 Core implementation</pre>
<pre style="margin:0; padding:0 ">   6: </pre>
<pre style="margin:0; padding:0 ">   7: module hmac_core import hmac_pkg::*; (</pre>
<pre style="background-color: #C0C0C0; margin:0; padding:0 ">   8:   input clk_i,</pre>
<pre style="background-color: #C0C0C0; margin:0; padding:0 ">   9:   input rst_ni,</pre>
<pre style="margin:0; padding:0 ">  10: </pre>
<pre style="background-color: #C0C0C0; margin:0; padding:0 ">  11:   input [255:0] secret_key, // {word0, word1, ..., word7}</pre