<p><b>@miri64</b> commented on this pull request.</p>

<hr>

<p>In <a href="https://github.com/RIOT-OS/RIOT/pull/11936#discussion_r323722302">pkg/tinydtls/doc.txt</a>:</p>
<pre style='color:#555'>> +#define DTLS_HANDSHAKE_MAX  (2)
+#endif
+
+ /**
+ * @brief The maximum number of concurrently used cipher keys
+ */
+#ifndef DTLS_SECURITY_MAX
+#define DTLS_SECURITY_MAX   (DTLS_HANDSHAKE_MAX + DTLS_PEER_MAX)
+#endif
+
+ /**
+ * @brief The maximum number of hash functions that can be used in parallel
+ */
+#ifndef DTLS_HASH_MAX
+#define DTLS_HASH_MAX       (3 * DTLS_PEER_MAX)
+#endif
</pre>
<p>Ah.. since this is a <code>doc.txt</code> you can omit the <code>#defined DOXYGEN</code> ;-)</p>

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