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/auth5.c

@@ -0,0 +1,41 @@
+
+#define TEST_NAME "auth5"
+#include "cmptest.h"
+
+static unsigned char key[32];
+static unsigned char c[1000];
+static unsigned char a[32];
+
+int
+main(void)
+{
+    size_t clen;
+
+    for (clen = 0; clen < 1000; ++clen) {
+        crypto_auth_keygen(key);
+        randombytes_buf(c, clen);
+        crypto_auth(a, c, clen, key);
+        if (crypto_auth_verify(a, c, clen, key) != 0) {
+            printf("fail %u\n", (unsigned int) clen);
+            return 100;
+        }
+        if (clen > 0) {
+            c[rand() % clen] += 1 + (rand() % 255);
+            if (crypto_auth_verify(a, c, clen, key) == 0) {
+                printf("forgery %u\n", (unsigned int) clen);
+                return 100;
+            }
+            a[rand() % sizeof a] += 1 + (rand() % 255);
+            if (crypto_auth_verify(a, c, clen, key) == 0) {
+                printf("forgery %u\n", (unsigned int) clen);
+                return 100;
+            }
+        }
+    }
+
+    crypto_auth_keygen(key);
+    crypto_auth(a, guard_page, 0U, key);
+    assert(crypto_auth_verify(a, guard_page, 0U, key) == 0);
+
+    return 0;
+}