more change for new ChibiOS/RT

src/random.h

@@ -0,0 +1,11 @@
+void random_init (void);
+
+/* 32-byte random bytes */
+const uint8_t *random_bytes_get (void);
+void random_bytes_free (const uint8_t *p);
+
+/* 4-byte salt */
+uint32_t get_salt (void);
+
+/* iterator returning a byta at a time */
+uint8_t random_byte (void *arg);