Add libsodium to build

src/3rdparty/sodium/crypto_auth.h

@@ -0,0 +1,44 @@
+#ifndef crypto_auth_H
+#define crypto_auth_H
+
+#include <stddef.h>
+
+#include "crypto_auth_hmacsha512256.h"
+#include "export.h"
+
+#ifdef __cplusplus
+# ifdef __GNUC__
+#  pragma GCC diagnostic ignored "-Wlong-long"
+# endif
+extern "C" {
+#endif
+
+#define crypto_auth_BYTES crypto_auth_hmacsha512256_BYTES
+SODIUM_EXPORT
+size_t  crypto_auth_bytes(void);
+
+#define crypto_auth_KEYBYTES crypto_auth_hmacsha512256_KEYBYTES
+SODIUM_EXPORT
+size_t  crypto_auth_keybytes(void);
+
+#define crypto_auth_PRIMITIVE "hmacsha512256"
+SODIUM_EXPORT
+const char *crypto_auth_primitive(void);
+
+SODIUM_EXPORT
+int crypto_auth(unsigned char *out, const unsigned char *in,
+                unsigned long long inlen, const unsigned char *k);
+
+SODIUM_EXPORT
+int crypto_auth_verify(const unsigned char *h, const unsigned char *in,
+                       unsigned long long inlen, const unsigned char *k)
+            __attribute__ ((warn_unused_result));
+
+SODIUM_EXPORT
+void crypto_auth_keygen(unsigned char k[crypto_auth_KEYBYTES]);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif