Add reference implementation of siphash.

1 files changed, 75 insertions, 0 deletions

diff --git a/src/libcryptobox/siphash/siphash.c b/src/libcryptobox/siphash/siphash.c
new file mode 100644
index 000000000..de5a18eba
--- /dev/null
+++ b/src/libcryptobox/siphash/siphash.c
@@ -0,0 +1,75 @@
+/* Copyright (c) 2015, Vsevolod Stakhov
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *       * Redistributions of source code must retain the above copyright
+ *         notice, this list of conditions and the following disclaimer.
+ *       * Redistributions in binary form must reproduce the above copyright
+ *         notice, this list of conditions and the following disclaimer in the
+ *         documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED ''AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL AUTHOR BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "config.h"
+#include "cryptobox.h"
+#include "siphash.h"
+#include "platform_config.h"
+
+extern unsigned long cpu_config;
+
+typedef struct siphash_impl_t
+{
+	unsigned long cpu_flags;
+	const char *desc;
+
+	void (*siphash)(uint8_t *out, const uint8_t *in, uint64_t inlen, const uint8_t *k);
+} siphash_impl_t;
+
+#define SIPHASH_DECLARE(ext) \
+	void siphash_##ext(uint8_t *out, const uint8_t *in, uint64_t inlen, const uint8_t *k);
+
+#define SIPHASH_IMPL(cpuflags, desc, ext) \
+	{(cpuflags), desc, siphash_##ext}
+
+
+SIPHASH_DECLARE(ref)
+#define SIPHASH_GENERIC SIPHASH_IMPL(0, "generic", ref)
+
+/* list implemenations from most optimized to least, with generic as the last entry */
+static const siphash_impl_t siphash_list[] = {
+		SIPHASH_GENERIC,
+};
+
+static const siphash_impl_t *siphash_opt = &siphash_list[0];
+
+void
+siphash_load(void)
+{
+	guint i;
+
+	if (cpu_config != 0) {
+		for (i = 0; i < G_N_ELEMENTS(siphash_list); i++) {
+			if (siphash_list[i].cpu_flags & cpu_config) {
+				siphash_opt = &siphash_list[i];
+				break;
+			}
+		}
+	}
+}
+
+void siphash24 (unsigned char *out, const unsigned char *in,
+		unsigned long long inlen, const unsigned char *k)
+{
+	siphash_opt->siphash (out, in, inlen, k);
+}