303030303, READ64LE(buf + 24));
|
|
}
|
|
|
|
uint64_t eleet(void) {
|
|
return 0x31337;
|
|
}
|
|
|
|
TEST(rngset, testReseedIsNeg_usesInternalVignaPrng) {
|
|
char buf[32];
|
|
svigna(0x31337);
|
|
EXPECT_EQ(buf, rngset(buf, sizeof(buf), eleet, -1));
|
|
EXPECT_EQ(vigna(), READ64LE(buf + 0));
|
|
EXPECT_EQ(vigna(), READ64LE(buf + 8));
|
|
EXPECT_EQ(vigna(), READ64LE(buf + 16));
|
|
EXPECT_EQ(vigna(), READ64LE(buf + 24));
|
|
}
|
|
|
|
TEST(rngset, testNullSeedFunction_reseedBecomesVignaSeed) {
|
|
char buf[32];
|
|
svigna(123);
|
|
EXPECT_EQ(buf, rngset(buf, sizeof(buf), 0, 123));
|
|
EXPECT_EQ(vigna(), READ64LE(buf + 0));
|
|
EXPECT_EQ(vigna(), READ64LE(buf + 8));
|
|
EXPECT_EQ(vigna(), READ64LE(buf + 16));
|
|
EXPECT_EQ(vigna(), READ64LE(buf + 24));
|
|
}
|
|
|
|
TEST(rngset, testWeirdlyShaped_doesntCrash) {
|
|
char buf[7];
|
|
rngset(buf, sizeof(buf), 0, 0);
|
|
rngset(buf, sizeof(buf), vigna, 0);
|
|
rngset(buf, sizeof(buf), vigna, 9);
|
|
rngset(buf, sizeof(buf), vigna, 8);
|
|
}
|