s |
             |             |          +---------------------------+
             v             v
           RAND_bytes()   RAND_priv_bytes()
                |               ^
                |               |
+------------------+      +------------------------------------+
| general purpose  |      | used for secrets like session keys |
| random generator |      | and private keys for certificates  |
+------------------+      +------------------------------------+</code></pre>

<p>The usual way to obtai