cc83d5197c
We only use this when we don't require the best randomness. The primary usecase for this is UUID generation, as this means we don't drain randomness from the kernel pool for them. Since UUIDs are usually not secrets RDRAND should be goot enough for them to avoid real-life collisions.
68 lines
1.6 KiB
C
68 lines
1.6 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
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#include "hexdecoct.h"
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#include "random-util.h"
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#include "log.h"
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#include "tests.h"
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static void test_genuine_random_bytes(RandomFlags flags) {
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uint8_t buf[16] = {};
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unsigned i;
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log_info("/* %s */", __func__);
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for (i = 1; i < sizeof buf; i++) {
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assert_se(genuine_random_bytes(buf, i, flags) == 0);
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if (i + 1 < sizeof buf)
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assert_se(buf[i] == 0);
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hexdump(stdout, buf, i);
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}
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}
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static void test_pseudo_random_bytes(void) {
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uint8_t buf[16] = {};
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unsigned i;
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log_info("/* %s */", __func__);
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for (i = 1; i < sizeof buf; i++) {
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pseudo_random_bytes(buf, i);
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if (i + 1 < sizeof buf)
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assert_se(buf[i] == 0);
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hexdump(stdout, buf, i);
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}
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}
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static void test_rdrand64(void) {
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int r, i;
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for (i = 0; i < 10; i++) {
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uint64_t x = 0;
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r = rdrand64(&x);
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if (r < 0) {
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log_error_errno(r, "RDRAND failed: %m");
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return;
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}
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printf("%" PRIx64 "\n", x);
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}
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}
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int main(int argc, char **argv) {
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test_setup_logging(LOG_DEBUG);
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test_genuine_random_bytes(RANDOM_EXTEND_WITH_PSEUDO);
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test_genuine_random_bytes(0);
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test_genuine_random_bytes(RANDOM_BLOCK);
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test_genuine_random_bytes(RANDOM_ALLOW_RDRAND);
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test_pseudo_random_bytes();
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test_rdrand64();
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return 0;
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}
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