Adding the rest of files:

- ASM is disabled
- Neug needs full rewrite
- Flash is based on PiMoroni 4MB flash (needs adjust)

Signed-off-by: Pol Henarejos <pol.henarejos@cttc.es>

random.h

@@ -0,0 +1,12 @@
+void random_init (void);
+void random_fini (void);
+
+/* 32-byte random bytes */
+const uint8_t *random_bytes_get (void);
+void random_bytes_free (const uint8_t *p);
+
+/* 8-byte salt */
+void random_get_salt (uint8_t *p);
+
+/* iterator returning a byta at a time */
+int random_gen (void *arg, unsigned char *output, size_t output_len);