1 files changed, 67 insertions, 0 deletions
diff --git a/src/test/test-random-util.c b/src/test/test-random-util.c
new file mode 100644
index 0000000..94c431f
--- /dev/null
+++ b/src/test/test-random-util.c
@@ -0,0 +1,67 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
+
+#include "hexdecoct.h"
+#include "random-util.h"
+#include "log.h"
+#include "tests.h"
+
+static void test_genuine_random_bytes(RandomFlags flags) {
+        uint8_t buf[16] = {};
+        unsigned i;
+
+        log_info("/* %s */", __func__);
+
+        for (i = 1; i < sizeof buf; i++) {
+                assert_se(genuine_random_bytes(buf, i, flags) == 0);
+                if (i + 1 < sizeof buf)
+                        assert_se(buf[i] == 0);
+
+                hexdump(stdout, buf, i);
+        }
+}
+
+static void test_pseudo_random_bytes(void) {
+        uint8_t buf[16] = {};
+        unsigned i;
+
+        log_info("/* %s */", __func__);
+
+        for (i = 1; i < sizeof buf; i++) {
+                pseudo_random_bytes(buf, i);
+                if (i + 1 < sizeof buf)
+                        assert_se(buf[i] == 0);
+
+                hexdump(stdout, buf, i);
+        }
+}
+
+static void test_rdrand(void) {
+        int r, i;
+
+        for (i = 0; i < 10; i++) {
+                unsigned long x = 0;
+
+                r = rdrand(&x);
+                if (r < 0) {
+                        log_error_errno(r, "RDRAND failed: %m");
+                        return;
+                }
+
+                printf("%lx\n", x);
+        }
+}
+
+int main(int argc, char **argv) {
+        test_setup_logging(LOG_DEBUG);
+
+        test_genuine_random_bytes(RANDOM_EXTEND_WITH_PSEUDO);
+        test_genuine_random_bytes(0);
+        test_genuine_random_bytes(RANDOM_BLOCK);
+        test_genuine_random_bytes(RANDOM_ALLOW_RDRAND);
+
+        test_pseudo_random_bytes();
+
+        test_rdrand();
+
+        return 0;
+}