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/scalarmult2.c

@@ -0,0 +1,23 @@
+
+#define TEST_NAME "scalarmult2"
+#include "cmptest.h"
+
+static unsigned char bobsk[32] = { 0x5d, 0xab, 0x08, 0x7e, 0x62, 0x4a, 0x8a,
+                                   0x4b, 0x79, 0xe1, 0x7f, 0x8b, 0x83, 0x80,
+                                   0x0e, 0xe6, 0x6f, 0x3b, 0xb1, 0x29, 0x26,
+                                   0x18, 0xb6, 0xfd, 0x1c, 0x2f, 0x8b, 0x27,
+                                   0xff, 0x88, 0xe0, 0xeb };
+
+int
+main(void)
+{
+    unsigned char bobpk[32];
+    char          hex[65];
+    int           i;
+
+    crypto_scalarmult_base(bobpk, bobsk);
+    sodium_bin2hex(hex, sizeof hex, bobpk, sizeof bobpk);
+    printf("%s\n", hex);
+
+    return 0;
+}