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/core4.c

@@ -0,0 +1,36 @@
+
+#define TEST_NAME "core4"
+#include "cmptest.h"
+
+static unsigned char k[32] = { 1,   2,   3,   4,   5,   6,   7,   8,
+                               9,   10,  11,  12,  13,  14,  15,  16,
+                               201, 202, 203, 204, 205, 206, 207, 208,
+                               209, 210, 211, 212, 213, 214, 215, 216 };
+
+static unsigned char in[16] = { 101, 102, 103, 104, 105, 106, 107, 108,
+                                109, 110, 111, 112, 113, 114, 115, 116 };
+
+static unsigned char c[16] = { 101, 120, 112, 97,  110, 100, 32, 51,
+                               50,  45,  98,  121, 116, 101, 32, 107 };
+
+static unsigned char out[64];
+
+int
+main(void)
+{
+    int i;
+
+    crypto_core_salsa20(out, in, k, c);
+    for (i = 0; i < 64; ++i) {
+        if (i > 0) {
+            printf(",");
+        } else {
+            printf(" ");
+        }
+        printf("%3u", (unsigned int) out[i]);
+        if (i % 8 == 7) {
+            printf("\n");
+        }
+    }
+    return 0;
+}