1 files changed, 53 insertions, 0 deletions
diff --git a/src/basic/siphash24.h b/src/basic/siphash24.h
new file mode 100644
index 0000000..0b3e845
--- /dev/null
+++ b/src/basic/siphash24.h
@@ -0,0 +1,53 @@
+/* SPDX-License-Identifier: CC0-1.0 */
+
+#pragma once
+
+#include <inttypes.h>
+#include <stddef.h>
+#include <stdint.h>
+#include <sys/types.h>
+
+#include "string-util.h"
+#include "time-util.h"
+
+struct siphash {
+        uint64_t v0;
+        uint64_t v1;
+        uint64_t v2;
+        uint64_t v3;
+        uint64_t padding;
+        size_t inlen;
+};
+
+void siphash24_init(struct siphash *state, const uint8_t k[static 16]);
+void siphash24_compress(const void *in, size_t inlen, struct siphash *state);
+#define siphash24_compress_byte(byte, state) siphash24_compress((const uint8_t[]) { (byte) }, 1, (state))
+
+static inline void siphash24_compress_boolean(bool in, struct siphash *state) {
+        uint8_t i = in;
+
+        siphash24_compress(&i, sizeof i, state);
+}
+
+static inline void siphash24_compress_usec_t(usec_t in, struct siphash *state) {
+        siphash24_compress(&in, sizeof in, state);
+}
+
+static inline void siphash24_compress_safe(const void *in, size_t inlen, struct siphash *state) {
+        if (inlen == 0)
+                return;
+
+        siphash24_compress(in, inlen, state);
+}
+
+static inline void siphash24_compress_string(const char *in, struct siphash *state) {
+        siphash24_compress_safe(in, strlen_ptr(in), state);
+}
+
+uint64_t siphash24_finalize(struct siphash *state);
+
+uint64_t siphash24(const void *in, size_t inlen, const uint8_t k[static 16]);
+
+static inline uint64_t siphash24_string(const char *s, const uint8_t k[static 16]) {
+        return siphash24(s, strlen(s) + 1, k);
+}