test: siphash24 - add regression test

.gitignore

@@ -249,6 +249,7 @@
 /test-sched-prio
 /test-set
 /test-sigbus
+/test-siphash24
 /test-sleep
 /test-socket-util
 /test-ssd

Makefile.am

@@ -1396,6 +1396,7 @@ tests += \
 	test-path \
 	test-path-util \
 	test-strxcpyx \
+	test-siphash24 \
 	test-unit-name \
 	test-unit-file \
 	test-utf8 \
@@ -2010,6 +2011,12 @@ test_execute_CFLAGS = \
 test_execute_LDADD = \
 	libcore.la
 
+test_siphash24_SOURCES = \
+	src/test/test-siphash24.c
+
+test_siphash24_LDADD = \
+	libshared.la
+
 test_strxcpyx_SOURCES = \
 	src/test/test-strxcpyx.c
 

src/test/test-siphash24.c

@@ -0,0 +1,47 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+  This file is part of systemd.
+
+  Copyright 2015 Tom Gundersen
+
+  systemd is free software; you can redistribute it and/or modify it
+  under the terms of the GNU Lesser General Public License as published by
+  the Free Software Foundation; either version 2.1 of the License, or
+  (at your option) any later version.
+
+  systemd is distributed in the hope that it will be useful, but
+  WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public License
+  along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include "util.h"
+#include "siphash24.h"
+
+#define ITERATIONS 10000000ULL
+
+/* see https://131002.net/siphash/siphash.pdf, Appendix A */
+int main(int argc, char *argv[]) {
+        const uint8_t in[15]  = { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
+                                  0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e };
+        const uint8_t key[16] = { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
+                                  0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f};
+        uint64_t out = 0;
+        unsigned k;
+        usec_t ts;
+
+        siphash24((uint8_t *)&out, in, sizeof(in), key);
+
+        assert_se(out == 0xa129ca6149be45e5ULL);
+
+        ts = now(CLOCK_MONOTONIC);
+        for (k = 0; k < ITERATIONS; k++)
+                siphash24((uint8_t *)&out, in, sizeof(in), key);
+        ts = now(CLOCK_MONOTONIC) - ts;
+
+        log_info("%llu iterations per second", (ITERATIONS * USEC_PER_SEC) / ts);
+}