Add libsodium to the tree and build what's needed from source.

git-svn-id: https://www.unprompted.com/svn/projects/tildefriends/trunk@3859 ed5197a5-7fde-0310-b194-c3ffbd925b24

deps/libsodium/test/default/auth6.c

@@ -0,0 +1,23 @@
+
+#define TEST_NAME "auth6"
+#include "cmptest.h"
+
+/* "Test Case 2" from RFC 4231 */
+static unsigned char key[32] = "Jefe";
+static unsigned char c[]     = "what do ya want for nothing?";
+
+static unsigned char a[64];
+
+int
+main(void)
+{
+    int i;
+
+    crypto_auth_hmacsha512(a, c, sizeof c - 1U, key);
+    for (i = 0; i < 64; ++i) {
+        printf(",0x%02x", (unsigned int) a[i]);
+        if (i % 8 == 7)
+            printf("\n");
+    }
+    return 0;
+}